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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for November 8, 2005
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1988 Buick Century Limited 3.8L Excessive Emissions, Poor Idle Quality, Stall, Poor Fuel Economy VIN: 1G4AL5131J
Hi Gentlemen, Need some help on this one.Subject: 88 Buick Century 3.8L engine vin code #3, 80 k miles. Runs good until closed loop. Then loads up really bad and dies. Restarts but is flooding. Scan data: Integrator drops to 100, block learn falls to 113. Repl...
1992 Buick LeSabre Limited 3.8L abs & traction lights VIN: 1G4HR53L7N
originally had multiple inlet & outlet valve codes.replaced modulator assy w/ known good. came back with inlet & outlet valve codes. after testing, no problem found. replaced ebcm. car went to dealer, they replaced ebcm again,same problem. since, codes 61,46,4...
1997 Buick Park Avenue 3.8L No Start VIN: 1G4W52K0V4
Since then have substituted known good ign module, coils, cam, and crank sensor. Scoped cam, 3X and 18X crank signals.At times it sound as if the timing is off (backfiring in intake). Looking for any information known related to problems with the 3.8L . or ele... Trouble codes: P0300 (multiple missfires)
2001 Buick Park Avenue 3.8L Poor Fuel Economy VIN: 1G4CW54K71
We tuned this car up at about 60,000 miles and Motovacced it at the same time. The owner has been back twice now saying that they have lost 10-12 MPG since then. There are no codes in ANYTHING on the car. It runs like a watch and if you monitor it on the scann...
1982 Cadillac Seville 4.1L No Start, Stall VIN: 1G6AS6985C
The problem is intermitant but becoming more frequent, on occasion will start run a few seconds & die then starting again second time ok after long crank also 20 minutes after hot soak..will start after long crank & repeated cycling of ign key, also depressing...
1996 Cadillac DeVille 4.6L 2nd gear starts VIN: 1G6KD52Y9T
Vehicle came in with a dead input speed sensor and an intermittant range sensor code. Replaced speed sensor and range sensor along with necessary gaskets, filters etc. Now on initial take off it's in 2nd gear, but if you give it about 10% throttle it will down...
1997 Cadillac Catera 3.0L piston VIN: WO6VR52R5V
I have this cadillac with a broken #5 piston. It is under an extended warranty and they want to know why the piston busted. I have some ideas as to why but I feel they are looking to bail out and not cover this problem and they are wanting me to tell them what...
1989 Chevrolet Camaro Iroc-Z 5.0L No Start VIN: 1G1FP21F2K
this camaro came in on the hook as a no start. another guy in the shop looked at it and said that the fuel pump would not run and found the 20 amp fuel pump fuse blown. he put a fuse in and the car started and ran fine. next thing i know, i'm told to put a new...
1999 Chevrolet Blazer 4.3L MIL Lamp on, P0420 VIN: 1GNDT13W0X
This ought to be a "no brainer", but since I never saw any data from the oe cat, I'm not sure where to go from here. My customer told me the installer told her he didn't think it was the cat due to its' ( good ? ) condition, but he replaced it anyway with the ... Trouble codes: P0420 (Catalyst System Efficiency Below Threshold Bank 1)
2001 Chevrolet Silverado 1500 5.3L Surge, Misfire VIN: 2GCEK19T81
misfires between idle and 1600 rpm and is worse with load. all basic sensors check fine. also checked cam and crank sensor on scope look fine. Spark plug wires ohm fine. No sign of vacume leak. No codes set, Running out of ideas. If anyone has run into simmila...
2001 Chevrolet Malibu 3.1L ipc VIN: 1G1ND52J41
I can not make the temp gauge work for the engine. I looked at alldata schematic and coolant sensor/switch is the same. I replaced IPC with know good IPC no change.On scanner coolant temp is normal for for colant temp senor for computer but gauge in dash does ...
2002 Chevrolet Suburban 2500 LT 6.0L No Start, Stall, Misfire, MIL Lamp on VIN: 3GNGK26U62
upon initial inspection,found fuel pressure below specs @ 20psi.fuel gauge is reading 3/8 of a tank.when ignition is cycled there is batt voltage @ main fuel pump,pump runs,although there isnt enough pressure.droped main fuel tank,to visually check fuel level,... Trouble codes: P0300
2002 Chevrolet S10 2.2L Misfire VIN: 1GCCS14512
Helping a friend with his 2002 s-10. has an intermittent misfire on cyl #4 on accel or when I power brake it in the garage. It won't set a misfire code. There are no codes stored in pcm. I had a used coil sitting around so I changed it but it didn't help. Trie...
2002 Chevrolet Malibu LS 3.1L Misfire, MIL Lamp on VIN: 1G1NE52JX2
i hope this will be an obvious problem for the gm guys, i replaced the plugs and wires 5000 miles ago but the miss came back i seem to be getting plenty of spark (all coils seem ok) the injector all measure approximately 14.5 ohms the compression is aprox 150 ... Trouble codes: P0302
2002 Chevrolet Express 3500 6.5L No Start VIN: 1GBJG31F92
Truck will not start sometimes, cranks hard but will not start, this has happened 3 times in last week & when I get to truck on road it will start. it will not start after short drive about 4 or 5 miles. after it cool for a few hours it starts. scan for codes ...
2002 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC12492
Vehicle came in on hook. Cranks good but no start, not even a little, check for spark at all cylinders-ok, check compression-all 100-115psi good, check fuel pressure-53psi koec, check injector pulse with noid light-blinks during cranking, pull timing cover and...
2005 GMC Yukon SLE 5.3L engine VIN: 1GKEK13V85
Engine vibration after an accident.
1999 Oldsmobile Intrigue GL 3.8L suspension VIN: 1G3WS52K5X
There is a loud metalic creaking noise on right turn only. I have spent 2 days trying to figure this one out. Installed new RF hub/bearing & left axle--made no difference. The noise sounds like sheet metal creaking. It makes the noise on a slight turn (lane ch...
1993 Pontiac Bonneville SE 3.8L Cuts out, Stall VIN: 1G2HX53L7P
Hi Techs,I have a 93 Pont. Bonneville 3.8L that stalls intermittently when coming to a stop or when making a slow turn. Fuel pressure is good,EGR solenoids are turning off when I let up on the gas pedal,O2 is switching properly,cleaned throttle body and MAF se...
1999 Pontiac Grand Am GT 3.4L No Start VIN: 1G2NW12E2X
This is a last ditch effort. I listed this vehicle before, thought it was fixed but it is not. The car won't start. I have fuel pressure, spark, and no codes for ignition, only BCM code 1626. We have replaced PCM BCM and ignition switch. We have found that the... Trouble codes: 1626 (Theft deterrant)

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick LeSabre Custom 3.8L exhaust VIN: 1G4HP53L5P
joe, mike, and james hit it right on the head the trans modulator was leaking into the vacuum hose right in to the throttle body. the trans was three quarts low. thank you for the quick response.
1990 Chevrolet K1500 Cheyenne 5.7L Speedometer goes to zero VIN: 1JTNTR4KKL
Im going to assume the vehicle is fixed---I haven't heard otherwise. We cut and spliced some shady looking grounds at the intake manifold per one respondents thoughts. The looked corroded---we removed the bolts and shined them up also. We removed cluster again...
1993 Chevrolet K1500 Cheyenne 5.7L 2nd gear starts VIN: 1GCEK14K0P
This was one of those jobs that make you wonder why you are in this business. Checked ATSG data base first for matching symptoms. Nothing matches my symptoms, imagine that! OK, hook up the old mastertech, see if something on the electral side is amiss. Nope, e...
1994 Chevrolet Beretta 2.2L Cuts out VIN: 1G1LV1544R
we ran a new wire from ecm to crank sensor & customer was back in with no problems for 2 weeks thanks for the help Trouble codes: 19 (crnk sensor fault).
1997 Chevrolet Monte Carlo Z34 3.4L Cuts out, Misfire, VIN: 2G1WX12X1V
Bottom line, ignition module was the culprit. Thanks to Darren from Wisconsin who got me back on track to fix the problem. I was backwards in my thinking that the PCM was controlling the module when in fact, the module triggers the PCM. Once I recognized the r... Trouble codes: P0306 (Misfire 6).
1999 Chevrolet K1500 Suburban 5.7L unknown VIN: 3GNFK16R0X
Well all I finally got this thing fixed today after speaking with the customer i found the vehicle had some minor binding when turning as well, I spoke with a friend at a local Chevrolet dealer (thanks Brian) he said to try replacing the Power Steering Pressur...
2004 Chevrolet Silverado 1500 5.3L spedo VIN: 2GCEK19T04
Thanks to all who replied. Called customer to inform them of what needed to be done, they ok'ed it replaced cluster and customer is very happy. thanks again to all. IATN ROCKS
2003 GMC Sierra 2500 HD SLE 6.6L speedo VIN: 1GTHK23193
All this one took was a instrument cluster, didn't need to reprogram the BCM, apparently it only needs to be reprogramed if the instrument cluster is different than the one being replaced (as example steering wheel controls) or this is what I have been told, m...
1996 Pontiac Bonneville SE 3.8L Misfire, MIL Lamp on VIN: 1G2HX52K5T
Thanks all for your help. Rolando got it right on and Jerry and Jim aimed in the right direction. I ended up pulling the #5 injector off and replaced it with #1 injector. I could see a difference between the two and sure enough this miss followed the injector.... Trouble codes: P0300.
1997 Pontiac Trans Sport 3.4L Misfire VIN: 1GMDX03E5V
Another IATN Network Team Fix! Excellent job to all; Klay [...], and the Car Hospital. These gentlemen combined... Trouble codes: P0300.
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