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Prev Professional Automotive Repair Technical Discussions for September 16, 2010
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Open Help Requests for GM
Help Request Answers
1986 Buick LeSabre Limited 3.8L Poor Idle Quality, Surge, Poor Fuel Economy VIN: 1G4HR3737G
Looking for some help. This customer was referred to me to diagnose the rough idle and slight misfire around 45 mph. I checked everything with the labscope as you can see above. I had a problem with the aftermarket MAF reading 9 gps at 1000 rpm. Customer had a...
1992 Buick Roadmaster 5.7L Accessories VIN: 77NR454198
so i have a good one here i did a intake gasket the other day did job car starts and runs good went to put the heater on to see if i got all the air out of cooling sistem and car stared to stall out when on test drive to see what is going on and car acted like...
2002 Cadillac Escalade 6.0L gauges VIN: 1GYEK63N42
hi every one i have this 2002 cadillac excalade that the fuel gauge-shift indicator dont work also the batt light comes on and abs light and air bag lights come on i also cant comunicate with any of the modules or pcm with my modis but when i plug in a cheap h...
2004 Cadillac DeVille 4.6L driver seat VIN: 1G6KD54Y24
I need some guidance on this one. Driver heated and cooled seat inop. This seat uses a heat and cool motor under the seat and in the seat back.No body codes and seat is inop in both modes. When turning on the heat or cool mode the module under the seat clicks ...
1984 Chevrolet Corvette 5.7L Odometer VIN: 1G1AY0788E
Hi, this has been a very tough one for me, everything works on the cluster but the odometer. We have speedometer and getting signal from speedsensor. Installed different dash from place that repairs dash but no change what did i miss. Thanks john
1994 Chevrolet K1500 Suburban 5.7L low power under load VIN: 1GKFK16K0R
origional complaint was lack of power or bogging when HOT. Truck had been tuned at another shop prior to comming here. We found the fuel filter almost plugged (175,[...]) We changed filter, fuel pump and strainer. Truck came back 2 days later same problem. ... Trouble codes: 44 (lean)
1994 Chevrolet K2500 Silverado 6.5L Cruise Control VIN: 2GCFK29S5R
This cruise will always set, but will always stop working. Sometimes after 2 seconds, sometimes after a few minutes. I took my genyses scan tool with for a test drive and monitored the brake switch, cruise switch, and vehicle speed. I recorded my drive. When I...
1997 Chevrolet Blazer LS 4.3L No Start VIN: 1GNDT13WXV
Vehicle was sitting in garage and wouldnt crank over. towed in and have no power to anything except radio when you turn key on! light and all work so does blower. No Dash and no PCM comm. Help as Tech in looking for some Dynamite to blow it up! thanks Jimmy
1998 Chevrolet K1500 Silverado 5.0L Misfire VIN: 1GCEK14M7W
Hey guys I just have a few questions about this 1998 k1500 truck. It has the 5.0 in it. Im getting the code p0300 multi misfire. Hook scan tool up to it. At idle it misses on 7 allot once and awhile 1. When you bring the rmp up to 3500 7 and 1 will clear up an... Trouble codes: P0300
2001 Chevrolet Suburban 1500 LS 5.3L 1-2,3-4 shift hard VIN: 1GNFK16T01
Vehicle came in with hard 1-2 and 3-4 shift with a P0748 code stored for the Pressure control solenoid electrical. Replaced the PCS and problem still there. Original PCS ohmed out to 10 ohms and the spec is 3-7 ohms. Also, when monitoring data on the scan tool...
2004 Chevrolet Silverado 2500 6.0L transfer VIN: 1GCGK23U54
Truck came in for lights on selector switch changing to auto 4wd. The control module was replaced and programed but customer return with pretty much the same complaint. I found when cycling the ignition not all lights on selector switch would like as supposed ...
2006 Chevrolet Silverado 1500 LT 4.8L front diff VIN: 2GCEK19V66
Hey, I have a 06 Silverado with a manual transfercase (NVG 261) that goes into 4x4 on its own while driving down the road. The customer states that after pulling off the road and moving the shifter into 4x4 mode and back into 2x4 mode everythings fine. This is...
2008 Chevrolet Impala SS 5.3L Surge VIN: 2G1WD58C08
This vehicle is driven by a traveling salesman for long stretches of time (over the mountains each day)about 2 1/2 hours one way. The complaint is that when he is driving over Afton mountain (and we have dulicated this complaint once here in Richmond on an inc...
1993 Pontiac Firebird 3.4L Excessive Emissions VIN: 2G2FS22SXP
Need help on this one , This Firebird came in the shop for a Nox failure at 15 and 25 mph under load California emisions, specs call for 400 ppm at 15 and 25 mph, This vehicle is reading above 700. The customer came to the shop with a car that just got tuned u...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Cadillac DeVille 4.6L theft VIN: 1G6KD54Y9W
I got a few replies, but all said not aware of a way to disconnect anti-theft, not easily anyway. I noticed the trunk open light was on with the key on. The latch was all tore up, the automatic pulldown wasn't working, but the trunk was adjusted so it would cl...
1995 Chevrolet Camaro Z28 5.7L dome lights,chime, security light VIN: 2G1FP32P6T
Ended up taking to GM dealer and they installed a new BCM (like what we thought it was) works great now. thanks
2006 Chevrolet Malibu LT 3.5L Cooling Systems VIN: 2G1WT58K26
First of all thanks to all that replied.I tested the cap found that it was bad only held about 8psi.Also after talking with the customer again found that he was overfilling the overflow and with the bad cap causing the water to come out.Replaced the cap proper...
2008 Chevrolet Silverado 1500 LT 5.3L Transfer case VIN: 1GCEK19038
Sadly this problem has turned out to be so intermittent that I can't catch it acting up long enough to properly diagnose it. I strongly suspect that the position sensor in the shift motor assembly is at fault but don't have any data to back it up. Customer say...
1993 GMC K2500 Sierra 7.4L compressor VIN: 1GTGK29NXP
I told customer the best way to fix this is to replace condenser since he had this issue even before I worked on it. Since it's getting cooler he'll let me know when he wants to fix it. Until then I'll just have to wait and see. Thanks for all the inputs and I...
2001 Oldsmobile Alero GL 2.4L Stall VIN: 1G3NL52T31
problem was p0336 was stored , cleared code ,warmed up after hot would stall , would also start back up , code would return ,if you hold rpm up above 1200 rpm would stay running , after several tests per diag. charts, we replaced ckp sensor . tried to relearn ... Trouble codes: P0336 (Ckp sensor).
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