GM Automotive Technicians Technical Discussion and Fixes for Mar 25, 2010 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1998 Cadillac Eldorado ESC 4.6L No Start VIN: 1G6ET1291W New ignition switch with wires for Theft system. Verifyed that key was being picked up now. Still car won't start.	View
	2005 Cadillac SRX 4.6L Pump/Pressure Hose VIN: 1GYEE63A65 I have a power steering fluid leak at the pressure hose quick coupler at the pump. It is leaking from the coupler itself. The GM parts diagram is not clear and in fact appears to be wrong. It shows the seal and coupler available seperatly from the hose itself....	View
	1996 Chevrolet Express 1500 5.0L Hesitation, Surge, Stall, MIL Lamp on VIN: 1GBFG15M0T rplaced dist due to oil inside. maf was replaed and o2s unplugged. have volage on pink wire	View
	1998 Chevrolet S10 2.2L Misfire VIN: 1GCCS1944W misfire at idle to off idle with code no.4 misfire someone has replaced plugs/wires if add acetylen threw intake misfire goes away ck. for vac.leaks none inj.puls width same on all listen to inj.is working replaced inj. misfire gone on no.4 cyl.but now no.3cyl... Trouble codes: P0300	View
	1998 Chevrolet Cavalier LS 2.2L theft system VIN: 1G1JC5241W I bought this car with a no start theft deterrent problem I run scanner and found code 1629 which is no sig between ipc and comp normally an ign lock cyl replacemant cures this problem it did not with further checking I founf the theft chip in the ipc was melt...	View
	2000 Chevrolet C3500 5.7L Surge, MIL Lamp on VIN: 1GBJC34R2Y All GM Techs HELP??? This vehicle came in after one of the engine replacment shops installed a reman engine. In the beginning I found many bolts loose and some missing, codes P0141, P0154, P0161, P0327, P0338, P0341. After many hours of testing, wiring repairs... Trouble codes: P0341 (CMP Sensor Circuit out of Range)	View
	2003 Chevrolet Cavalier 2.2L No Start, Stall VIN: 1G1JC54F83 Got this 2.2 that died while driving and now cranks but won't fire. No codes stored anywhere. We have fuel pressure, injector noid light lights up, spark at all cylinders. Crank signal is showing on scanner and also with test at sensor harness. No cam signals ...	View
	2005 Chevrolet Silverado 2500 HD LT 6.6L MIL Lamp on the options are replace the fuel pressure sensor or the fuel injector, we havn't worked on any of the duramax diesels and was looking for insite on the p1093 code. Trouble codes: P1093	View
	2006 Chevrolet Express 3500 6.0L oil pressure VIN: 1GBJG31U36 Help all GM Techs. Van came in with complaint of low oil pressure gauge going down and check gauges light coming on. Found oil sending unit leaking into plug. Replaced sending unit and cleaned up plug. No change in operation. While everything was still on the ...	View
	2007 Chevrolet Silverado 2500 HD WT 6.0L power steering pump VIN: 1GBHC24UX7 We replaced the pump and customer returned with complaint of noisy pump. The hard steering problem went away. We have flushed this system several times and replaced the pump again. It is very noisy at higher rpm, 2000+. The alternator is noisy but this sounds ...	View
	2001 GMC Savana 1500 4.3L No Start VIN: 1GTEG15W01 The truck came to the shop with a no start condition, the crank sensor was broken, we noticed a big end play on the crank shaft, we had to rebuilts the engine. since then when we start, the engine kick like a bad timming. we replaced the computer , the crank s...	View
	1976 Oldsmobile 98 Regency 7.5L Mechanical VIN: 3X37T6M144 We are looking to retrofit this R12 system to R134a and looking for information regarding refrigerant oil,compressor,drier,orifice,etc. compatibility and changes. We do perform retrofits but not on vehicles this old.	View
	1994 Oldsmobile 88 Royale LS 3.8L Poor Idle Quality, Cuts out VIN: 1G3HN5218R Car came to me with real irratic idle (almost like a cylinder was binding) Checked fuel pressure and spark( no misfires detected)Cleaned injectors with no improvement.Checked fuel flow with meter, checked good. The customer did let the car set for over a year ...	View
	1987 Pontiac Grand Am SE 2.5L Cuts out, Misfire VIN: 1G2NE14U8H This one has me pulling my hair out. 87 Grand Am with 2.5 TBI engine, has misfire under load with severe bucking and popping back through tbi unit,manual transmission and cannot duplicate in shop. Fuel pump was replaced about 1 year ago and fuel pressure stays...	View
	2005 Pontiac Grand Am SE 3.4L No Start VIN: 1G2NE52E85 after battery replaced last week.car started and ran perfect.customer called a few day later saying car will not start.cranks but no run.car came in on hook today,tow man says it started for him.no start when i tried it.checked for pcm codes.none found.checked... Trouble codes: U1000, U1088, B1327	View
	2003 Saturn Vue 2.2L Mechanical VIN: 5GZCZ43D53 Looking for advice before I jump in. This VUE has a CVT trans that that's inop. Symptoms are no drive in forward gear- engine stall in reverse. Obvious trans issues, and a well known dog for trouble. I think it's a belt / pulley problem. I wonder if I can serv...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1986 Chevrolet Celebrity 2.5L heater Thanks to all replies! This car proved too be stubborn. I ended up removing heater hose from heater pipe and allowing coolant to pass through heater core while engine running and warm. This helped but not 100% but seemed to help. Customer has no complaints ...	18
	1999 Chevrolet Malibu 3.1L No Start, hard to start VIN: 1G1NE52MXX idle air control valve did fix this problem thank you for everyone who replied this is an awesome network	21
	2004 Chevrolet Trailblazer LS 4.2L timing chain VIN: 1GNDT13S74 ordered up a tensioner kit so i could get a good look at the tensioner, then played with a hanger for a 1/2 hour then i gave in and tore it down. its a hard hook when you've never been into this engine before. no knowing how long it takes to tear it down, if i...	4
	2005 Chevrolet Uplander LS 3.5L Power sliding door VIN: 1GNDV23175 thanks for the help guys. I still haven't found the problem. I tried to clean the contacts with an eraser, checked the grounds for the system. My only thought is the power sliding door module is the problem. It acts up intemittently so it is hard to get it...	4
	2006 Chevrolet Silverado 1500 LT 5.3L Misfire, Poor Fuel Economy VIN: 2GCEK13T16 after doing all possible testing. i concluded there was an internal problem, after pulling the head off i found the lifter had scoring marks on it. looking further down i felt the camshaft lobe worn, replaced engine and problem solved thanks everyone for your... Trouble codes: 300 (multiple misfire), 304 (cyl. 4 misfire), 303 (cyl. 3 misfire).	22
	2003 Pontiac Grand Am SE 3.4L oil pressure VIN: 1G2NF52E73 just about everyone was right. I thought the relief valve was the problem from the start,but I didn't know it was in the oil pump,and it was hard for me to beleive the engine would be slugded. My customer takes very good care of his car, but there was a 1/4 in...	18
	2003 Pontiac Grand Prix SE 3.1L No Start VIN: 1G2WK52J03 Well just need to say thanks to all who replied. Robert from Ohio pushed me in the right direction with his comment about the cam sensor. With using the Tech 2 it does not give you a pid for the cam sensor. So i pulled out the Verus to watch cam pid. When cra...	7

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