Rough Running Z
 

I posted some history under another thread for Cam Position Sensor, but here is the problem. After no issues for 2 years, the car started missing suddenly about 10 seconds after startup. The SES light came on and was traced to fault code 31 - Cam Position sensor. The sensor was checked and determined not to be the problem, but in the course of suspicion of the common injector problems in 90-92's a couple of bad injectors were found. New Delphi SS injectors were ordered and installed, but upon startup the car still ran as if on 5-6 cylinders and then stalled and wouldn't restart. Fuel pressure was checked and is fine. Spark plugs were pulled and checked and are fine and do not appear to have been flooded with fuel and we do have spark.

Anybody got any other ideas of where to look to find this elusive problem?

Re: Rough Running Z
 

do a compression and/or leak-down check on the cylinders.

Re: Rough Running Z
 

something under the plenum is out of ordre - hosed up during the injector replacement.

Re: Rough Running Z
 

Yep Bent pin etc, check the wiring you might have pinched something

Re: Rough Running Z
 

Check to see if the MAP hose is unplugged.

Re: Rough Running Z
 

Actually traced back to a bad ECM. Anybody know sources to find one or get one rebuilt?

Re: Rough Running Z
 

A good possibility - what led you to that conclusion?

Re: Rough Running Z
 

New ECMs have become very scarce and very pricey indeed.
I remember a thread a few months ago which referenced a company that refurbished our particular ECMs.
I will have to go digging around to find it.
Don't get false hope if you should find an ECM listed on some car parts web site.
It'll be for the L98 or the LT1 not the LT5.

Check with Marc Haibec, he'll either have one or know where to get one.

'Crabs

Re: Rough Running Z
 

I have a known good, used ECM out of a low-mile '91. I'm really not looking to sell it but if you absolutely can't find one send me a PM.

Re: Rough Running Z
 

I believe Kurt White has a rescource on this for the rebuilds he is on here as LIMEY

Its a rebuild service with a quick turn around

http://www.whiteracingproducts.com/


I have used Kurt repeatedly for scarce parts.