88 350 tpi formula, no tps signal, backfires, rich
12-10-2011, 02:25 PM
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Car: 1986 camaro
Engine: 5.7 HSR
Transmission: 700-r4
Axle/Gears: 3:42 auburn
88 350 tpi formula, no tps signal, backfires, rich
i got the car a week ago, stock everything, checked for codes, data, everything shows good, even closed loop, but there is no reading from the tps, MAF readings are in the 36000 range, changed both sensors with new ones, still pops backfires when past 2000rpms, has new plugs,wires,correct timing at 6' with est unhooked, car is nice but its driving me nuts! all everything is plugged in except emission junk, getting a code for tps, maf voltage and est, wth?!?!
12-10-2011, 02:29 PM
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Car: 1986 camaro
Engine: 5.7 HSR
Transmission: 700-r4
Axle/Gears: 3:42 auburn
Re: 88 350 tpi formula, no tps signal, backfires, rich
oh yeah, running hogrich and sounds like its got a nice cam, til you reset the ecm, and it idles between 1200/1500
12-10-2011, 04:18 PM
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Car: 91' Firebird SOLD
Engine: 350 TPI +bolt-ons
Transmission: 700r4
Axle/Gears: 3:42
Re: 88 350 tpi formula, no tps signal, backfires, rich
You may have a bad ecm. Check your car for bad grounds first. There should be a major ground point behind your passenger side head with one of the wires looking like a shoe lace.
Last edited by ninetyone; 12-10-2011 at 04:24 PM.
12-10-2011, 04:19 PM
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Car: 91' Firebird SOLD
Engine: 350 TPI +bolt-ons
Transmission: 700r4
Axle/Gears: 3:42
Re: 88 350 tpi formula, no tps signal, backfires, rich
You will continue to get code 42(EST) unless you unhook your neg. battery cable for a few minutes to reset the ecm.
12-10-2011, 05:13 PM
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Car: 1986 camaro
Engine: 5.7 HSR
Transmission: 700-r4
Axle/Gears: 3:42 auburn
Re: 88 350 tpi formula, no tps signal, backfires, rich
changed computers already, checks all body, chassis,engine grounds, injectors all ohm at 17
12-10-2011, 05:50 PM
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Car: 91' Firebird SOLD
Engine: 350 TPI +bolt-ons
Transmission: 700r4
Axle/Gears: 3:42
Re: 88 350 tpi formula, no tps signal, backfires, rich
If you have a new tps with the same problem, then I would try running new wires from the ecm to the tps. http://www.chevytalk.org/fusionbb/sh...hp?tid/241136/ Check out that wiring diagram.
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12-10-2011, 11:15 PM
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Car: 1986 camaro
Engine: 5.7 HSR
Transmission: 700-r4
Axle/Gears: 3:42 auburn
Re: 88 350 tpi formula, no tps signal, backfires, rich
maf unplugged makes no difference, im checkin out those schematics now thanks nintyone
12-11-2011, 09:49 PM
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Car: 1989 Formula - Red
Engine: 350 TPI
Transmission: 700 R4
Axle/Gears: 3.73 Posi
Re: 88 350 tpi formula, no tps signal, backfires, rich
You said the original MAF was reading 36,000, and you replaced it. What readings are you getting with the new MAF. They should read 3,000 at idle and about 9,000 at 3000 rpm under no load.
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