My 1995 3.8L Regal has 114,00 miles. I understand that it is has an emission
control system between OBDI and OBDII. The check engine light comes on every
now and then, but I can't pull codes with a rental tool from Autozone or
Murray's and I believe that I can't use a test light to hook to the
connector and count the number of flashes (can't find out where to hook it
up on the under dash connector.) It runs rough every now and then, almost to
the point where it wants to die. Other times, when I go to start the
vehicle, it takes 10 or more turns of the key to get it to start. Changes
filters, though still have the problem. I like to fix it myself. A friend
suggest that the crankshaft positioning sensor was know to go bad on this
vehicle. Could the problem be with this sensor? Any suggestions are really
Agreed, but I can diagnose a bit of this right here.
EGR valve or whatever it uses on this model(mine is the
older version of the same engine) is shot. Can't hold idle,
like the choke is constantly being messed with as it's running
(say on a motorcycle).
Check. Mind did this too. Timing grear on these models are
*synthectic* and wear down to nubs. In any case, the chain is
stretched and the sensors are likely not working well. It's a
known problem with them when they get to this age.
If the timing gear is off but the sensors are working, or it
is loose and "hanging in there" and the computers are compensating,
it won't generate anything reliable code-wise from the cheap
In my case, three mechanics scratched their heads. One said
the engine was dead - no compression. One had no clue - his
cheap scanner spat back a cryptic "do not run" message and
no codes whatsoever. The other guy tweaked it and got it to run.
Barely. Like a VW bug with a dead cylinder. Three weeks and
it still didn't run right.
The GM garage scanned it, diagnosed it in an hour, and had
it running perfectly by the end of the day. Replaced the MAF,
the EGR valve, and the timing gear.(yes, it was a pricey repair
- about $800 in total with the diag fee). I had the timing
gear replaced with metal parts, though - teflon and plastic
isn't my idea of proper engineering)
Just a thought, on the starting issue. If it cranks good but won't start
for a while, the next time, have a helper crank the engine, while you
check for spark at the plugs and injector pulse. My info shows you have a
crank and cam sensor, you might check for a sensor signal, while the
problem is ongoing.
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