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Professional Automotive Repair Technical Discussions for August 17, 2012 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 Poor Idle Quality, Surge, Cuts out, Stall VIN: 1G4CW53L3M Hi. This vehicle is becoming a pain. It surges and stalls in the shop and will stall after a quick accel and then let off the gas (Like you took off from a light too quickly) I've replaced the listed items. The fuel pressure and volume are within specs. There ... |
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| 1993 Buick Century Special 3.3L No Start VIN: 1G4AG55N7P This vehicle will not start no fuel. fuel pressure is at factory spec's 44.psi. I'm getting an injector pulse but it seems weak. If I pressurize the fuel system and unplug an injector and ground the ground side of the harness which fires the injectors and drai... |
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| 1970 Chevrolet Monte Carlo 5.7L rocker noise side to movement of rockers is the problem along with the tic the heads are stock the push rods stock the cam is mild the steel rockers are stock all parts new clueless any sugg greatly appreciated from those of u with more experience in this are...of course i... |
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| 2000 Chevrolet C3500 6.5L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: 1GBKC34F3Y hello fella's this one was kind of dumped in my lap,it is our own company rollback,a former tech of ours has replaced the pump twice and at each pump relacement he also replaced the module and resistor (which has already been relocated)and each time it would c... Trouble codes: P0251, P0215, P0219, P1216, P1218 |
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| 2004 Chevrolet Avalanche 1500 5.3L Parasitic drain on battery VIN: 3GNEC12T14 I have a strange one for all the Chevy gurus out there. This vehicle presented with parasitic drain that would drain the battery overnight. Have tested and replaced the battery, due to repeated deep cycles it would no longer hold a charge. Then found that the ... |
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| 2005 Chevrolet Tahoe LS 5.3L Misfire VIN: 1GNEC13Z25 Recuring misfire #3 condition. Replaced plugs and coils. Vehicle has been is several times for the same problem. Any suggesions? Thanks in advance. Trouble codes: P0303 (Misfire cylinder 3) |
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| 2008 Chevrolet Cobalt LS 2.2L Will no pass emissio VIN: 1G1AK58F78 Any one out there that can help a little will be highly appreciated. This car will not run the monitors. Customer has has the car since new. I have replaced both o2 sensors with no luck. I have done the drive cycle with no luck. I have driven the veh for 300 m... |
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| 2002 GMC Envoy XL SLT 4.2L oil pressure gauge VIN: 1GKES16S72 This gmc comes in with an intermittent low idle at times and the oil pressure drops low on the gauge. If we raise the idle the truck idles okay and does not feel like its going to stall. It would not do this until maybe a few hundred mile intervals. This occur... |
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| 2004 GMC Envoy SLE 4.2L Gauges VIN: 1GKDT13S24 This is my aunts vehicle and it has been acting up intermittently for a while now. The problem is the gauges quit working some times and the lights all come on when the gauges quit. I have looked around on the internet and have found many failed clusters in th... |
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| 2005 GMC Envoy XUV SLT 5.3L Misfire VIN: 1GKES12M75 Vehicle came in Mon. morning with engine tick, found collapsed lifter on #4.No Compression on #4. Replaced both new (lifters) on cylinder #4. Keep in mind it is a Displacement on demand(DOD) type system.#4 lifters are that type(DOD). We installed a new GM Oil ... Trouble codes: P0304 (Misfire 4) |
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| 2007 Hummer H2 6.0L p/s steering VIN: 5GRGN23U67 need help this one has gone thru 3 different shops to no answer. steering pump, gear box, all have been replaced . only one time has pump been from dealer. done flush. help help help. also new drive axles, upper and lower ball joints, new pitman arm. |
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| 2004 Pontiac Grand Prix GT1 3.8L No Start VIN: 2G2WP52294 Vehicle sometimes cranks but won't start or dies while driving. Found that there is no spark. Referred to ignition diag chart and 3x and 18x crank sensor pids show crank rpm but "CMP Sensor Signal Present" is "NO". Was referred to crank position sensor diagnos... |
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| 2005 Pontiac G6 GT 3.5L odometer/electric pedel hight adjuster VIN: 1G2ZH54885 good morning everyone hope your summers going well.so i have this 05 g6 we purchased at auction and recently sold.when we got it the drivers visor was missing and the wiring for the lamp was cut.this caused severe wire damage (read a whole lotta melted wiring ... |
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| 2008 Pontiac G6 GT 3.5L blower motor VIN: 1G2ZH57N58 morning i feel like a fool on this one. the blower motor is dead, but it looks like it's molded into the lower heater housing cover. the replacement (aftermarket) is a flange with 5 bolt holes. the dealer shows a motor and a retaining ring. do i have to cut t... |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 2005 Buick Terraza CXL 3.5L Lifters VIN: 5GADX33185 Due to time constraints, we wound up installing a used engine in this vehicle. I got a real good deal on the replacement engine, so rather than rack up a lot of labor time dissecting the original, we replaced it with this low-mileage one. When we slow down thi... |
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| 1959 Cadillac Series 60 Fleetwood 6.4L flexplate Many thanks to the 4 who answered, I am fitting the narrow plate with shims that I will make out of shim stock then send it all away for ballancing... God Bless you and yours Ernie |
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| 2007 Cadillac CTS 3.6L MIL Lamp on VIN: 1G6DP57797 FIRST THANKS EVERYBODY FOR ALL YOUR HELP, AND LIKE MOST SUGGESTED THE CHAINS WERE STRECHED AND A COMPLETE TIMING JOB RESOLVED THE PROBLEM. AS LONG AS YOU BUY THE SPECIAL TOOL FOR TIMING THIS ENGINE ITS A VERY STRAIGHT FORWARD REPAIR, THANKS AGAIN. Trouble codes: P0018 (Ckp- int cmp correlation b2), P0017 (Ckp-exh cmp correlation b1), P0008 (Engine position system performance b1). |
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| 1999 Chevrolet Silverado 1500 5.3L Misfire VIN: 2GCEK19T3X first of all thanks for everyones responses. . all very good info. i always lears a lot off of iatn. i was doing more research in the forum section of iatn and found a lot of stuff on crank angle relearns and misfires. so i decided to perfornm. a crank angle ... |
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| 2004 Chevrolet Trailblazer LS 4.2L Surge VIN: 1GNDS13S74 thank you for the help. it was a bad fuel pump. the first time i tested it, i got about 20 ounces in 30 seconds of fuel volume. i went back & tested pump again & it would put out about 8 ounces & then die. Trouble codes: P0420. |
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| 2006 Chevrolet Uplander LS 3.5L programing used pcm VIN: 1GNDU23L06 Well thanks to all that have replied.Customer doesn't want a rebuilt computer. Can't scan (should be able to scan it on the generic side) or pull a vin # out of 2 used computers. Programming a used computer I have always been able to read the VIN you change it... Trouble codes: P0335 (Crankshaft position sensor circuit). |
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| 2007 Chevrolet Equinox LS 3.4L po966 VIN: 2CNDL13F27 Well after testing, the Tcc checked ok. Ended up being a bad Tccm. Installed, relearned, & all is great! Thank you Matt & Justin for your help. Especially to Justin for getting us the needed diagrams needed to do the proper testing. |
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| 2007 Chevrolet Colorado LT 2.9L Poor Idle Quality, Cuts out, Stall, MIL Lamp on VIN: 1GCCS13927 Sorry for the delay the customer went on vacation and just got back. I removed the solonoid and found 1 screen broken the others plugged with crud. Replaced it and test drove yesterday for 30 min and all seemed ok so I am going to call it fixed. Trouble codes: P0014. |
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| 1993 GMC P3500 6.2L Turn Signal VIN: J8DC4B1K1P I apologize for not closing this request yet, other more pressing work has come in, so we havent' been able to spend too much more time on this one. An intermittent break in the wiring between the column and the flasher unit seems plausible. I will update this... |
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| 1999 GMC Safari SL 4.3L air flow VIN: 1GKDM19W9X Took apart the HVAC unit and found broken mode door. broken at hinge. |
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| 2003 GMC Sierra 1500 SLE 4.3L Poor Idle Quality, Hesitation, Cuts out, Misfire VIN: 1GTEC14X43 checked back pressure, replaced cats, ran good. thanks to all! cmp sensor took care of cmp code. still had cam retard of 13. did not set codes after several test drives. customer was satisfied and outof money. did not pursue cam retard issue. Trouble codes: P0101, P0102, P0174, P0341, P0756. |
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| 2000 Oldsmobile Intrigue GLS 3.5L Timing Chain VIN: 1G3WX52HXY Thank you for all the responses, we will use a bore score to check for marks on the pistons and recommend rebuilt heads with the chain job. Thanks again. |
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| 1998 Pontiac Grand Am SE 2.4L No Start, Hesitation VIN: 1G2NE52T6W I opted to go ahead and replace the instrument cluster. I have driven it numerous times without a problem. Codes did not return as well. John suggested installing a resistor in the pass key circuit. I have done that in the past and it worked. However, this veh... Trouble codes: P1629 (Theft deterent system crank signal malfunction), P1171 (Fuel system lean during acceleration), B1024 (Vehicle theft deterent fail enable due to bad R-code). |
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| 2005 Pontiac Sunfire 2.2L instrument cluster VIN: 3G2JB52F85 Thanks guys. Robert mentioned checking for AC ripple, so I did, but that was ok. The battery passed a load test, but was not great. Based on how "glitchy" this concern seemed, I decided to try a brand new battery before going with an ECM.I pulled the battery, ... |
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