Possible PCM failure

Recently my 94 SL2 automatic with ABS has been unable to start. The
problem appeared once, went away, and then reappeared for good a few
days later. The problem is that the car will turn over and immediately
die. The engine appears to fire for a few revs, and the tach deflects,
but will not continue running. I ran some tests based on the Chilton,
and replaced the IAC based on the faulty specs given in this book.
This did not help, so I performed some half-cocked diagnostics and
replaced the crankshaft position sensor as well. No codes in the PCM.
My nose tells me that fuel is getting in, and my ears tell me that the
fuel pump is moving. Spark is good at the plugs and coil towers. The
intake tract and filter is in tip top shape. I clamped off the
canister purge line without effect so the purge solenoid doesn't seem
likely. The EGR solenoid tested good as well. After spending a few
evenings lying on the cold concrete and testing parts in the dark, I
towed the car to a mechanic who ran his scanner on it and has
determined that the PCM is bad. I am suspicious of such a claim since
the PCM is being blamed as a result of a lack of other problem rather
than a positive test on PCM performance.

ideas? The dealer is quoting ~$600 for a new PCM and re-program. Is
the reprogram needed? I can install the PCM myself and get a cheaper
one as well as long as the reprogram is not required. It is getting
too cold to keep riding my bike!


Thanks
-Jon

 

I'd be AMAZED if it is the PCM. Was this a Saturn retailer's service
department that made this diagnosis? If not, then you may want to spring
for the diagnostic from Saturn. If it saves you from buying one part you
don't need, then it has paid for itself.

PCMs come and go on eBay quite a bit, and usually sell for $50 - $100.
Replacing yours will require that the new one be flashed (re-programmed) so
that it is aware of your car's options (cruise, traction control, abs,
tire/wheel size, etc.). You can try it without this, but it probably isn't
likely that the car it came from had the same options as yours.

Lane [ lane (at) evilplastic.com ]