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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for April 24, 2009
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1994 Buick Park Avenue 3.8L Anti-Theft Module VIN: 1G4CW5214R
Car was towed in after the owner replaced the Ignition Switch because of a no start condition, it still starts and runs for a second or two then dies. I tested his old key circuit at the anti-theft module to have 522 ohms, new key is the same. I pulled the plu...
1994 Buick Century Custom 3.1L siezed sensor VIN: 3G5AX54T3R
This vehicle came in as a no start, after doing checks found it was crank sensor. the problem is not the diagnosis but when I went to take it out it was siezed in the block and of coarse broke off. What a wonderful spot to get at. I have spent the last day try...
1998 Buick LeSabre Custom 3.8L Stall VIN: 1G4HP52KXW
Customer complains of intermittent stall. Starts again, but sometimes it starts hard.Scan tool shows a couple things I'm concerned with.LTFT sometimes at -20 or more. MAP sensor voltage .6V on scan tool yet a backprobe to the pcm connector shows 1.7V. ALLDATA ...
1990 Chevrolet Cavalier 2.2L Stall VIN: 1G1JC54G5L
Vehicle presented with stalling after long drive ( 1 hour plus) after test drive feels like transmission is not down shifting at stops vehicle bucks and stalls. manually dropping transmission into second gear seems to help but still have to power brake in orde...
1997 Chevrolet Malibu 3.1L Surge, MIL Lamp on, SURGES AT IDLE ONLY VIN: 1G1ND52MXV
this car has an erratic idle problem. starts and runs great until it goes into closed loop. then, idle surges rapidly as long as you sit and idle - will stop when put in gear. only very seldom will do it at a long red lite., fuel trims go to -18%, o2 shows ful... Trouble codes: P0300 (multiple random misfires)
1997 Chevrolet Camaro Z28 5.7L Clutch VIN: 2G1FP32P5V
i hope someone can help me, my customer just bought this car in arizona & drove back to south dakota. on the way home approximatly 150 miles into the trip he started hearing a buzzing or whirring noise coming from somewhere in the shifter area. if he shut the ...
1998 Chevrolet Malibu 2.4L Excessive Emissions, Poor Idle Quality, Misfire VIN: 1G1ND52T3W
Hello GM tech and thanks ahead of time. I am a FORD tech and thought I knew GMs , but this one is killing me! I have a 9-98 Chevy Malibu with a 2.4 and it runs like crap. Code present is P0300, idles terrible but runs OK down the road. At idle it also smells,... Trouble codes: P0300 (Random mifire)
1999 Chevrolet Silverado 1500 4.3L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy
truck came in no start fuel pressure good and did not have spark, checked vehicle had code for high voltage at ignition module checked did not have crank reference from pcm. crank reference to pcm from crank sensor good ohmed wire no short or open replaced pcm... Trouble codes: P0321
2003 Chevrolet Trailblazer North Face 4.2L rear ac&heater VIN: 1GNET16S03
what is the best way to replace the engine does it come out the top or do i have to pull the body off the frame? Help Its calling for 20 hours in the book. ive done lots of motors but never like this on. any help would greatly be appreciated. this is my first ...
2003 Chevrolet Suburban 1500 LT 5.3L No Start VIN: 1GNFK16Z53
this vehicle is driving me crazy. The vehicle was towed from another shop that put an ignition switch in the vehicle hasn't ran since. I started with the basics i hooked up my tech 2 and had a po1518. i found a bent over terminal in the new ignition switch fix... Trouble codes: P1518
2008 Chevrolet Impala LT 3.9L engine VIN: 2G1WC58388
hey guys i got a problem with this car that came in with engine noise lifter like noise . we checked the oil pressure came out to 38 psi. took it to the local chevy dealer for further diagnoses. dealer recomended tear down of vehicle est of $1200.00. at this p...
2006 Hummer H3 3.5L Starting VIN: 5GTDN13636
Hello iATN Customer brought the vehicle a few days ago, he mentioned that he had washed the engine compartment, with a garden hose at medium pressure. The vehicle arrived, but the engine was stumbleing as if it were mis-fireing, checked for codes, and there w...
2000 Pontiac Montana 3.4L compressor seal VIN: 1GMDX03E3Y
has anyone had good luck replacing front a/c compressor seals on this model. a/c system was empty evac and recharge and a/c worked good but then noticed hissing noise from front of compressor, i havent done a front seal for years but was curious if anyone has ...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Cadillac DeVille 4.6L traction control VIN: 1G6KD52Y3T
Thanks to all who responded. I replaced the ebtcm,and all lights went out and the traction button in the glove box seems to operate the off and on now.vech now pulls off in 1st gear like it's suppose to. I really thank every who responded because that ebtcm is...
1985 Chevrolet C20 Scottsdale 7.4L clutch VIN: 1GCGC24WXF
Howdy!!! this one is fixed and gone!!! I just did what George [...] told me to do: To get one of those oilers that you pump with the thumb, fill it up with brake fluid, connect a little hose to the spigot, open the bleeder, hook up the hose to the bleeder,...
1986 Chevrolet Camaro Berlinetta 2.8L Cuts out, Misfire VIN: 1G8CT18B6E
Well thank you to all iATN members especially those who responded to my pleas for help. What I found was shorted injectors, at least 2. I did kind of short cut checking the resistance by checking the batch in one test per bank. Right bank came up with 5.9 ohms...
1989 Chevrolet Camaro Iroc-Z 5.7L Fuel Guage VIN: 1G1FP2187K
Thanks for the help. Replaced gauge in instrument cluster and it is fine.
1994 Chevrolet K1500 Suburban Silverado 5.7L brake pedal drop VIN: 1GNFK16K7R
Thanks for all the help. The fix was to replace the abs unit with a used one. The owner opted for the used one after hearing the cost of a rebuilt unit. The help I recieved lead me in the right direction to test and repair this problem. The tool (j39177) to ho...
1995 Chevrolet Blazer 4.3L brake and signal VIN: 1GNDT13W2S
i checked my voltage and it was right so what i did was puta mutifunction switch on it sill no lights. customer put flashers on it,so i put 2 more on it they went to working, put old switch back on no lights so it took 2 flshers and a switch and 4 head ack pil...
2001 Chevrolet Express 2500 4.3L ABS Electrical VIN: 1GCFG25W31
After some time with the scope attached to various points, both ends of both wires PCM to VSS, and one VSS, PCM to EBCM found interference in these circuits. We removed the loom, and the braided cover around the main harnass over the top of the air intake tube...
2002 Chevrolet Silverado 1500 5.3L 4x4 VIN: 1GCEK19V62
What i learned was that from 1998-2002 there was 100lbs of preload on the clutch pak. Starting in 2003 because of front differential bearing issues they changed the design and used a 36lb. preload on the front yoke so that the front differential will live long...
2004 Chevrolet Silverado 2500 HD 6.0L driver info center controls VIN: 1GCHK23U74
Thanks again to my IATN buddies this truck is down the road! Now for the bad part of this ! The fix was to flash the dash again,for which the Chevy service writer charged our shop again. The repair ticket from the first time stated this was a new IPC and need...
1990 Geo Tracker 1.6L 1-2 shift VIN: 2CNBJ18U3L
Not sure what caused it. Customer decided to have a used transmission installed.
1997 GMC Sonoma SLE 4.3L No Start VIN: 1GTCS19W1V
Hi everybody, thank you so much for all the helps you are really great, everybody directed me to the correct problem, after checking the fuel pressure regulator valve and found no leakage i decided to buy complete fuel pump for vortec engine and installed it a...
2002 GMC Sierra 2500 HD 6.0L reverse VIN: 1GTHK29U72
thanks to everyone who replied, the reverse servo piston was bad, thanks for all the support and hopefully i can provide as much info to u guys that u have sent me, sincerely Chad [...]
2003 GMC Safari 4.3L Flex Plate VIN: 1GKDM19X93
Thank you all for the replies. John and Richard [...] think nailed it on the head. The first replacement flex plate was an OEM part and it was torqued to specs. The dowel pins where there and nothing was pinched in between the trans and engine and all bolts wher...
2000 Pontiac Grand Prix GT 3.8L No Start VIN: 1G2WP12K9Y
We are going to call this car fixed. On further investigation, we noticed that when the turn signals were used they were back feeding into the cluster. The guages & dash lights were going crazy. Found another post with identical problems & his fix was the mult... Trouble codes: U1000.
2002 Pontiac Grand Prix GT 3.8L ABS, Traction Control & ETS VIN: 1G2WP52K72
Turns out the C0156 code from the Pegisys Scantool was invalid. The Snap-On codes were the correct ones and a replacement of the wiring harness to the RF wheel speed sensor did the trick. Most of my replies recommended replacing either the harness or the whe...
2006 Pontiac G6 3.5L rotors VIN: 1G2ZG55846
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