Bad ignition timing#

adapted from Wikipedia

General#


Ignition timing is the process of setting the time that a spark will occur in the combustion chamber (during the power stroke) relative to piston position and crankshaft angular velocity.

Setting the correct ignition timing is crucial in the performance of an engine. The ignition timing affects many variables including engine longevity, fuel economy, and engine power.

Typical Symptoms#


Bad ignition timing can have multiple symptoms: For example, some starting problems are related to bad ignition timing. So a bad ignition timing can results in a barely or not starting engine. Additionally, bad ignition timing can be the reason for performance problems such as delayed take-off or weak acceleration. Furthermore, bad ignition timing frequently causes engine noises such as ringing or knocking.

Repair Instructions#


Setting the ignition timing while monitoring engine power output with a dynamometer is one way to correctly set the ignition timing. After advancing or retarding the timing, a corresponding change in power output will usually occur. A load type dynamometer is the best way to accomplish this as the engine can be held at a steady speed and load while the timing is adjusted for maximum output.

Please note that newer engines typically use electronic ignition systems (ignition controlled by a computer). Most computers from original equipment manufacturers (OEM) are not able to be modified so changing the timing is not possible.

Overall timing changes are still possible, depending on the engine design. Aftermarket engine control units allow to make changes to the timing map. This allows the timing to be advanced or retarded based on various engine applications.

IF NOT ((Engine start = does not start OR Engine start = engine barely starts)) THEN Bad ignition timing = N5
IF (Engine noises = ringing OR Engine noises = knocking) THEN Bad ignition timing = P5
IF NOT ((Engine noises = ringing OR Engine noises = knocking)) THEN Bad ignition timing = N3
IF ((Engine start = does not start OR Engine start = engine barely starts) AND Starter = turns over) THEN Bad ignition timing = P5
IF NOT (Driving = "delayed take-off" OR Driving = unsteady idle speed OR Driving = weak acceleration) THEN Bad ignition timing = N4
IF Driving = unsteady idle speed THEN Bad ignition timing = P1
IF Driving = "delayed take-off" THEN Bad ignition timing = P3
IF Driving = weak acceleration THEN Bad ignition timing = P4
IF NOT (Starter = turns over) THEN Bad ignition timing = N6
IF "Check: Ignition timing." = ok THEN Bad ignition timing = N7
IF "Check: Ignition timing." = not ok THEN Bad ignition timing = P7
demo

Bad ignition timing.link = /Wiki.jsp?page=Demo - BadIgnitionTiming demo

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!!! Bad ignition timing adapted from Wikipedia

General#

---- Ignition timing is the process of setting the time that a spark will occur in the combustion chamber (during the power stroke) relative to piston position and crankshaft angular velocity. Setting the correct ignition timing is crucial in the performance of an engine. The ignition timing affects many variables including engine longevity, fuel economy, and engine power.

Typical Symptoms#

---- Bad ignition timing can have multiple symptoms: For example, some starting problems are related to bad ignition timing. So a bad ignition timing can results in a barely or not starting engine. Additionally, bad ignition timing can be the reason for performance problems such as delayed take-off or weak acceleration. Furthermore, bad ignition timing frequently causes engine noises such as ringing or knocking.

Repair Instructions#

---- Setting the ignition timing while monitoring engine power output with a dynamometer is one way to correctly set the ignition timing. After advancing or retarding the timing, a corresponding change in power output will usually occur. A load type dynamometer is the best way to accomplish this as the engine can be held at a steady speed and load while the timing is adjusted for maximum output. Please note that newer engines typically use electronic ignition systems (ignition controlled by a computer). Most computers from original equipment manufacturers (OEM) are not able to be modified so changing the timing is not possible. Overall timing changes are still possible, depending on the engine design. Aftermarket engine control units allow to make changes to the timing map. This allows the timing to be advanced or retarded based on various engine applications. %%Rule IF NOT ((Engine start = does not start OR Engine start = engine barely starts)) THEN Bad ignition timing = N5 IF (Engine noises = ringing OR Engine noises = knocking) THEN Bad ignition timing = P5 IF NOT ((Engine noises = ringing OR Engine noises = knocking)) THEN Bad ignition timing = N3 IF ((Engine start = does not start OR Engine start = engine barely starts) AND Starter = turns over) THEN Bad ignition timing = P5 IF NOT (Driving = "delayed take-off" OR Driving = unsteady idle speed OR Driving = weak acceleration) THEN Bad ignition timing = N4 IF Driving = unsteady idle speed THEN Bad ignition timing = P1 IF Driving = "delayed take-off" THEN Bad ignition timing = P3 IF Driving = weak acceleration THEN Bad ignition timing = P4 IF NOT (Starter = turns over) THEN Bad ignition timing = N6 IF "Check: Ignition timing." = ok THEN Bad ignition timing = N7 IF "Check: Ignition timing." = not ok THEN Bad ignition timing = P7 @package: demo % %%property Bad ignition timing.link = /Wiki.jsp?page=Demo - BadIgnitionTiming @package: demo % %%renderKDOM % %%tags Demo % ​
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!!! Bad ignition timing ​
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!!! Bad ignition timing ​
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adapted from Wikipedia
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adapted from Wikipedia
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!! General ​
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!! General ​
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----
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----
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Ignition timing is the process of setting the time that a spark will occur in the combustion chamber (during the power stroke) relative to piston position and crankshaft angular velocity.
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Ignition timing is the process of setting the time that a spark will occur in the combustion chamber (during the power stroke) relative to piston position and crankshaft angular velocity.
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Setting the correct ignition timing is crucial in the performance of an engine. The ignition timing affects many variables including engine longevity, fuel economy, and engine power.
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Setting the correct ignition timing is crucial in the performance of an engine. The ignition timing affects many variables including engine longevity, fuel economy, and engine power.
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!! Typical Symptoms ​
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!! Typical Symptoms ​
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----
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----
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Bad ignition timing can have multiple symptoms: For example, some starting problems are related to bad ignition timing. So a bad ignition timing can results in a barely or not starting engine. Additionally, bad ignition timing can be the reason for performance problems such as delayed take-off or weak acceleration. Furthermore, bad ignition timing frequently causes engine noises such as ringing or knocking.
WikiTextType93012f0b42000
Bad ignition timing can have multiple symptoms: For example, some starting problems are related to bad ignition timing. So a bad ignition timing can results in a barely or not starting engine. Additionally, bad ignition timing can be the reason for performance problems such as delayed take-off or weak acceleration. Furthermore, bad ignition timing frequently causes engine noises such as ringing or knocking.
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!! Repair Instructions ​
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!! Repair Instructions ​
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----
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----
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Setting the ignition timing while monitoring engine power output with a dynamometer is one way to correctly set the ignition timing. After advancing or retarding the timing, a corresponding change in power output will usually occur. A load type dynamometer is the best way to accomplish this as the engine can be held at a steady speed and load while the timing is adjusted for maximum output.
WikiTextType92661bfe39700
Setting the ignition timing while monitoring engine power output with a dynamometer is one way to correctly set the ignition timing. After advancing or retarding the timing, a corresponding change in power output will usually occur. A load type dynamometer is the best way to accomplish this as the engine can be held at a steady speed and load while the timing is adjusted for maximum output.
ParagraphType16ba4c5a24113391
Please note that newer engines typically use electronic ignition systems (ignition controlled by a computer). Most computers from original equipment manufacturers (OEM) are not able to be modified so changing the timing is not possible.
WikiTextType2efd7e9a24100
Please note that newer engines typically use electronic ignition systems (ignition controlled by a computer). Most computers from original equipment manufacturers (OEM) are not able to be modified so changing the timing is not possible.
ParagraphType165f01d724015801
Overall timing changes are still possible, depending on the engine design. Aftermarket engine control units allow to make changes to the timing map. This allows the timing to be advanced or retarded based on various engine applications.
WikiTextType613962f924000
Overall timing changes are still possible, depending on the engine design. Aftermarket engine control units allow to make changes to the timing map. This allows the timing to be advanced or retarded based on various engine applications.
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%%Rule IF NOT ((Engine start = does not start OR Engine start = engine barely starts)) THEN Bad ignition timing = N5 IF (Engine noises = ringing OR Engine noises = knocking) THEN Bad ignition timing = P5 IF NOT ((Engine noises = ringing OR Engine noises = knocking)) THEN Bad ignition timing = N3 IF ((Engine start = does not start OR Engine start = engine barely starts) AND Starter = turns over) THEN Bad ignition timing = P5 IF NOT (Driving = "delayed take-off" OR Driving = unsteady idle speed OR Driving = weak acceleration) THEN Bad ignition timing = N4 IF Driving = unsteady idle speed THEN Bad ignition timing = P1 IF Driving = "delayed take-off" THEN Bad ignition timing = P3 IF Driving = weak acceleration THEN Bad ignition timing = P4 IF NOT (Starter = turns over) THEN Bad ignition timing = N6 IF "Check: Ignition timing." = ok THEN Bad ignition timing = N7 IF "Check: Ignition timing." = not ok THEN Bad ignition timing = P7 @package: demo % ​
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%%Rule ​
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IF NOT ((Engine start = does not start OR Engine start = engine barely starts)) THEN Bad ignition timing = N5 IF (Engine noises = ringing OR Engine noises = knocking) THEN Bad ignition timing = P5 IF NOT ((Engine noises = ringing OR Engine noises = knocking)) THEN Bad ignition timing = N3 IF ((Engine start = does not start OR Engine start = engine barely starts) AND Starter = turns over) THEN Bad ignition timing = P5 IF NOT (Driving = "delayed take-off" OR Driving = unsteady idle speed OR Driving = weak acceleration) THEN Bad ignition timing = N4 IF Driving = unsteady idle speed THEN Bad ignition timing = P1 IF Driving = "delayed take-off" THEN Bad ignition timing = P3 IF Driving = weak acceleration THEN Bad ignition timing = P4 IF NOT (Starter = turns over) THEN Bad ignition timing = N6 IF "Check: Ignition timing." = ok THEN Bad ignition timing = N7 IF "Check: Ignition timing." = not ok THEN Bad ignition timing = P7 ​
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Bad ignition timing = N4​
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Bad ignition timing = N4​
SolutionReferenced398fbbe1900
Bad ignition timing​
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=​
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ScorePoint83eb03862220
N4​
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RuleTypedc6b810c655853
IF Driving = unsteady idle speed THEN Bad ignition timing = P1​
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IF Driving = unsteady idle speed​
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IF​
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IF​
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Driving = unsteady idle speed​
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Driving = unsteady idle speed​
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Driving = unsteady idle speed​
QuestionReference675551d2700
Driving​
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AnonymousTypee20f022a180
=​
PlainTexte20f05ce190
FindingAnswerReferenceadbdc7ff19100
unsteady idle speed​
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THEN Bad ignition timing = P1​
RuleTokenTypef7bf392a401
THEN​
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THEN​
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Bad ignition timing = P1​
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Bad ignition timing = P1​
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Bad ignition timing = P1​
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Bad ignition timing​
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=​
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P1​
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IF Driving = "delayed take-off" THEN Bad ignition timing = P3​
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IF Driving = "delayed take-off"​
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IF​
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IF​
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Driving = "delayed take-off"​
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Driving = "delayed take-off"​
Findinge3020a9c2805
Driving = "delayed take-off"​
QuestionReference5f586f90700
Driving​
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AnonymousType6b32c668180
=​
PlainText6b32ca0c190
FindingAnswerReferenceafb716ec18100
"delayed take-off"​
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THEN Bad ignition timing = P3​
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THEN​
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THEN​
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Bad ignition timing = P3​
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Bad ignition timing = P3​
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Bad ignition timing = P3​
SolutionReferencec51e732f1900
Bad ignition timing​
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=​
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ScorePointc41118322220
P3​
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IF Driving = weak acceleration THEN Bad ignition timing = P4​
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IF Driving = weak acceleration​
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IF​
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IF​
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Driving = weak acceleration​
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Driving = weak acceleration​
Finding3e7f68272705
Driving = weak acceleration​
QuestionReference575b8d4e700
Driving​
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AnonymousTypef4568aa6180
=​
PlainTextf4568e4a190
FindingAnswerReference7ccec41317100
weak acceleration​
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THEN Bad ignition timing = P4​
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THEN​
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THEN​
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Bad ignition timing = P4​
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Bad ignition timing = P4​
SolutionValueAssignmentb36c594e2405
Bad ignition timing = P4​
SolutionReferencead9ce3ed1900
Bad ignition timing​
PlainText34a024ec1190
Equals34a028ca1200
=​
PlainText34a02c6e1210
ScorePoint5f65dbb52220
P4​
PlainText6d96512047850
RuleTypeeee2f1c9637893
IF NOT (Starter = turns over) THEN Bad ignition timing = N6​
IfConditionContainercad86ba63103
IF NOT (Starter = turns over)​
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IF​
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IF​
PlainTextdeef61bc320
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NOT (Starter = turns over)​
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NOT (Starter = turns over)​
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NOT​
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(Starter = turns over)​
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(Starter = turns over)​
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(​
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Starter = turns over​
CompositeConditiond1560c302001
Starter = turns over​
TerminalCondition4a221e122001
Starter = turns over​
Finding95f728f02005
Starter = turns over​
QuestionReference8d18c20f700
Starter​
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AnonymousType88cca95f180
=​
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FindingAnswerReferenced17bb2fa10100
turns over​
PlainText1e82dc0a1210
)​
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ThenActionContainerfb033c3529342
THEN Bad ignition timing = N6​
RuleTokenType25e91964401
THEN​
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THEN​
SingleActionbb8a52232542
Bad ignition timing = N6​
PlainText24d377a8100
RuleAction814cb4c02411
Bad ignition timing = N6​
SolutionValueAssignment761192502405
Bad ignition timing = N6​
SolutionReference961b54ab1900
Bad ignition timing​
PlainTextbdc3e92a1190
Equalsbdc3ed081200
=​
PlainTextbdc3f0ac1210
ScorePointfaba9efb2220
N6​
PlainText7100025e48520
RuleTypef39ab1f6668563
IF "Check: Ignition timing." = ok THEN Bad ignition timing = N7​
IfConditionContainer3d95f9e23503
IF "Check: Ignition timing." = ok​
RuleTokenType6ba26de0201
IF​
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IF​
PlainText8b8c73e320
CompositeCondition1fc56bdb3051
"Check: Ignition timing." = ok​
TerminalConditionaa86bd73001
"Check: Ignition timing." = ok​
Finding10e39a5b3005
"Check: Ignition timing." = ok​
QuestionReference244c04682500
"Check: Ignition timing."​
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=​
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FindingAnswerReferencecd2540552280
ok​
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THEN Bad ignition timing = N7​
RuleTokenType354c6422401
THEN​
PlainText9c3ca716400
THEN​
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Bad ignition timing = N7​
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Bad ignition timing = N7​
SolutionValueAssignment38b6cb8f2405
Bad ignition timing = N7​
SolutionReference7e99c5691900
Bad ignition timing​
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=​
PlainText46e7b4ea1210
ScorePoint960f627e2220
N7​
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IF "Check: Ignition timing." = not ok THEN Bad ignition timing = P7​
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IF "Check: Ignition timing." = not ok​
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IF​
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IF​
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"Check: Ignition timing." = not ok​
TerminalCondition497ae85b3401
"Check: Ignition timing." = not ok​
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"Check: Ignition timing." = not ok​
QuestionReferencece63ca312500
"Check: Ignition timing."​
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=​
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not ok​
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THEN Bad ignition timing = P7​
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THEN​
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THEN​
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Bad ignition timing = P7​
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Bad ignition timing = P7​
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Bad ignition timing = P7​
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Bad ignition timing​
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P7​
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This page (revision-5) was last changed on 11-Jun-2019 13:50 by Jochen Reutelshöfer