Fuse are good and ecm has been replaced. There is no engine light, but can not read anything from the computer The scan tool powers up fromt the trucks aldl(plug for the scan tool)but will not communicate with the trucks computer.Truck failed state inspection becouse it would communicate with state inspection computer and had no engine light on at that time.
Ecm has been replaced????? was it programmed ?
SOURCE: how to troubleshoot 1993 chevy Z71 pcm
Hi Nsilguero,
I apologize for the delay in responding.
From your description, I'm leaning toward a timing chain problem, first stretching, then skipping and finally breaking.
If you're getting voltage to the coil and still getting no spark, there is a test I'd like you to try.
Take off the distributor cap and have someone turn the engine over while you eyeball the rotor. Is it spinning?
This going to take some back and forth interaction. Comment me back with the results. We will proceed from there.
Mike
SOURCE: the ECM fuse keeps blowing out
check the wiring to fuel tank something shorting. replace wires to fuel tank.
SOURCE: The passenger side windows on 2003 silverado will
The fuse will also operate all the power windows, so if the others work the fuse is ok. This vehicle has high failure rate of the switch & the regulator.
Make sure the window "lock-out" switch on the drivers door allows all the other window to roll up at there own switch.
SOURCE: l203 chev truck no power ecm codes p0131, p0137, p0151, p0157
these are all O2 sensor circut problems
SOURCE: 91 S10 rough idle, stalling ALDL problems
Make sure there is no vacuum leaks.
Vacuum leak at intake manifold and vacuum hose.
Bad Idle Air Control Motor (IAC)
Low compression (170 psi + is OK)
Start cleaning and repair these trouble spots and see is there any improvement.
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For more advance DIY'er then you may try this.
Use a can of Berryman carburetor clean to locate the vacuum leak.
SEE SAMPLE PICTURE HERE
This is a 20-30 minutes job.
Vacuum leaks can occur in following locations.
Intake manifold AND/OR vacuum lines.
Intake manifold is not accessible unless the engine head if off.
You can still check the potential leak by spraying some Berryman near the intake manifold.
Listen for rpm increase after you introduce the Berryman (FUEL) at idle.
Do the same starting from the brake booster unit (the round unit) on the drive side fire all.
Carefully listen for increase of RPM right after to spray the Berryman to the potential vacuum spot.
Get a friend to HEAR the RPM increase or monitor for RPM on the tech.
DO NOT AIM the Berryman into any heat source.
PLEASE RATE my answer if it is useful to you.
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