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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 21, 2008
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Open Help Requests for GM
Help Request Answers
1991 Cadillac DeVille 4.9L leaking brake hoses after new installed VIN: 1G6CD53B3M
This is certainly not the first time, I've noticed that we have a hard time getting the brake hoses to stop seeping after replacement. Sometimes new washers come with the brake hoses, sometimes not. Even though, on this vehicle we had to re-install the old wa...
1999 Chevrolet Corvette 5.7L Mechanical VIN: 1G1YY32G3X
Car came in run no go (trans) Cust told needs flywheel. As far as I can make out, engine output seems there. It's like the driveshaft coupler in broken?? I can spin the T/Q by hand. I don't hear any noise. No codes and weird. I have not pulled apart anything. ...
2001 Chevrolet Impala LS 3.8L abs VIN: 2G1WH55K81
While test driveing I hear and feel the ABS motor run very intermitenlyn sometimes with out touching the brakes, No codes, and wheel speeds do not drop out. I don't have any service information to follow, can anybody share with me what testing procedure to tak...
2002 Chevrolet Impala 3.8L No Start VIN: 2G1WF55K82
hi every one i have a wierd one i just wanted to get some idears before i get into it the car came in with a dead battery we charged the battery car started the ck engine and securty light was on along with the charg light the radio was locked ck charging syst...
2003 Chevrolet Suburban 1500 LS 5.3L MIL Lamp on, reduced power VIN: 3GNFK16Z43
Truck came in, customer stated vehicle went into "reduced power" mode. Parked overnight next morning battery stone dead. customer charged battery, drove to shop and said it worked fine. We plugged in scanner, no codes of course, but noticed key on engine off d... Trouble codes: P1518 (TAC Module)
2003 Chevrolet Silverado 2500 HD 8.1L Poor Idle Quality VIN: 1GCHK24G73
This is the first time truck is running since the accident. Upon startup with all codes cleared it stumbles around for a bit then the park brake light comes on and the engine goes to a high idle (aboout 1600 rpm) and sets a mass air sensor performance code, bu... Trouble codes: P0101
2004 Chevrolet Suburban 1500 LS 5.3L No Start VIN: 3GNFK16Z94
Hi all This one came in on a Sunday no start. On Monday a.m. started right up and drove into shop then no start. No mil - Checked voltage 12.61 - spark ok - checked for fuel at regulator none present - fuel pressure below specification - While checking fule pr...
2005 Chevrolet Impala 3.4L fuel odor VIN: 2GIWF52E75
i have this impala customer complains of fuel odor inside the car when he gets in the car first thing and also some times when it sits for a while he claims it is more noticeable inside car rather than outside there is no apparent fuel leaks i smoked tested ev...
2006 Chevrolet Silverado 1500 LS 5.3L encoder motor VIN: 2GCEKL13TO
This is less of a help request and more of an informational post. We had this truck in that poped out of gear in the t case. Fluid was clean and it did have the encoder position code present in the cpu. We foud a bullitin on reprograming the computer but nothi...
1990 GMC K1500 Sierra 5.7L No Start, Stall VIN: 1N6ED27Y21
Let me preface this by saying I have no idea why somebody would bring their Chevy truck into a Nissan dealer, but here we are and here I am trying to figure this thing out. It dies randomly and sometimes it will restart sometimes it won't, when it won't resta...
1997 GMC Sonoma SLE 4.3L Red Brake Warning Light stays on VIN: 1GTDT19X5V
I not sure what direction to go with this... Truck is back in here with a Red brake warning light. The ABS light is not on; But, I do have a code C0026 Left front Dynamic Sensor. I tried to reset; but came right back; still no ABS light Test drove with scanne...
1999 GMC K1500 Suburban SLE 5.7L Battery VIN: 1GKFK16R3X
Car sat for 1 week before they picked the car up. The battery was dead, after charging, checked for current drain, none. Charged battery up, left sit again over night, dead again the next morning, checked again for amp draw, none, before parking for the night ...
2001 GMC Yukon Denali 6.0L engine light VIN: IGKEK63U51
check engine light comes on once every couple weeks and goes off on its own before the customer can make it in. this has been a problem for several months. i have never found anything in the history codes. now i have power at the dlc but cant get my genesis to...
1995 Oldsmobile Aurora 4.0L MIL Lamp on VIN: 1G3GR62C8S
Came in with mil light illuminated on Friday afternoon, scanned(80 and 109-PCM keep alive RAM reset)& cleared but 80 stayed. Car left and returned next week for repair. Rescanned, cdes 30 and 80 present. ISC actuator was replaced for sticking and racing engine... Trouble codes: 30 (ISC actuator slow or inoperative), 80 (TPS idle learn incomplete)
1999 Oldsmobile Alero GL 2.4L anti-theft VIN: 1G3NL52TXX
hello members, i have a 1999 olds alero/ 2.4l. vehicle is a no start, i have fuel, spark & injector pulse. i'd scan vehicle for codes, none, but not able retrieve data or codes from bcm i'd performed (passlock reprogramming auto learn) system is not reset...
1989 Pontiac Firebird 5.0L Cuts out, Misfire, MIL Lamp on VIN: 1G2FS21E4K
Hello to all- This Firebird is well cared for and runs well for the most part. there is an intermittant noise from the dist. that sounds like the upper bearing may be worn, but the major issue is that on acceleration, as in merging onto the highway, or passing... Trouble codes: 32 (EGR error), 34 (map), 43 (ESC Failure Knock Sensor)
1993 Pontiac Bonneville SE 3.8L Cuts out, Misfire VIN: 1G2HX53LXP
fellow techs i have an intermittent stall out and a misfire that take place at any time. the engine can be cold or hot, the stall out, when it occurs always happens after deceleration,(turning a corner) and then stepping on the gas. the engine will start right... Trouble codes: 17 (spark reference problem), 18 (camshaft crank error)
1996 Pontiac Firebird Formula 5.7L Cuts out, Stall, Misfire, MIL Lamp on VIN: 2G2FV32P0T
This T.A. runs like a scalded dog until you drive it for about 20-30 min. It will then slowly start to develop a misfire. At idle in gear it feels like just one cylinder. Upon accelleration, the misfires become more severe and exhaust backfires start. If you f... Trouble codes: P0300 (multiple misfire), P1361 (di low resolution circuit)
1999 Pontiac Grand Am SE 3.4L Fuel Gauge VIN: 1G2NE52E6X
Hi there & thanks in advance.I replaced a 3.4 engine on this vehicle only for the customer to bring it back for fuel gauge & odometer inoperative after repair.Sender,IPC,BCM & PCM have all been replaced..Im not seeing the engine replacement & these two problem...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Buick Park Avenue 3.8L dome,door,lights VIN: 1G4CW52K8T
This problem is on my book keepers car, I had her positioned her seats and I pulled the fuse so she could least drive it with out batt. going dead, since then she "can't do without it" sooo if I ever get it back for the repair! I will post the fix. Thank yo...
1992 Chevrolet Lumina Euro 3.1L No Start, Poor Idle Quality, Surge, Misfire VIN: 2G1WN54T3N
Hi all I thank you all. Most responses were leading to crank sensor. What I found the next morning was wires from crak sens. to control module oil soaked and bare insulation. Repaired . Kept another day and drove again and are returning to customer tommorow. A...
2000 Chevrolet S10 2.2L Surge, Misfire VIN: 1GCCS1958Y
thanks to all that have responded iatn is one of the best tools in the shop!!! It turned out to be the pcm. We drove the vehicle with a pressure transducer hooked up to the fuel rail and when it acted up you could watch the pulses in the rail raise when the in...
2002 Chevrolet Venture 3.4L No Start, Stall, Misfire VIN: 1GNDU03E62
Hey guy's thanks for all the help. Some may know but I found that this vehicle has TWO crank sensors. One for the PCM and one for the ignition module. I checked the crankshaft pulley sensor for A.C. voltage and it was o.k. Then I checked the A.C. Voltage at th... Trouble codes: P0300.
2003 Chevrolet S10 4.3L Fuel Gauge VIN: 1GCCT19X93
First Thanks to Lee,David,Nathan,Joseph,Kenneth,Ron,Alex,& Chester,Most nail it it was an open on the purple wire, I went ahead and replaced the wire like David suggested. Went ahead and replaced the pigtail on pump also ,thanks for the # Nathan [...] Marty
1997 GMC Yukon SL 5.7L belt / pulley VIN: 1GKEK13ROX
Thanks for all the replies. A lot of you hit it right on the head. The customer had a ps pump installed a while back by another shop. They did not press the pulley on flush, only 1/8 inch out but it was enough to make it squeek. I pressed it on flush and all...
2003 GMC Envoy XL SLE 4.2L MIL Lamp on, NO ACCELERATION VIN: P336225221
The only time this vehicle malfuntioned is in the extreme cold. Replaced the accelerator pedal sensor and all is good so far. thanks for your help... , MIKE.. Trouble codes: P1125.
2005 GMC Envoy SLE 4.2L transfer case VIN: 1GKDT13S55
Thanks to those who replied . it was the clutch pack that was worn , the fluid was a bit dark but not totaly black . i disassembled the case and found the clutches were worn ( just to look at them they looked ok but wth 18 disks 0.001 were will make them not ...
1998 Oldsmobile Intrigue 3.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G3WH52K3W
well i didnt get and oppertunity to fix this vehicle but what i did find was the warpage of the intake near the t body and also resmoked tested and found evidence of intake gasket leakage.I recomkmended to the customer that we remove the upper plenum and inspe... Trouble codes: P0102, P0171.
2000 Oldsmobile Intrigue GX 3.5L Hesitation, Misfire, MIL Lamp on VIN: 1G3WH52H8Y
As many of you suggested, it was a MAF sensor issue, removed & cleaned sensor, road tested vehicle multiple times with no problems, guess I overlooked the obvious on this one. Thanks again for the replies, much appreciated. Trouble codes: P0131 (O2 signal low B1S1), P0137 (O2 signal low B1S2), P0300 (random cylinder misfire detected).
1996 Pontiac Bonneville SE 3.8L No Start VIN: 1G2HX52K3T
We replaced the fuel pump relay & the customer has had the vehicle for three weeks with no problem. One help [Michael fr Oklahoma] came through with inspect relays in convenience center below passengers glove box. They can buzz at times & terminals may become ...
2004 Pontiac Grand Am SE1 3.4L security VIN: 1G2NF52E14
first time vehicle was in shop,so had no history on it. Battery was new but was not holding charge so we replaced the battery. That was first thing to do. Customer has not called since with any problems.
2000 Saturn LS2 3.0L No Start, Poor Idle Quality, MIL Lamp on VIN: 1G8JW52RXY
SORRY IT TOOK SO LONG TO CLOSE THIS... WE REPLACED THE CRANK POSITION SENSOR AND SINCE THE VEHICLE HAS LEFT THEY HAVE HAD NO FURTHER STARTING ISSUES. THANKS TO EVERYONE THAT HELPED US OUT ON THIS!! Trouble codes: P0727, P0335, B (crank sensor-no engine speed detected), P1780 (trans code- unkown- seems to be related to not signal to or from ecm).
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