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Prev Professional Automotive Repair Technical Discussions for March 22, 2006
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Open Help Requests for GM
Help Request Answers
1991 Buick Regal Custom 3.1L No Start VIN: 2G4WB54T5M
Customer conplained of hard starts, then no start. Have good spark, fuel is at 40 psi, great injector pulse, and compression. Were leaning towards a timing chain, any help appreciated. Thank Glenn
2001 Buick LeSabre Limited 3.8L class II dat VIN: 1G4HR54K61
This car has a very random problem that will occur every 4-8 weeks-the car will not start and/or will display "unknown driver" on the message center while driving.When we have checked it after it was towed-in every module in the car-pcm,bcm,ip,...etc would not...
2000 Cadillac Seville STS 4.6L Poor Idle Quality VIN: 1G6KY5497Y
Shows Po300 misfire on cylinders 1&4 on scantool, intermittent problem. Changed plugs and wires, no change. Coil packs seem to be OK. HELP!! Elden Trouble codes: P0300
1987 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1YY2180H
had both codes when it can in. cleared and put on shop maf sensor. drove 8-10 miles ok. on start up to pull in over night light poped on. only code 34 set. shut off to go get scanner hooked up code gone. seems to only come on on start up. still not there today... Trouble codes: 34 (maf low), 35 (maf high)
1991 Chevrolet K2500 Cheyenne 4.3L hvac module VIN: 2GCFK19Z8M
vehicle came in with complaint of battery going dead overnight, and hvac module staying powered up ater ignition shut off, some times would shut off and then power back up, so if we pull the hvac fuse it would shut off so we figured it had to be powering up th...
1993 Chevrolet S10 Blazer 4.3L No Start, Surge, Stall VIN: 1GHDT13W4P
this thing always has good fuel pressure even when it's actingup but it feels just like it doesn't it falls off under light load and surges badly. all the data egr map tps is good while it's acting up. the more you drive the worse it gets and the more sluggish...
1993 Chevrolet Astro CL 4.3L Poor Idle Quality, Surge VIN: 1GNDM19WXP
Hello guys, i have a 93 astro that came to the shop with a no start, found bad ignition module and replaced it. next i found it had excessive dumping of fuel, found it had a bad temp sensorand replaced it and the plugs,cleaned injectors. the van now runs fine ...
1993 Chevrolet Astro CL 4.3L Hesitation, Surge, Cuts out VIN: 1GNDM19W5P
runs great at idle and when not moving, when it reaches about half throtle the engine cuts out and surges,wont start at times until the fuel injectors are scrach tested.
1994 Chevrolet Corvette 5.7L Fuel lines VIN: 1G1YY22P4R
We have this 94 vette and the rear fuel lines from the tank to the filter are rusted and leaking. My question is has anyone replaced these lines before, any short cuts and any idea on how much time is involved in replacing the lines with oe replacement. Mitche...
1995 Chevrolet Blazer 4.3L engine VIN: 1GNDT13W1S
customer brought this vehicle into us to repair a problem they have had been living with for the past six months.vehicle starts fine cold and starts great actually 90% of the time except after the engine has been put under load-several kms. of uphill driving a...
1996 Chevrolet K1500 Cheyenne 5.7L no decell VIN: 2GCEK19R8T
This truck runs perfect and has no fuel mileage issues, but will not go into lean decell. There are no codes and the exhaust gas readings are very clean. If the battery is disconnected or PCM fuses removed for 30 seconds, it will go into lean decell for about ...
2000 Chevrolet Silverado 1500 4.3L No Start VIN: 1GCEC14W7Y
This vehicle initially came in with the classic gm truck no start condition. Upon locating an inop fuel pump we also noticed a sticky substance around the filler neck. It appears that this customer was the recipient of some vandalism. After removing the tank w...
2001 Chevrolet Blazer LS 4.3L MIL Lamp on VIN: 1GNDT13W11
This Blazer keeps coming back with a check eng. light on. It will come on about 7-10 days after being reset. The P0410, P0452 and P0453 keep coming back. The P0410 code set a freeze frame last time. Mileage since last failure:721, mileage since mil req:932, Co... Trouble codes: P0410 (Secondary Air Inj. Sys), P0452 (Fuel tank pressure sens. ckt low voltage), P0453 (Fuel tank pressure sens. ckt high voltage)
1997 GMC Jimmy SL 4.3L tcc slipage VIN: 1GKPT13W5V
ive ran several tests ,all pressures good ,we installed new engine about 2months ago ,customer says has had code 1860 for a long time ,i thought this would be an easy repair ,boy was i wrong ,i am wandering about grd wire bulletions for issue ,for ecm relocate...
2004 GMC Envoy XL SLT 4.2L pedal VIN: 1GKET16S54
Hello all, hoping to find some info on this Envoy we have. Owner claims the pedal goes to the floor when the vehicle is cold, usually after setting all night, or all day in parking lot. Only happens once, while pulling out of lot then has a good pedal. They ha...
1992 Oldsmobile Cutlass Supreme S 3.1L instrument panel VIN: 1G3WH54T2N
led display for fuel,speedo inop at times, seems like harness to unit might be at fought rapping on unit will reactive but shut key off and back on unit will not work only above mentioned items dont work, charge light,service engine light, seat belt ,oil light...
1993 Pontiac Trans Sport 3.8L MIL Lamp on, trans wont up shift VIN: IGMDUV6L2P
thanks to all in advance. This van came in with a complaint of no upshift after 2nd. On my first roadtest it did shift into third after a while and enough speed. I came back and scanned the computer looking for a trans code, but instead came up with a lot of c... Trouble codes: 25 (Manifold Air Temp to high), 65 (Cruise Control Servo Position Sernsor/67Fault cruise control switch/68 Cruise control command problem), 66 (A/C Pressure Sensor/Circuit Problem), 69 (High pressure switch circuit), 88 (PCM Reset), 99 (Power Management Problem)
2002 Pontiac Grand Am SE 3.4L 4 way switch & flasher VIN: 1G2NF52E12
The 4 way emergency light Switch, located in center dash keeps cycling the flash relay (internally in switch). While using turn signals left or right you hear the flasher click on each blink. (The flasher for turn signals and 4 way lights is located in the 4-w...

Fixes & Summaries for GM
Fix/Summary Answers
2004 Buick Rendezvous CX 3.4L speedometer going over 180 KPH and staying there VIN: 3G5DA03E54
I'm going to have to close this help request now. The majority of the respondeds suggested the instrument cluster as being the faulty part. Some even suggested this to be a common problem. Well my client is a used car dealer and they don't want to spend the mo...
1997 Chevrolet C1500 4.3L Mechanical VIN: 1GCEC14W6V
Well the truck runs great, the problem was with the rocker arm ball being turned upside down. You know you like the techs to have a little speed but when this happens you hate to climb all over them for doing some thing I did when I was starting also, Well wri...
1998 Chevrolet Metro LSi 1.3L No Start VIN: 2C1MR5224W
my brother marked the cam gear wrong & set timing belt to the i on gear it should have been set to the e runs good now
1999 Chevrolet Express 2500 5.0L MIL Lamp on VIN: 1GCFG25M5X
Thank you all for your quick response to my problem with code p1345. You all pointed to a problem with the distributor and were right on. My first problem was I was getting incomplete info on how to test for the problem. The test was to check to see if the rea... Trouble codes: P1345.
1999 Chevrolet Astro 4.3L No Start VIN: 1GNDM19W2X
Well got this one fixed. AC Delco help line was very helpful. I kept timing on number 1 TDC and pointing rotor to number 1. If you look at one of these distributors there is a very small 6 on the base of the distributor which should be lined up with the rotor ...
2000 Chevrolet S10 4.3L Poor Fuel Economy, MIL Lamp on VIN: 1GCDT19WXY
The majority of replies said to replace the MAF sensor. I couldnt get the customer to spring for a sensor unless I could prove it would fix it. He may go to a dealer and get a second opinion . The trans code never came back after the original time in. Thanks f... Trouble codes: P0101, P1870.
2003 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK23103
Again,thanks to all who replied. The techs at the dealer found bad injectors to be the cause and the glow plug circuit not complete (only 3 glow plugs were actually working). GM has extended the warranty on this truck to 200K. I don't know if its that way on a...
1995 Pontiac Bonneville SE 3.8L charging system VIN: 1G2HX52K2S
Hi, thanks to all who read and replied to my request for help. We were not able to fix this correctly and wired it up like an older model with a light. Some of the replies said to check grounds; main, ECM, and instrument panel. I checked all and all of the pow...
1998 Pontiac Sunfire GT 2.4L No Start, Hesitation, Stall VIN: 3G2JD12T3W
Well this one is fixed, after trying a known good cluster and do a relearn on theft system, the vehicle still would't run steady and a new code appeared PCM serial data no communication so we got a used ECM with plugins and did the relearn and it fired up and ... Trouble codes: P0335.
2001 Pontiac Aztek 3.4L No Start, Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: 3G7DA03E91
Thanks to Michael,Steve and Stephen seems that ignition switch is a problem area with GM. Finally got it to act up with tech 2 on vehicle,when I previously monitored the class 2 line all modules were always communicating, this time when monitored the class 2 c... Trouble codes: U1000 (ipc loss of communication), U1016 (refers to module not commuicating which is the pcm).
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