Ignition timing/cam timing and idle problems
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ever since ive been screwing with my timing my car has been idling really rough sometimes barely holding on. my vacuum is normally about 18-20 at idle and is now around 15 for some reason with a normal rpm idle(700-800). my timing is at 10-11 degrees right now. i also screwed with my cam timing.the intake cam is advance 1 and the exhaust is retarded 3. could either of these effect my idle that bad? thanks for any help
lifelong learner
Joined: Jul 2000
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you are increaseing your valve overlap mang
if you make the intake open earlier
and the exhaust open later
that means
the exhaust will stay open alter and the intake will open sooner and there will be even more increased overlap
if you make the intake open earlier
and the exhaust open later
that means
the exhaust will stay open alter and the intake will open sooner and there will be even more increased overlap
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rest in peace tim.
Advocate for the People's Republic of Awesome
rest in peace tim.
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yes it can 100% efect the idle speed.Normally at idle the ECU will run in closed loop and will want to keep the cars a/f at 14.7 when you retard the timing like that it makes the iacv work harder and produce your rough idle. basiclly take it to john and hae him tune it.
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Originally posted by "Someone"
Originally posted by 99B16Si
ever since ive been screwing with my timing my car has been idling really rough sometimes barely holding on. my vacuum is normally about 18-20 at idle and is now around 15 for some reason with a normal rpm idle(700-800). my timing is at 10-11 degrees right now. i also screwed with my cam timing.the intake cam is advance 1 and the exhaust is retarded 3. could either of these effect my idle that bad? thanks for any help
Originally posted by 99B16Si
ever since ive been screwing with my timing my car has been idling really rough sometimes barely holding on. my vacuum is normally about 18-20 at idle and is now around 15 for some reason with a normal rpm idle(700-800). my timing is at 10-11 degrees right now. i also screwed with my cam timing.the intake cam is advance 1 and the exhaust is retarded 3. could either of these effect my idle that bad? thanks for any help
