× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 25, 2005
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM
Help Request Answers
1993 Buick Skylark Custom 3.3L interior lights VIN: 1G4NVQ4N8P
vehicle came in for interior lights staying on, wont shut off and lights not going off w/ key on engine running. tested all switches and dimmer switch--all tested ok- replaced multifunction module w/ used one (discontinued part). lights go off after about 2 mi...
1999 Cadillac Eldorado ESC 4.6L heater control VIN: 1GGET1299X
hello, i have this 99 cadilac that intermittently has no radio, heater control. or power seat. sometimes everything works and other times 1 or more things not working. this problem started about a week ago. problem will occur with first start of the day. i hav...
1995 Chevrolet Blazer 4.3L ignition-dash VIN: 15DF5E6HKU
next time it died it shut off then dash gauges came back tried to restart crank but not fire at this time no service light try to restart it to check for spark and it started it never dies long enuff to find an answer any ideas
1998 Chevrolet Venture 3.4L MIL Lamp on VIN: 1GNDX06E1W
i have perforemed all test through alldata and it has all passed but iam still getting code p1665 i perform a evap vent soleniod test on scanner and it fails and puts a code po440 but i cant find any leaks i dont really want to throw parts at it so if anyone c... Trouble codes: P1665
1999 Chevrolet Silverado 1500 5.3L heeter core VIN: 2GCEK19T9X
Customer brought truck in with a noise coming from the dash with engine running. The higher the RPM the louder it gets. Whir/hum noise coming through the heeter core. If you pinch off heeter hose the noise stops. We flushed cooling system and heeter core seper...
1999 Chevrolet Malibu LS 3.1L Misfire VIN: 1G1NE52J7X
Car was sent to me after above codes were retrieved and parts were replaced. other tech said he tried coils and ign module with no change.he said the valve springs checked ok and compression was fine running and static. car still ran poorly when cold, and had ... Trouble codes: 102 (maf sensor low frequency), 304 (4 cylinder misfire), 341 (cmp sensor circuit), 410 (air pump system)
2002 Chevrolet Trailblazer LS 4.2L Stall VIN: 1GNDT13S52
Hello menbers, this one seems as though it should be simple but we are having a difficult time. First of all the customer came in with a complaint of the 4WD staying in 4LO. When we investigated, the system was oerating normally. The other complaint was that t... Trouble codes: U1000 (class 2 serial data problem), P1345
2006 Hummer H2 6.0L Sunroof VIN: 5GRGN22U66
Has anyone experienced a fluttering of the roof panel at high speeds. This vehicle has slight panel deflection of the roof while closed causing a "flutter" while driving. Dealer was no help, no posted concerns on GM site, roof has no center latch; uses guide r...
1996 Oldsmobile Achieva SL 3.1L engine VIN: 1G3NL52M5T
vehicle came in rough idle and throwing code 301 cyl #1 misfire checked coils, plugs, plug wires, injecters, injector pulse, compression is good across the board ignition control module is ok no matter what i do it has cyl #1 misfire
1996 Oldsmobile Cutlass Supreme 3.1L No Start VIN: 1G3WH52M8V
i need help i have a 96 Olds Cutlass Supreme 3.1L no start has fuel pressure and injector pulse has no spark the ignition module,crankshaft sensor,camsensor and all three coils still to no avail NO SPARK!!! wiring passes tests of having voltage and grounds whe...
1997 Oldsmobile 88 Royale 3.8L Misfire, MIL Lamp on VIN: 1G3HN52KXV
Yhis car has all of us baffled misfire counter for #6 cyl climbs high and does misfire. Have tried (yes I threw parts at it ecspecially after commons were out) spark plug, cable, 3x6 coil, reman fuel injector, used pcm. Engine misfires at idle and if throttle ... Trouble codes: P0300
1997 Pontiac Grand Am SE 2.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G2NES2TXV
Engine has dead miss constantly. Initially thought ignition, checked spark plugs, OK, gapped .060. I don't have special plug wires to test ignition secondary voltage, so I switched coils in cover, miss stays with #2. Installed new coil cover, switched spark pl... Trouble codes: P0141 (O2 Sensor Heater Circuit B1S2), P0302 (Cyl 2 Misfire Detected)
2000 Pontiac Grand Prix GT 3.8L TCS light on steady VIN: 1G2WP52KXY
Sets a U1304 immediatley after clearing- in the EBCM. The code says that the EBCM did not recieve data from the PCM on the UART data line. TCS off light is always on. Tech 2 can access data from PCM and EBCM antilock datalist. But when I select TCS data list I...
2001 Pontiac Grand Am SE 2.4L No Start VIN: 1G2NF52T61
Hello, this car has a very intermitant no start when cold only. If the car sits overnight it may not start in the morning, sometimes it will start after a few tries, or it may take up to 10 minutes. Once the the car was towed in, would not start (started up wh...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Cadillac DeVille 4.6L alternator VIN: 1G6KD52YXT
after two used instrument clusters I finally talked the customer into a rebuilt cluster and that fixed vehicle after theft programming
1989 Chevrolet Blazer Silverado 5.7L Poor Fuel Economy, KNOCKING VIN: 1GNEV18K8K
ign spark control was changed and tried, very lettele knock at this time
1994 Chevrolet Camaro Z28 5.7L No Start VIN: 2G1FP32P6R
Thanks to all who replied--Several of you had mentioned that even new delco distributors can be faulty. Also plugged exhaust is a common problem on these. Alas my brethren, the fault here was the ignition coil. Even though it was sparking 3/4 inch spark, appar...
1998 Chevrolet Blazer 4.3L srs VIN: 1GNDT13W1W
Hello All, Tech 2 does not have scan data for the discriminating sensors. I found a poor contact at the left sensor connector. I cleaned both connectors (right and left sides) and could not get trouble code to come back. Thanks to all who replied
1995 Geo Metro 1.0L Cuts out, MIL Lamp on VIN: 2C1MR2262S
Sorry it took so long to close...got too busy and spaced! Anyway the fix was to bypass a cruddy harness connector near distributor Trouble codes: 12 (all is well).
1997 GMC K1500 Sierra SL 4.3L Cuts out, Misfire, MIL Lamp on VIN: 1GTEK19W0V
Thanks for the helpful replies, I replaced the distributor and this one is fixed. Since cam retard was at -23 I decided to look into this further. The 4.3 liter is not adjustable like the 5.7 liter engine. I removed the distributor cap and found excessive play... Trouble codes: P0300 (Random cyl. misfire detected), P0151 (O2 signal low bank 2 sensor 1), P0137 (O2 signal low bank1 sensor 2), P0131 (O2 signal low bank 1 sensor 1).
1995 Oldsmobile Achieva S 2.3L Poor Idle Quality, Hesitation, Stall VIN: 1G3NL55D1S
Thanks for the replies but we have not had the vehicle back in the shop to continue testing. Will update with new post if anything changes. Special thanks to Allen for double checking the prom. Trey
1999 Oldsmobile 88 Royale 3.8L Misfire VIN: 1G3HN52K8X
Thanks for all the replies,most were about compression low on that cylinder.We talked to the machine shop that did the heads and told them our problem.They suggested shimming the rockers to see if that would let a valve seal but no luck.Finally ended up removi... Trouble codes: 300 (cylinder 3 misfire).
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next