GM Automotive Technicians Technical Discussion and Fixes for Sep 19, 2005 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1995 Buick Riviera 3.8L Cuts out VIN: 1G4GD22165 Need some advice on this one.cuts out by 3900rpm allways. Fuel trim 128 LT trim 143, trim cell16 maf 67.64 gm/sec., when it happens. Ordered a new fuelpressure regulator, should by in next week.	View
	2001 Buick Century Custom 3.1L Surge VIN: 2GHWB55K31 Howdy there, this one belongs to one of the techs, I'm the driveability guy and I just got out of the hospital and wont be back to work for a few days, (getting old sucks!). Before I went in I scanned it and it would bog severely on wot, would not go over 4k w...	View
	1995 Cadillac Seville STS 4.6L Traction Control VIN: 1G6KY5294S Good morning fellow techs. I have this '95 Caddy STS here that has a "traction Disabled" message coming on as soon as the car starts to roll, and a T073 setting in the TCS. This car came from a dealer who wanted to sell him a TCS computer, but he didnt trust t...	View
	1999 Cadillac Catera 3.0L Coolant VIN: W06VR52R7X We have this 99 Cadillac Catera with the 3.0 engine that came in about 3 months ago with broken timing belt and bent valves. We replaced with no problem as this was not our first rodeo with these cars. Car came in today with engine oil in the cooling system. C...	View
	1984 Chevrolet Corvette 5.7L Lighting VIN: 1C1AY0788E One of my techs has been trying to locate the diode module for the interior lamp system. Our component locator manuals, as well as our Mitchell On Demand, does not share this with us. 'Any one out there know its location on the car? Thanks in advance.	View
	1988 Chevrolet S10 2.8L Hesitation, Surge, Stall VIN: 1GCDT14R5G This tired old S-10 needs some help and so do I evidently. This truck will run real rough and often stall on start up, but is much worse after a hot soak of 15-30 minutes. All the basic things check OK, good spark and fuel pressure even when its acting up. I w... Trouble codes: 32 (EGR problem), 45 (rich exhaust), 44 (lean exhaust)	View
	1997 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNDT13WXV vehicle idles poorly. starts to stink from running over rich in exhaust. lacks power. scanner shows missfire on cylinders 1,3,&5. no indication of regulator leaking. from experience this usually causes 2,4,6 cyl to missfire. fuel pressure does not leak down. i... Trouble codes: P0300 (random missfire), P1133 (o2 insufficient switching b1s1), P0147 (o2 heater ckt b1s3)	View
	1998 Chevrolet K2500 Cheyenne 6.5L Excessive Emissions, Hesitation, MIL Lamp on VIN: S6WE114333 Have low power at times while accelerating with heavy black smoke. Worked on turbo first to see if causing problem with coded p0236. Control working and turbo working. Then moved on to egr codes, found when problem accured the desired egr and the actuall egr w... Trouble codes: P0401, P0404, P0236	View
	1999 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52MXX To get this veghical started you need to give the accelator about 1/4 throttle. if you just let it crank it will start and stall acts like flooding out. no codes fuel psi 40 with key on38 psi running. Also we have a 1999 pontiac bonnie doing about the same thi...	View
	2001 Chevrolet Malibu LS 3.1L No Start, theft light flashes VIN: 1G1NE52J01 Hi all, This car came in on the truck. It cranks ok. It has spark on all 3 front cyls. Fuel pressure is 54# cranking and holds w/ shut off. Volume is good. It has cranking speed, MAF flow readings, and all the correct cranking readings from the Snap-On Solus....	View
	2004 Chevrolet Avalanche 1500 5.3L starter motor VIN: 3GNEC12T84 this is mostly just a question.. we have a 2004 avalanch if the engine doesnt just start right up the starter motor will continue to RUN after the key is let go, just for a little while, seconds maybe.. we had a 2003 suburban last week with flex fuel engine al...	View
	1993 Pontiac Grand Am SE 3.3L No Start VIN: 1G2NE54N9P Got this from another shop. Some new parts installed already as listed in the repair history. Spark is intermittant and sometimes non existant. One interesting thing to note is the fuel injectors will continue to click( turned on and off) with the key on engi...	View
	1997 Pontiac Grand Am SE 3.1L valves I guess everyone gets to be a bonehead once in awhile. This car came in for a coolant leak at the intake. I took it off and replaced the gaskets and when I reassembled it, I got the pushrods mixed up on #6 cylinder and bent the intake valve. I have to tear it ...	View
	1999 Pontiac Grand Am SE 2.4L Stall VIN: 1G2NE52T9X Okay Guys, any help at all would be appreciated. Customer states that car will stall st stops. When We drive the car it runs like a dream, never stalls, wimpers, or moans. Checked codes, and base idle, cleaned throttle body, and returned the car. 2 days later ...	View
	2000 Saturn LS2 3.0L temp gauge VIN: 1G8JW52R3Y car temp gauge shows hot, upper hose and lower hose hot but radiator cold to the touch, just wondering if it is air locked or stopped up anybody else run in to this condition ?	View
	2000 Saturn LS1 2.2L engine VIN: 1G8JU52F3Y Need some help for a relative.I have never worked on a Saturn. My nephew has one he brought to me. It cuts out on acceration like a clogged catalic converter. It has a code PO170, running lean. Fuel pressure checks good, from 40-48 psi although it does jump al...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1974 Buick Riviera 7.5L reverse This was an interesting learning experience. I finally located the problem. It was the seperator plate. More specifically the triple layer shift kit sperator plate that was on the trans when I pulled it apart. It had major crossleaks between the plates and was...	8
	1991 Buick Park Avenue 3.8L Blower VIN: 1G4ZW53L9M Well as much as I hate to use pattern failures. Here we go again. I used Mitchell 1 and could not trouble shoot this problem. I think it should coach me thru problems like this in a logical and systematic manor but welcome to the real world. The silver bullet ...	8
	1992 Cadillac DeVille 4.9L digital lights on dash, fuel, and havac VIN: G6CD53B9N4 Thanks for the help. The problem was a bad 'new' part. Got a new rebuilt part and everything was fine. It is amazing how many people say that there new parts are coming in bad, wheres the Q.C. in these factories??? Thanks all.	3
	1997 Cadillac DeVille 4.6L hard start VIN: 1G6KD54Y6V Thanks to everyone who helped me on this one. The problem with this car was the fuel pressure regulator, actually the o-ring, but I did replace the whole regulator. When I removed the regulator the o-ring had a chunk missing out of it. I am assuming somebody w...	18
	1998 Cadillac DeVille 4.6L Hesitation, Cuts out VIN: 1G6KD54Y1W I THINK this one is fixed. This happens VERY intermittantly, and if it happens again, I will update this post. Here are some more facts that were omitted on my original post: When this symtom occurs, the car had to be turned off and then back on to work correc...	10
	1991 Chevrolet Beretta GT 3.1L Hesitation, Stall, MIL Lamp on VIN: 1G1LW13T1M I would like to thank all of you who replied. Most of you were right. I decided to cut the wires at the computer, I now have 5 volts. I was going to run new wires to the sensors but thought i would double check again. The wires that go to the a/c pressure swit... Trouble codes: 22 (tps sensor), 33 (map sensor).	11
	1993 Chevrolet C1500 Cheyenne 5.7L engine harness VIN: 1GCDC14KOP was sent a harness from IATN member that was almost perfect.thanks.	4
	1995 Chevrolet Blazer 4.3L unknown VIN: 1GNDT13W4S Received a lot of responses for checking torsion bar rear mounts, upper control arm bushings, shock, etc... The culprit was a defective wheel bearing hub assembly. It was replace by Goodyear 9 months ago and we replaced 2 months ago. The noise quieted down but...	31
	1995 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W2S Well I want to thank everybody that took the time to reply. a few people, like chad and rick said to check the harness as it passes through fuel tank, I have seen that before, so when I had the tank out to replace the fuel pump I had checked that. Kenneth, b...	20
	1996 Chevrolet Blazer 4.3L Knock Sensor VIN: 1GNDT13W4T Thanks everyone for your suggestions and knowledge. Yes it was an easy fix that we over looked. The Knock Sensor Module was removed from the old computer but never placed into the new one due to lack of communications on our behalf after i finally got the cust...	11
	1997 Chevrolet Cavalier LS 2.4L Misfire VIN: 4G1JF32T5V well this is fixed but not by us. I did hook up the fuel guage psi did not drop off the amp draw and pattern on the scope was fine. we had put a tps sensor on about 6 weeks ago I unplugged and test drove no miss it was an aftermarket sensor so we go a gm senso...	11
	2001 Chevrolet Silverado 1500 4.8L Poor Idle Quality, hard start VIN: 1GCEC14V4Y I had 14 replies and all said the problem was in the fuel pressure regulator leaking, they all were right. I want to thank all who replied I am grateful for the time they spent helping me. When I first checked the regulator I pulled the vacumn hose and looked ...	12
	2002 Chevrolet S10 LS 4.3L instrument cluster VIN: 1GCDT13W42 the customer has picked up this vehicle igniton switch tested good all possible grounds found was cleaned connections at pcm and body control module all cleaned i believe i need a tech2 to find this promblem !!! another thing found was a burnt connection at th...	8
	2003 Hummer H2 6.0L compressor ? VIN: 5GRGN23U23 Friends of the automobile repair industry- Good day, thank you for the seventeen replies which ranged from checking fan clutch, evacuation time, electric fan installation, ect. After replacing the condenser, accumulator and orfice tube, system cooling ability ...	17
	1992 Oldsmobile 88 Royale LS 3.8L MIL Lamp on VIN: 1G3HY53L8N Hi guys, I received twenty immediate replies all stating the same thing. The magnet must be replaced from the back side of the cam gear, so teardown is the only way. Everyone suggested replacing the chain and gears, one also mentioned a chain tensioner. No o... Trouble codes: 41 (Camshaft Position Sensor).	22
	1999 Oldsmobile Silhouette Premiere 3.4L Running lights and dash lights VIN: 1GHDX03E8X Turns out a blown fuse led to all of these problems. Got to remember to keep it simple. Thanks for the suggestions!	5
	1995 Pontiac Sunfire SE 2.2L belt tensioner VIN: 3G2JB1244S I put a new tensioner and belt still the same ending up going 1 belt size down dont know why but it corected the problem	4
	1997 Pontiac Sunfire GT 2.4L No Start, Cuts out VIN: 1G2JD12T5V thanks for all the help. i had checked every thing from fuel reg to spark and fuel pump to cap and coils turned out to be a camshaft senor. thanks for all of the replys.	12

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