GM Automotive Technicians Technical Discussion and Fixes for Jan 30, 2007

Join Now

Prev	Professional Automotive Repair Technical Discussions for January 30, 2007 International Automotive Technicians' Network (iATN) - Members Only	Next
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM

	Help Request	Answers
	1992 Buick Regal Custom 3.1L No Start VIN: 2G4WB54T3N Car came in on hook,owner had a receipt for another shop said they replaced module & coils also did tune up. He said sometimes won't start even after said work was done. I checked for spark & Inj pulse no on both. Plugged the scanner checked for codes no codes...	View
	1998 Buick Regal LS 3.8L battery VIN: 2G4WB52K2W Hi, Have this buick that we have been chasing a parasitic draw for a couple of weeks. When the draw appears it is a 12v draw. Pulling the bat1 fuse takes it away or pulling the 15amp fuse in the interior fuse panel that is labeled radio rfa cluster hvac takes ...	View
	2002 Buick Regal LS 3.8L steering,suspension and BANK ACCOUNT VIN: 2G4WB55K52 hello all! this buick is becoming a real headache.when backing up,like out of a parking spot,to the left or right i get a popping sound.when backing up to the left the noise is on the right side.when backing up to the right the noise is on left side.if i put m...	View
	2003 Cadillac CTS 3.2L No Start VIN: 1G6DM57N83 Vehicle was towed in with no start with a no spark condition. After running through the various tests, backprobed cam and crank sensors at the ECM. While backprobing, relays started clicking and car started. We pulled connector, tightened the connectors and ca...	View
	1991 Chevrolet S10 4.3L clutch VIN: 1GCCS14Z9M Thank you in advance. This truck came in with a hard shifting problem. The clutch pedal felt firm but it was difficult to change gears and it grinds badly, especially reverse. If you put it in gear then start the engine, it would want to creep and the clutch w...	View
	1995 Chevrolet Caprice Classic 5.7L ABS sensor Hi everyone, I have a used rear axle I used in my 90 9c1 caprice. It is being swopted to my other car. I've been looking for the output of the ABS sensor. Know one can tell me. It's not in my books at work and no help from All Dada or Mitchel. Can any one tel...	View
	1996 Chevrolet C2500 Cheyenne 5.7L MIL Lamp on VIN: 2GCFC29MST got this truck after someone else installed engine was not running replace dist cap and is running. setting p0340 cmp curcuit and p0102 maf sensor. cam retard reads -45 all the time even when i raise idle above 1000 rpm while moving dist and mass air shows 8-1... Trouble codes: P0102 (mass air low frenency), P0340 (cmp curcuit)	View
	1998 Chevrolet K1500 Cheyenne 5.7L airbag VIN: 1GCEK19R1W Greetings all techies, hope you can help with this one. Installed new signal switch last week (old one physically broken) and airbag lite on ever since. Checked all wires thru column and nothing open, pinched or broken. Code B1022 in system (Drivers deployment...	View
	2000 Chevrolet Venture 3.4L Oil consumption VIN: 1GNDX03E7Y Hi everyone and thank you all for taking time to help. We have this 2000 Venture that just started to burn a lot of oil as in at least a quart every 1000 miles were as before it was not burning any. The oil has been changed regularly and there are no major ext...	View
	2001 Chevrolet Malibu LS 3.1L Radiator Fans VIN: 1G1NE52J01 Hi all, This car has both of the radiator cooling fans running all the time when the engine is running. With the key on and engine off they do not run. There are no trouble codes in the PCM or BCM. In the summer this may be ok, but in the winter the heater is...	View
	2001 Chevrolet Impala 3.8L MIL Lamp on VIN: 1G1W567KE1 This car will run the cooling fans after you turn the key off for approx 1 min. It happens evey time. Even when you start in the morning with IAT at 23*F(it is 15 degrees F here now) I have pulled #1 relay and found the PCM to be grounding the turn on wire at ... Trouble codes: P0128	View
	2002 Chevrolet Silverado 1500 5.3L Axle binding VIN: 2GCEDK19T0 Here is the issue, the vehicle binds and hops when in auto 4x4 on dry pavement when turning. Does not do this in 2wd. Check for DTCs and there are none present, no history codes. Can watch the the truck put itself into 4wd high with no slips recorded. The only...	View
	2002 Chevrolet Express 2500 LS 5.7L abs module, ebcm VIN: 1GAGG29R12 van has 6 different codes w/genysis scanner, 3 codes only w/ modis, 1 code only w/ solus. all codes relate to ebcm failure. has good power going in, all fuses good, all grounds tested ok even added extra ground to ebcm. you can clear codes but will come back w...	View
	2003 Chevrolet Silverado 1500 HD LS 6.0L rear rack VIN: 1GCGK13U63 I have a 2003 Chev Silverado with this quadra steering I think they call it. Never seen or worked on this system before. Friends brothers truck. I scanned it for any codes found none in engine or transmission. The only fuuny thing is that his speedo stop worki...	View
	2003 Chevrolet Impala LS 3.8L abs tcs VIN: 2G1WH52K03 vehicle cam in for intermitent abs and traction control light on. customer states that car has to run for awhile (like 5 min or so) before light comes on. if he just starts it and lets it warm up it will normally be on when he goes to leave. when i ran the car...	View
	2003 Chevrolet Trailblazer North Face 4.2L liftgate VIN: 1GNDT13S33 came in with door latch assembly taken apart. with complaint that the door would unlock. i put back together and starter over. the door was locked. but would not lock or unlock from the door switchs "any", i had all powers grounds actuator test good, tested al...	View
	2004 Chevrolet Cavalier LS 2.2L Fuel Gauge VIN: 1G1JF52F54 Good morning, Help? Fuel level inacurate on this gauge, reads 1/2 when empty and W A Y over when full, like the neadle hits the temp gauge needle. It acts like it wants to keep spinning when the key is on. Key off, and it returns to 3/4. Fuel level is Scanning...	View
	1995 GMC Jimmy SL 4.3L dead battery VIN: 1GKDT13W5S Is 300ma too much draw?	View
	1998 GMC Jimmy Envoy 4.3L battery drain VIN: 1G87T13W3W the problem is as follows :the customer drives it around its okay, it charges and starts , everything is working ok.Then he parks it overnite and it's dead in the morning.But it can also be ok for a couple of days,then it will be dead.All lites that are visabl...	View
	2000 GMC Yukon SLT 5.3L MIL Lamp on VIN: 1GKEK13T1Y This is the third time back for this vehicle with the same code P0440. On the first visit I did the normal diagnostic routine for this code, performed smoke test on system with Smoke Pro, when vent solenoid was comanded closed with scanner it continued to stay... Trouble codes: P0440 (Small EVAP leak)	View
	2002 GMC Envoy SLE 4.2L engine VIN: 1GKDT13S32 first time user we have a 02 gmc envoy with some top end noise hot or cold. i am not sure if it is the lash adjusters, over head cam, or rockers. any one have any idear or seen this problem.	View
	2005 Hummer H2 6.0L ignition switch/key VIN: 5GRGN23VX5 Came into shop with check engine light on, transmission not shifting. Codes p0740, p0753, p0758, p0785 all present. We found a bad connection at transmission wiring harness, was not locked into other connector. Corrected wiring at trans, cleared codes, test dr...	View
	1968 Oldsmobile cutlass s 5.7L fuel leaking VIN: 3367781131 i am restoring a 1968 oldsmobile cutlass. the fuel tank has 1 fuel supply line from the sending unit in the tank, but the tank its self has 2 fuel vapour fittings on the right front top corner of the tank. there were no lines attatched to these 2 fittings & fu...	View
	1996 Pontiac Grand Am SE 3.1L Steering VIN: 1G2NE52M5T This car has had very small leak in each bellow of the rack unit for several months, if you keep the fluid full, all is fine. Recently the customer complains that while driving at highway speeds (50-70 mph) the car sometimes tries to steer itself. Sometimes it...	View
	2004 Pontiac Sunfire SE 2.2L Cuts out, Stall VIN: 3G2JB52F34 hello i have this sunfire thats suppose to stall and the re- start without a problem. i've drove this and have never had it stall on me ever.have checked fuel pressure (60) and lab scoped the pattern,it looked ok.scaned the computer, no codes& data looked ok ....	View
	2000 Saturn SC2 1.9L Clutch Master cylinder VIN: 1G8ZR127XY We had a low clutch pedal, and slight fluid lead out of the clutch master cylinder. Replaced clutch master cylinder, but now can find no place to bleed slave cylinder. We tried pressure bleeding cluch, but did not work. I see that Saturn only sells this as a...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1995 Buick LeSabre Custom 3.8L Misfire, MIL Lamp on VIN: 1G4HP52L6S ecm driver bad thank you for all the help.all inputs were there the driver would intermittently turn off Trouble codes: P0341.	17
	2001 Cadillac Catera 3.0L Misfire, MIL Lamp on VIN: WO6VR54R61 sorry guys for not getting back to you. i havent been using the computor much. i ended up changing the maf sensor and problem is fixed. thank you all for the help. greg Trouble codes: P0171 (b1 lean), P0174 (b2 lean).	10
	1992 Chevrolet Lumina 3.1L MIL Lamp on, High idle VIN: 2G1W154T9N Thank you all for the response. I did check for vac. leaks and CTS-both ok. I tried disconnecting the AC transducer and coolant level sensor each time letting customer take it home. Didn't make a difference. This condition doesn't happen every day. In a month ... Trouble codes: 35 (IAC problem).	20
	1994 Chevrolet C3500 Cheyenne 6.5L engine VIN: 1GBKC34F5R well Everyone confirmed that the compression was way too low. Dale from N.C. hit it on the head, the rings were washed out. I also performed a leak down test and found 60 - 70% leakage past the rings. Now I was thinking motor, as did a few of my responses. To ...	6
	1998 Chevrolet Tahoe 5.7L No Start, Cuts out VIN: 1GNEK13ROW thanks for replies could not duplacte problem because of need to start in emergency situation i recomended he see dealer	6
	2001 Chevrolet Express 1500 LS 5.0L No Start VIN: 1GNFG15M11 thanks for all the replies. turned out that it was a bad cap from part source. cust installed. found it buy doing compression test with 1 and 3 cyl off van would run. so cap was definitly the problem.	27
	2001 Chevrolet Express 3500 5.7L Misfire VIN: R911190751 the problem is fixed thanks to the 4 that replyed. new dist. fixed the problem but now i have another van from the same ompany with 0 compression on number 4. fun fun fun Trouble codes: 0300 (cylinder misfire).	4
	2004 Chevrolet Silverado 3500 6.6L Poor Fuel Economy VIN: 1GCJK33124 Found that truck had bad injectors talk to dealer said 7 years 200,000 mile extended warranty only goes from 2001 - 2003 but they told me customer might get it extended to 2004 has to callGM & talk to them thanks to all that replied Trouble codes: 234 (turbo over boost), 1093 (fuel rail pressure low during power enrichment).	6
	1996 GMC C1500 Sierra SL 4.3L MIL Lamp on VIN: 1GTEC14W9T Once again thanks for all your help. As a few techs indicated putting in the 'wiring' update from the GM TSB for the 1996 Sonoma appears to have fixed it. The 'update' consists of a single wire but comes with excellent instructions on how to move the wiring ar... Trouble codes: P1122, P1406.	8
	2001 Oldsmobile Bravada 4.3L engine VIN: 1GHDT13W61 Thanx, pulled oil pan yesterday & found #1 rod bearing spun. This makes sense why noise would change depending on where it spun to. Appears to be no damage to crank or rod, & only minor damage to bearing. Throwin' this 1 in customers lap today & see what they ...	13
	1999 Pontiac Grand Am SE 3.4L Antitheft/Airbag/Trans VIN: 1GZNW52MZV Well im happy to say this ones fixed. I checked under the passenger seat and found no issues (I appreciate the info for future use though), but under further inspection found a 'disabled' aftermarket alarm in the car. Opened up the alarm controll box and found...	2
	2004 Pontiac Sunfire SE 2.2L speedo/tach VIN: 1G2JB12F04 customer droped off car used sweep test on cluster everthing worked fine except for tach.remove cluster & instal exchange unit,everthing works great.all pids on tech2 alway read normal thank you for all replies Dave	5

(Also Available: All, Asian, Chrysler, European, Ford, GM.)