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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for July 11, 2008
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
2002 Buick Century Custom 3.1L Hesitation, Surge, Cuts out VIN: 2G4WS52JX2
This car under heavy accel it will cut out/ hesitate, feels just like a misfire. I tried new coils with no success. I checked fuel pressure KOEO 55 psi. Pressure down the road with problem happening is 50 psi. Seems that the hotter the vehicle gets the worse i...
1991 Chevrolet Lumina 3.1L Cuts out, Stall VIN: 2G1WN54TXL
This car starts and idles fine. But cuts out or stalls when the gas pedal is pressed. This condition only happens when the car is hot. I replaced the cat. convertor first because I thought it was clogged. Then I replaced the crank sensor to no luck. I hate gue...
1998 Chevrolet S10 2.2L no odometer VIN: 1GCC51449W
originally i had [...] on odometer and a complaint of the odometer flickering on and off and reading 0 all other gauges work correctly and no codes present (that i can access through my solus) I swapped the cluster out with 2 known good clusters both wer...
1999 Chevrolet Silverado 1500 4.3L Timing Chain + Transmission VIN: 1GCEC14W2X
1. Replacing timing chain; what is the function / purpose of the smaller gear behind the cam gear? Any special watchouts? 2. How do I access the torque converter bolts when removing the tranny. Thanks in advance for your assistance This is my father's truck ...
1999 Chevrolet Express 1500 4.3L No Start, Poor Idle Quality, Hesitation, Stall VIN: 1GCEG15W3X
Alright, here is what we have. This van came to us on a trailer, it barely ran good enough to get it into a parking stall. The customer claims to have changed the fuel pump, cap and rotor and probably some other items that he failed to mention to us. O.K. now ...
2000 Chevrolet Silverado 1500 5.3L Mechanical VIN: 1GCEK19TOY
Unit came in for spongy pedal problem with previous ABS problem. Customer had unplugged fuse for ABS and drove for awhile like that. When unit came in, customer informed us that brake pedal went spongy instantly. We changed master cylinder and bled multiple ti...
2002 Chevrolet Express 3500 6.5L No Start VIN: FX11195589
need help engine stalled will not restart 5volt ref ok to opp sensor. 12v to pdm ok grounds ok pin test harness ok. no fuel comeing out of pump to injectors.have rpm on crank 650rpm iam missing some thing please help
2002 Chevrolet Malibu LS 3.1L Engine Noise VIN: 1G1NE52J52
This is a doozey! Vehicle makes a whistiling noise when hot. Sounds like its coming from the upper intake area. Have been unable to pinpoint the cause of the noise. Checked PCV and hoses - OK. Sounded like maybe a sucked intake gasket, but when we replaced the...
2005 Chevrolet Impala 3.4L No Start, no spark or injector pulse VIN: 2G1WF52E05
this car came on a hook customer said tha the day before if had stalled on him, hard but it restarted,took it home,next morning it woud not start. Checked,no spark and no injector pulse.crank and cam sensor had good signal so I checked igition module with vant...
1994 GMC C1500 Sierra SL 4.3L Front Seal VIN: 1GLPC14ZOR
Hey Everyone,Thanks For Taking Time To Help.Truck Came In With Front Seal Leaking In Trans Leaking.Replaced Seal Yesterday & Finished Job At End Of Day And Ran For Awhile To Top Off Fluid And Seal Was Ok (No Leak).This Morning Ran Truck For Awhile Just To Doub...
1998 GMC C-7500 7.2L Will not crank via ignition switch VIN: 1GDM7H1C8W
Orange-black wire at starter relay goes to ignition switch crank terminal electrically-changes colors per wiring diagram and what I can see. Per diagram there is ether start unit [super chassis only-- ? what that is]. I have removed the starter relay-problem s...
2004 GMC Sierra 2500 HD 6.0L 4wd hi VIN: 1GTGK23U84
this transfer case has no 4wd hi, 2wd operates, 4wd low operates but when 4wd hi light is on it's only in 2wd, can hear encoder motor operate in each mode selected. voltage changes in each mode, no codes, no blinking lights and can communicate with atm, suspec...
1995 Saturn SL1 1.9L MIL Lamp on VIN: 1G8ZH5280S
hey saturn guys this is my 2nd saturn i have worked on and need help. car came to me codes 12 13 26 32 drives good just has vibration at idle im trying to get light off for smog i did some reading on mitchel and in archives i replaced purge soleniod up above s... Trouble codes: 12 (normal), 13 (0 2sensor), 26 (quad driver), 32 (egr)
1995 Saturn SL1 1.9L Stall VIN: 1G8ZG5286S
This car runs fine. when the A/C is turned on the pump cycles rapidly at idle. If you speed the idle up it quits cycling and stays on. The main concern is when you pull up to a stop sign the engine will idle clear down and die. It starts right back up. The EGR... Trouble codes: 32 (53 -), 53
1996 Saturn SC2 1.9L Surge, Stall, MIL Lamp on VIN: 1G8ZG1273T
hi all. got a good one here. saturn will surge on start up then fuel pressure will continue to drop until almost stall then relay will kick in engine will rev and repeat cycle until ??? sometimes it runs fine. alternator output will go up to 18 volts during su... Trouble codes: P0563, P1599

Fixes & Summaries for GM
Fix/Summary Answers
2003 Buick Rendezvous CX 3.4L lr speed signal VIN: 3G5DA03E53
OK we found the problem. After thinking overnight and reading all the replies we decided to check the wiring harness in the engine compartment. Got air filter and and PCM housing out of the way. Followed the wiring from EBCM to engine harness and found wiring ...
1996 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD52Y9T
Replaced the fuel pump and vehicle was fixed, Thanks Trouble codes: P0131, P0138, P0151, P0171, P0174, P1139 (ho2s b-1 s-2 insufficient switching).
1995 Chevrolet Camaro 3.4L Misfire VIN: 2G1FP22SXS
Well techs, this camaro is fixed. It did have multiple problems. As stated before, one fuel injector was bad. Replaced that fuel injector. Ended up pulling the heads, valve seals were shot and the valves especially on number one cylinder were carboned up badly...
1997 Chevrolet C1500 5.0L 2-3,3-4 shift VIN: 1GTEC14R2V
Well the fix turned out to be the moulded 3-4 clutch piston that was not sealing in the drum. Visually it appeared fine but it was blowing by the outer sealing area. The original -during overhaul- aircheck was done with full shop air pressure. With regulated a...
1998 Chevrolet K2500 Cheyenne 5.7L brake pedal VIN: 1GCGK24R7W
I continued to bleed the system and never got any air however the pedal finally came back to an acceptable level. Still not wonderful but customer is happy, thanks for all the help.
1999 Chevrolet Venture 3.4L door locks VIN: 1GNDX03E4X
I pulled up the carpet under the front seat it all looked good there was no water or corrosion on the wires. When I went home that night I left the bcm unhooked so the locks wouldn'd acctivate all night and run the battery dead. When I came back the next morni...
2000 Chevrolet Cavalier 2.2L compreesor VIN: 1G5839T452
would like to thank everyone how helped .the IATN guy how suggest no are flow were wright the cooling fan is not working replaced cooling fan and all is well sometime we all over look things thanks again.
2002 Chevrolet Silverado 1500 4.3L MIL Lamp on VIN: 1GCEC14W62
What a nightmare, We did have to modify the dist. hold down clamp to get the CMP retard close to 0 degrees, we tried multiple settings from zero to plus or minus 3 degrees and we must have done the relearn 50 times. This needed to be done but did not fix my p... Trouble codes: P0300 (1 and 4 misfire since we changed the cam).
2004 Chevrolet Colorado LS 2.8L drum/shoes VIN: 1GCCS14884
Sorry for the length I took to close this, I just wanted to make sure the vehicles were fixed. It seems the napa premium shoes are too tacky and grabby. Also the adjusters need to be replaced and modified respectivly per bulletin. The napa standard shoes and d...
1999 GMC Jimmy SL 4.3L always in 4wd VIN: 1GKDT13W8X
Thanks to everyone who replied to my request for help. Most said it was the transaxle control module, and they were right on. Replaced with a used unit, indicator lights and 4wd work perfect. DTC cleared on their own, test drove over two days, O.K. Thanks agai...
2000 GMC Safari SL 4.3L Poor Idle Quality, Hesitation VIN: 1GKDM19W8Y
THANK FOR YOUR REPLIES GUYS. The problem was in the fuel pump lines hookup. somebody changed the fuel pump before and they crossed the evap lines with the return one( both are the same size). so whenever the purge solenoid is activated, it sucks gas from the g...
1997 Pontiac Grand Am SE 3.1L engine oiling/ valve train VIN: 1G2NE12M9V
Removed oil filter and found metal particle's in and on filter. Spun bearing's in either cam or crank? Therefore i presume the oil pressure was low the whole time and not high, causing internal ware. Offered fix of motor replacement to customer, and customer d...
1998 Pontiac Grand Am SE 2.4L Misfire VIN: 1G2NE12T0W
Thanks for all the help on this on. I replaced coil cover with an ac delco one and replaced plugs with ac delco ones and now all is well. Theres just some things you can not try and go cheap with. Thanks again Lee
1999 Saturn SL1 1.9L Rear brakes VIN: 1G8ZH5289X
Most of what we found was that the r side park cable we got from napa had internally fallen to hell, whereby there was a grinding sensation in the park lever when we'd apply the park brake. The cable sheath apparently prematurely ate through so the cable was r...
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