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truck running like c*ap...any ideas???

electromag8

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electromag8 Enthusiast

electromag8

Posted
Posted

SES light came on last night. My truck is skipping and running like garbage. If I punch it it seems ok, otherwise it is skipping like crazy. Codes are:

 

P0307- cylinder 7 misfire

 

P0137- Sensor circuit low voltage (bank 1 sensor 2)

 

I'm thinking maybe an oxygen sensor??? If so, where do I start. Any other ideas would be helpful and appreciated. This is killing me right now!!!!

I'm travelling 65 miles each way to work and can't afford to have my truck layed up.

commanche1 Enthusiast

commanche1

Posted
Posted

i know your feeling on having your truck out of service. if you drive to work, you have two choices , car pool is one,if not ,here is what i had to do. i bought a cheap second hand car to use. i got it for 1500.i only used it when my truck was out of service.if you have a relative that you could use their car, that would work to. i used the second car as my way of getting to work. i know your feeling.we all are driving to much of distance to work and cant car pool.hope this helps,been there done that! :lol:

budhayes3 Senior Enthusiast

budhayes3

Posted
Posted

I'd look at the cyl 7 misfire first- check the vitals- air, fuel, spark, compression...then take it from there. The one code could be related to the other, the misfire might be affecting that 02 signal.

electromag8 Enthusiast

electromag8

Posted
  • Author
Posted

I checked the spark plugs, and the #7 definetely looked different. I replaced the bosch platinums with AC/DELCO platinum plugs. Started the truck and it ran fine for about 3 minutes, the the service engine soon light came back on. Checked the code and it read:

 

P0137- cylinder 7 misfire

 

What do I do...what do I do??????

02 Silverado Z71 Enthusiast

02 Silverado Z71

Posted
Posted

Sounds like you have #7 injector staying open, which means it will keep dumping fuel when it should not.

 

Have a buddy crank the engine while you check for good spark at the end of #7 wire. If good spark, then replace #7 injector.

GMCSierra04 Enthusiast

GMCSierra04

Posted
Posted

A leaky injector would not cause a missfire code, mearly a high CO reading on the 5-gas analyzer. In a rich condition sernario caused by a leaky injector where the is excess fuel in the combustion chamber, it would be eaiser for the spark to jump the gap between the electrode and tip of the plug. This is because spark will transfer through fuel better than air, less resistance through the fuel. Oh, and dont pull the plug wire off and try to crank it, you will be making the ignition coil produce its maximum voltage and you could burn out the ICM for that cylinder.

 

Look for any loose or pulled out pins from the harnesses. I would look at the connection from the plug wire to the coil and then the plug wire to the spark plug. If you have access to a Digital Multi Meter than this makes your job a lot eaiser. You would check the resistance on that plug wire, should be about 950Kv, then if that checks than you could check the resistance of the ignition coil. Not sure what the specs on that coil are though. If all that is good than a compression test would be next up. You could have a plugged injector or a problem with that injectors wiring which would make a lean condition, causing a lean missfire. Good luck.

electromag8 Enthusiast

electromag8

Posted
  • Author
Posted

After swapping the coils from another cylinder, with no improvemnet. I decided to start taking things apart until I found a problem. Sure enough, the # 7 fuel injector was plugged with rust and crap!!! Continued on and cleaned all of the injectors with air and throttle body cleaner. Runs like a top now!! Thanks for thne help!!!

 

 

:thumbs::lol::P:D:cheers::cheers:

electromag8 Enthusiast

electromag8

Posted
  • Author
Posted

Took the truck to N.H. while towing 5,000 lbs. Friday. About halfway across the Mass. Pike, the problem reared its ugly head again...same code. Ran terrible and I averaged 7.5MPG. Took the truck to Portsmouth Chevy in N.H. and they replaced the #7 fuel injector on Saturday, ($140) I have put 450 miles on since then and the truck has run perfect. Averaged 9.9 MPG on the way back Saturday night. My hat goes of to Portsmouth Chevrolet for servicing my truck so fast on a Saturday and holiday weekend to boot!!!

 

:thumbs::flag::cool::banghead::banghead:

bigblock_454 Enthusiast

bigblock_454

Posted
Posted
SES light came on last night.  My truck is skipping and running like garbage.  If I punch it it seems ok, otherwise it is skipping like crazy.  Codes are:

 

P0307- cylinder 7 misfire

 

P0137- Sensor circuit low voltage (bank 1 sensor 2)

 

  I'm thinking maybe an oxygen sensor??? If so, where do I start.  Any other ideas would be helpful and appreciated.  This is killing me right now!!!!

  I'm travelling 65 miles each way to work and can't afford to have my truck layed up.

 

 

 

not sure if you fixed problem yet but dont forget to clear old codes or they will show up right away again.to clear just disconnect battery for a couple of mins

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