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Prev Professional Automotive Repair Technical Discussions for February 8, 2006
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Open Help Requests for GM
Help Request Answers
1998 Buick LeSabre Custom 3.8L starter VIN: 1G4HP52K7W
Car came in with a crank (noisy, replaced starter) no start condition and a recommendation from another shop needed intake manifold. Verified manifold replaced same- and other listed items. Car was running well. Put in detail shop, and now wont crank. We have ...
2001 Buick LeSabre Limited 3.8L MIL Lamp on VIN: 1G4HR54K91
This car came in a while back with this same code AND a check gas cap message on the DIC. Well, it's back. Again I have done the trouble tree. Smoked the Evap system. Done the purge/seal test. THIS PARTICULAR CAR DOES NOT SUPPORT THE SERVICE BAY TEST ON THE... Trouble codes: P0440 (Evap Leak)
2002 Buick Rendezvous CX 3.4L information center VIN: 3G5DB03E32
see above
1992 Cadillac DeVille 4.9L stop,tail,and turn signal lights VIN: 1G6CD53B5N
We're working on a 92 cadillac deville for another shop. After having a transmission installed the customer stated his turn signals were acting funny. Customer took the car to a shop to figure out the problem. They could't find the problem and brought the car ...
1995 Cadillac DeVille 4.9L rear knuckle upper bushing VIN: 1G6KD52B6S
This Cadillac is FWD. The rear knuckle upper bushings are worn out. According to the mfg. they are not servicable. To replace these bushings you replace the knuckle. The knuckle is about a $1,000.00 retail. All for the sake of a $25.00 bushing. These bushings ...
1997 Cadillac DeVille 4.6L No Start VIN: 1G6KD52Y6V
Hello we have this cadillac that has extended cranking after sitting over night.After engine starts it acts like it is flooded.Checked fuel presure regulator for leakage by installing a clear hose and vacum pump ok.Checked fuel presure cranking 44psi.koeo 47ps...
1998 Cadillac DeVille Concours 4.6L Rear suspension VIN: 1G6KF5490W
I have today a Caddilac that has an intermittent lurch or shudder that appears to be coming from the rear suspension. Customer states it will jump to the side. I have been unable to duplicate and many other shops have tried alignments and tires. The ride level...
1990 Chevrolet K3500 Cheyenne 7.4L Poor Idle Quality, Hesitation, Stall VIN: 1GCGK34N4L
NEED HELP!!! OK. . . LONG story short, this vehicle has ALWAYS had a bit of a rough idle and sometimes would want to stumble/stall out. . .mostly when cold. Vehicle is a fleet use vehicle and we have put countless hours into this thing over the years in an ef...
1990 Chevrolet Camaro RS 3.1L Excessive Emissions, Poor Idle Quality, Stall, Misfire, MIL Lamp on
hello guys long day on this car with little results car was towed in would turn over but not start first two times i tried after i got it in the shop i could hold the key switch and it would stay running till i let go but i think it was just by chance because ... Trouble codes: 33 (map sensor high), 34 (map sensor low), 44
1995 Chevrolet Monte Carlo LS 3.1L temp gauge showed hot and heat indicator light cam VIN: 2G1WW12M6S
customer complaine dvehicle overheated . she was told that the cooling fans were the problem. they work fine for me [#1 comes on at 222 degrees snd #2 comes on at 235 degrees.the question i have has there been a bulletin concerning ecm temp senders [2 wire] be...
1996 Chevrolet Caprice Classic 5.7L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2B1B684P1T
help! car runs great until closed loop, as soon as this happens right bank run rich imediately. fouls out plugs in seconds not with raw fuel just black, loads up o2 sensors with soot to the point of plugging them up. i have put in 4 sets of plugss and 2 sets o... Trouble codes: 300 (multiple miss fire), P0154 (insufficient activity b2 s1), P1653 (oil level light circuit)
1997 Chevrolet K1500 Suburban 5.7L Cuts out, fire leaves VIN: 3GNFK16R0V
This Suburban was bought at car sale with bad trans. The trans was replaced with AC Delco Reman. The Trans works fine but on decel at about 1300 to 1350 rpm It fills like the fire leave for just a second. This can also be also be done on the floor if you load ...
1997 Chevrolet Cavalier 2.2L Misfire, MIL Lamp on VIN: 1G1JC124XV
Hey GM Tech's. I have this 1997 cavalier that doesn't want to go away. Vehicle origionally came in for a raw fuel smell or fuel leak. Upon checking, found #2 injector wiring connector with fuel coming out of it. Thought would be an easy Fix. Installed new fue... Trouble codes: P0300
1997 Chevrolet Cavalier 2.2L anti theft system VIN: 1GDF5244V7
hello gm techs hope you can help me with this one, have a cavalier that will start and then stall. vats system shuting down the injectors . setting code 1629 theft deterrant loss of cranking signal.have replaced ecm, ipc control panel ignition lock cylinder, s...
1998 Chevrolet K1500 Cheyenne 5.7L 1-2 shift, 2-3 shift VIN: 1GCEK19R3W
hello everyone, vehicle came in shop with no reverse and noise in transmission. all other functions normal, no codes. we replaced transmission with jasper unit. worked good for 75 miles then torque converter clutch started engaging as soon as vehicle would sta...
1999 Chevrolet Venture 3.4L no start VIN: 1GNDX03E9X
I have seen many replys on key lock cyl., ignition switchs, but could not find any thing real clear has to how to test these codes and what really fixed what code. The car would not start for a whole day, so he had it towed in today and I go out to push it in ...
1999 Chevrolet Monte Carlo LS 3.1L heater VIN: 2G1WW12M6X
I think I know the answer this riddle, but I would appreciate any other input. Vehicle in question has had a no heat complaint for several weeks. Customer has changed out the water pump and thermostat. Brought to us, I feel one side of heater hose hot, other s...
2000 Chevrolet C3500 5.7L Poor Idle Quality, Misfire VIN: 1GCGC33R5Y
2000 Chevrolet Astro 4.3L MIL Lamp on VIN: 1GCDL19W3Y
Hey guys, any help on this is appreciated. This van has been in several times before with the same code. The first time I cleaned the passage and replaced the EGR valve. The next few times I just cleared the code and did a visual inspection (once there was a c... Trouble codes: 404 (EGR open position performance)
2001 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1GCEK14T81
Truck came in with code P0140 changed b1s2 o2 sensor. came back soon after with codes as above. Checked cat converter for pluged Clean and Clear, could not find vacuum leak at intake with carb clean. Plugs all look good. Missfire monitor 1,3,5,7. Sometimes idl... Trouble codes: P0131 (b1s1 low voltage), P0140 (b1s2 low activity), P0151 (b2s1 low voltage), P0300 (multiple missfire)
2002 Chevrolet Avalanche 2500 8.1L Cuts out VIN: 3GNGK23G32
Hello Techs I hope you had a better day than myself. We have this 8100 engine came in with crank sensor code. We thought no big deal, the last one we put in was stuck but with prying, twisting, turning, and plenty of penatrating oil it finally came out. This ...
1999 GMC C1500 Suburban 5.7L steering VIN: 3GNFK16R5X
problem occurs at low and medium speeds,almost like power steering cuts out at times,any help would be great,thanx blas(mill rd.)
1994 Pontiac Sunbird SE 3.1L Excessive Emissions, Poor Idle Quality, Stall VIN: 1G2JL14T8R
Help! This is my first posting so thanks in advance. This sunbird must like the sun because it only acts up on a cold start, ie. ECT (30 degrees F. On start-up (it needs some throttle to start), its running so rich it fills the shop w/ black smoke and no codes...
1995 Pontiac Trans Sport 3.8L Poor Idle Quality, Surge, Poor Fuel Economy, MIL Lamp on VIN: 1GMDU06L2S
Hi folks, we don't ask for help often but this vehicle is a handful. Various sensors have been changed by someone else. some wiring had been bypassed or redone, we have corrected all wiring and put back to origional. Problem, poor idle quality, iac surges up a...
1997 Pontiac Trans Sport 3.4L No Start VIN: 1GMDX06E4V
I group ,this van has a no start condition that will show once at three months interval !!! The Lady came this morning,she was at the drug store , and it was acting,got spark but can ear the fuel pump relay clicking 2 time per second .I went get the tow truck ...
1999 Pontiac Grand Am SE 3.4L No Start VIN: 1G2NE52E9X
after replacing the intake gaskets, plugs & wires--the engine was hard to start (there was a lot of coolant in the oil system--it was like a lifter issue)--the engine did start but ran rough then was fine except for misfire on the #5 cylinder. We let the vehic...
2000 Saturn LS2 3.0L Misfire, MIL Lamp on VIN: 1G8JW52R7Y
Hi everyone, this is my first posting, I hope you can help me. This car came in with 2 codes (P0300 & P0304). First thing my tech did was look at missfire data, on our Snap-On MODUS, and noticed cylinder #2 was slowly counting a missfire, but the car was defin... Trouble codes: P0300 (Random Cylinder Missfire), P0304 (Missfire Cylinder 4)

Fixes & Summaries for GM
Fix/Summary Answers
1999 Cadillac Catera 3.0L Passenger side cylinder head VIN: W06VR52R2X
Thanks to all who replied, after four times of adjustments, my technician finally got it to run smooth, the valve timing was off, chalk that one up to a learning experience. I still cant believe that one tooth off made it run that terrible. Thanks again. Paul
1997 Chevrolet C1500 5.7L Misfire, MIL Lamp on VIN: IGCEK19R8V
we have replaced the fuel pump (it was bad), cap and rotor (it had a burn spot between #3 and #6), Intake gaskets (it was leaking in cyl #4), fuel pressure reg is not leaking, rocker arm studs are not pulled out, valve springs not weak or broken, spark plugs a... Trouble codes: 306 (cyl 6 missfire).
1999 Chevrolet Venture 3.4L Cuts out, Stall VIN: 1GNDX03E3X
sure enough,intake gaskets had been done and crank sensor harness was rubbing against exhaust manifold.replace harness problem solved.thanks to all who responded
2001 Chevrolet Impala LS 3.8L vats/bcm VIN: 2G1WH55K11
Well many thanks to the 12 that offered me help! The replies were basically grouped into three main areas...Ignition/Theftlock switch, PCM/BCM, Crank relay/starter. I was in this general area when I posted the request so thankyou for helping me narrow it dow...
2001 Chevrolet S10 4.3L engine VIN: 1GCCS19W61
Hi. Thanks for everyones response. It was indeed the intake gasket begining to fail. Dan [...]'s suggestion of leaving out the drain plug while under pressure was the solution. After being pressurized for a hour a small trickle of anti-freeze started to d...
2003 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNET165X3
We monitored the front and rear O2s a couple of times when the engine and cat was cold and noticed while both sensors were working, the rear sensor was reading higher in voltage both times then the front. This led us to believe the front O2 was biased lean, wh... Trouble codes: P0171 (System lean), U1000 (Serial communication).
2004 Chevrolet Avalanche 1500 Z66 5.3L speedometer VIN: 3GNEK12T24
the customer took the truck back to the dealer & they replaced the cluster he just got it back today 2/806 and as not had any problems thanks for all the help mike
1998 GMC Savana 1500 4.3L water pump VIN: 1GTFG15W4W
First of all, thanks to all who responded. All suggestions were helpful and sound. The most common suggection was 'bolt size/thread depth'. Though ok on this on, always good to stess the fundamentals. What I have done, is replace the coolant back to oat ethlye...
2000 GMC Yukon SLT 5.3L No Start VIN: 1GKEC13T3Y
we tested the ignition switch for a possible faulty connection and found none We replaced the ignition switch and relearned the theft deterent system. Now the theft deterent was operating but we still had an intermittant loss of communication with the BCM and ... Trouble codes: P1626 (theft deterent system-fuel enable circuit), U1000, U1064 (Lost comm), U1016.
2002 GMC Sierra 1500 SL 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GTEK14T12
Ok first off thanks to all those that replied. I first tried a fuel pump to no avail to rule the possibility of it somehow being damaged from accident. The probelm was ittermittent and hard to track down. The intake gaskets were the culprit and was discovered ... Trouble codes: P0300.
2000 Oldsmobile Alero GL 2.4L noise VIN: 1G3NL52T7Y
Removed bearing and hub left side and axle shaft assembly. Inspected outer CV joint. Joint seemed ok. Mounted bearing and hub assembly in vise. Inspected for movement, none found. Threw the dice, replaced lefthand bearing and hub assembly. Road test, noise gon...
1995 Pontiac Bonneville SE 3.8L Poor Idle Quality VIN: 1G2HX52K7S
First of all, thanks to all that replied. Most of you were right about it being OBD1 compliant with a OBD2 connector. I myself included, haveing worked at a GM dealership for many years also new this was a trasition period car where it was amoung the first yea...
2000 Pontiac Firebird Formula 5.7L Poor Idle Quality VIN: 2G2FV22G9Y
the fuel trim numbers are very good .i am pretty sure the pcm has been modified because the egr is removed & the rear o2 sensors are disconected. the monitors have run & passed & set no codes. putting the throtle plate hole back to stock helped enough to satis...
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