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Professional Automotive Repair Technical Discussions for July 24, 2007 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 1986 Chevrolet Corvette 5.7L Poor Idle Quality, Surge, Stall idle hunts from roughly 250 up to 1200 solus says idle should be stable at 550 hot, cold as high as 1300 mass air has been replaced checked both relays mass air reading is 5 to 6 lbs per hr at hot idle ( i will refer to all as hot idle unless noted)injector ms... |
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| 1994 Chevrolet Camaro Z28 5.7L No Start VIN: 2G1FP22P8R problem is the injectors are not pulsing i have checked all grounds the wirng harness everthing ohmed good. replaced pcm with known good one and brand new distibutor. Still dont have any noid engine cranks fine but when hooked up to scan tool i have no rpm whe... |
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| 1994 Chevrolet S10 LS 4.3L #10 fuse VIN: 1GCDT19ZXR First of all I would like to thank everyone in advance for taking the time to read this post. I have this '94 S10 that is blowing fuse #10 ecm/ign fuse 10 amp. The best I can tell is the fuse is blowing while driving on the customer. From my diagram this circu... |
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| 1995 Chevrolet K2500 Cheyenne 6.5L Excessive Emissions, Misfire VIN: 1GTGK29F0S This truck starts fine no smoke but rev it up to 2000rpm it starts to missfire and black smoke code 19 or 18 will set eventually. under load or no load same problem. Engine runs better once ses light comes on. cam offset 0.08. Fuel psi is 4-6psi and will fill ... Trouble codes: 18 (cam sensor), 19 (crank sensor) |
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| 2000 Chevrolet Suburban 2500 LT 6.0L Rear differential VIN: 3GNGK26U9Y Every 50-75 miles when coasting to a stop light there will be a loud bang in the rear end when down shift occures. Everything in the drive line is tight and this only happens randomly - you cannot make it happen. I sent this to a transmission shop and he drove... |
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| 2000 Chevrolet Tracker 1.6L No Start VIN: 2C3GND3782 vehicle came in with a no start condition tested fuel pressure and is good 50 psi. has no injector pulse or spark. compression is at 130 on all cylinders. scan data shows no rpm when cranking. replaced cam and crank sensor with no change (also made sure that s... |
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| 2002 Chevrolet Tahoe LS 5.3L bcm VIN: 1GNEG13ZX2 Please bear with the long story, I want to make sure all the facts are out there. This 02 Tahoe will kill the battery after 3-4 days according to the customer. It initially came in and had a 221mA draw. It was brought back in the next day and for most of the d... |
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| 2002 Chevrolet Astro 4.3L No Start VIN: 1GNEG19X82 Hello this astro van came in the shop from a different shop they installed new fuel pump, new injectors, new fuel regulator new ECT sensor the van runs fine but has a problem when it is hot they drive the van for 1 or 2 hr and they stop for 5 minutes the van s... |
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| 2002 Chevrolet Astro LS 4.3L transfer case VIN: 1GNEL19X12 hello group, this awd astro came in with service awd light on and a code C0310(open on the encoder motor A or B circuit)did resistance test at motor connector it was open, tapped with hammer came into specs. replaced encoder motor, cleared history code and wen... |
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| 2003 Chevrolet Cavalier 2.2L Cuts out, Stall VIN: 1G1JC52F83 need help from gm guru: i have this 2.2 4 cyl cavalier if i 3/4 floor it in park or intermittently driving down the road i loose injector pulse. i checked and am not loosing the 12 volts to the injectors i am loosing the control side from the pcm. car will sta... |
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| 2004 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDT13S34 I have this trailblazer that came in with p1133 & p0172 codes in it, reflahsed computer per Bulletin #04-06-04-053. Noticed on road trip afterwards that O2 sensor acting erratic. Code p0133 came back. Put new front O2 sensor in it. O2 sensor works great now, b... Trouble codes: P1133, P0172 |
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| 1994 GMC Safari SLE 4.3L Starting VIN: 1GKDM19Z6R okay here goes- the problem is the car doesnt shut off. the problem is intermittent and when it happens, you can take the key right out of the van it still runs. the van does seem to be off otherwise, all the lights gauges ect are shut off the windows dont go ... |
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| 2001 Oldsmobile Intrigue GX 3.5L No Start VIN: 1G3WH52H61 June 12th car came in for a no-start. After all tests performed, found had 8 volts on serial data line. Replaced Pcm(Ac Delco reman)& car started(voltage on that circuit went to below .5 volts) Last night car towed in with same problem. Had 8 volts on serial d... Trouble codes: U1301 |
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| 1989 Pontiac Grand Am LE 2.3L ground strap VIN: 1G2NE54D5K I know this sounds strange, but I can't find the ground strap wire that goes from the engine to the body on this car. The factory service manual wire diagram has it hanging out in space and does not say where it is located. I went over, under and around this c... |
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| 1995 Pontiac Trans Sport 3.8L Hesitation, Surge, Cuts out, Stall VIN: 1G34G5778U so far p0101 came back as maf sensor low there is 5.54 reference volts to sensors ,starts fine but does studer then stall starts right back up, asking if anyone has had this on the 3.8 any help thanked ahead of time. Trouble codes: P0101, P0406 |
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| 1997 Pontiac Sunfire SE 2.2L brake master VIN: 1G2JB124XV Help. I am a AUDI specialist and seem to be getting confused diagnosing this simple car.. car came in with loss of brake fluid,I refilled the master,pumped the brakes (looking for a leak) and found nothing.I found the RF and LR have no pressure but the LF and ... |
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| 1998 Pontiac Grand Prix GT 3.8L abs module VIN: 1G2WP12K8W greetings to all,this pontiac has several abs codes,co896 device voltage range performance,co550 ecu malfunction,co450 steer assist control actuator circuit malfunction.the abs light is on as well asthe traction control light,customer says at times he does los... |
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| 1999 Pontiac Grand Am SE 3.4L passlock VIN: 1G2NE12E8X This vehicle will intermittently not start and security light comes on. The passlock cylinder has been replaced. DTC's B2960, B3133, and B3138 keep returning. Before I replace the BCM I would like a second opinion. Thanks guys, Lee |
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| 2002 Pontiac Grand Am SE1 2.2L No Start VIN: 1G2NF52F42 Come in crank no start, now has hard start cold. It started for us and drove it in. we scope tested the fuel pump (ok), scope test crank position sensor and the pattern was erratic but it would still start for us. Then in the process of checking it out it went... |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 1992 Cadillac Fleetwood 4.9L Excessive Emissions VIN: 1G6CB53B6N After checking all ground circuits and running new Oxygen sensor wire from sensor to PCM with no change, I replaced PCM.Vehicle now works the way it was designed.Thanks for the input to all that responded. |
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| 2003 Cadillac Escalade 6.0L bcm VIN: 3GYEK63N23 Thanks to all who replied. I did need TIS to program the BCM. There are different options of software you have to pick and choose from. My Tech 2 could not be used with the TIS on the SPS software because GM uses different drivers that my J2534 pass thru progr... |
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| 1975 Chevrolet C30 Cheyenne 7.4L pilot bearing Customers needed truck, so they went and found a used differential. Gave up looking for bearing due to time. I do thank everyone for their time and help. |
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| 1990 Chevrolet Lumina 3.1L No Start VIN: 2G1WL54TXL Yes the burden is fixed!!! Thanks to ken youmg, Dan [...] for mentioning the polarity of the crank sensor wiring. I notice that there had been previous repairs to the crank sensor... the customer had silicone all over the connector at t... |
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| 1997 Chevrolet C1500 Cheyenne 5.7L converter VIN: 1GCEC19R3V after hearing all af the problems with these tranny's and the mileage decided to do a complete reman.thanks to everyone who helped.i wish i had checked here before i installed a reman valve body. |
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| 2000 Chevrolet Astro 4.3L speedo odometer VIN: 1GCDM19W5Y THANKS TO EVERYONE WHO REPLIED. FUSE 19 (RADIO BATT) WAS BLOWN. IM NOT SURE HOW I MISSED IT WHEN I WAS CHECKING THE PLUG AT THE CLUSTER FOR VOLTAGES. WHAT I FOUND WAS IF THERE IS NO CLASS 2 DATA TO THE I/P THEN IT WILL DISPLAY BLANK. ALL DATAS WIRING DIAGR... |
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| 2000 Chevrolet K2500 7.4L Poor Fuel Economy, MIL Lamp on VIN: 1GCGK23JOY I think that lance from new york is right,I was talking to the guy and most of this stems back from a new fuel pump.The owner is going to drop the tank to see if there is anything wrong. Jon Trouble codes: P0175 (engine rich bank 2). |
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| 2002 Chevrolet Trailblazer LS 4.2L MIL Lamp on, LOW POWER MODE VIN: 1GNDT13S22 Thanks for all the help. David from Texas nailed it! From: David from Texas Date: Jul 10, 2007 10:01 AM Hey there John, I had the same problem not to long ago and it turned out to be a small leak in the air intake tube, the hose on the bottom wasn't on all ... Trouble codes: P1221 (tps performance/fuel pump circuit). |
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| 2003 Chevrolet Suburban 1500 LS 5.3L heated seats VIN: 3GNFK16ZO3 Sorry for the long response time, but vehicle is fixed. Thanks for all the helpful info. The problem was the drivers door module. Recheck all the wiring for shorting or grounding problems. Thanks to Wade in Colorado for the helpful tip on checking system. |
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| 1999 GMC Sierra 1500 SLT 5.3L electrical system VIN: 2GTEK19V9X Well I'd like to thank everyone for their help, sounds like a pretty common problem with the ignition switch on these trucks, amazingly enough we haven't had much trouble with them in our shop as of yet. I've not yet fixed the vehicle, the customer has driven... |
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| 1994 Oldsmobile 98 Regency 3.8L power windows, power seats, interior lighting, eng VIN: 1G3CX52L6R Thanks to all who took time to reply to my help request. Got many replies about ground buss connecter next to drivers seat sur enough it had gotten wet and infact was still wet inside the connector. Disassembled connecter wire wheeled metal slug to clean off ... |
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| 1999 Oldsmobile Intrigue GL 3.5L Cuts out, Stall VIN: 1G3WHS2H52 thanks to all who replied. I CHECKED ALL CONNECTIONS ALSO CHECKED WIRES AT FUSE BLOCK WAS OK I CHECKED AND REPAIRED WIRES AT SPLICE PACK AT ALDL CONNECTION WAS LOOSE BUT STILL DIDN'T SOLVE THE STALLING THEN REPLACED IGNITION SWITCH WHICH AS TO DATE HAS SOLVED ... |
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| 1986 Pontiac Fiero GT 2.8L compresor VIN: 1G2PG9793G thanks to Michael Quimsieh for wiring diagram. with it found splice that was burnt . repaired it and a/c works properly |
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| 1989 Pontiac Bonneville LE 3.8L Pressure VIN: 1G2HX54C5K Got a new compressor this morning, installed and charged A/C system to 2.4lbs, blowing cold, the reman compressors were Factory Air, installed with a Proliance new unit, blowing bergs. Cheers to all that replied! |
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| 2001 Pontiac Grand Prix SE 3.1L a/c system VIN: 1G2FC9345H Sorry about the long time for a reply, I have fixed this one. THe repair consited of another compressor from the yard the first one and original had the same problem exactally could not pull low or push high gauges stayed at static pres. the plug in the system... |
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