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I have a 92 GMC sonoma with V6, 5-speed manual, 174k miles. everything has
worked fine up until now. when the engine is cold, the truck drives
perfectly. however, when the engine has had time to warm up and i have
driven about 2 or 3 miles, the "service engine soon" comes on and the there
is a BIG loss of power. also, when the engine light is on, and the truck
has lost power it starts to shake like its trying to stall, but never
actually stalls. the problem occurs with the AC on and off. I read that the
catalytic converter could be to blame, or possibly the fuel pump. any help
would be very appreciated.
THANKS!
everyone
I don't quite get to Tuscaloosa or Birmingham but I do get over to Muscle
Shoals occasionally. Dales is a good steak house near
Sheffield/Florence
Need to pull the trouble codes first.
tbaxleyjr
so im assume that would require me to go to the GM dealer? how much would a
code scanner cost?
everyone
you dont need a scanner for a 92
http://www.autozone.com/servlet/UiBroker?ForwardPage=az/cds/en_us/0900823d/
80/12/39/d6/0900823d801239d6.jsp
read through this and follow the links to ALDL and trouble codes - all you
need is a jumper wire or a paper clip
tbaxleyjr
Yes the trouble code will tell you exactly whats wrong.
This sounds to me like an EGR problem btw also based on your
description.
The error code, then the problem. It could also be the oxygen sensor
overheating.... Its almost certainly something in the emmission system.
[edit]Oh yes it could be the catalytic converter also or muffler. Most
likely it is EGR valve but sounds like exhaust is plugging up somewhere
good luck come back with error code description[edit]
stamar
Once everyone comes back with his trouble codes (he will have some since
the check engine light is on), all of us can help him determine the
appropriate testing and diagnosis to determine the root cause of this
problem. I would rather us do that instead of throwing parts
tbaxleyjr
egr comes on the moment the engine does (and you leave idle and are not
wot)
and the cat wouldn't be a warmup problem it'd be from the moment the engine
is started
if its a warm up issue its:
o2
ignition coils
thermostat
fuel pump is highly possible(replace filter at same time)
(its late I'm tired I'll add more to this list tomorrow sry sleepy time)
Pieface
or....
spark-plugs not gapped properly, fuel injection system problems, etc...
There will be some codes since the service engine light comes on. You can
replace all of the parts on a car or you can pull the trouble codes and
determine where to start looking for the problems.
tbaxleyjr
DEFINITLY need trouble codes first BUT.....Egr does not engage at idle,
does not engage upon fairly heavy acceleration and does not engage at WOT.
IF this system is electronically controlled by a vacuum switching valve or
sensor that is fauled up, you could still have an EGR issue but not likely.
The only reason there would be a loss of power and stumbling would be
EXCESSIVE EGR flow causing the fuel/air mixure to be too Diluted with air
ie) exhaust. If the EGR valve was stuck wide open or TOO much open, the
problem would be there from the start-up. I also concur that if there was
a cat. conv. issue it would be from the time the engine was started. That
is not the issue unless for some strange issue is going on with thermal
expansion when it gets REALLY hot.....NOT LIKELY at all....bout the same
odds as a snow ball's chance in hell.
Other than that, if the light comes on ALWAYS scan the codes.....till you
do you're waisting your time. It could be ANYthing....We'll see what he
comes up with!
cmeseadoin
