Engine check lite
 

I had a problem with my 2000 3500 1 ton running down the road it would stumble ,fart, wheezze, then go back to normal. May be do it the next time i drove it or not for several days. So i had new plug wires cap and rotor replaced. Drove it a block from repair shop and bang the same thing agin. They check it and said a little low fuel pressure. So i have a new fuel pump put in. Drive it a day same thing but now it happens slow speed just off idle. Take it back this time engine check light comes on code po 339 bad crank sensor put a new one in drove it agin for a day now ruff idle and the fart and wheezze again. Garage looked on his test book on line said possible wire problem from ecm to crank sensor no new codes. My truck has 199,000 miles on it but i dont drive it like she be stolen. Got it back today running ok for now . So where can i find a wiring diagram for this truck they opened bundle looked at the wires maybe moved the wire from where it was also when the fart,wheezze happens the tack needle goes crazy thanks for some help on this

Re: Engine check lite
 

Still looking for help

Re: Engine check lite
 

assuming 6.0?

change out the fuel pressure regulator on the fuel rail yet? with 199k i would guess its time for a one of those. I have 192k on my 2003 2500HD and its starting to do some of those same things you describe, STARTING to do those things. its also once in a great while hard to start and wont idle for **** right after starting. I am 99.999% certain this is my problem. its a 60$ part at oreileys but i bet you could find em for cheap(er) elsewhere. and is an ALMOST tool-less job.

just a thought. maybe someone else can contribute their opinion?

--izzy

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Well I got a bit of help today had a guy that is a guru with reflash computers read mine in my truck he said that 4 months ago mine showed battery fail well I put a new battery in the truck 4 months ago now yes it needed the crank sensor. now the computer is looking for what cylinder is miss firing and it is jumping cylinder to cylinder trying to sink with cam sensor he hacked it and told it to relearn well i left with a better idle still small miss at idle put it to the floor an no fartin whezzzing he said drive it a few days and if it still has problem come back. All for 40.00 and a 6 pack for 30 min work had another shop charge 96.00 to tell me it needed the crank sensor for 5 min bet I don't go back to that place. Time will tell

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Engine is a 454 vortex 7.4

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problem is back must be a bigger problem then they think next check wiring to the crank sensor

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Any better ways to describe than fart or wheeze? Ask a mod to move this into the 88-98 section(GMT400)

What codes are you getting?

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check the mass air flow. they make a cleaner for it at your local parts store. take it off the truck. its the part that has the wiring harness by your air filter box.
also check the wiring connector and wiring harness for the maf for any bare wire.

the maf is responsible for the majority of all the running parameters with the obd2 systems. fuel and spark mainly but it will also mess with tranny shift points and cause alot of erratic problems

my 6.0 was kinda doing that, felt like it would almost loose a cylinder or 2 then go back to normal and i found out that a wire for my maf was rubbing on my cold air intake and started grounding out

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code po339 have replaced crank sensor sill get the code

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I may be way off base here, but I would take the cap off the distributor and push, pull, and try and turn the rotor. I had a cam shaft eat a distributor gear, complete failure stopped me in my tracks. But, if the camshaft has worn down or worn out the distributor gear it will try and fire at inopportune times.

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Problem still there now code po 300 with code po339 any help out there

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SHAZZZZZZAM I GOT IT FIXED. Did it my self all the parts changers never looked at the wire loom from crank sensor to computer the A pin wire damaged only gave part time signal to the computer. I replaced the connector and wire from sensor to up behind the alternator. she runs like the ol Dog she was jump on the gas and spin the duels out back. Im happy agin so always check the wiring guys

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glad you got it figured out! thanks for letting us know!

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STILL HAD A SMALL MISS PUT IT ON A SCAN MACHINE AN ENGINE STILL HAD A RANDOM MISS FIRE ON CYLINDER 3 AN 5 MISS ON 3 20,000 511,000 TIMES OTHER CYLINDERS 100 TO 200 TIMES SO I DUG A LITTLE DEEPER IN THE PROBLEM TEST BACK PRESSURE ON BOTH CAT CONVERTERS LEFT BANK WHERE MISS WAS AT THE CAT HAD HIGH BACK PRESSURE OF 34 LBS RIGHT BANK 2 LBS BACK PRESSURE SO I REPLACED LEFT CAT ALSO RUN A PINT OF INJECTOR CLEANER NO NAME FROM A SMOG SHOP THAT THE OWNER SAID I USE THIS ON USED CAR LOT CARS TO CLEAN IT UP TO SMOG BUT YOU CANT BUY THIS IN CALIFORNIA MUST BE SOME GREAT TIGER PEE. SO NOW SHE CLIMBS UP THE GRAPEVINE ON I 5 WITH 8000 LBS OF TRAILER START AT 70 MPH AT THE BOTTOM AND TOP OUT AT THE TOP AT 55 MPH/3200 RPM IN DRIVE NEVER HAD TO GO TO SECOND GEAR ON THE PULL UP. THIS IS A GREAT GENERAL MOTORS TRUCK AGAIN :devil:

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GRAPEVINE IS A 5 MILE PULL UP BOTH SIDES BAKERSFIELD AND LA :gmc2: