6.9 no power
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6.9 no power
I have a 6.9 that has no power. i just put rebuilt heads on it new fuel pump and injectors. the truck has no power. it starts fine even when its 14 out. dosnt smoke at all. could it be the injector pump. the truck used to haze black smoke under load. now climbing a slight grade it just bogs down and no smoke.
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From: Bellefontaine, OH
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it ran like crap but the heads gasket was blown between cylinders and it was only running on 6. I messed with the timing but it didn't make much of a difference.
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Being me, I'd adjust the fuel screw up until you have black smoke under heavy acceleration, then back it off a hair till it stops really smoking.
The 'proper' thing to do is install a EGT sensor if you're doing this, but it's a start.
Also, timing can help, though only if you're getting enough fuel in the first place.
The other thing I'll point out: altitude matters. If you're at signifigant elevation, you're getting less air pressure(and thus, less to burn) than at sea level. If you can't get enough power out before getting loads of black smoke(i.e. incomplete burning due to lack of air), it might be time to install a turbo(which, knowing what I know now, I wouldn't run one of these trucks /without/ a turbo, if I could help it).
The 'proper' thing to do is install a EGT sensor if you're doing this, but it's a start.
Also, timing can help, though only if you're getting enough fuel in the first place.
The other thing I'll point out: altitude matters. If you're at signifigant elevation, you're getting less air pressure(and thus, less to burn) than at sea level. If you can't get enough power out before getting loads of black smoke(i.e. incomplete burning due to lack of air), it might be time to install a turbo(which, knowing what I know now, I wouldn't run one of these trucks /without/ a turbo, if I could help it).
Laughing Gas
Joined: May 2009
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From: Maine
The thing is...did your recent work cause the current symptoms, or did the symptoms pre-date the work?
Roy
Laughing Gas
Joined: May 2009
Posts: 854
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From: Maine
BTW, no one has mentioned fuel delivery to the injector pump. In-tank strainer, fuel filter, fuel selector valve, fuel lines. I'd think about a fuel pressure and volume test. I know the new LP makes it seem like fuel is not the problem, but...
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it ran fine before the head gasket went. the truck did sit for a while before I got time and money to fix it like around 6 months. is there something in the pump that could go that would cut the amount of fuel. I don't see how changing the heads could do anything. it was done with all new parts heads were fully rebuilt. new head bolts and all new gaskets. everyone keeps telling me to advance the timing but ive moved the timing and it dosnt really help.
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So, to lay it all out; blew a head gasket, installed rebuilt heads with gaskets and bolts. Also new lift pump and injectors. Injection pump is a 10 year old rebuilt unit. Correct?
A few questions:
How was the injection pump pulled when the heads were replaced, unbolted from the front, or did someone pull the IP housing & gear out?
Filters are all good (Fuel, Air, Water Seperator)?
Any chance of a compression or leak-down test being done since the new heads were on?
Any noticeable difference when IP timing is changed?
What codes were the old injectors vs new injectors? (BB, D, etc)
How much blow by is coming through the CDR?
Instead of throwing assumptions, it'd be good to go through the basics first and narrow it down to whether it's a fuel, air or compression issue. It's always the simple stuff that will bite you in the ***.
A few questions:
How was the injection pump pulled when the heads were replaced, unbolted from the front, or did someone pull the IP housing & gear out?
Filters are all good (Fuel, Air, Water Seperator)?
Any chance of a compression or leak-down test being done since the new heads were on?
Any noticeable difference when IP timing is changed?
What codes were the old injectors vs new injectors? (BB, D, etc)
How much blow by is coming through the CDR?
Instead of throwing assumptions, it'd be good to go through the basics first and narrow it down to whether it's a fuel, air or compression issue. It's always the simple stuff that will bite you in the ***.
Postmaster
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Part of it will be that your old pump is going to be worn, while your injectors aren't... so the pop pressure is likely higher than before, resulting in later timing(as it builds up due to the pumping action) and likely less fuel. At least, that's sort of what I saw when I did the same thing, more or less(new rebuilt injectors, old IP). Advance it, add more fuel and tweak it till it gives you better power.
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