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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 29, 2005
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Open Help Requests for GM
Help Request Answers
1999 Buick Regal LS 3.8L abs VIN: 2G4WB52K7X
hello everyone. i have a 99 buick regal in the shop right now that is acting funny. it will intermittently(?) start or not start. when it does start the abs light and the trac light stay on and you cannot shift it out of park. got code p1602-loss communication...
1989 Cadillac DeVille 4.5L Instrument cluster, hvac control, VIN: 1G6CD515XK
This vehicle came in on a wrecker with a dead battery and #7 I/P fuse panel fuse blown, Dash lights inop as well as hvac, no alternator output. Replace I/P fuse #7 and charge battery. Vehicle runs for several minutes and blows fuse. I hooked up an amp meter to...
1993 Cadillac Eldorado Touring 4.6L Surge, MIL Lamp on VIN: 1G6EL1290P
This car starts to cut out under hard accel. at about 4500 rpm. it feels like a rpm limiter. I can not find any referance of this car actually haveing one. I told the customer that I wouldn't run this engine that hard with this many miles on it but he tells me... Trouble codes: 83 (crank sensor a/ b)
1992 Chevrolet C3500 Cheyenne 5.7L Force Motor VIN: 1GBJC34KXN
I have this stake bed from a trans shop that will set code 73 for force motor. I do not know why. All of the wires look good, the wires will hold amp if i power them up and put a light on the other end, I replaced the ECM, the trans shop put a new force motor ...
1993 Chevrolet C1500 Cheyenne 4.3L Misfire VIN: 1GCDC14Z0P
Hello gentlemen and Ladies of iATN. I've got a 4.3 T/B truck that seems to be kickin my butt. There is what seems to be a lean miss when the truck is hot and under load. I don't have a good ignition scope, or a gas analyzer to help me. Plugs and wires all look...
1994 Chevrolet Lumina APV 3.1L Cooling Systems VIN: 1GNDU06D8R
The customer complains that the engine runs fine in town, but when he takes it on the highway, it will overheat. This vehicle will run for almost 1/2 hour in the shop before the problem occurs. It will eventually overheat and pump out all of the anti-freeze. I...
1995 Chevrolet Corvette 5.7L Shifter interlock VIN: 1G1YY22P8S
Customer complaint: very hard to push shifter button down to get shifter to go into reverse or drive. We tested brake switch, ok. Power to solinoid, ok. Changes when brake pedal is depressed. We found the solenoid only comes with the shafter assembly, customer...
1995 Chevrolet Astro CL 4.3L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1GNDM19W7S
Help! I've been battling this one for a few days. It came in running excessively rich, i.e. black smoke from exhaust rough idle. Tested fuel pressure KOEO 62psi then it would drop to 0. Replaced the central fuel unit. Replaced the plugs, cap and rotor. Reteste...
1996 Chevrolet Beretta Z26 3.1L No Start VIN: 1G1LW15M4T
Vehicle towed in for no crank. Found a bad battery and wiring harness opened up with a wire that has been spliced. Found out it was a fusible link that the customer fried while hooking up the jumper cables backwards. I replaced the battery and the vehicle cran...
1997 Chevrolet Venture LS 3.4L Power Steering VIN: 1GNDX03E0V
Hi Group I have a Venture Van That has a steering noise and vibration at very low speed when turning the steering wheel . We Changed the steering rack and high pressure line 6 months ago . 2 weeks ago a noise and vibration started I can feel the pressure line ...
1997 Chevrolet Cavalier LS 2.4L Misfire VIN: 4G1JF32T5V
We have this 2.4 that runs fine up to 65mph then starts missing . ran car while hooked up to snap on solus. above 65 the o2s went lean acted like miss fire none showed up on scanner. turned on ac makes it act up worse. fuel psi and volumn fine at idle. Made su...
1998 Chevrolet Blazer 4.3L Blend Door VIN: 1GNDT13W4W
Car came in with heater/a/c oscillating between hot and cold. After moving the temp control a few times, it just went to full hot. Replaced the ECC control unit and still hot all the time. I don't do much GM work so I don't have the scanner to pull codes. Sea...
2000 Chevrolet Silverado 1500 5.3L MIL Lamp on VIN: 1GCEK19T2Y
vehicle came in for mil lamp on, history dtc p0446, evap system performance. followed dtc chart, fault not current. r.t.'d vehicle, fault not present. scan data with fuel cap off showed 1.41 volts, 4.85 in/Hg. scan data with psi sensor disconnected showed 0.02... Trouble codes: P0446
2000 Chevrolet Cavalier Z24 2.4L Poor Idle Quality, High Idle Speed VIN: 1G1JF12T1Y
This vehicle came in with a complaint of high idle speed approx 2 weeks ago. I noticed when starting the engine to drive the car in the bay that we had very slow cranking speed. Test showed an original battery on the way out. After replacing the battery all wa...
2002 Chevrolet Astro LS 4.3L Steering VIN: 1GNEL19X92
Experiencing a Vibration at Highway Speeds. Starts at 60 mph and continues up to 80 mph. Felt in the steering wheel as a Nibble. Felt in the Passenger Floorboard as a Driveline Vibration. Lessens when you back off the Throttle. Still present if slipped into n...
1998 Pontiac Firebird 3.8L Poor Idle Quality, hard start VIN: 2G2FS22KOW
Hi guys!Steve at Sparks again.This time I have a Firebird that has a hard start.Cranks about 6-10 times before starting.Once it starts it runs really ruff, you have to give a lot of gas for it to smooth out.When cranking we have spark and pulse to the injector...

Fixes & Summaries for GM
Fix/Summary Answers
1992 Cadillac Seville 4.9L Poor Idle Quality, Surge, Stall VIN: 1G6KS53B8N
ok well first of all I want to thank God for all the goodness he brings in all of us . thanks to all who responded with their ideas and their help . A lot of good advice from checking grounds to going back to basis.well it turn out to be yes thats right a defe... Trouble codes: 16 (system voltage hi/low), 52 (memory reset).
1991 Chevrolet K2500 Cheyenne 7.4L Int. crank, no start VIN: 1GBGK24N2M
Many many thanks to the three who took the time to try to offer up some help on this one. Nobody got it but then again, I didn't really expect a silver bullet on this type of help request but I was getting toward the end of MY rope and it always helps to have ...
1997 Chevrolet Monte Carlo LS 3.1L No Start VIN: 2G1WW12M8V
Thanks to all that replied. Sorry for the delay, as I waited for student input. Replaced fuel pump; problem corrected.
1999 Chevrolet C1500 Suburban 5.7L start and die VIN: 3GKEC16R5X
Got 3 good replies. One said transmitter items hanging from the keychain can sometimes make the vtd act up. That makes sense, but both keychains were clear of that. Another said the module was bad. It is under the dash, below the radio, but accessible laying o...
1999 Chevrolet Silverado 2500 5.3L 1-2 shift VIN: 1GCGK24U8Y
Sorry that I took so long to make a post on this vehicle.I do not have a good excuse;just simply forgot. First of all I found out that my scan tool was giving me problems, causing me not to retreive any datastream for transmission data and bi-directional contr...
2000 Chevrolet Blazer LS 4.3L interior lights VIN: 1GNCT18W2Y
hey guys found the light bulb under the hood was broken and the wires that hold the fillament was intermittantly hitting ground. aparently there is power all the time and the switch grounds the bulb. better chances of winning the lotto then getting this proble...
2000 Chevrolet S10 4.3L raer axel VIN: 1M8RKJE788
hi all, thanx for all the help. the customer liked the better acceleration with the better gear so we opted to install the little electronic box that alters the signal at the speed sensor. after installation we hooked up the scanner and drove it down the roa...
2001 Chevrolet Blazer LS 4.3L transmission/transfer case VIN: 1GNDT13W51
Thanks to all who replied for the vibration. We ended up doing a trans flush on Sat. and added trans fluid addtive.Truck drove nice and smooth on the test drive, customer picked up the car Sat. afternoon
2003 Chevrolet Express 3500 6.0L belt VIN: 1GBHG31U73
Thanks too all for the help and suggestions. The fix was compressor, drier and orifice tube. Suggestion of idle with ac on for 3to 4 hours seemed extreme but only took 45 min. for compressor to lock up. Checked as suggested for updated suction hose and compres...
2002 GMC Envoy SLE 4.2L rear washer pump VIN: 1GKDT13S12
well guys only got 2 replies on this so it must not be a common fault .After futher inspection we found it was the lgm liftgate module was the fault it was a class 2 bus line problem in the lgm.The tbm was not getting the info from liftgate module.There for wo...
1978 Pontiac Firebird Trans Am 6.6L engine VIN: 2W87Z8L130
I received varying degrees of information ranging from intelligent and helpful to not so helpful. (i.e. telling me all about small-block chevy 400 engines when the only 2 engines in the 1978 Trans Am were olds 403 and pontiac 400. ) Ultimately, I have determin...
1997 Pontiac Trans Sport 3.4L No Start VIN: 1GMDX03E3V
The suggestions we received suggested that we check the crank sensor and ignition module, and also anti-theft and alarms. We had previously checked all of these things. The AC Delco rep came out to help with a specialized computer, and we discovered that there...
1997 Pontiac Grand Prix GTP 3.8L Poor Idle Quality, MIL Lamp on, extreme high idle VIN: 1G2WP5219V
ok everybody. thanks for the help. after going in and re checking everything I started the dreaded re teardown. upon inspection of the throtle body passages I found a crack in the housing that was allowing air through. this in turn was burning out iac valves b... Trouble codes: P0507.
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