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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for June 25, 2007
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Open Help Requests for GM
Help Request Answers
1997 Buick Century Custom 3.1L MIL Lamp on VIN: 2G4WS52M5V
I have replaced EGR and cleaned intake.. after a few days car return with PO401A code.. or PO401b. there is not alot to this system but i am missing something.. I have ran a flow chart on this system and everything to the best of my knowledge is ok..but its ba... Trouble codes: P0401
1997 Buick Park Avenue 3.8L A/C Vents VIN: 1G4CW52KXV
Climate control system- not vacuum controled. The a/c vents have low/no flow, most goes to the defrost and when the mode is changed will send some to the floor but will not send it to the dash vents even in MID mode. Codes stored in memory U1016 & a history co...
2002 Buick Rendezvous CX 3.4L Safety VIN: 3GBDB03E2S
vehicle came in with complaint- all the lights in car flash,radio goes in and out and windows stutter as you roll them u and down and a/c does not work.spoke to customer as i had just looked at another aztec with same issue and customer declinedd chasing down ...
1978 Cadillac Fleetwood 7.0L fuel system VIN: 6B69T8Q229
Engine cranks but no start. Fuel pump does not work unless I jumper the fuel pump cavity{gray connector} in fuse box. All fuses are good. Also do not have power at the injectors with key on or cranking. When jumpering the pump connector, still no start. Of cou...
1960 Chevrolet impala 327CID reverse VIN: 01837J2591
are there any ways to step up servo pressure for reverse?
1985 Chevrolet S10 2.8L Stall VIN: 1GCCS14B6F
Truck came in for a new engine (Blown head gaskets, knocking in the bottom end) Over the last 3 years this pile has had repeated stalling problems on tip in accel, or at idle with the a/c on. Every time have been able to adjust carb to fix. It ran it's best ri...
1991 Chevrolet V3500 Silverado 6.2L engine VIN: 1GCHV33N3M
hi guys and girls.the 6.5 diesel i installed in my truck last month has developed a knock over the last week or so.its not there at idle and its heard mostly around 2000 to 2500 rpm area.oil pressure is at 30-35 psi and steady.i noticed the timing marks are no...
1992 Chevrolet C1500 Cheyenne 5.7L Mechanical VIN: 1DCGC148KD
I did a complete engine and transmission swap from the factory 5.7 tbi to a 2001 vortec engine transmission. I have upgraded the fuel pump and put all new plugs, and wires. also the pcm and wiring was still attached to the engine. Now I have adapted the electr...
1992 Chevrolet K2500 Cheyenne 5.7L Stall VIN: 2GCGK29K3N
Looking for some help. This truck will stall when a/c cycles from off to on. Acts like iac is sluugish, but i unplugged iac with truck running at 1000 rpms and truck still dies. Most often occurs after vehicle is warmed up and a/c blower is set on low setting ...
1997 Chevrolet C1500 Suburban LT 5.7L Front End VIN: 1GNEC16R7V
Hi Guys we have a 1997 Chevy Suburban that giving us fits. It makes a Clunk noise at a hard acceleration from a stop. When replaced the Front Coil springs, but still the noise remains. check all the motor mounts, tranny mounts, steering parts and suspension pa...
2000 Chevrolet Blazer LS 4.3L backfire VIN: 1GNDT13W3Y
greetings to all again, this one has a condition similar to the v-8's that will backfire from time to time and break off a starter. on the last visit she had blown the plenum apart. we replaced the crank sensor at that time (along with the plenum). this was 2...
2002 GMC Yukon XL 1500 SLE 5.3L Hard Start VIN: 1GKFK16Z32
Thanks in advance for any help. This truck came in originaly for check eng.light, found lean bank 1 & 2. oxy sensors & maf cheched out, no vac. leaks,fuel pressure Slightly low @ 45 psi. Fuel pump was running at 11.6 amp which we fugured too high. instaled new...
1996 Oldsmobile 88 Royale 3.8L fuel gauge VIN: 1G3HN52KXT
This is a good one for G.M techs.sorry its a long one. we had this car come in for a leak in the fuel tank area and thought we would change the send unit because the lines very rusty. After filling up car gauge would only read 1/4 tank and stick there. gauge ...
1994 Pontiac Firebird 5.7L No Start VIN: 2G2FU22P9R
Customer brought car in with complaint of int running rough , had start , no power or just cranks no start - he had it to dealer who replace pcm and injectors and then told him they dont know what to try next and sent him away 0 we replaced mass air flow senso... Trouble codes: 18 (injector circuit fault), 48 (mass aitr flow sensor)
2003 Pontiac Grand Am SE2 2.2L No Start VIN: 1G2NF52F83
Hi guys Have this very intermittent car .It sometimes will not start .When i got it once not to start one of the three voltages from the paslock sensor located on the key tumbler housing.Re learned the system and everything was great for more than a week .Now ... Trouble codes: U1040, U1088

Fixes & Summaries for GM
Fix/Summary Answers
1999 Buick Regal GS 3.8L abs module VIN: 2G4WF5211X
Luckily it stayed broke for a little while and the shifter shifted a little hard traced it all to the same fuse and the fuse only had 6 volts, traced it to ignition switch only had 6 volts too. Installed new ignition switch and now its fine. Thanks to all the ...
2007 Buick LaCrosse CXS 3.6L tpms sensor VIN: 1G2WC12V37
Thanks for all the replies A KTI TPMS Tool was used to reset the sensors and all is fine.
1998 Cadillac Catera 3.0L control system VIN: W06VR52R5W
I am now trying to locate a used control head for this vehicle. Two replies gave information on companies that rebuild GM electronic units such as dashes, however no one does these control heads. John from Ohio stated that there were issues with these control ...
2000 Cadillac Eldorado ESC 4.6L Compressor VIN: 1G6EL12Y5Y
This car is fixed. The car came to us with a new compressor, accumalator, and orifice tube installed at another shop. We had a code for a temp sensor in the line that runs across the firewall. The tip of that sensor was broken off. That should have raised ...
1977 Chevrolet Corvette 5.7L engine VIN: 1Z37X7S445
Thanks to everyone that replied, but we are still looking for the problem. Most of the ideas have already been done a couple were new and looked at with no avail. At this time we are still working on problem and hope to find solution, once again thanks to all ...
1996 Chevrolet K2500 Suburban LS 7.4L Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 3GNGK26J5T
First I want to thank everyone for their input on this problem. Michael you hit it right on the nose. The engine was replaced in this vehicle and who ever did the job put the wrong knock sensors in. The ones that were in it were for a 5.6L and ohm ed out at... Trouble codes: P0327, P0175, P0172.
2004 GMC W3500 Forward W3S042 4.8L Compressor VIN: J8DB4B1464
Hi All: The Customer has not returned as the insurance company has not authorized repairs. I thank all of you who replied. Concensis was that it had an orifice tube and that pressures couldn't be that high. I did further research and the "General" sent me a co...
1992 Pontiac Firebird 5.0L NO Start VIN: 1G2FS23EXN
Thanks to all that responded, particular Chris [...]. Ended up replacing the VATS module and vehicle fired up. I followed Chris's diagnostic plus the system check from alldata to determine problem. Also vehicle has an after market alarm system installed whic...
1998 Pontiac Grand Am SE 2.4L Poor Idle Quality, Misfire VIN: 1G2NE12T5W
we replaced the tower with a new one. if the customer comes back i'm gonna advise him to get a ac/delco tower. thanks for all your help,everyone. Trouble codes: P0300.
1996 Saturn SL1 1.9L Shifting VIN: 1G8ZH5289T
Thanks for the input everybody,the differance between MP6 and MP7 on the bellhousing made all the differance even the yard owner learned something new,he checked and found 7 MP7's and only one MP6 that was still in a totaled vehicle with only 35K on it and tha...
2004 Saturn Vue Red Line 2.2L No Start VIN: 5GZCZ23D34
after discussing options and expense with customer she decided to tow it to the dealer in beautiful Central valley as it is still under warranty. thanx to all that responded--I'll update the dealer remedy when she returns for maintenance--
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