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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for June 14, 2007
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1999 Cadillac DeVille 4.6L abs VIN: 1G6KD54Y4X
this caddy came in with a brake pulling problem.test drive revealed no brake pull but alignment was terrable,so we corrected alignment and car left,car returned next day with abs pump running at times and car slows down without touching brake pedal.has code u1...
1989 Chevrolet Camaro Iroc-Z 5.7L Poor Idle Quality, idle-hunting closed VIN: 1G1FP2186K
Hello fellow IATN members, thanks for taking time to read my story, hope you can help. I live in Houston, and Mac Haik chevy has been very helpful. Lee Loria the shop foreman, took a ride in my car with me and the scan tool (Monitor 4000 enhanced) hooked up. H...
1990 Chevrolet Lumina 2.5L Cuts out, Stall VIN: 2G1WL54R8L
Hello fellow techs, I have this 90 Lumina thats is starting to drive me crazy. I have had this car here for three days now with the customer compalining of a stalling problem. I have put over 50miles on this car and have not got it to stall out, after sitting ... Trouble codes: 44 (lean exhaust indicated.)
1994 Chevrolet Caprice Classic 5.7L Coolant resivoir VIN: 1G1BN52P0R
Good morning techs. I have a 94 Impala SS with oil in the coolant. Car was at a local dealer who cleaned the resivoir and told the customer he should not be driving it. They offerd no explanation or help. Now I have it. I have read about problems with the oil ...
1994 Chevrolet Corvette 5.7L front brakes VIN: 1G1YY22PXR
The car came in because of vacuum-leaking brake power booster (which could be heard inside the car). So, we replaced the power booster and worn front and rear brake pads. During the test drive, we noticed that the brake pedal is high and hard, and also front b...
1995 Chevrolet S10 2.2L blinkers VIN: IG4F8027HF
three days ago custy says ,went to use blinkers nothing so he replaced fuse of same size pop went from 15 amp 2 20 amp (on his on) and it poped so hes dropping it off tomorrow,any help in right dirrection thanked ahead of time.
1996 Chevrolet K2500 Suburban LS 7.4L Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 3GNGK26J5T
Hello and thank you up front. Have a 96 suburban K2500 with 7.4L code p0327 keeps comming back after few seconds. Performed diagnostics and it recommended KS (knock sensor) module. if code comes back replace VCM. we did so and code still comes back. Both knock... Trouble codes: P0327, P0175, P0172
1996 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNDT13W3T
Vehicle runs fine, no symptoms except that the MIL comes on with in one day of clearing the codes. I am leaning towards a fuel pressure problem, but would like a second opinion due to the expense of a regulator. Fuel pressure readings listed below in test sect... Trouble codes: P0300 (random cylinder misfire), P1133 (HO2S B1S1 insufficient switching), P0134 (low O2S activity B1S1), P0153 (O2 signal slow B1S1), P0171 (Fuel system too lean bank 1)
1996 Chevrolet C1500 Suburban 5.7L Poor Idle Quality, Stall VIN: 1GNFK16R3T
This 96 Suburban came in for a coolant leak and battery. I replaced the lower intake gaskets. The distributor cap hold down tabs cracked so I replaced the distributor. It came with a new cap and rotor. We used a NEW Dorman distributor. It has Delco double plat...
1998 Chevrolet Blazer 4.3L circuit 41 melted VIN: 1GNDT13W4W
I have traced the circuit (41) brown wire out of the IP fuse panel. It is melted at the panel and into the harness that runs behind the recess for the instrument cluster. Found the splice pack (SP200) on the passenger side floor area with 3 melted wires. Termi...
1999 Chevrolet K1500 Suburban 5.7L A/C Leak VIN: 3GNFK16R1X
Truck came in with no ac. I charged system and injected dye. I checked the most common spots to leak; high side port, schrader valves, cycle switch, compressor. did not find anything. removed glove box and blower to check evaporator. no leak. removed rear pane...
2004 Chevrolet Silverado 1500 4.8L No Start VIN: 1GCEC19V04
This vehicle has an intermitten no start. It will crank every time. However the fuel pump does not prime. The ignition coils and fuel injectors have power. There is no grounding from the PCM or ignition coil comand for spark. There are no codes. I have cleaned...
1987 GMC S15 Gypsy 2.8L not starting VIN: 1GTCT14RXH
Thanks in advance for the help, this truck will make you pull your hair out. This truck has been in and out of my shop so much but this time I need help. The owner had a friend take the 2.8 out and install a 3.1 in it out of a 95 camaro and the poor truck hasn...
1997 GMC K2500 Suburban SLE 7.4L dash VIN: 3GKGK26J2V
hello iatn members this 2500 has a little problem if you turn the head lights on the dash goes crazy every things pegs when you move the dimmer the dash reacts the gauges up and down likes the lights. we tryed the head light switch a dash it has a new alt,ing ...
1999 GMC C1500 Suburban 5.7L a/c VIN: 1GKF16R7XJ
I received this vehicle one day ago. Complaint: not cooling. I put the gauge on the vehicle the pressures were 150 hi and dipping toward 10 on the low. I replaced the receiver drier and orifice tube, and vaccuum the system down. The vehicle didn't hold the vac...
2002 GMC Sierra 2500 HD SL 6.6L No Start VIN: 1GTHK23142
engine lost power on e-way and quit shortly after. towed in scan and mechanical confirming no rail pressure. when using prime button no pressure can be built-up. leak out of rear intake to lower belhousing area. injector pump came apart internaly blowing out t... Trouble codes: P0087 (rail pressure low), P1093 (low system pressure)
2005 GMC Yukon Denali 6.0L ride control VIN: 1GKFF66U65
hi group. this suv came in for service ride control. found the code C0660 level control exhaust valve circuit. base on my otc scanner, it show the exhaust solenoid On all the time. and the compressor signal is off when the vehicle running. it look like the com...
2000 Pontiac Grand Prix SE 3.1L tachometer VIN: 1G2WJ52J2Y
the tach does not work thats the only problem. i get no voltage from pcm at the white wire.i do get an rpm on the scanner live data.i'm about to try crank sensors but i have no ides what one to change (there is 2) i also tried a used cluster and a pcm from ano...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick Park Avenue 3.8L No Start VIN: 1G4CW52L9R
We checked all power feeds and grounds again found no problem, ohm tested all solenoids and relays at pcm harness all good !4 reman ecm's . 1 e mail reply said he put 3 reman ecms and finaly went to the salvage yard for 1 and it worked.. I decided to...
1993 Cadillac Fleetwood 5.7L Pass key indentify VIN: 1G6DW5278P
Everyone is sending info on checking the tumbler, key chip, ect. but these have not been of any help. Near as we can tell the CCM (Central Control Module) is sending 5.29 volts down the signal wire to the key chip, this sets a short to voltage code (sets when ...
1989 Chevrolet R3500 Silverado 7.4L Poor Fuel Economy VIN: 1GCHR33NGK
Well I did have a few posts on the tank switching valve,I put a new one in it and have not seen it for week now. thanks for the help.
1995 Chevrolet Pickup C2500 7.4L Hesitation, Surge, Cuts out
ok this truck is fix. i replaced the whole distributor and runs great, i still don't know what is wrong with the old distributor because it was the first thing that i looked at, i replaced the main shaft,pick up coil and ign. module with no change i just can't...
2004 Chevrolet Silverado 1500 5.3L MIL Lamp on, NO ACELERATION VIN: 8ZCEK14T04
This problem doesn´t seem to be to easy to fix but after checking continuity on all the cables right from the throttle actuator to the TAC module to the pedal I decided to try with another Pedal sensor from another truck Following Jim [...] sugesting and ... Trouble codes: U, 0107 (Lost comunication w/throt actuator Ctrl Mod).
1997 GMC Savana 3500 5.7L Power steering VIN: 1GTHG35R8V
The problem with this van has been frustrating, even leading to the fleet abandoning the first shop who worked on it (of course, there was more, but it was the proverbial straw). The pressure to get it right has been high. Since the power steering pump had...
1996 Pontiac Grand Am SE 2.4L No Start, no spark VIN: 1G2NE12T9T
im closing this help request do to running out of time before it automaticlly closes ...i havent had much time to get this car back in but i think im going to try checking the timing next im getting spark now and fuel pressure crank and cam sensors are reading...
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