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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for November 24, 2004
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(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1997 Cadillac DeVille 4.6L MIL Lamp on, abs\ tcs light VIN: 1G6KD54Y2V
upon reinstallation of this engine the above mentioned codes arived for no aparent reason. please help. none of the systems affected by the codes seam to be failing. we are at a total loss. thanks in advance. russ Trouble codes: P0138, P0151, B1910, U1016, C1227, C1234
1988 Chevrolet Beretta GT 2.8L Stall VIN: 1G1LV11W1J
hello techys...this car has me baffled...i have replaced the control module and the 3 coils. thought i had the problem solved. the car ran 30-40 mins then just quit.. i let it cool down do about 146 degrees according to my scanner and it will start. this time ...
1993 Chevrolet S10 Blazer Tahoe 4.3L Poor Idle Quality, Cuts out, Misfire VIN: 1GNDT13W9P
Hey guys, This blazer is driving me up the wall! History goes like this: Came in running stinking rich. Found leaks in the CPI unit. Replaced nut kit and entire cpi unit w/rebulit from Linder tech. Car ran but still not very well. Found the dist. off 1 tooth,...
1994 Chevrolet S10 Blazer Tahoe 4.3L Poor Idle Quality, Stall VIN: 1GNDT13WXR
This Blazer has me and my colleagues baffled. Truck died while on the highway and was towed to the shop. Engine will start eventually but as soon as you give it gas, it dies right out. The truck barely idles and vacuum is only 3 inHg. Fuel pressure is within s...
1995 Chevrolet K2500 6.5L Clutch VIN: 1GCGK29F0S
Truck came in for intermittent hard shifter engagement sometimes had to shut truck off to engage,replace worn pivot ball and clutch fork (never greased)was great for a couple of weeks now it appears to be doing the same thing except when hot,Any one run into a...
1998 Chevrolet S10 LS 4.3L Excessive Emissions VIN: 1GCDT19X4W
hi gm tecs, have s10 not making it thru smog, no engine codes, all monitors run, o2 sensors appear to be functioning correctly, long trim trim on bank 2 is negative 13%, bank 1 is close to + or - 1, pulled upper plenium to verify no additional fuel from inject...
1999 Chevrolet Cavalier 2.2L Hesitation, Cuts out VIN: 1G1JC1245X
This vehicle came in with an intermittent runs rough and hard start, most after rain or car wash. Found code for MAP sensor circuit, checked wiring, replaced MAP sensor as could not find anything else. Came back, found a recall for high salt content area's, ge...
1990 GMC G2500 Vandura 5.0L No Start VIN: 2GTEG25H1L
help! customer came in with a no start. FUEL PUMP WAS NOT COMING ON. Power was applied to pump, and pump did not turn on. replaced fuel pump and sending unit. vehicle is still not starting. replaced relay, still not starting. applied 12v to test lead at relay...
2003 GMC Yukon SLE 5.3L On Star VIN: 1GKEK13Z43
Hi all, I road tested and confirmed this crackle noise is coming from the On-Star speaker. Has anyone had a similar problem? This is an anoyying noise the customer wants to get rid of. Thanks ahead of timre to those who reply.
1999 Oldsmobile Silhouette Premiere 3.4L tcs VIN: 1GHDX03E8X
Hi everyone, Looking for some help with a 1999 Oldmobile Silhouette. The TCS light in the dash will not turn on when the switch is depressed. The switch has been replaced with new and after further testing, the ABTCM module has been swapped with new. The lig...
1971 Pontiac Firebird 350CID L/F door
Customer came to me after having another bordy shop work on this one. They put on a new door latch, stryker, and both door hinges. This door is still hard to open. It seems like the door is sagging, however moving the stryker aroung makes it no better. By the ...
1989 Pontiac Bonneville SE 3.8L MIL Lamp on, code 41
looking for the GM tech bulletin #91618 I have an intermitten code 41 any help would be appreciated Thanks in advance Trouble codes: 41 (camshaft sensor)
1997 Pontiac Sunfire SE 2.2L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on
follow mitchel on demand 5 to the letter and all tests lead me to the computer, so i replaced it with a used one only to discover that i had not located the problem. Trouble codes: P0335, P00, 441 (crank sen cir)
1998 Pontiac Grand Prix SE 3.8L supercharger VIN: 1G2WP521WF
This car belpngs to my airplane mechanic, so I take good care of him! The supercharger belt jerks enough to cause the belt tensioner to jump, we removed the belt, all idler and tensioner pulleys seem ok,noise is gone with supercharger belt removed,(so it is n...
2000 Pontiac Grand Am SE 3.4L antitheft VIN: 1G2NF52E8Y
I took the time to check the archives but still wanted to post this one.Since day one this customer has had an int no start.It is a passlock problem for sure[10 min relearn gets it going every time].I just got this car in for the first time and having been the...

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick Century Custom 3.1L subframe/body VIN: 2G4W552J31
This vehicle has yet to return for further diagnosis. Replies to my help reqest suggest that the steering intermediate shaft might need lubrication, or that the lower control arm bushing steel sleeves, that are a press fit into the arm, might be loose. we now ...
1990 Cadillac Fleetwood 4.5L MIL Lamp on VIN: 1G6CB5339L
Thank all who replied, I havent yet heard back from this customer, however, what I found (or didnot find) was an answer to the question of the [...] wave coming from the ecm to the bcm, according to Alldata there should be 5v switching at ckt 526, anyhow... Trouble codes: F32 (BCM codeBCM-PCM data problem), E47 (PCM/ECM codeBCM-ECM data problem).
1997 Cadillac DeVille 4.6L Stall VIN: 1G6KD52Y8V
Crank sensors was the reply Iput in new sensors pulled the wire harness down and checked it all over loked fine The next day customer came in guess what same thing but after they ate at local pub Battery was dead so Ipulled batt pos cable for alt.and ECM loked... Trouble codes: P1599.
1991 Chevrolet Lumina Euro 3.1L Injector electrical circuit VIN: 2G1WN54TXM
This IATN Team is great! Thanks for everyone's feedback. The problem ended being a bad ignition module. Remember I had good spark, but no injector fire. The bad module would not send a rpm reference signal. My scan tool pointed this out when I cranked the engi...
1994 Chevrolet K2500 Cheyenne 5.7L 4th gear VIN: 1GCGK24K4R
Many thanks for all the thoughtful replies. Most replies hit it correctly in saying that it was a bad 'B' solenoid. My mistake was thinking that the solenoid was working, and it was,sort of. You have to pressure check it to see if it is leaking slightly, that ...
1994 Chevrolet Lumina Euro 3.1L blower motor VIN: 2G1WN14T8R
We replcaed the high and low blower relays plus the resistor and so far so good, thanks for all your help
1999 Chevrolet Cavalier 2.2L hard crank VIN: 3G1JC5246X
Thank you to everyone who replied, I have had trouble with chrysler ignition switches more than GM, but I had not checked it. So, with a channel of my Vantage on each of the two ignition output circuits there was no voltage lost across the switch. Then it was ...
1988 Oldsmobile Cutlass Ciera Brougham 3.8L Poor Idle Quality, Hesitation, Stall VIN: 2G3AM5133J
thanks to all that replied well i did injector balance test all check with in 1/2 pound each other decided to check spray pattern didn't look good all injectors spay a little streamy order injectors from linder 'injector guro' still same problem at request of ...
1998 Oldsmobile Aurora 4.0L No Start VIN: 1G3GR62C3W
The problem has to be a block/crankshaft mismatch. To prove the point, we borrowed a 97 Seville STS 4.6L NorthStar (which uses the same module part number)and parked it next to our Aurora. We than ran 4 jumper wires from the Caddy's two crank sensors to our si... Trouble codes: 1350 (Bypass line monitor), 1375 (No CKP sensor 1 or 2).
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