no-start '93 960

Hope someone can provide some insight: 168,000 on a fairly well maintained
'93 960 wagon. The check engine light has been coming on for many weeks.
Codes are always long and short term fuel trim related. Runs rich. Cleaned
the throttle body, replaced the O2 sensor, fixed a torn vacuum hose
connector and still the check engine light comes on. Checked the plugs and
compression while I was at it. Immediately after checking the compression,
it ran very poorly for about 10 seconds, stalled and has not fired since.
Any ideas what to try next? Thanks.

 

Check for codes & post back

--
"*-344-*Never Forgotten"
Is for the New York City Firemen who lost their lives on September 11,2001.
The official count is 343, but there was also a volunteer who lost his life
aiding in the initial rescue efforts. And I will never forget them as
long as I live,
nor should any American.

 

Did you reset the codes after the O² fix? Recheck the codes fix any
indicated faults then reset the codes to 1-1-1 for all code indications.

 

Make sure that the coils were replaced on the proper plugs and that the
coil harness isn't pinched anywhere.

Bob

 

Before and after replacing the O2 sensor, the following faults codes would
be captured with just a few minutes of driving: 231 (long-term fuel trim,
part load) 511 (long-term idle air trim) 512 (short-term fuel trim). I've
been fussing with these codes for many weeks and miles. The engine has been
running a little rich so I suspected faulty O2 sensor. The new one did not
affect the problem. Then I suspected an air leak and fixed one of those.
It idled a tad smoother. Still the fault codes would keep appearing. This
past attempt, the codes were cleared, plugs inspected (newish 4 prong Bosch
platinums) and the compression checked (roughly even 160 lbs). It was at
this point the engine would barely idle for a few seconds and has since
ceased to fire. I have voltage on all six coils. All are in their correct
places. I see spark on #1 and smell gas in #1. I hear the fuel pump when
turning the key to the run position. I've tried resetting the fuel trims to
the default by disconnecting the battery for 10 minutes. That did not help
either. I hate to jump to the conclusion that the ECM or MAF sensor is
damaged. I was hoping someone would recognize these symptoms and point me
toward the guilty component.

Thanks,
Ric

 

Have the same problems with my 1991 740Turbo sedan