94 LT1 missing at idle
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Joined: Sep 2007
Posts: 99
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From: Louisville Kentucky
94 LT1 missing at idle
I am having a problem with my 94 vette lt1 6 speed, at idle the tach will start to jump from 900 rpms to around 1200 rpms. It seems to be after it has been driven for a while, cold it runs great. I ohmed the injectors and the reading was 12.7 to 12.8 also replaced spark plugs. Plug wires are new AC delco. The check engine light does not come on. After it does this I will open it up and some times it will miss and some times it will not. There is no loss of antifreeze nor is the water pump leaking. Any suggestion to solving my problem would be helpful
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Joined: Aug 2006
Posts: 140
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From: St. Louis MO
My 94 LT1 6-speed had exactly the same symptoms.
Fixed the idle problem by replacing the injectors with Bosch III's from FIC - but if your injectors are okay (don't know if those ohm readings are okay, but they're certainly consistent) your idle issue is obviously something else. I also don't know enough about injectors to know if they can stick even though the ohm readings are okay. Mine smoothed out completely - those Bosch's are amazing, and the replacement was an easy Saturday afternoon project.
I still have an occasional stumble when the engine is really hot, like after waiting at a stoplight during a long drive on a hot afternoon. When cool it's running great. Haven't checked for codes yet, will do that this weekend.
Anxious to see what solutions get suggested.
Fixed the idle problem by replacing the injectors with Bosch III's from FIC - but if your injectors are okay (don't know if those ohm readings are okay, but they're certainly consistent) your idle issue is obviously something else. I also don't know enough about injectors to know if they can stick even though the ohm readings are okay. Mine smoothed out completely - those Bosch's are amazing, and the replacement was an easy Saturday afternoon project.
I still have an occasional stumble when the engine is really hot, like after waiting at a stoplight during a long drive on a hot afternoon. When cool it's running great. Haven't checked for codes yet, will do that this weekend.
Anxious to see what solutions get suggested.
Thread Starter
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Joined: Sep 2007
Posts: 99
Likes: 0
From: Louisville Kentucky
I am having a problem with my 94 vette lt1 6 speed, at idle the tach will start to jump from 900 rpms to around 1200 rpms. It seems to be after it has been driven for a while, cold it runs great. I ohmed the injectors and the reading was 12.7 to 12.8 also replaced spark plugs. Plug wires are new AC delco. The check engine light does not come on. After it does this I will open it up and some times it will miss and some times it will not. There is no loss of antifreeze nor is the water pump leaking. Any suggestion to solving my problem would be helpful
