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Professional Automotive Repair Technical Discussions for June 17, 2010 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 1991 Buick Park Avenue 3.8L Excessive Emissions VIN: 1G4CU53L5M Ran about 6 pre-test on the machine and results all the same except NoX on first run which was 1800 PPM. Fixed small air leak and replaced ECT after test showed it was out of specs and NoX was reduced to 870 PPM. Also notice rust in coolant passage after ECT w... |
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| 1995 Buick Skylark Custom 3.1L drive belt VIN: 1G4NV55M9S Vehicle is back today for service and tech noticed belt is only on 1/2 of tensioner pulley and groove is worn into the back of the belt. We assumed we had an improper tensioner and obtained oe but the belt is still 1/2 off. We used a laser pulley aligner and c... |
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| 1964 Chevrolet Corvette 5.4L Rear Wheel Bearing VIN: 40867S1001 I know That you Vette guys will know this one. But I can not find the proper End play measuring and adjustment procedures. I know rear spindle and half shaft need to be removed. Also end play needs to be adjusted by shims. I would like any updated removal and ... |
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| 1986 Chevrolet Camaro Sport 2.8L Poor Idle Quality, Hesitation, Cuts out, Misfire VIN: 1G1FP871SG Thanks in advance for any help offered. Car came in running like craponly at idle. Found EGR valve stuck open, replaced and condition is still present. Spray entire intake with carb clean and found bank 1 leaking. Replace intake gaskets which someone else shor... |
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| 1988 Chevrolet C1500 Silverado 5.7L No Start VIN: 1GCDK14K8J Greetings, Dealing with a non-revenue "Christine". Engine has a intermitant poor performance feature, but fianlly has reached the no start condition. A check of the archives and with customer, shows everything suggestted there has been done. Has zero volts at ... |
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| 1994 Chevrolet Caprice Classic 5.7L speedo and odometer VIN: 1G1BL52P9R This is for all the gm tech's. I have an old police car our customer bought some time back with problems with the cluster. The cluster has a digital speedo,odometer and trip meter. The speedo and odometer goes blank. We had this cluster out for repair three ti... |
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| 2001 Chevrolet S10 4.3L Unknown VIN: 2GCCS19W82 This truck came in for a tune up. The customer complained of poor fuel economy. We did the above repairs and the engine runs and sounds great. The customer returned the truck complaining that the engine was missing. I went with him for a test drive. There was ... |
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| 2004 Chevrolet Tahoe LS 5.3L Radio VIN: 1GNEK13Z24 The customer complaint was sometimes the radio does not shut off when you have opened the door and are exiting the vehicle. Sometimes the radio has no sound , it lights up and all the cd and radio displays are on and seems to go thru the functions but has no s... |
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| 2000 GMC Savana 2500 5.0L no power VIN: 1GKGG25R5Y vehicle is more prone to problem when wet but not always. engine was a 350 but replaced with a 305. code po132b sets sometimes. when running good o2 readings look good,power not bad for a 305. was wondering if it is a computer problem have heard that the compu... |
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| 2001 GMC Sierra 2500 HD SLE 6.6L Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 1GTHK23101 Need help please!! I have a Duramax with a P0093 code. It has a performance box from edge. It has had this ongoing code for the last 3 years. I have installed a lift pump and new filters and now have a positive 9psi head pressure. The truck was good for about ... Trouble codes: P0093 |
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| 2003 GMC Yukon XL 2500 SLE 8.1L Air compressor VIN: 3GKGK26G62 I am trying to find locatiion of air ride compressor. All-data & Mitchell no help.Chevy & GMC dealer no help .Looked on frame behind both rear panels Etc. |
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| 2003 GMC Sierra 1500 SLT 5.3L 4wd VIN: 1GTEK19T33 ok been working on this truck for about a week service 4wd light is on and t-case will not shift while vehicle is running. will shift perfectly before the engine is started. have replaced encoder motor and TCCM reprogramed TCCM also have tested with a known go... |
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| 1998 Pontiac Bonneville SE 3.8L MIL Lamp on VIN: 1G2HX52K0W I have 4.87V at the signal line of the O2 sensor . Sensor replacement did not fix problem. I cut the wire at the computer coming from the O2 sensor , I found same voltage at both sides . Its strange that this voltage sometimes does not appear . , also the volt... Trouble codes: P0133 |
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| 2001 Pontiac Grand Am SE 2.4L Misfire VIN: 1G2NE52T51 This vehicle has a very intermittent misfire on #4 cylinder only. It has had new OE plugs,coil boots,ignition housing and metal cover.Swapped #1-4 coil to the other cylinders to test. Has had injector #4 replaced and this misfire comes back randomly. The code ... Trouble codes: P0304 |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 1990 Buick Skylark 2.5L No spark or injector pulse VIN: 1G4NV54U3L Well... Semi fixed. I now have spark and a signal from the crank sensor. After using a crow bar on the customer to pry this tidbit from the customer I have spark. I put an OEM crank sensor in and he toldme that he swapped proms from one ecm to the other,,, ... |
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| 1999 Buick Park Avenue Ultra 3.8L security light VIN: 1G4CU5219X First I would like to say thank you to everyone that replied to the request, Mathew helped put us on the right track. We thought it was the passkey III module because we could not get the auto learn to run at all. We watched the voltage as we turned the key an... |
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| 2005 Buick Rendezvous CX 3.4L No Start VIN: 1J4GW48S74 Well a lot of people have responded to this one. What I found was the fuel pump was bad. I believe when she was filling it and not running it it was doing something to the pump. Verified at gas station when problem occurs we get no fuel pressure. Comes back... |
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| 2005 Buick Allure CXS 3.6L P/S fitting VIN: 2G4WH567X5 Well I was a bit surprised by the lack of responses on this one. But anyways, I recieved the P/S pump fitting this morning finally, part #[...]. I cut the old nut off the line by gripping it with some vice grips and using a die grinder and a cutoff wheel ... |
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| 1993 Cadillac DeVille 4.9L Starting VIN: 1G6CD53B8P The starter was the problem.Although new only two days ago solonoid was bad.I took the ign. off of starter and checked for power.In start I had good power that went away when I released Ign key.So I jumped from batt.to solonoid, car started and did not stay en... |
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| 1994 Chevrolet Corvette 5.7L No Start VIN: 1G1YY32P6R WELL AFTER GOING BACK TO BASICS I RECHECKED MY INPUTS AND OUTPUTS I FOUND THE PIN FOR THE LOW RES SIGNAL BENT AT PCM I RECEIVED A LOT OF GOOD INFO.THANKS TO ALL WHO RESPONDED SO JUST GOES TO SHOW YOU NEVER FORGET THE BASICS THIS ONE IS OUT OF HERE. Trouble codes: 16 (No low ref signal). |
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| 1997 Chevrolet Astro LS 4.3L 3-2 ahift VIN: 1GNDM19W6V Well done everyone! The shift/timing solenoid was indeed at fault. I happened to have an identical vehicle come in for service, and figured I would compare my power and ground findings. The known good van showed exactly the same sequence of applying ground. I ... |
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| 2003 Chevrolet Silverado 1500 4.3L No Start VIN: 2GCEC19X83 I went ahead and removed the remote start and related wiring in the steering column.resoldered and heat shrinked everywhere they had cut into the original harness.performed relearn proceedue and truck started.have not heard back from customer so i assume all i... Trouble codes: P1631 (Vtd disable). |
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| 2006 Chevrolet Silverado 2500 HD LS 6.0L Unknown VIN: 1GCHK29U46 Thank you for all of the great input. By using your responses and showing them to the customer, they have decided to replace the transmission. It is nice to know there is this kind of back-up available using IATN. May God Bless each of you. |
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| 2007 Chevrolet Equinox LS 3.4L charging system VIN: 2CNDL13F87 Thanks to all that took time to reply. replaced alternator and it fixed problem. |
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| 2008 Chevrolet Express 2500 6.0L Surge VIN: 1GCGG29KX8 Well we are not sure if this is fixed. We found a shorted high mount brake lamp socket. Could never duplicate the complaint. I drove van for a week and no problem. I am returning today so you know it will act up tomorrow. Thanks for the replies. Trouble codes: P0573 (circuit 1 brake high), P0122 (p0222-), P0222 (p0223-), P0223. |
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| 1998 Pontiac Firebird Trans Am 5.7L headlights VIN: 2G2FV22G9W I have fixed the headlight problem with every ones help. The ground wire on the passenger side that goes grounds to the core support was bad. I still have a turn signal problem which I will probably re-post. Thanks to all that responded. |
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| 2005 Pontiac Grand Prix GT 3.8L cooling fans VIN: 2G2WS52214 found wires rubbed through from belt grounding pcm wires all the time. thanks for all your hep every one. |
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