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Prev Professional Automotive Repair Technical Discussions for October 28, 2009
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Open Help Requests for GM
Help Request Answers
1997 Buick Century Custom 3.1L No Start
Got this century that is a good one. Kicks back violently on the starter when cranking. Once in a while it will crank up and run normally for a few seconds then spit and sputter and die out.Keeps setting code 1374 for 3X signal.Scoped the 3x signal directly at... Trouble codes: 1374 (3X signal intermittent)
1999 Buick Regal LS 3.8L Cuts out, MIL Lamp on VIN: 2G4WB52KOX
Hello to all and thanks in advance. I have this Buick here which I have been pulling my hair out on. I have been chasing two code for some time now p0133 and p1133. Car came in this summer with light on and both codes in it watched scanner O2 switching slow so... Trouble codes: P0133, P1133, P0171
2002 Buick Regal LS 3.8L Surge, Cuts out VIN: 2G4WB52K32
Vehicle surge/ cuts out at 45 mph plus. Vehicle in park RPM's will not go over 3 grand. Scanner shows loosing injector pulse and O2 sensors going south. Have tried alternative fuel. No difference. Have replaced ignition coil pack/ ignition module with known go...
1984 Chevrolet Corvette 5.7L canister leaks raw f VIN: 1G1AY078XE
I have this old vette here and it came in with fuel pouring out of the charcoal canister vent two weeks ago. I removed the sender/pump assembly from the fuel tank to check for leaking hoses and the possibility of a rotted gas tank. I noticed that there is a st...
1991 Chevrolet Corvette 5.7L Cuts out, Stall VIN: 1G1YY2383M
i got this car in i dont work on vettes but its my neighbors car so i try to keep neighbor hood happy the problem is the car will run and idle but when you try to give it any gas it dies no stumble just dies. if you keep spraying carb cleaner in it it will run...
1994 Chevrolet S10 2.2L Lighting VIN: 1GCCS1942R
This is a freebie pro-bono job I am doing at home for a neighbor. The initial complaint was that the brake lights weren't working. After I started to diagnose this thing, I soon found fist fulls of wires that were melted together that had to be replaced. There...
1998 Chevrolet Malibu 2.4L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1G1ND52T0W
This vehicle came in running very poorly. I have found various problems with several systems as you can tell by the repair history.(the exhaust cam was even off a tooth due the the tensioner malfunction) Now I have isolated a misfire and bucking going up hill ... Trouble codes: P0300, P0420 (catalyst efficiency below threshold), P0171 (lean bank 1), P0174 (rich bank 1), P0125 (excessive time to achieve closed loop), P1171 (lean bank 1 on acceleration)
2001 Chevrolet Impala 3.8L abs VIN: 2G1WH55K21
abs code c1233, right front wheel speed sensor. When you clear the code abs light will go off . As soon as you shift into drive the abs light comes on with code c1233. Test drive and all wheel speed sensors show the same mph. test rf sensor shows 980 ohms and ...
2002 Chevrolet Impala 3.8L Starting VIN: 2G1WH55K72
This customer has had this act up for her off and on for the last 6 mos. and never for me. The starter will not engage while holding the key to the start position for 8 to 10 seconds, once started it will kill, restart again, run rough then kill, restart again...
2003 Chevrolet Silverado 2500 HD 6.0L MIL Lamp on VIN: 1GCHC24U43
code for small evap leak used smoke tester and it revealed no leaks , the ftp sensor reads corectly and the puge system functions properly any ideas where to turnm now the gas cap is origonal but tested ok Trouble codes: P0442
2004 Chevrolet Suburban 1500 Z71 5.3L MIL Lamp on, VIN: 3GNFK16T24
we sent the customer on his way, thinking canister vent was the problem. customer came back, complaining he can not complete a fill up. pump pops back. we replaced the fill pipe assembly, it looked collapsed. it did not fix the problem. we have now dropped the... Trouble codes: P0446, P0442
2005 Chevrolet Tahoe LS 5.3L Charging VIN: 1GNEK13TX5
Vehicle came in with the complaint that the voltage meter would fluctuate and the headlights would dim. We replaced the alternator per the overwhelming evidence of problems with these. Unfortunately the gauge still fluctuates and at times the lights will flick...
2005 Chevrolet Equinox LS 3.4L Stall, MIL Lamp on VIN: 2CNDL23FX5
vehicle came in with s.e.s. light on and these codes stored u2100,u1000,p1626,u0140, u0121. vehicle does stall, when tried to restart, 1st time engine will crank will not start 2nd time will not crank, 3rd time cranks and starts. does not do it all the time. c... Trouble codes: P1626 (theft deterrant feul enable signal lost), U0140 (loss communication with bcm), U0121 (loss communication with ebcm), U2105 (loss communication with ecm), U1000 (class 2 serial data link)
1999 GMC K2500 Sierra SLT 5.7L m/c VIN: 1GTGK29U9X
Bled the system, used a quart of fluid, getting no more air air from calipers, still no pedal, does someone have the procedure to bleed the ABS on this vehicle, i cant find it. Thanks, Joe
2003 GMC Yukon XL 1500 SLT 5.3L Misfire VIN: 3GKFK16Z43
misfire cyl 2 at idle only off idle no miss fuel pressure 48 psi flow good swapped injectors and coils with no help vacuum steady machine shop vacuum tested valves and cylinder said no problems fuel trims 4 while misfiring any other help would be great Trouble codes: P0300 (random misfire)
2003 Other GM h2 6.0L Accessories VIN: 5GRGN23U63
Hell...Now it's my own vehicle that brings me here! My wife's H2 today decided to start spraying washer fluid from the washer intermittantly. It seemed to progress to full time and the rear wiper started to stay engaged for a while, ignoring commands from the ...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick LeSabre Custom 3.8L Misfire, MIL Lamp on
Thank you all for the help. After 31 years in business I should know better than taking in jobs that customers have worked on. I ohmed out injectors; all were between 12.9 & 13.5 @ 100*. Did compression test on #1 cylinder; 175#. Running compression - 125#.... Trouble codes: P0300 (Misfire).
2003 Cadillac Seville STS 4.6L ride control VIN: 1G6KY54943
I just wanted to thank everyone for there time. I ended up setting up 4 meters to read the resistance of the struts at the suspension control moduel. As I drove the vehicle I saw no change in readings. At that point I determand the controler had an interna...
1996 Chevrolet S10 LS 4.3L Stall, trans. shift VIN: 1GCCS19WXT
I up-dated my scanner, but no help. I figure replies were right about a glitch in scanner. I also noticed my scanner ask for vin code for correct 4.3 engine. So I went under other 4.3 and scanner read mph correctly.
1999 Chevrolet Silverado 1500 4.3L No Start, Poor Idle Quality, Cuts out, Stall VIN: 1GCEC14WOX
2000 Chevrolet Astro 4.3L power steering VIN: 1GBDM19WXX
It's difficult to say whether this was fixed or not. Here's what happened. It would appear that the system bled out ok. I spent a lot of time on the phone with cardone - the pump rebuilder's hotline - I managed to find a matching set of fittings in my fuel p...
2003 Chevrolet Malibu 3.1L brake pads VIN: 1G1ND52J93
well i took some advice & replace brakes w/oem mentioned to customer to watch how they use there brakes .dont ride pedal and mention the same to daughter thanks again for all the replies
2004 Chevrolet Impala 3.8L MIL Lamp on VIN: 2G4WB52K0W
Thanks for all the help. Special thanks to Jay [...] for working with me on this one. While spending endless hours trying to solve this, I happened to disconnect wire from splice pack for communication with abs module. After car sat overnight, the abs and trac... Trouble codes: U1040 (EBCM Communication Problem).
2004 Chevrolet Silverado 1500 LT 5.3L heat/cool controls VIN: 2GCEK13T34
as you guys stated, the aftermarket job did not use the proper connectors to adapt the system to work for the aftermarket stereo. and the cabin filter was plugged, feel dumb on that one. thanks again guys, I would have spent alot of time figuring out that on...
2005 Chevrolet Equinox LS 3.4L power assist VIN: 2CNDL63F35
First thanks to IATN and all they have done for the automotive industry We got the car fixed the first thing we done was replaced the column. That stopped the steering wheel from jumping back in forth when you turn then let up on it but it was still stiff and ...
1997 Oldsmobile Achieva S 2.4L No Start, passlock VIN: 1G3NL52T6V
The system that this car had is Passlock, with the lock cylinder supplying the signal voltage to the IPC to enable the PCM to fire the injectors. I took Eric's idea and sent the IPC back to the repair shop and asked the Tech to disable the Passlock system. The... Trouble codes: P1629, P1601 (loss of serial communicationdoesnt set all the time).
2000 Pontiac Grand Prix GTP 3.8L Stall VIN: 1G2WR121XY
First thanks to all who replied. Turned out to be a MAP sensor vacuum problem that was kinda weird. The vacuum harness had a tee at the manifold connection that feeds the supercharger actuator, fuel pressure regulator, and MAP sensor. There was a plastic vac... Trouble codes: P101.
2002 Saturn SC1 1.9L Hesitation, Cuts out, Stall VIN: 1G8ZP12862
hello thanks to all that responded. we stayed late last night to work on this car. this particular vehicle had both catalytic converters plugged. causing the egr to open fully with the back pressure. back preassure was 3 ps1 at idle and burried the guage when ... Trouble codes: P0403 (egr solenoid control circuit), P0405 (egr position sensor circuit loww volt), P0410 (air injection reactor management), P1620 (low coolant).
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