TPI will not hold idle
09-04-2016, 05:57 PM
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Car: 1991 Z28
Engine: 350
Transmission: 700R4
TPI will not hold idle
91z28 super ram 355 with cam and headers. Will not hold idle. I even have to give it a little trottle to start and restart after it dies. I reset the iac and has a new iac and tps. Any ideas of what to do ?
09-06-2016, 01:12 AM
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Car: 1991 Z28
Engine: 350
Transmission: 700R4
Re: TPI will not hold idle
Went ahead and reset it again. Still doesn't want to idle and dies when I put it in gear
09-06-2016, 02:30 PM
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Car: 87 GTA, 88 GTA, 92 TA, 72 RS SS
Engine: 350, 350, 305, 396
Transmission: T56, 700r4, 700r4, T56
Axle/Gears: 3.42, 3.23, 3.23, 3.73
Re: TPI will not hold idle
Verify that you do not have any vacuum leaks, super ram's are notorious for sealing issues..
10-13-2016, 04:28 AM
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Car: 1991 Z28
Engine: 350
Transmission: 700R4
Re: TPI will not hold idle
No vacuum leaks that I can find and still will only start if I give it a lot of gas from the pedal. Timing was reset and tps voltages and position match on the scanner. Idk what next ?
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10-23-2016, 12:17 AM
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Car: 1991 Z28
Engine: 350
Transmission: 700R4
Re: TPI will not hold idle
Nothing has been changed recently. Just been sitting because I cannot figure out the issue. Also dies when you put it in gear
10-23-2016, 06:24 PM
#9
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Car: 1991 Z28
Engine: 350
Transmission: 700R4
Re: TPI will not hold idle
I read in another post that the ecm requires a input when shifting into gear so it might be one of the problems. I do have a megashifter on my 700r4
10-25-2016, 09:01 PM
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Car: 1991 Z28
Engine: 350
Transmission: 700R4
Re: TPI will not hold idle
My tps is non adjustable so I can't move it. Fuel filter is pretty new and fuel pressure is good
10-29-2016, 04:59 AM
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Car: 1991 Z28
Engine: 350
Transmission: 700R4
Re: TPI will not hold idle
Well got desperate and swapped out the ecm but same issue. Redownloaded my bin file to my ostrich and still nothing. Going to try my factory memcal and prom tomarrow. Running out of ideas
11-02-2016, 04:16 AM
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Car: 1991 Z28
Engine: 350
Transmission: 700R4
Re: TPI will not hold idle
So just a recap. Stalls in when going into gear and will not start without laying into the throttle.
So far I have reset iac multiple times.
Reset timing.
Swapped in three different ecms
reuploaded my bin to my ostrich
swapped out tps twice.
Checked fuel pressure and flow
gotta be something stupid here
So far I have reset iac multiple times.
Reset timing.
Swapped in three different ecms
reuploaded my bin to my ostrich
swapped out tps twice.
Checked fuel pressure and flow
gotta be something stupid here
11-02-2016, 07:00 AM
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Car: 1988 IROC Camaro (RHD)
Engine: 350 ci L98 SBC
Transmission: T700
Axle/Gears: 9 bolt BW, Disk, Posi-traction
Re: TPI will not hold idle
Maybe get a smoke blower to test for leaks?
11-02-2016, 07:04 AM
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: TPI will not hold idle
Yup, sounds like you have a vac leak somewhere.
11-09-2016, 03:23 AM
#23
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Car: 1991 Z28
Engine: 350
Transmission: 700R4
Re: TPI will not hold idle
Picked up a smoke machine and I do have a leak at the rear passanger runner. Trying to decide if I even want to put the superram back on.
11-19-2016, 04:26 PM
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Car: 1991 Z28
Engine: 350
Transmission: 700R4
Re: TPI will not hold idle
Well the leak came from a small port on the back of the intake. It's capped and still having the same problem's also was back firing when i tried to move it
11-19-2016, 06:31 PM
#25
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Car: 1991 Z28
Engine: 350
Transmission: 700R4
Re: TPI will not hold idle
Plugged in laptop and ran it while data logging. Map sensor looked ok. tps was good iac was good and it was adjusting the timing. Fuel pressure was good as well Idk whats going on I was hoping the map sensor crapped out on me but it checked out ok. What should I check next ?
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