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Reload this Page 1992 Z28 rough idle and many more problems!

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Old 09-16-2009, 06:47 AM   #1
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1992 Z28 rough idle and many more problems!
My buddys Camaro makes me crazy......

Here the hard facts:
1992 Camaro Z28, L98 engine, TPI MAP Setup, 1227730 AUJP, completly bone stock, emission systems so far as I see Smog pump, Evap, EGR.

the symptoms:
rough idle but not stalling, bad fuel mileage, bad acceleration with part throttle opened

what we use for diagnostic:
self built 8192 aldl cable with MAX232, TunerPro RT, handheld vacuum pump, voltmeter, fuel pressure gauge

what we did:
we changed spark plugs, spark plug cable, distributor rotor and cap, pick up coil, ignition module, ignition coil, OČ sensor, ECM with prom
All parts were new and came from sealed boxes, except the ecm.
We checked the fuel pressure (41psi with engine off drops down to 38 psi by 2500 rpm). All vacuum lines were checked for cracks, puncture and proper seat. Firing order were checked also. Ignition timing, checked 0° with EST bypassed. TPS and MAP were checked and works fine.

what wee see:
no trouble codes were stored, in cloosed loop the OČ hang around 0,6-0,8V and BLM and INT get in the low 80's. With tranny in 2 and foot away from pedal (decceleration, cut off mode) the OČ dropped down to 0-0,02V and BLM/INT go to the default 128.

Actual, I have no more ideas what we can checked or fixed.......

Any help is welcome from a frustrated guy......
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Last edited by 262cui; 09-16-2009 at 09:30 AM.
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Old 09-21-2009, 01:46 PM   #2
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Car: 1991 RS
Engine: 383 MAF TPI
Transmission: Richmond 6 speed
Axle/Gears: Moser Ford 9 inch

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Re: 1992 Z28 rough idle and many more problems!
This wouldn't affect your BLMs, but I thought base timing (with est disconnected) was 6 deg BTDC, at least on MAF cars.
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Old 09-22-2009, 04:41 AM   #3
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Re: 1992 Z28 rough idle and many more problems!
Ok, I will check this. The emission label under the hood is missing, but I will find the exact value.
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Old 09-23-2009, 12:14 PM   #4
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Re: 1992 Z28 rough idle and many more problems!
Update:
I have checked the EGR Valve for dirt in the passage. Nothing. The valve moves freely and is in good working condition.......
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Old 09-23-2009, 03:43 PM   #5
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Car: 1991 Z28
Engine: 383 TPI
Transmission: 700R4 w/2800 stall
Axle/Gears: 3.23

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Re: 1992 Z28 rough idle and many more problems!
My 91 Z28 with a 305 TPI is also 6 BTC, hopefully someone w/ 350 could verify it's the same.
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Old 09-23-2009, 04:26 PM   #6
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Car: 1989 IROC-Z
Engine: 350 TPI
Transmission: Th700R4
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Re: 1992 Z28 rough idle and many more problems!
305 and 350 have 6 Deg BTDC
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Engine: TPiS Airfoil / MSD 8366 Distributor / MSD Blastercoil (48.000Volts) / MSD 8.5 mm
Ignition Wires / Custom PROM [ by me ] / Holley AFPR / Bosch III 22lbs Injectors / Autometer Cobalt
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1991, 1992, 92, camaro, chevy, egr, engine, fuel, iac, l98, problems, starting, symptoms, touble, valve, z28
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