I am trying to help a friend of mine to fix his 97 Grand AM with a 3.1L
V6 engine automatic. The car ran fine till today with the exception of
that it would sometimes need longer to crank the engine to start it
(either cold or hot). Today it suddenly died at a traffic light, and a
couple of times on his way home after that. We checked it parked, it
idles smoothly at about 600 RPM but sometimes will start shaking and
losing RPM and then die. It seems to do this completely at random times
either in park or in gear. What could the problem be? Thanks in advance
for any info.
See what trouble codes, if any, are set. Then go from there. It
Or one of several other problems. Diagnose first before throwing
parts at it.
Thanks to you all guys for the info. Just an update. Today we unplugged
the MAF sensor and drove for a while, no problem (of course the light
was on). We then plugged it back and again no problem. Will have to wait
until it stalls again to check if really this is the sensor. Will pull
the codes off the computer. Is this a simple procedure like on Ford's
OBD-IV, or it needs a special scanner?
Just one more update a couple days later. The car ran with no problem
whatsoever. I am now guessing maybe there was a bad contact to MAF
sensor. When we disconnected and reconnected it, this made the contact
better. Or, there are some spliced wires in the same region. Maybe there
is a bad contact there. Again we moved them a bit and this made the
contact better for a while. BTW, tapping on the sensor did not make the
engine stall. Interestingly, the same testing method -- tapping is given
in the Hanes manual for this car. Are there some fragile parts inside?
The sensor itself looks very solid.
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