91 5.7L Z28 Problems
#1
91 5.7L Z28 Problems
Hey,
Just bought a 91 5.7L camaro z28, automatic. The motor has been rebuilt with a higher than stock lift on the cam and the motor has been bored .030 over and besides that everything is stock, except exhaust, k&n's, airfoil. Since i've had it I had some high idle and inconsistant idle.(Idles around 1100 then jumps to 1400-1600 making the car jump at stops and sometimes jumps way down and cuts off) I took it to my mechanic and he went over it bottom to top with his decision being that the problem was in the chip and recommended I got a custom one for that cam specs. Other than the idle it runs great.
Would the wrong or stock chip make the car idle high and inconsistant?
If I do get a chip should I go with a custom chip for the specs of the cam or just a aftermarket stage 2 chip from hypertech? If I get a custom chip, I do plan on adding bigger injectors, 52mm TB, and swapping intake/runners eventually. Would I have to get another custom chip made for those mods as well?
Thank you for any information,
Andrew
Just bought a 91 5.7L camaro z28, automatic. The motor has been rebuilt with a higher than stock lift on the cam and the motor has been bored .030 over and besides that everything is stock, except exhaust, k&n's, airfoil. Since i've had it I had some high idle and inconsistant idle.(Idles around 1100 then jumps to 1400-1600 making the car jump at stops and sometimes jumps way down and cuts off) I took it to my mechanic and he went over it bottom to top with his decision being that the problem was in the chip and recommended I got a custom one for that cam specs. Other than the idle it runs great.
Would the wrong or stock chip make the car idle high and inconsistant?
If I do get a chip should I go with a custom chip for the specs of the cam or just a aftermarket stage 2 chip from hypertech? If I get a custom chip, I do plan on adding bigger injectors, 52mm TB, and swapping intake/runners eventually. Would I have to get another custom chip made for those mods as well?
Thank you for any information,
Andrew
#2
Supreme Member
Joined: Jul 2003
Posts: 1,236
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From: KY
Car: 87IROC, 740iBMW, 328iBMW, 86GMC
Engine: 5.7, 4.4LV8, 2.8, 6.0
Transmission: Manuals & Auto's
Axle/Gears: 3.27, 3.42
Re: 91 5.7L Z28 Problems
Depending on the specs of the cam, the less forgiving speed density system / computer (chip) may not cooperate and cause run issues.
Contact the folks at http://www.pcmforless.com (they also build chips) and check into a custom chip that will match your cam profile.
Contact the folks at http://www.pcmforless.com (they also build chips) and check into a custom chip that will match your cam profile.
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