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Prev Professional Automotive Repair Technical Discussions for March 17, 2005
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Open Help Requests for GM
Help Request Answers
1996 Cadillac DeVille 4.6L blower motor VIN: 1G6KD52Y5T
Customer said his blower motor quit working the same day a friend cut the red power wire to vehicles alarm siren. I didn`t see any connection so I checked for trouble codes. None were present. I then followed the diagnostic chart in my Motors AC manual for no ...
1997 Cadillac DeVille 4.6L Heater Core VIN: 1G6KD54YXV
I replaced the first leaking heater core at 145753 miles. It came back to the shop at 151713 miles with a leaking heater core. I replaced it again. it came back to the shop at 163675 miles. I replaced it again following Standard Plus instructions to have the c...
1997 Cadillac DeVille 4.6L Stall VIN: 1G6KD54Y5V
guys this caddy had a coolant leak and found the head bolts stripped, after repairs the engine ran fine for 300 miles, now stall out when hot, clean throttle body and mass-air flow sensor, still the same problem, raise basic idle 100 rpm and engine does not st... Trouble codes: P1599
1998 Cadillac Seville STS 4.6L security VIN: 1G6KY5492W
Secuity light on dash stays on.displays ,service theft system on dash readout.then says,exp id 34
1988 Chevrolet Camaro Iroc-Z 5.0L MIL Lamp on VIN: 1G1FP31F4J
Hey guys, I have an old one here thats giving me fits. This car is a garage queen, it only has 18k miles on it. This car is perfect showroom condition. What I have going on is that when its cold, on initial startup, the MIL lamp will come on with a code 34, MA... Trouble codes: 34 (maf low)
1995 Chevrolet G10 Chevy Van 5.0L High Line 180-190
Apparently the problem surfaced 3 weeks ago, "we just got it in" with a hard 1-2 shift complaint.2-3/ 3-4 are fine. Electrically this thing checks out fine. But gauges state high line... We have at this time replaced the following trying to nail this one... -P...
1997 Chevrolet K1500 Cheyenne 5.7L missfire VIN: 2GCEK19R1V
po300 random cyl missfire. not the same cyls everytime but #5 cyls always. this problem only occurs under heavy load, wide open throttle, or hauling a loaded horse trailer on hills. doesn,t always set code but most times willmiss on load and runs poorly on dec...
1997 Chevrolet Lumina 3.1L No Start VIN: 2G1WL52M8V
Hello this car came in with a no mod is ok coils are all ok. I check lower crank postion sensor on damper it check's ok. cam sensor I think is bad from what I am getting. still have to check other crank sensor on block would a cam sensor on gm cause ...
2000 Chevrolet Venture 3.4L high idle VIN: 1GNDX03E5Y
I have this 2000 chev venture it has an high idle after hot soak. There are no codes and I have tried to reflash computer and it did not help.
2000 Chevrolet Silverado 1500 4.3L engine VIN: 1GCEC14WYE
hi guys truck came in with coolant leak at rear of intakemanifold . truck ran ok, no noise.replaced gasket and oil change. started engine and now has noise. sounds like rod rapping.oil pressure is 60 psi. no cylinder misfire. no codes.
2000 Chevrolet S10 2.2L MIL Lamp on VIN: 1GCCS1950Y
Sorry for the bad post but this truck has me stumped. I Can't find any info on p0178 or p0179. If any one has a diag tree or any thing that would be helpful please let me know email [...] Thanks for any help Trouble codes: P0178 (No info), P0179, P0141
2002 Chevrolet Suburban 1500 LS 5.3L Misfire VIN: 1GNFK16T52
Car came in with a missfire. It had never had a tune-up, so we replaced plugs, wires, and all filters. It still continued to miss. Checked missfire data, showed cylinders #2 & 4 missing. Tested injectors, they all work. Checked compression, all had 130 psi. th... Trouble codes: P0300 (random missfire), P0302 (Missfire cylinder 2)
2003 Chevrolet Impala 3.4L passlock ii VIN: 2G1WF52E93
good day, vehicle came to shop with the complaint of security indicator in message center would be on after starting intermittently, customer stated that it seemed to occur after it was restarted when vehicle was warm inside. 1st start in morning or after work...
2004 Chevrolet Silverado 2500 LS 6.0L Alignment VIN: 1GCGK23U84
I have exhausted my resources on whether or not I need a Tech 2 to do a 4 wheel alignment on a GM quadrasteer vehicle. Can I enter the "alignment mode" with my OTC Genesis? I'm trying to figure this out before I have one waiting on the rack. Thanks Kevin
2004 Chevrolet Venture LS 3.4L windshield? VIN: 1GNDX03E34
Vehicle has a very annoying & loud buzzing sound when traveling at speeds at or above 65mph. It seems to eminate from the windshield right in front of the driver. It does seem to dissipate with a window cracked. Also is most apparent in a crosswind. Have seen ...
1996 GMC K1500 Suburban 5.7L 2-3 shift VIN: 1GKFK167R6
Hello everybody this is my Suburban and this is a little out of my relm. It drives fine when you drive it nice but if you have to kinda get on it when getting on a freeway (about 3/4 throttle) it won't shift out of 2nd gear unless you completely back out of th...
1998 GMC Jimmy SL 4.3L Temp Door VIN: 1GKCS13W4W
I have a Jimmy that was brought to me from another shop. The temperature fluctuates from hot to cold and will not stay steady. There is a code b0408. The previous shop replaced the ECC control head thinking this would solve the problem. I have tried the recali...
1992 Pontiac Grand Am SE 3.3L Hesitation VIN: 1G2NE54NXN
this 92 grand am has been in the shop several times for the same reason. hesitation on accel. customer replaced own t.p.s, we checked that it is ok. we have replaced ign. module and coils with known good parts, ecm power + grounds ok, has new crank sensor, als...
1993 Pontiac Grand Prix SE 3.4L Hesitation, Cuts out, Stall, Misfire
Thanks in advance for any help I can get. The situation is that the vehicle was driven for two years running poorly and now the customer has money to repair it. Intake gaskets replaced due to vacuum leak and plugs and wires replaced for tune up. On accel or j...
1996 Pontiac Bonneville SE 3.8L upper intake melted plastic at e.g.r stove pipe VIN: 1G2HZ52K3T
diagnosed customers complaint of a coolant leak,plastic upper intake was leaking,melted plastic that was blown upward at egr port,replaced lower intake gasket and installed new plastic upper intake and gaskets. three days and seventy five miles later same prob...
1997 Pontiac Grand Am GT 3.1L heater VIN: 1G2NW52MXV
hello techs I have a 97 grand am with no heat. Came from another shop. Supossedly has had thermostat changed. Temperture comes up toi normal but blows no hot air.Water in resorvoir is hot all hoses are hot only bleed screw is above water pump no air is evident...
2000 Saturn LS1 2.2L Cam Timing VIN: 1G8JU52F5Y
while setting the cam timing by lining up the approapreate markings on the cam and crank gears with the colored links on the timing chain. When I rolled the engine over to make sure the valves did clear the pistons: all of the timing marks do not line up again...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick Park Avenue Ultra 3.8L abs light VIN: 1G4CU5211W
Thanks to all who replied! An aftermarket(inexpensive) hub was the culprit!! NEVER AGAIN!!! found and verified by switching the wheel speed sensor wiring at the ebtcm Thanks again Marty
1999 Cadillac Seville SLS 4.6L Cuts out, Stall VIN: 1G6KS54Y3X
After checking all the components recommended by members, I replaced the crankshaft position sensor since I had seen this on a prior vehicle.The problem has not reoccured. Thanks to all who replied.Nasser
2000 Cadillac Seville SLS 4.6L Starting VIN: 1G6K5S4Y8Y
This problem is so intermittant, I get this car in the shop it cranks over just fine. The customer picks up the car, it's good for a day or two then it's back to the same thing, I ever get to the bottom of this I will post the fix. Thanks to all who responded.
1985 Chevrolet Corvette 5.7L Hesitation, Stall VIN: 1G1YYO782F
It was the PCM. Most people said to check fuel pressure, ignition switch, to be weary of aftermarket dist from napa, faulty injectors, sticking egr, I had checked the fuel pressure several times at it was always 40psi. I place an amp probe on fuel pump and saw...
1995 Chevrolet Cavalier 2.2L Surge, MIL Lamp on VIN: 1G1JC1242S
Alright it is fixed. I got several helpful replies. One said to verify good vacuum supply to map and a couple suggested ohming injectors. Vacuum was good and all 4 injectors checked right at 12 ohms. Someone suggested I verify good quality fuel in tank. All th... Trouble codes: 35 (IAC error).
1997 Chevrolet Cavalier 2.2L assist VIN: 1G1JC1245V
Well, this car seems to be fixed. Thanks to all who replied. David from Pennsylvania: I checked the belt and the tensioner. It all checked okay. The belt is only a couple months old. Kevin from New Brunswick: Since the car was in use most of the time by th...
1997 Chevrolet K2500 Cheyenne 7.4L Long crank hot VIN: 1GCGK29J1V
Well, many of you hit it on the head. I replaced all 8 injectors and that did it. Only 6 were actually leaking, some worse than others but the owner elected to do them all. Thanks for the info all who replied.
2000 Chevrolet Venture 3.4L Speed O meter VIN: 1GNDX03EAY
Thanks to the members who offered help. I had the IP.Reprogramed and that took care of the LOCK on the radio,had to have tech 2 to do the synchronizing.On the speed O problem I disconnected the computer thghtened all pins on both banks and tightened them. Then...
2002 Chevrolet Silverado 2500 HD 8.1L No Start, Hesitation, Surge, Cuts out, Stall VIN: 1GCHK23GX2
Thanks to the ten replies. All agreed it was probably the crank sensor. I attempted to catch it in the act with a lab scope and scanner watching data but never acted up. Installed a updated crank sensor and all is well.
1994 GMC Jimmy 4.3L No Start
FIXED! I hit the TB with propane on cold start and it busted right off. Fuel pressure would NEVER go above 52PSI max (had to resort to borrowed new fuel guage which read 6 psi lower than my old one-time for a replacement!) Guess lesson learned about these Vort...
1996 Oldsmobile Cutlass Ciera 3.1L Oil in coolant reservoir VIN: 1G3AJ55MXT
It is fixed. The oil was getting into the radiator, past the intake gaskets, but NO coolant in the oil! New gaskets, and check all the head bolts for broken ones was the fix. It has some time on it now, and is holding. Several members pointed out the importa...
1996 Oldsmobile Cutlass Ciera 3.1L Misfire
Thanks for being patient. I waited this long to make sure it was gone for good. It appears that the EGR valve intermittently sticky and leaking at closed position caused most of the symptoms. I double checked the injectors with a GM load tool and they passed b... Trouble codes: P0300, P0441.
1994 Pontiac Grand Am SE 2.3L No Start VIN: 1G2NE1530R
Yahoo! It is gone! Well, after reading all of your suggestions I started out with checking out the crank sensor. When I reached down to unplug the connector it fell apart, I mean flush with the block! I had to remove the intake to have access to get the rest...
2002 Saturn SC2 1.9L Stall, Misfire, MIL Lamp on VIN: 1G8ZY12712
Hello, This vehicle is finally fixed. Thanks to everyone that responded. Most of the help we received had already been tried. The fix was done in 2 steps. After running out of ideas and having tried everything all you good folks recommended, we called the Satu... Trouble codes: P0341 (CMP Out Of Range).
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