97GT-Timing problems

kmauldin · 03-03-2005, 07:55 AM

Does anyone know how to check that the PCM (ECU/brain-box) is functioning properly or how to check if the engine has "jumped" time (meaning one or both of the timing chains have slipped)?

Mine is running extreemly bad, like the timing is off, and the OBD code reader shows two codes saying there is an ignition curcuit "malfunction." My initial tests suggest the PCM is not sending the spark to the coil-packs but I wanted another way to confirm this. Any suggestions?

thanks

Zanzer · 03-19-2005, 03:04 AM

Have you tried pulling the crank position sensor to make sure there's no crap on it. It's magnetic and any shavings and such it picks up will throw the ECM off.

kmauldin · 03-20-2005, 06:22 PM

Thanks Zanzer. It ended up being the low voltage input connections to one (or both) coil packs. I pulled them off and they were corroded somewhat. I cleaned them with a small wire brush and re-connected them and that did the trick. I had a feeling it was something simple but I was expecting the worst.

03-03-2005, 07:55 AM	#1
kmauldin Registered Member Join Date: Nov 2001 Location: Atlanta, Ga. Posts: 22	97GT-Timing problems Does anyone know how to check that the PCM (ECU/brain-box) is functioning properly or how to check if the engine has "jumped" time (meaning one or both of the timing chains have slipped)? Mine is running extreemly bad, like the timing is off, and the OBD code reader shows two codes saying there is an ignition curcuit "malfunction." My initial tests suggest the PCM is not sending the spark to the coil-packs but I wanted another way to confirm this. Any suggestions? thanks __________________ KMM '97 GT coupe; K&N, 3:73's, steeda tri-ax, Mac catted H, Mac flow-path cat-back, aluminum driveshaft, white face guages

03-19-2005, 03:04 AM	#2
Zanzer Registered Member Join Date: Mar 2005 Posts: 2	Re: 97GT-Timing problems Have you tried pulling the crank position sensor to make sure there's no crap on it. It's magnetic and any shavings and such it picks up will throw the ECM off. __________________ 98 GT Cervinis Stalker kit Cobra R rims FRPP 70mm TB Steeda timing adjuster Steeda underdrive pulleys Home Depot CAI All show.....no Go Own a non-PI 4.6? Click here

03-20-2005, 06:22 PM	#3
kmauldin Registered Member Join Date: Nov 2001 Location: Atlanta, Ga. Posts: 22	Re: 97GT-Timing problems Thanks Zanzer. It ended up being the low voltage input connections to one (or both) coil packs. I pulled them off and they were corroded somewhat. I cleaned them with a small wire brush and re-connected them and that did the trick. I had a feeling it was something simple but I was expecting the worst. __________________ KMM '97 GT coupe; K&N, 3:73's, steeda tri-ax, Mac catted H, Mac flow-path cat-back, aluminum driveshaft, white face guages

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