Idle Issues: hanging at 12-1400
02-25-2010, 08:27 PM
#41
I have this issue with my car now after the fast 92, 42lbs injectors, and I also have a tv.2 cam
I do have a tuner, he set the car up at summer time and all seemed well but once the winter came on it started bumping from 700 to 1400 back and forth, somtimes hanging at 1400.
not vacuum leaks. I do not have any tuning software myself but trying to mess with it I;
1.)waited till the car was idling at the desired 850rpm, unplugged IAC motor, still bounced when revved..
2.) I Gave it a vacuum leak, unplugged the pcv hose that pulls vacuum, Its idled smoothly at 900rpms with the IAC plugged it.
I need to go back to my tuner and have him mess with it more in the winter weather to perfect it. But I'm thinking the 42lbs injecters are in a richer tune still with cooler temps???
I do have a tuner, he set the car up at summer time and all seemed well but once the winter came on it started bumping from 700 to 1400 back and forth, somtimes hanging at 1400.
not vacuum leaks. I do not have any tuning software myself but trying to mess with it I;
1.)waited till the car was idling at the desired 850rpm, unplugged IAC motor, still bounced when revved..
2.) I Gave it a vacuum leak, unplugged the pcv hose that pulls vacuum, Its idled smoothly at 900rpms with the IAC plugged it.
I need to go back to my tuner and have him mess with it more in the winter weather to perfect it. But I'm thinking the 42lbs injecters are in a richer tune still with cooler temps???
02-25-2010, 09:02 PM
#42
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how do i get more slack (i think this may be part of the problem)? i can close the tb ever so slightly if i give a bit of a push on the cam in the right direction.
02-25-2010, 09:04 PM
#43
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I have this issue with my car now after the fast 92, 42lbs injectors, and I also have a tv.2 cam
I do have a tuner, he set the car up at summer time and all seemed well but once the winter came on it started bumping from 700 to 1400 back and forth, somtimes hanging at 1400.
not vacuum leaks. I do not have any tuning software myself but trying to mess with it I;
1.)waited till the car was idling at the desired 850rpm, unplugged IAC motor, still bounced when revved..
2.) I Gave it a vacuum leak, unplugged the pcv hose that pulls vacuum, Its idled smoothly at 900rpms with the IAC plugged it.
I need to go back to my tuner and have him mess with it more in the winter weather to perfect it. But I'm thinking the 42lbs injecters are in a richer tune still with cooler temps???
I do have a tuner, he set the car up at summer time and all seemed well but once the winter came on it started bumping from 700 to 1400 back and forth, somtimes hanging at 1400.
not vacuum leaks. I do not have any tuning software myself but trying to mess with it I;
1.)waited till the car was idling at the desired 850rpm, unplugged IAC motor, still bounced when revved..
2.) I Gave it a vacuum leak, unplugged the pcv hose that pulls vacuum, Its idled smoothly at 900rpms with the IAC plugged it.
I need to go back to my tuner and have him mess with it more in the winter weather to perfect it. But I'm thinking the 42lbs injecters are in a richer tune still with cooler temps???
like theyve been saying in here, timing and airflow. too high timing will make it surge, too much airflow with a 0 iac count = what i have.
02-25-2010, 09:36 PM
#48
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Mine is doing the exact same thing as the op's, and I just installed a FAST 90/NW 90 TB. Mine isn't as drastic as his but mine starts at 750 rpms cold then bumps up to 950 once the engine is warm (the IAC counts fluctuate from 0-7) once warm. What should I look into first? I retorqued the manifold bolts today and checked all the pcv/vacuum lines. There were a couple manifold bolts that were slightly loose but now they are all tight...
02-25-2010, 11:20 PM
#49
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Could your iac motor be wired backwards, i believe i did this once only because i had to wire mine. Did you use new gaskets when you put the intake on. Check fitment of tb blade to bore of tb. I had to add more spring to my tb because it wouldnt pull it shut, though i run a much different tb.
