Re: 2000 6.0L runs rough and stumbles
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Re: 2000 6.0L runs rough and stumbles
bad fuel pressure regulator I've seen it many time on these
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Re: 2000 6.0L runs rough and stumbles
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Re: 2000 6.0L runs rough and stumbles
Where is is the regulator on these things? Maybe I should change mine. BTW, when my truck broke a valvespring, the check engine light never came on when I thought for sure it should...
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Re: 2000 6.0L runs rough and stumbles
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Re: 2000 6.0L runs rough and stumbles
that is correct. it is on the drivers side fuel rail. check and see if it is good is by running the truck or cycle the fuel pump with the key, shut it off then up plug the vac line from it. If gas comes out of the port then it is no good. A nother sure way to tell is if your truck starts hard ie cranks over for a little bit before firing up. the pressure reg is a dealer only item and is just over a $100 bucks.
a broken valve sring wouldnt trip the check light. |
Re: 2000 6.0L runs rough and stumbles
i did not think of the valve spring but they are common on these style motors
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Re: 2000 6.0L runs rough and stumbles
I've got the same issues with hesitation and stumbling on my 2000 6.0. The fuel pump took a dive so I've already replaced that. I've put in a throttle position sensor, crank sensor,mass air sensor, and still falls on its face when you try to accelerate. I took it to a shop and had it plugged into a scanner that uses live feeds. It told me that 4 out of the 8 coils were missing under a load. I just ordered a set of 8. This truck has literally broke me lol
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Re: 2000 6.0L runs rough and stumbles
I forgot to mention that I also did a fuel filter and regulator when I did the pump. Also, keep a good eye on the fuel filler neck. Apparently they're known for rotting out and the rust falls down in the tank along with the outside elements. It was a mess!
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Re: 2000 6.0L runs rough and stumbles
Don't pay someone for a live fuel pressure feed. I was a mechanic and all we do is take off the engine cover and connect our mechanical fuel pressure gauge to the shrader valve and drive the thing. save your money.
I'd check pressure first then grab a bottle of brake parts cleaner and a roll of shop rags. Clean the throttle body, pull the egr valve and clean it out. then reach as far as possible into the intake if you don't have cash for injectors pull them out, remove all rubber and soak them in acetone over night You'll be amazed what it'll remove. Oh and when I said a can of brake parts cleaner I mean a case. A lot of problems with new gm motors are traced back to carbon build up and intake gaskets. But I'm new here so don't take my advice as Gospel. |
Re: 2000 6.0L runs rough and stumbles
I'd put money that it's not coils, and if you just bought 8 of em you wasted your money. I have never seen one go bad, not that they can't, but extremely unlikely that 4 went at one time. If you did have 4 dead coils you should be looking at power supply issues before replacing coils. Personally if they told you that it needed coils from just data streams and not actually testing anything, i'd say they are just tryin to suck ya for money and don't really have any idea what they are talkin about. What are the fuel trim readings at? O2 sensors responding properly? Have cats been checked to see if they are coming apart and plugging exhaust? Maf sensor readings and map/baro reading would be helpful as well. Would also check iac as well.
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Re: 2000 6.0L runs rough and stumbles
Come to find out.....I had a couple cooked plugs and a bad spark plug wire. I changed the plugs and got the one wire replaced and this truck runs better than it ever has! The wire was broken internally and it was arcing to the head. This thing is a beast!
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Re: 2000 6.0L runs rough and stumbles
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Re: 2000 6.0L runs rough and stumbles
I would seriously consider looking into the fuel filler neck and the fuel pump. The filler neck was completely rusted out so the rust, water, mud and every other outside element went down inside the gas tank. It was messy and a pain to fix and clean, but what a huge difference! My gas mileage even improved
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Re: 2000 6.0L runs rough and stumbles
good suggestions to look at but not an issue on mine. i changed the pump and filter a few yrs back and just had the bed off to do some body rust repair, filler neck is fine. im thinking a nother bad coil pack. have to bring it back to dealer to be scaned.
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Re: 2000 6.0L runs rough and stumbles
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Re: 2000 6.0L runs rough and stumbles
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Re: 2000 6.0L runs rough and stumbles
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