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Professional Automotive Repair Technical Discussions for June 28, 2007 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 1991 Cadillac DeVille 4.9L Excessive Emissions VIN: 1G6CN533XL hello, this thing failed smog for nox here are the readings, 15mph hc25, co0.01, nox725, co212.42, 023.12, at 25mph, hc 24, co0.00, nox924, co212.20, 023.37, egr is functioning properly, timing is at spec 10, o2 switches from 180 mv to 828 mv with a rise time ... |
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| 2000 Cadillac DeVille DHS 4.6L Unknown VIN: 1G6KE57Y4Y Vehicle blows warmer air from panel vents on LH side when AC is operating. Passenger side blows icey cold air (approx 48F w/ambient 86F) drivers side and rear center console is warmer (approx 61F). Scan tool showed a B0429 (Passenger side / rear air mix actuat... |
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| 1970 Chevrolet Corvette 5.7L Alarm Good morning, I am posting for a friend who is rebuilding a 1970 corvette, he is building a new wiring harness for the vehicle and needs a wiring diagram for the factory alarm. Currently he has 1 diagram but the information is confusing on the horn relay. Any ... |
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| 1989 Chevrolet Corvette 5.7L No Start VIN: 1G1YY3186K THIS CAR CAME IN WITH NO START. FOUND NO INJECTOR PULSE WITH NOID BUT DO HAVE DISTRIBUTOR REF @ ECM. CHECKED ALL FUSES AND GROUNDS, INJECTORS ARE POWERED UP AND HAVE FUEL PRESSURE. CHECKED PELLET AND IGN LOCK CYLENDER FOR BROKEN WIRES. CAR WILL CRANK WHICH IS ... |
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| 1992 Chevrolet Blazer Cheyenne 5.7L No Start, Poor Idle Quality, Misfire This is not the typical Thottle body system, this is a completly rebuilt block, new heads, edlebrock Sequential port fuel injection system. I did not do the install of the motor and all above mentioned parts. This vehicle came to us with a lack of power and mi... |
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| 1995 Chevrolet Caprice Classic 5.7L starter VIN: 1G1BL82P7S have replaced starter three times now for same sympton. starter use to only grind or disengage when hot, now at any time. have replaced ignition switch, starter enable relay, checked grounds and rerouted new wire to stater.still to no avail. to resolve problem... |
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| 1995 Chevrolet S10 2.2L No Start VIN: 1GCCS144X3 techs: This is a little off the normal problems. The truck had a 2.2 in it, now it has a LT-1/auto out of a 95 roadmaster , the problem is that when starting,you only get injecter pulse for about five seconds, then stops,but you still have fire from the coil a... |
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| 1996 Chevrolet Corsica 2.2L Stall VIN: 1G16D5542T Customer states this vehicle will stall at stop signs intermittantly. I've driven it a dozen times and it never stalls for me (surprise). On the first visit we discovered one fuel injector was different than the rest and that one cylinder was running rich. Tha... |
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| 1998 Chevrolet Blazer 4.3L 3-2 sol .valve ? VIN: 1GNDT13W5W Good morning all or is it?P0785 is my problem.The scanner pretty much only says,shift timing /solonoid.Alldata refers to this code as a problem with the 3-2 shift solonoid and or circuit.I've replaced this solonoid,the ignition switch,and ohm tested all the wi... |
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| 1999 Chevrolet Silverado 1500 5.7L abs VIN: 2GCEK19T0X Scratching my head on this one. Really could use some advice please. |
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| 2000 Chevrolet Tahoe 5.3L Poor Idle Quality, MIL Lamp on VIN: 1GNEC137XY hi gus we have this tahoe with p1221. customer complain is mil and reduced engine power on.cold engine vehicle has no power customer turned key off waited 2 minutes and restarted vehicle.it ran good again. Another technician pulled dtc but he did not get freez... Trouble codes: P1221 (tp sensor 1-2 correlation) |
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| 2001 Chevrolet Astro LS 4.3L transfer case VIN: 1GNEL19W21 I am hoping this van does not go bad on me but… About a month ago it came in with rear spider gears all chewed up. We found nothing abnormal so we put in new gears and replaced all the bearings and seals being that there was metal paste throughout the axle an... |
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| 2003 Chevrolet Trailblazer North Face 4.2L leak VIN: 1GNDT13S33 this truck came in for a quick check of fluid leak cleand and dye checked fluid coming out of transmission vent tube. fluid does not apear to be over full or burnt customer staes leaks more when out side temp is hot or when pulling a trailer we are not a trans... |
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| 1998 GMC Jimmy Envoy 4.3L instrament panel VIN: 1GKDT13W8W This Jimmy came in with intermediate hard start issue.Tested fuel pump first and found a problem and replaced pump.After pump replacement truck would start and die over and over again.Did passlock relearn and truck starts, but after a few seconds of running th... |
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| 1999 GMC Sierra 1500 SL 5.3L Transfer case VIN: 1GTEK19V9X Hi all, thanks in advance for any help I receive. I don't have any repair history on this vehicle since it was just purchased by a customer's 19 year old son. He brought it in saying he thought the transmission was going out because of a loud clunk he was hear... |
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| 1999 GMC Savana 3500 5.7L MIL Lamp on VIN: 1GDHG31RXX Good morning IATN this van came from a shop that replaced the tps per code only . code is po122 ( tps voltage low )My lab scope shows reference V @ 5 , koeo .69V ( tps signal out ) , with a perfect tps pattern . So far the " wiggle test " is o.k. , and curren... Trouble codes: P0122 |
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| 2001 GMC Sonoma SLS 4.3L ABS EBCM Circuit,Relay VIN: 1GTDT13W91 ABS light illuminates one a week just starting truck not moving and light stays on until it's shut off and may not turn light back on for a week. C0265,EBCM relay circuit is the code it sets and if shut off and restarted it is a history code,not current. I hav... |
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| 2003 GMC Yukon XL 1500 SLE 5.3L ebcm VIN: IGKEKI3Z03 customer returned with ABS Light on and code C0237 stored in memory. test drive and rear wheel speed sensor is functioning.inspected all wiring and related parts of the system and nothing obvious found. All brakes are at least 50% left and functioning properly... |
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| 2004 GMC Sierra 2500 HD SLE 8.1L Misfire, MIL Lamp on VIN: 1GTHK29GX4 THIS TRUCK HAS MIFIRES ON 2@7 moved 7 coil to8 still misfired on 7 tested coil with cop tester seems to not spark as much on 2@ 7 as the rest of the coils flash great again the miss did not follow the coil please help as i don't have much info on this system |
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| 1999 Oldsmobile Intrigue GL 3.5L Blows A/C fuse VIN: 1G3WX5248X This vehicle originally came in with a broken belt and a/c clutch siezed... Obviously, the compressor came apart throwing the belt... Also found blown a/c comp fuse... Replaced compressor and dryer and orifice tube... Charged the system, chnaged fuse and start... |
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| 1999 Oldsmobile Silhouette Premiere 3.4L MIL Lamp on, hard shifts VIN: 1GHDX03E0X Please help I have this van that is eating my lunch. It started with a P0336 code crank sensor. When this code set the tach stop working.Trans will shift hard or at times will slip when shifting. I ran the test for this code in alldata and there was no voltage... Trouble codes: P0336 |
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| 2002 Pontiac Grand Am SE 2.2L No Start VIN: 1G2NE52F32 intermitten no start. scanner reads cam & crank signals rpm signal present also shows fuel pump relay energised .no power to pump even with relay energised. vehicle has passkey=2 . security lihgt is not flashing as if system active . note symptom occured after... Trouble codes: U1000 |
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| 2000 Saturn SL1 1.9L Poor Idle Quality VIN: 1G8ZH5284Y symptoms are idle speed may hang high at 2000 rpms at times,yet turn vehicle off and re-start it then idles like it should. service codes that return pertain to low voltage fuel injector#1 and high voltage ignition control cylinders 1/2 and 2/3. very difficult... Trouble codes: P0261 (injector control circut low), P1351 (ignition control cyl 1/4), P1352 (ignition control cyl 2/3) |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 1992 Buick Park Avenue 3.8L no crank VIN: 1G4CW53LXN I am taking the advice of one of the replies to simply eleminate the theft system on this vehicle,This car is a high miler and not in very good condition.Customer does not want to spend any more on this car.I am running the yellow wire from the ignition switch... |
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| 2000 Buick Regal LS 3.8L No Start, Surge, Stall VIN: 2G4WB52K4Y thanks for the help fellow members,the problem was the ignition switch. the circuit that supplied power to the fuses for the pcm,bcm,instrument cluster,and a few others had only 5 to 6 volts and even less under a load. I repaced the switch and all the problems... |
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| 1992 Chevrolet S10 2.5L Stall, MIL Lamp on, Code 51 VIN: 1GCCS14A3N Thanks to everyone for replies. Special to Dan since is is very close to me. I ordered used PCM with PROM from Houston late yesterday afternoon. Thanks again Trouble codes: 51 (Prom Fail). |
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| 1994 Chevrolet S10 Blazer Tahoe 4.3L No Start, Ignition key stuck VIN: 1GNDT13W2R I disconnected the fuel line at the filter and checked my pressure and it was still 25 psi so I replaced the pump and sock. I replaced the ignition cylinder, the old one looked all twisted like someone had forced it with channel locks so that must have been w... |
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| 1998 Chevrolet Venture 3.4L Rear Brakes Parking Brake VIN: 1GNDX03E6W You guys are great. The fix is to adjust the park brake cable at the rear equalizer. That provides sufficient tension to move the spring out of harms way. Given the fleet of similar GM minivans vehicle out there and many with loose parking brakes, there ar... |
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| 1999 Chevrolet K2500 5.7L Poor Idle Quality, Hesitation VIN: 1GCGK24R4X |
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| 2002 Chevrolet Cavalier 2.2L Poor Idle Quality, Stall VIN: 3G1JC52472 Thanks for everyone's reply. We were able to fix this vehicle by using the help of two requests from all the techies out theres. First, we ordered a new a/c pressure switch and updated (longer) harness and plug to fix the torn one. Then we cleaned the IAC moto... |
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| 2004 Chevrolet Trailblazer LS 4.2L fluid level VIN: 1GNDT13594 ONE OF THE IDEAS FROM THE GROUP WAS THAT IT IS GOING INTO TRANS,BUT THAT LEVEL HAS REMAINED OK.THE OTHER WAS VACUUM SWITCH PULLING IT THROUGH ENGINE BUT IT USES A ELECTRIC SERVO TO LOCK FRONT AXLE AND 3RD RESONSE WAS LEFT GUESSING LIKE ME. WE ARE GOING TO ADD ... |
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| 2001 GMC Sonoma SL 4.3L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GTDT19W71 i finaly fixed this vehicle,by graphing tps and refrence power found out somewhere the 5 volt was shorting to ground.followed wireing from pcm and found short by rt motormount,harness was touching air injection tube,the only wire bare was the grey 5 volt lead... |
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| 2003 GMC Sierra 1500 Denali 6.0L MIL Lamp on VIN: 2GTFK69U13 FIRST OF ALL I WOULD LIKE THANK EVERYONE WHO TOOK THE TIME TO READ MY REQUEST AND RESPOND TO IT.TIME AND TIME AGAIN THIS REMINDS ME OF WHY I AM INVOLVED WITH IATN,BECAUSE WHEN YOU GIVE A LITTLE HELP YOU GET SOME BACK TOO. AFTER CHECKING MY MITCHELL ONDEMAND (W... Trouble codes: P0446. |
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| 1994 Pontiac Firebird 5.7L No Start VIN: 2G2FU22P9R WE TRACED OR SECURITY PROBLEM TO A CUT WIRE - REAPIRED AND WOULD CRANK NO START - FOUND GAS GAUGE WAS OFF AND WAS OUT OF FUEL - ADDED GAS AND DROVE GOOD - CUSTOMER HAS HAD FOR A FEW DAYS WITH NO PROBLEMS - THANKS TO ALL WHO REPLIED - WHAT A NIGHTMARE OF EVENTS... Trouble codes: 18 (injector circuit fault), 48 (mass aitr flow sensor). |
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