2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Idle issue

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Old Apr 4, 2007 | 10:32 AM
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Idle issue

fc3svert issue.....Idle is ok until I get in the high RPM range (5/6 port opening range)...once it is driven kind of hard for a period of time the idle drops and lobes like I have a racing cam or something...any ideas?
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Old Apr 4, 2007 | 11:17 AM
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Try setting the idle and TPS first as per the FSM. If it still occurs probably bad BAC.

If it drops when stopping at a light then slowly goes back up most likely BAC. Also check it without lights\accessories on and off.
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Old Apr 4, 2007 | 12:23 PM
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lights and accesories make no difference...were you thinking electrical possibly?
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Old Apr 4, 2007 | 12:45 PM
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Originally Posted by pmr2000
Try setting the idle and TPS first as per the FSM. If it still occurs probably bad BAC.

If it drops when stopping at a light then slowly goes back up most likely BAC. Also check it without lights\accessories on and off.
I'll second this. And dont skip the part where it tells you to use the ground-spade-plug thingy!!! Most people skip this, and cant figure out why they cant tune their idle...
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Old Apr 4, 2007 | 01:27 PM
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Originally Posted by onlyrotary1989
lights and accesories make no difference...were you thinking electrical possibly?
Marginal BAC usually reacts more quickly without any electrical load.
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Old Apr 4, 2007 | 02:14 PM
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Great...thanks guys...ill give it a shot...appreciate the help
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Old Apr 6, 2007 | 02:15 PM
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oops...forgot to mention this and it could be a big deal...but after running for a little while I also have a tough time restarting...could it be a engine integrity issuse and my seals are bad? or could this also be a result of a bad BAC? please say BAC please say BAC...would rather not have to rebuild engine.
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Old Apr 6, 2007 | 03:00 PM
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Originally Posted by onlyrotary1989
oops...forgot to mention this and it could be a big deal...but after running for a little while I also have a tough time restarting...could it be a engine integrity issuse and my seals are bad? or could this also be a result of a bad BAC? please say BAC please say BAC...would rather not have to rebuild engine.
Hard starting of a warm engine can be a symptom of poor engine compression or injector(s) dumping fuel into the engine after it is shut off. Check the engine compression before you do anything else. This is not a BAC issue.
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