GM Automotive Technicians Technical Discussion and Fixes for Apr 20, 2006 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1978 Cadillac Seville 5.7L Poor Idle Quality, Hesitation, Stall, VIN: 6S69B8Q465 old cadilliac guys, not necessarily old guys, but guys who like old cadilliacs, i need your help. i need to locate a coolant temp sensor for this 1978 seville. this is the sensor for the efi. gm discontinued many years ago as did echlin (napa) and standard par...	View
	1992 Cadillac DeVille 4.9L Excessive Emissions VIN: 1G6CD53B4N Hello. We have a Cadillac De Ville in the shop which has not passed emissions tests due to high nox levels under load. Above readings also hint at very lean running conditions. Verified egr now works in reducing nox. Verified cat is also reducing well. Tried t...	View
	1990 Chevrolet R1500 Suburban Silverado 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1GNER16K8L This is my first post guys...seemed like a good time. This truck started running badly during mid-day with no warning signs about three weeks ago. Acted like it jumped time. Erratic idle, low power, stumbling and missing during acceleration. It was taken to ...	View
	1997 Chevrolet Astro 4.3L Pedal feel, brake response VIN: 1GNDM19W3V This van has a slow brake response at high speed. The problem is intermittent, but when it occurs, it is above 30MPH. When it occurs, the pedal nearly hits the floor, the van slows 1/2 rate, the pedal pushes back toward the normal position and the van stops pr...	View
	1999 Chevrolet Silverado 1500 4.3L Misfire VIN: 1GCEC14W5X Truck came in with miss when at cruise speeds. The plugs plug wires dist cap rotor and fuel filter had been replaced at another shop 2 or 3 weeks previous. We scanned for codes and found PO300 random misfire.When test driving miss was noticed at steady cruise,... Trouble codes: P0300	View
	2000 Chevrolet Lumina 3.1L abs module VIN: 2G1WL52J3Y drive vehicle short ways and abs light comes on.code set on my mt 2500 snap-on scanner is a 1226,which is excessive acceleration r/f wheel.i replaced all of the above parts+ i ohms out all wires related to r/f sensor,they are all good i of course checked all f...	View
	2001 Chevrolet S10 2.2L evaporator VIN: 1GCCS14521 Good morning all! I have this S-10 that if you drive it for a couple of hours the evaporator will freeze up. We have weighed the freon anf replaced the high pressure/temperature switch to no avail. This is a manual system and it does not have a low pressure s...	View
	2001 Chevrolet S10 4.3L Starting System VIN: 1GCDT19W71 This truck has an intermittent no start concern. The concern is that sometimes when you turn the key to the start position nothing happens and all the lights go out on the dash there is no click just nothing no noise or anything and you might hold it in the st...	View
	2001 Chevrolet Monte Carlo SS 3.8L No Start, Stall VIN: 2G1WX15K21 Hi folks, This is my daughters car. Car would not start for her one night two weeks ago. I arrived and it started and drove. I tested the fuel pressure which was within specs for KOEO and KOER. With the car in the shop I had another no start. This time with n...	View
	2002 Chevrolet Avalanche 1500 5.3L xfer case/4wd VIN: 3GNEK13T12 Replaced front and rear axle seals; had to leave Key on. Battery died; after new battery and during test drive, selected 4HI, then shifted to 2HI, cruising at 25 mph, accelerated, drivetrain felt like it was binding up, "SERVICE 4WD" light was flashing and ble...	View
	1993 GMC Jimmy 4.3L Excessive Emissions, Stall, MIL Lamp on This Vehicle came in running very rich. It has lots of codes. I am at home and don't remember all info. I will add the rest of the details tommorow. The scan data shows -40 Coolant, -40 MAT, TPS 0V, MAP 0V. There is a PROM code 51. I have Replaced the PROM and...	View
	1998 Oldsmobile Bravada 4.3L Stereo/CD Player VIN: 1GHDT13W4W Hi Guy's Today we have this Bravada that the battery drains and goes low in a time frame of three days not totaly dead but just won't turn the starter over. It has a new battery, I have located a small drain on the system of 7-8 mil amps at the stereo/clock me...	View
	2000 Oldsmobile Alero GL 2.4L Poor Idle Quality VIN: 1G3NL52TOY hellow all, i have this olds alero with a 2.4 that has a bit of a high idle, it idles around 1100 to 1200 in park and at about 800 to 900 in gear with foot on the brake. this morning i found that the intake gasket was leaking a little bit so per service writte...	View
	1996 Pontiac Grand Am SE 2.4L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy VIN: 1G2NE52T4T when the car showed up it had a bad fuel pressure regulator. i replaced it. i replaced the crank pos sensor, cam pos sensor, ignition module, knock sensor module, computer (ecm) and then sent computer back as it did not help, spark plugs, and the fuel pump and... Trouble codes: 300 (random misfire), 301 (random misfire cyl 1), 302 (random misfire cyl 2)	View
	2003 Pontiac Bonneville SE 3.8L warnings VIN: 1GZHZ54183 Codes C1245 and C1287 … Tire pressure warning and Stability system warning. Customer’s complaint was warnings. Did find nail in one of the tires, repaired. Then found that we were unable to reset tire pressure through dash (DIS) system. Finally after borrowing...	View
	1999 Saturn SW2 1.9L Unknown VIN: 1G8ZK8279X Howdy there, We dont see many of these, the dealer gave up on it. The complaint is intermittent stall, It did it for me with the scanner hooked up, the converter stayed locked up until it came to a shuddering stop and stalled the engine. Retrieved code p1599 n...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1991 Cadillac DeVille 4.9L Car accellarates VIN: 1G6CD5387N Thanks to all who replied. Sorry for the delay. Customer picked up car as I was waiting for replies. Customer kept car longer than I anticipated. Well, The fix was replacing the ISC and performing the relearn through the PCM. I had quite a few replies regardin...	16
	1991 Cadillac Allante 4.5L Unknown VIN: 1G6VS3384M Hi guys, thanks for all the advise in your replies...one good thing with IATN is the variety of replies you receive that you can learn alot from even if they are not the exact fix for your current problem. there is alot of helpful advise in your replies that I...	4
	1988 Chevrolet Nova 1.6L system does not charge and lights are on dash for VIN: 1Y1SK5143J Thanks for your help. Replacing the alt. took care of the alt. and brake light. Apparently the charging fuse looses its power when the lights are on. After replacing the alt. there now is power on charge fuse all the time. Thanks again. Greg	4
	1994 Chevrolet Astro CL 4.3L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1GNDM15Z3R James from california got it right.It was fuel pressure regulator.The van is our preachers and he`s always on the go hes has over 200,000 miles on the van.He rebuilt the motor himself and is a pretty good mechanic.We could never get him to slow down long enoug...	7
	1994 Chevrolet Lumina Euro 3.1L Poor Idle Quality, Misfire VIN: 2G1WN54T8R found coolant when removed valve cover in motor, repaired problem intake and put back together with new oil ran fine thanks to all that replied	16
	1995 Chevrolet C2500 5.7L MIL Lamp on VIN: 1GTGC4589I thanks to all who took the time to try to help with this truck. This vehicle is not fixed yet I can add some useful information regarding where we are in diagnosis. First of all, there was no welding done on exhaust system which could have damaged the control ...	14
	1996 Chevrolet Lumina 3.1L Poor Idle Quality VIN: 2G1WL52M1T thanks everyone ecm fix this one all my power and groundscheck good.i did remove iac motor with the key on and the motor bumped no movement when the new ecm was in,iac motored out	16
	2000 Chevrolet Impala LS 3.8L 4th gear VIN: 2G1WH55KXY thank you for the replies. ray from pennsyliviana said that this is a normal condition, there is no engine braking in 4th gear. joe, a gm instructor from tennesse stated that this is a codition that the tsb i mentioned would fix. the customer is considering tr...	3
	2001 GMC Sierra 1500 SL 4.8L MIL Lamp on VIN: 1GTEC14V81 after i loss the rest of my hair, checked all good input from emails,tried a mass air flow sensor from identical truck still the same, installed o2 sensors same results,tried pcm from other truck, same then i recieved another email on fuel quality, hook up inj... Trouble codes: P0171, P0174.	15
	1993 Pontiac Grand Am SE 2.3L No Start VIN: 1G2NE5436N hello helpful members. well it turns out that the module was the problem. although we tried two modules already. it turns out they were both the wrong module (used and new). the modules look identical but the later design has less pins and uses different logic...	10
	1996 Pontiac Grand Am GT 2.4L Misfire, MIL Lamp on VIN: 1G2NW12T8T thanks to all who replied...I will be sure to check ground system and test it if vehile acts up again.. customer needed car..looks like we are using comprable parts and are torquing plugs...also using dieletric grease...will write back if experience problem ag... Trouble codes: P0300.	8
	2000 Pontiac Sunfire SE 2.2L key cylinder assy VIN: 1G2JB12474 Gentlemen I have the problem repaired. As stated before when the key was turned all the way to crank there was no current from the starter selnoid post. At first I changed the switch as the key had the spring back action you would expect to feel in the crank...	3
	2003 Pontiac Grand Prix GT 3.8L engine fasteners VIN: 1G2WR52133 Hi group, It was pretty unimous to replace the bolts. The problem with replacing rod bolts(as is common practice in machine repairs and also stated by GM)is the rods should be reconditioned. To recondition them you would need to torque the caps with the new bo...	9
	2003 Pontiac Grand Am SE 3.4L Surge, MIL Lamp on VIN: 1G2NF52E83 I'm closing this request for now...so far, no cause has been found. Those who responded suggested checking the fuel pressure regulator for leakage (I did, and found none) and the EVAP system for a full canister (I did, no change). I also checked backpressure a... Trouble codes: P0172 (system lean).	5
	2001 Saturn LW300 3.0L remote locks/ headlights/ starter VIN: 1G8JW82R71 Sent to dealer and they replaced the body computer and it fixed it. Thanks for the help	6

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