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6.0 Rough Running, No Power

scottishmaximus

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scottishmaximus New Member

scottishmaximus

Posted
Posted

I've got a 2001 Chevy 2500HD 4wd. Sometimes when i try to start it, it cranks, but doesn't start. When I try it a second time it always starts. This went on for a while and didn't bother me too much. Now i have more problems.

 

It started sputtering upon acceleration and then it would miraculously go away and run fine. From time to time it would do this and it eventually got worse. I replaced the sparkplugs, which were pretty ugly looking and all had a gap the size of Texas. I also replaced the wires as one broke trying to get it off. This didn't change anything. In the meantime it developed an exhaust manifold leak that got pretty bad and we ended up replacing both manifolds as they were rusty, cracked, and bolts broke in the process. We also replaced the engine mounts which were completely gone and had the engine sitting slightly off to where the fan rubbed it's shroud.

 

Now my problem has escalated and the truck ran mostly smooth, would wind up, but really had no power. It would ping at high rpms. Now today it would barely move itself, and ran extremely rough.

 

Any suggestions?

Genuinefine409 Enthusiast

Genuinefine409

Posted
Posted

I'd start by getting it scanned for codes. It could be several things. knowing the codes would help point you in the right direction. Autozone and I think advance auto will scan your codes for free.

scottishmaximus New Member

scottishmaximus

Posted
  • Author
Posted

I just got back from autozone and their scanner said P0300.

Cylinder misfire detected - Random cylinders.

 

Probable Causes:

 

1. ingnition system faul - spark plugs, ignition wires, coil

 

2. vacuum leak

 

3. injector fault

 

4. high or low fuel pressure

 

Any idea what common problems are or what to look for next? I did replace the air filter. The gauge said it was ok, but it looked fairly dirty. The metal honeycomb in the intake had grey soot on it.

scottishmaximus New Member

scottishmaximus

Posted
  • Author
Posted

I should also note that I also have what sounds like a bolt spinning in a drum that almost sounds like it's in the bellhousing area. I thought this was related to a friend pulling the engine to do the exhaust manifolds (bolts broke and he thought it would be easier to get a drill on the bolts by pulling the engine out than to remove only the heads. I figured the sound was related to this as it started soon after.). I found a post on another forum that seems to be just like my problem.

 

I have a 2001 chevy silverado (110,000) that was making a bolt in spinning drum type of sound from the bellhousing area. I was told by several people it was either a cracked flexplate or or bad torque converter. Needless to say, I pulled the transmission, flexplate was fine, so I replaced the entire transmission with one of half the miles. The noise is still there (starter is possibly sticking), but when I replaced the transmission, I also did plugs, sires, and a pcv valve.

 

A few days later after getting up and running, the service engine light came on. Engine ran fine, no stumbling, hesitation,no transmission slippage, nothing. Couple days later i needed gas, and filled up, about 5 miles within the gas station the engine started stumbling, sometimes so bad i thought the engine was going to die. I had abuddy scan it, and came back as p0300 and p0430 bank 2. Now after resetting the gaps on the plugs, replacing the wires again, the idiot light shutoff while STILL having a hestiation and stumble. I did not clear the codes.I gave it 2 cans of sefoam, 1.5 in the tank, and the other in the vacuum line. The hesitation and stumble is not nearly as bad as before, and it is hit or miss. Sometimes it will do it and sometimes it will not. It will do it going up a hill or with trying to acclerate quickly.

Talked to a local dealer, and they said midwest gas stinks and said it was possibly a fuel pressure regulator. The gas doesn't make much since because the light was on before the fillup, but then again it didn't hesitate or stumble until after. I plan on changing the fuel filter and doing a fuel pressure check, but it is a blizzard outside, seriously.

 

The engine revs fines,but once under load it will stumble.

Let me know if more information is needed.

Thanks

 

He didn't say what he did to solve this, but if anyone knows, any help would be greatly appreciated.

 

Thanks, Scott

  • 7 months later...
MichaelBrownlee Enthusiast

MichaelBrownlee

Posted
Posted
I've got a 2001 Chevy 2500HD 4wd. Sometimes when i try to start it, it cranks, but doesn't start. When I try it a second time it always starts. This went on for a while and didn't bother me too much. Now i have more problems.

 

It started sputtering upon acceleration and then it would miraculously go away and run fine. From time to time it would do this and it eventually got worse. I replaced the sparkplugs, which were pretty ugly looking and all had a gap the size of Texas. I also replaced the wires as one broke trying to get it off. This didn't change anything. In the meantime it developed an exhaust manifold leak that got pretty bad and we ended up replacing both manifolds as they were rusty, cracked, and bolts broke in the process. We also replaced the engine mounts which were completely gone and had the engine sitting slightly off to where the fan rubbed it's shroud.

 

Now my problem has escalated and the truck ran mostly smooth, would wind up, but really had no power. It would ping at high rpms. Now today it would barely move itself, and ran extremely rough.

 

Any suggestions?

 

 

did you fix this problem, mine has been doing this for a while in really cold weather, like to took about 6 times cranking it over intil it started, and it was -35 C outside. just last week i just put on new pluges and wires, and fuel filter. could it be the fuel regulator frezzing up?

RJG183SA Enthusiast

RJG183SA

Posted
Posted
I've got a 2001 Chevy 2500HD 4wd. Sometimes when i try to start it, it cranks, but doesn't start. When I try it a second time it always starts. This went on for a while and didn't bother me too much. Now i have more problems.

 

It started sputtering upon acceleration and then it would miraculously go away and run fine. From time to time it would do this and it eventually got worse. I replaced the sparkplugs, which were pretty ugly looking and all had a gap the size of Texas. I also replaced the wires as one broke trying to get it off. This didn't change anything. In the meantime it developed an exhaust manifold leak that got pretty bad and we ended up replacing both manifolds as they were rusty, cracked, and bolts broke in the process. We also replaced the engine mounts which were completely gone and had the engine sitting slightly off to where the fan rubbed it's shroud.

 

Now my problem has escalated and the truck ran mostly smooth, would wind up, but really had no power. It would ping at high rpms. Now today it would barely move itself, and ran extremely rough.

 

Any suggestions?

 

 

did you fix this problem, mine has been doing this for a while in really cold weather, like to took about 6 times cranking it over intil it started, and it was -35 C outside. just last week i just put on new pluges and wires, and fuel filter. could it be the fuel regulator frezzing up?

 

 

How old is your battery?

 

What is your fuel press.? FPR failure is quite common. Low fuel press. would cause hard / rough starts (not enough fuel to richen on cold start-up).

  • 10 months later...
03Sierra434 New Member

03Sierra434

Posted
Posted

I have an 03 6.0L and I also had an exhaust manifold leak at one time. Being the "Do it yourself" guy I am, I replaced the manifold gasket and in doing so got some debris down the wye pipe and clogged one of my catalitic converters, the one on the side I worked on. This is how I know it was my fault. At a $700 mistake I am more than happy to explain this to others. I was driving on the highway and lost almost all power, truck wouldn't even climb hills. extremely rough idle. brought it to the local shop and he had no idea why it was reading misfires codes all on one side of the motor. I slack chained it to a dealer who told me in 5 minutes it was the cat. I also heard the "bolt rolling around." If anyone else experiences this, Clogged Catalitic Converter, FOR SURE.

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