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Prev Professional Automotive Repair Technical Discussions for January 11, 2006
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Open Help Requests for GM
Help Request Answers
1999 Buick LeSabre Custom 3.8L Misfire
I have replaced spark plugs--still have miss fire on #4 tried new wire and new coil. scoped the wire secondary pattern is way different than the ones firing good..Question is can the ign module cause a miss fire under load but fire good at idle? it really sou... Trouble codes: #4
2003 Buick Century Custom 3.1L Wont take fuel VIN: 2G4WS52J23
I don't like to post without hands on but this seems to be open and shut as far as the symptom.Slow fill...Kicks the nozzle off.Ive been into a few of these and the filler neck has been the problem but I realise theres more to it than that.I can cycle the vent...
1988 Cadillac Seville 4.5L air mix door VIN: 1G6KS5155J
I can check body data BD24 air delivery mode and its no.4 off,how do you operate the air delivery?
1995 Cadillac Seville SLS 4.6L Misfire VIN: 1G6KS52Y1S
This car has a misfire under a load. It seems worse when hot. It has new plugs, wires & have replaced coils with known good ones with no change. I have checked crank sensors & they check good. The misfire feels like the ignition breaking down. Maybe not. Could...
2002 Cadillac DeVille 4.6L suspension VIN: 1G6KD54Y92
This caddy is really a deusy. Customer brought new hubs for us to install, which we did. He didn't tell me about noise until after we installed the new hubs. He said a dealership told him it needed hubs. Anyway, the car has a thumping\poping noise when rolling...
1969 Chevrolet C10 5.7L Blows Gears VIN: CS149B8458
Customer brought this converted 1969 Chev pickup into me to see if I could repair his problem. Let me start off by saying this is a 1969 Chevy pickup with a 1996 5.7 LT1 and a 4L60E behind it. The engine has a LT1 Hotcam with headers and a custom programed vcm...
1993 Chevrolet Lumina Euro 3.1L lots of codes VIN: 2G1WN54T5P
car came in running connected car to scan tool has multiple codes and they come and go and changed as long as on scan tool... has false readind or no reading at rpm ... customer says sometime hard start or no acceleration
1996 Chevrolet G30 Chevy Van 5.7L Unknown VIN: 1GBJG31K6T
Thank you for your help. About a month ago one of our fleet customers brought in a van for the rear wheels locking up and the vehicle fish tailing on occasion. Happend 3 times in a couple of week period. Usually happens after driving 10-15 miles on the highway...
1997 Chevrolet Blazer 4.3L engine VIN: 1GNDT13WZV
Hello fellow technicians. I have a problem with this vehicle that has been haunting me for 3 days now. Initially, the vehicle came in leaking oil and coolant. Numerous leaks were found, but the customer only opted for the oil cooler/remote filter lines and the...
1999 Chevrolet Express 1500 5.7L Not sure VIN: 1GBFG15R5X
Power steering at idle is about 40%. If you rev off idle it feels normal. We did not have a pressure gauge to ck pressure but felt it was in the pump. We replaced the pump and did not fix. We went to dealer and borrowed the pressure gauge and it test with in s...
1999 Chevrolet Astro 4.3L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GCDM19WOX
when vehicle came back recheck for codes only code p1870. recheck cam retard reads -60 at idle. what is causing the cam retard to go crazy. Trouble codes: P1870 (trans slippage), P0420, P1345 (cmp/ckp syncronation problem)
1999 Chevrolet Blazer 4.3L Hesitation, Surge, Misfire, MIL Lamp on VIN: 1GNCS13W6X
Normally I don't work on Blazers, but my customer brings his Benz here and called me about his frustrating problem. The vehicle continues to set a random missfire code. I got the vehicle yesterday and proceeded with basic missfire diagnostics. CEL was not on, ... Trouble codes: P0300 (testing and results)
1999 Chevrolet Silverado 1500 5.3L MIL Lamp on VIN: 2GCEK19TXX
Thanks in advance for your time. This truck came in with MIL on. Was running OK. It had lean codes, both banks. Test drive was OK. Long term fuel trim +25 both banks. IAC counts very low. Tested fuel system. Pressure OK, flow poor, waveform on pump motor very ... Trouble codes: P0171, P0174
2001 Chevrolet Prizm 1.8L engine VIN: 1Y1SK52831
The problem I have with this car is oil consumption. Customer states it uses about 3 quarts a week, Comp test good 155 psi on all 4 cylinders air cleaner is new, hoses are clear, pcv valve has been replaced, no oil in air box, This car does not smoke, no fuel ...
2001 Chevrolet Silverado 2500 6.0L Misfire VIN: 1GCHK29UT1
Hey guys, Got a Chevy here thats a little odd. We replaced the engine in this truck and have had a missfire since then. It is a fleet vehicle so no one knows if it is a preexisting problem or not. We flushed the injectors, that lasted for 2 weeks then #4 miss ... Trouble codes: P0300 (Random), P0303 (3 miss), P0304 (4 miss)
2002 Chevrolet Express 2500 5.7L No Start VIN: 1GCGG25RX2
Vehicle was towed in crank no start found water in distributor cap no external cause,have recently found this problem in many other gm v6 and v8 engines,one email suggested the problem is from the distributor vent and that he is going to try blocking it off,my... Trouble codes: P0300
2002 Chevrolet Malibu 3.1L back up lights VIN: 1G1ND52J22
This one blows fuses intermittently. It's the 10 amp back up light fuse. It seems to do it when shifting into reverse at times. I was hoping somebody may have ran into this before and could point me in the right direction. I've checked the fix database and cou...
2003 Chevrolet Malibu 3.1L MIL Lamp on, guages go out VIN: 1G1ND52J23
we dont have any info for this car but for the first two codes PO443 and PO449 and went thru the tests and it seams like those systems are working fine has anyone run into the other codes and could they all be related together any help would be nice thanks in ... Trouble codes: P0443, P0449, B2600 (daytime running error), B2602 (DRLrelay output shorted to ground or open), B1379 (ign 3 imput), P1585 (CC inhibit ckt CC lamp control ckt)
2000 GMC Yukon SLT 5.3L No Start VIN: 1GKEC13T3Y
Truck will sometimes crank start and shut off, when it does this the interior lamps, drivers door unlock relay, auto headlamps, door and keyin chimes and dash guages fail to work. Module status shows BCM fails to communicate with scanner. Followed information ... Trouble codes: P1626 (theft deterent system-fuel enable circuit), U1000, U1064 (Lost comm), U1016
2001 GMC Sierra 2500 HD SL 8.1L Cuts out VIN: 1GTHK24G61
This truck is very bizzare. I have scanned and found nothing wrong. Fuel pump is new with in 4 months and fuel pressure in normal and when it does cut out it does not act like a fuel starvation issue. It seems more like a quick key shut off and restart. When i...
1999 Pontiac Grand Prix SE 3.8L Surge VIN: 1G2WJ52K4X
Hello everyone, I have a Grand Prix that is surging smoothly between 50 and 60 m.p.h. When you lightly accelerate anywhere between these speeds after you have already started to cruise the vehicle surges back and forth. All the data seems to follow up and down...
2000 Pontiac Sunfire SE 2.2L No Start, MIL Lamp on VIN: 1G2JB1248Y
customer complains high beams don't work and D.R.L. light flashes in drive, and when car is shut off and key out of ignition, check engine light will flash one time after aprox. 15 sec. and after car sits a awhile car will crank and won't start. I found shorte...
2000 Pontiac Bonneville SE 3.8L Stall VIN: 1G2HX54K8Y
Customer complaint of vehicle die after start up. It also wanted to died one time going down road. I have found that vehicle will start and when it wants to die will do it right after it starts. May do it 2 consecutive times in a row then it will run fine. Som... Trouble codes: P1626 (Theft Deterent System SIgnal)

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick LeSabre Custom 3.8L radio clock VIN: 1G4HP52L4R
Greetings Brother Techs... removing the radio from the line eliminated draw from the battery ...radio has subsequently been replaced. Problem solved..customer happy. Thanks for all of the replies!! [...]
1998 Cadillac Seville STS 4.6L alternator VIN: 1G6KY5491W
We were on the right track with the battery temp thermister. We ordered in a new resistor and compared resistance values between the two. New part at room temp- about 77 deg. 1.6k ohms and the old resistor was at 2.5k ohms. This sends a voltage back to the alt...
1993 Chevrolet C1500 Cheyenne 4.3L MIL Lamp on VIN: 1GCDC14Z3P
Thank you for all the advice guys. Robert had it right.I replaced esc module off of another truck on lot.Test drove with scanner after clearing code 43,after 20 miles no MIL light.Replaced module w/new delco.Customer is happy,me too!Thank you everyone,lots of ... Trouble codes: 43 (esc module or sensor problem).
1993 GMC K1500 Suburban SLE 5.7L front differential VIN: 1GKFK16K6P
Thanks to all who read and replied. The fix for this was a lock ring at the rear of the transfer case. It very well could have been a lock ring in the differential also from what most of the replies mentioned. It may have been easyer to find if I had not had t...
2000 GMC Yukon XL 1500 SLE 5.3L heater VIN: 3GKFK16T4Y
Well 8 out of nine said to flush or replace the cores so thats the direction we took. We got some 'heavy duty' cleaner from the GM dealer(P/N [...]) , pulled both coolant plugs in the block and let it drain completely.The right side hole was completely plug...
2002 GMC Savana 1500 5.7L Misfire, MIL Lamp on VIN: 1GTFG15R32
we have the van fixed it did end up being the cap was crossfiring on 1 and 3 we replaced the cap and it runs good the cap that was on the van was 1 week old so we had a bad new part thanks for all your help on this repair Trouble codes: P0300.
1999 Oldsmobile Intrigue GLS 3.5L engine VIN: 1G3WX52HXX
Thanks for your help and suggestions. Further exploration revealed that the balance shaft and its bearings were the cause of the noise. The oil pressure was indeed ZERO when warm at idle. The customer has purchased a salvage yard engine (found through www.car-...
1995 Pontiac Grand Am SE 2.3L engine and trans swap VIN: 1G2NW15D95
The customer has agreed that this swap is not worth the effort or dollars involved. I showed him your best advice, which I greatly appreciate. We don't need any more nightmares.
1999 Pontiac Sunfire SE 2.4L engine VIN: 1G2JB12TXX
Thank everyone for repling to my help. I have replaced the engine in this vehicle. I was unable to find the noise, even though I thought it was in the intake cam area of the cylinder head. The customer thought that it would be better to go with a used engine i...
1999 Saturn SL2 1.9L Hesitation VIN: 1G8ZK5277X
1 and 4 plug wires crossed at coil pack,corrected wires and problem gone should have looked at this but it ran well for having crossed wires Trouble codes: P1599 (stall or near stall).
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