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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 3, 2007
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Open Help Requests for GM
Help Request Answers
1984 Cadillac Fleetwood Brougham 4.1L No Start, VAPOR LOCK VIN: 1G6AW6988E
Hi techs. This clean well maintained car leaves a bad taste in my mouth. After 30 minutes hot soak (in the sun) we have a crank & no start. Checking at the fuel pressure service port, pressing the schrader valve, I get PSSST...Air. Then fuel. WTF? I have never...
1998 Cadillac DeVille d'Elegance 4.6L ebtcm VIN: 1G6KE54Y6W
vehicle came in with code C1277 for loss of reqested torque signal. following trouble code chart in Mitchell 1 and information tip in Napa Fix came to the conclusion to replace EBTCM. intermittently codes for open or short in wheel speed sensors also come up. ...
1996 Chevrolet Lumina LS 3.1L shift quality VIN: 2G1WN52M8T
This car will shift make erratic shifts from 3rd to over drive at speeds of 55-60 MPH. The converter also will make erratic lock/unlock shifts. My Gynesis system shows that this is being commanded from the PCM. The engine seems to be running fine for the most ...
1996 Chevrolet Blazer 4.3L air bag VIN: 1GNDT13WXT
This blazer came in with an air bag on. The only code that was in it was a #83 with a description of, Driver reserve diode fault. I have cleared the codes and now the light is on but there's no codes. I really need some help here.Thanks
1998 Chevrolet K1500 Suburban 5.7L No blower operation VIN: 1GNFK16ROW
Hi GM Tecs, this Suburban's AC compressor functions well, accumulator ice cold, problem is blower doesn't get power from resistor nor does resistor get power from the ac control module. This module was replaced 3 months ago. Truck returned and pulled module an...
1999 Chevrolet Blazer 4.3L air temp./blend door VIN: 1GNDT13W9X
this customer's blazer is blowing hot all the time. he complained of no ac and blowing hot all the time. the compressors was not engaging and system was low on refrigerant. Evacuated and recharged system with dye to check for leak. AC now functioning properly ...
1999 Chevrolet Malibu 2.4L noise VIN: 1G1ND52TOX
engine has noise at 3500 rpm in park or neutral...engine is not knocking,drive belt disconnected. sounds like a resonation or howl..water pump was replaced due to seapage at weap hole...converter was good no noise emitting from exhaust...checked all brackets f...
2000 Chevrolet C3500 7.4L lifters VIN: 1GDKC34JXY
we did a inhouse rebuild used same lifters and camshaft after the lifters pump all the way up we get no compression .we tried [...] under size push rods but still the same thing. never had this happen before any ideas anyone.
2001 Chevrolet Impala LS 3.8L compressor VIN: 2G1WH55K91
This car has a knocking compressor, not real loud but definately making a noise. My question is can it be the charge not perfect or is the compressor on its way out.
2001 Chevrolet Silverado 2500 6.0L shift problem VIN: 1GCHC23U01
hi guys . this 2001 chevy 2500 hd seems to shift fine in town till you need to pass someone. then the transmission feels to slip.engine revs high. replaced transmission/computer/tps sensor. the local trans shop says may have a wiring problem. i just need a pla...
2001 Chevrolet Cavalier 2.2L theft system VIN: 1G1JC12491
hi every one need help on this one the car starts and dies theft light dose blink or stays on. checked codes had b2947 b2958 p1632. seems to have theft problems checked voltage at passlock sensor has 12 volts and has ground it also reads 5.0 volts in scan tool...
2001 Chevrolet Impala 3.4L No Start VIN: 2GIWF52E11
Customer complained of a no crank. I checked codes and got all the codes listed. Customer stated that when it would not crank the radio did not work either. I could not duplicate the problem so I performed the tsb for tightening bcm terminals and cleaned the g... Trouble codes: U1255 (Class 2 communication), U1301 (Class2 short to battery), B2960 (Theft system), U1064 (Loss of communication), P1626 (Theft system)
2003 Chevrolet Express 3500 6.0L Electronic VIN: 1GBHG31U63
This Chevy will not ground the A/C clutch relay. I am able to go through and ground the relay (thus making the compressor turn on)via my aftermarket Snap On scanner. While looking through the data I noticed that there was "no" A/C request. The request comes fr...
2004 Chevrolet Suburban 2500 LS 6.0L Encoder Motor VIN: 1GNGK26U24
Vehicle came in with service 4 wheel drive in the instrument cluster. Retrieved code C0327 - Encoder motor circuit malfunction. 4 wheel drive buttons light up on bulb check but have no lights when truck is running, and buttons don't seem to do anything, but on...
2003 GMC Sierra 1500 5.3L instrument cluster VIN: 1GTEK14T22
Hi: Instrument cluster has been replaced 3 times for various inop concerns. Last two clusters have had the trip odometer reseting to 0 when the truck is turned off. It does not have steering wheel controls. Everything else works fine. What are we missing? I k...
1999 Oldsmobile Cutlass GL 3.1L Stall, MIL Lamp on, INOP TACH VIN: 1G3NB52M6X
have replaced 24x sensor. inspected wiring harness from computer to sensor. found no problems. tach reads zero at all times. tech 2 readings at 24x sticks at 9108 or 108. sets the code immediately when the ignition is turned on. customer complained that the ta... Trouble codes: P0336
1989 Pontiac Grand Prix 3.1L Hesitation, Cuts out, Stall VIN: 1G2WJ14TXK
The car came in as a no start 2weeks ago.Installed Crank sensor and ran good.Now car comes back with no codes as soon as you give it any gas dies out.I checked fuel pressure and was good.I disconnected the exhuast with no change.I ran a scope pattern on the in...

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Roadmaster 5.7L Unknown VIN: 1G4BN5374N
1989 Cadillac DeVille 4.5L Fuel data display VIN: 1GCD5155K4
Thanks to Robert[IN],Michael[NY],Ed{NJ},George[RI].Robert suggested a bad CCM but this car does not have one. Michael thought there could be a failure on the clock or data circuits from a bad BCM. Ed suggested another capacitor. I failed to mention that I had ...
1974 Chevrolet Corvette 7.4L Start up and shut down
Thank You all for the info and wiring diagrams.The fix was the cooling fan wiring . The person who wired the fan used the grab and run method of wiring.He caused both of the problems by grabbing the wire that ran to the distributor ,from the starter R terminal...
1997 Chevrolet malibu 3.1L fuel guage
will use this info when vehicle comes back in again thanks for the outstanding response did not know this was such a common problem thanks guys and iatn u are great
1999 Chevrolet Cavalier 2.4L clutch petal VIN: 1G1JF12TOX
thank you all for your replies . we just kept bleeding the system & it finaly worked . the next time i will try the reverse bleeding first & hopfuly save some time .
2000 Chevrolet Blazer LS 4.3L trasfer case VIN: 1GNDT13W9Y
thanks to every one the problem was the module in the right side kick panel had no clue without iatn help i had no codes at all and was an intermintant problem
2000 GMC Jimmy SLE 4.3L brake lights VIN: 1GKCS13W2Y
thanks to everybody who replied, replaced the multifunction switch and everything works fine.just wondering why a $30 to $40 switch cost over $200. jay
2001 Pontiac Bonneville SE 3.8L rear air ride VIN: 1G2HX54K61
Since this post the car has not returned for further diagnosis. Thanks to all who sent responses.
2001 Pontiac Sunfire GT 2.4L Poor Idle Quality VIN: 3G2JD12T31
Iac count at an idle is 105 cnts. Even on start up engine idles higher than 1500 rpm. Used iac tool Iac appears to move in and out ok. If i disconnect the battery for an hour or two It will idle ok for about an hour on my way home. I also make a mistake the pr... Trouble codes: P0122.
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