Question about 1991 Isuzu Pickup

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Need to adj timing on 1991 isuzu pick up 3.1 & cant find est wire . where is it & what colar?

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  • Drew Lendabarker
    Drew Lendabarker Mar 24, 2009

    I have the same problem. It runs very high and has blown out my muffler.



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The distributor cap is what controls your timing so just take look at that because my does the same thing but i dont know how to adjust it

Posted on Apr 24, 2009


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Mar 24, 2017 | Isuzu Cars & Trucks

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Engine stalls driving down the road or on take off. Had code 42. electronic spark tining. E S T circiut fault. Cleared codes and installed a fuel pressure gauge. On test drive the motor, (3.1 EFI) still...

Trouble Code 42 indicates that there may be a malfunction in the Electronic Spark Timing (EST) system. During cranking, the timing is controlled by the ignition module and the ECM grounds the EST line. It expects to see no activity on this line at this time. When the ECM enters EST mode, it applies +5 volts to the BYPASS line and expects to see voltage variations on the EST line.
Reasons for the ECM to set Code 42:
1. System in BYPASS mode (i.e. EST line supposedly grounded) but activity sensed on EST line
2. System in EST mode (i.e. BYPASS line driven with +5 volts) but no activity seen on the EST line

Possible causes include:
1. BYPASS line is open or grounded
2. EST line is open or grounded
3. Poor connections between ignition module and ECM
4. Poor routing of EST harness and/or poor quality ignition wires (EMI induced electrical noise
5. Faulty or incorrect ignition module
6. Faulty ECM
7. Faulty Pick Up Coil
8. Faulty Ignition Control Module
9. Faulty Crank Sensor or the Crank Sensor magnet probe could be cracked

Jan 15, 2011 | 1991 Chevrolet Lumina

1 Answer

Ive removed the locking ring on the rear of the headlight on my 1991 isuzu but cant seem to free the buld assembly to replace the headlight bulb

On some of these headlamps there is a spring clip that you squeeze together to free off the clamp, the locking ring is only for the wiring.

Jul 19, 2010 | 1991 Isuzu Trooper

1 Answer

Cant find the wire to unplug and dissable est on 1991 s-10 to set timing

I believe it should be a 4 wire plug. There should be 4 wires coming out of the distributor with a plug. I know some GMs had a single green wire with a plug also.

Jun 14, 2010 | Cars & Trucks

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If you have the head of the key the code is under the plastic on the metal. If the keys are all lost you will need proof of ownership and a photo ID. That you would take to any Isuzu dealership to obtain new keys

Apr 28, 2010 | 1992 Isuzu Pickup

1 Answer

Have a 1991 isuzu rodeo 2wheel drive banjo type rear end, pulled all 4 bolts out of plate now i cant get the shaft out with a slide hammer whats up?

Are you are trying to pull out one of your axle shafts? If so, there is a retainer clip inside the differential that needs to be removed first.
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Feb 22, 2010 | 1991 Isuzu Trooper

1 Answer

1991 chevy S 10 EST not working

Check out the Knox sensor & or the Blue wire going to it if it is Grounded , the timing will not Advance, Knox sensor is there to detect knock then it grounds if it catches a Knock to Prevent
Pre Ignition Ping-SPARK KNOCK-

Dec 08, 2008 | 1991 Chevrolet S-10

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