Hey guys I have a 1987 IROC Z 305 TPI G92 package with edelbrock shorty headers and a 3 inch exhaust. Has new plugs, wires, cap, rotor, rebuilt trans (t-5) and a new performance Ram clutch. Just over 81,000 original miles on body and engine.... Car runs GREAT... except when it's cold. Had no problems but now that the temps are dropping here in Chicago (50 degrees overnight) the car runs like absolute crap until it's warm. I am already replacing the alternator and belt because it loses power if I have too many electronics running; I get the same loss of power/runs like crap when it's cold. Are these issues related or do I just have to let my baby warm up in the morning a little longer?
Id suggest pulling trouble codes and look for a vacuum leak, that symptom is commonly the result of an overly LEAN fuel/air ratio while the engines cold, thats one reason cars with carburetors used chokes too get started, a richer mix tends to burn and and better when the engines cold, once it warms to operational temps fuel vapor forms far faster, fuel atomized better.
Id also check your injectors electrical resistance with a multi meter, and replace the fuel filter, verify the TPS and IAC are set correctly, and verify your getting a consistent 38 psi or higher at the fuel rail,and throw in a can of injector cleaner in a tank of fresh high test fuel
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Id suggest pulling trouble codes and look for a vacuum leak, that symptom is commonly the result of an overly LEAN fuel/air ratio while the engines cold, thats one reason cars with carburetors used chokes too get started, a richer mix tends to burn and and better when the engines cold, once it warms to operational temps fuel vapor forms far faster, fuel atomized better.
Id also check your injectors electrical resistance with a multi meter, and replace the fuel filter, verify the TPS and IAC are set correctly, and verify your getting a consistent 38 psi or higher at the fuel rail,and throw in a can of injector cleaner in a tank of fresh high test fuel
RELATED INFO
viewtopic.php?f=55&t=109
viewtopic.php?f=55&t=1241
viewtopic.php?f=55&t=606
viewtopic.php?f=55&t=350
viewtopic.php?f=32&t=168
viewtopic.php?f=32&t=6550&p=20807&hilit=propane+leaks#p20807
http://www.youtube.com/watch?v=zMok2y05 ... re=related