Engine/Transmission (1998.5 - 2002) Is this my injection pump gone?

[CTaylor]

Is this my injection pump gone? Update

My 99 in my sig all at once lost power after sitting for a week and didnt want to rev past 1400 in gear and would only hit about 2000 in park. I checked fuel pressure and it read 8. 5 at idle and 6. 5 at 2000 rpm where the truck would roll coal and sputter in park



I installed a new lift pump today(yes a stock one as I have a P pump swap planned in the future) and it now has 19. 5 psi at idle and drops to 17 psi at 2000-2200 where it runs like crap and smokes out the garage.



Is my injection pump probably toast due the last lift pump being weak? If so why does it smoke so much at high rpm where it starts to miss?



Truck has 182k and had a reman vp44 on it when I got it

 

[JLandry]

Symptoms like that could be caused a lot of things. Of the top of my head... a bad VP44, restricted intake or air filter, bad injector(s), bad fuel, restricted fuel filter, lift pump sucking air on the supply side, faulty MAP sensor, faulty IAT sensor, a turbo problem, etc.

What color is the smoke?

Have you checked for trouble codes using a code scanner?

Where are you measuring the fuel pressure? Could the fuel filter be dirty?

Did you check the air filter and intake for restrictions?

By chance did this happen right after filling up the tank?

Regards,

John L.

 

[CTaylor]

Thanks for the reply



The air and fuel filter are new. The truck started doing it all of a sudden after sitting a week. I havent fueled recently in fact im down to last 1/8th of a tank or so now (low fuel is on).



I measured the fuel pressure on the plug that is below and to the right of the 2nd one which I belive would be the pre filter pressure? I havent scanned for codes I dont have a scanner and im unsure if I could drive it to autozone to have it checked.



The smoke color the best I can tell from it being in the garage and choking me out rather fast is a light black or maybe grey, it for sure burns the eyes! It never smoked like that when it was running normal

 

[JLandry]

I havent fueled recently in fact im down to last 1/8th of a tank or so now (low fuel is on).

Aha!



Get a 5 gallon fuel container of diesel and put that in the tank. That'll rule out the possibility the lift pump is drawing in foam from the bottom of the tank.



Please report back on how that went and we'll take it from there.



Good luck,



John L.

 

[SnoKing]

Did you check for an animal nest in the air box? SNOKING

 

[Jerryy]

After 274,604 miles (mostly towing), my trusty 99 finally died along I-40 while towing my travel trailer. Everything was running fine (had just pulled a grade), was on flat ground, the check engine light came on, engine died and coasted. I called a road service outfit, made sure they brought a scanner, and the codes were fuel injector pump. As many have indicated, no hints, running fine prior, then-----. I was towed to Northern AZ Diesel in Flagstaff, AZ where they again diagnosed injector pump failure. After installing a rebuilt pump, they determined that the lift pump was toast too and replaced it. I would assume the lift pump failure caused the injector pump failure. Don't know if this helps in your situation.

 

[CTaylor]

Aha!



Get a 5 gallon fuel container of diesel and put that in the tank. That'll rule out the possibility the lift pump is drawing in foam from the bottom of the tank.



Please report back on how that went and we'll take it from there.



Good luck,



John L.

Thanks John

I poured about 18 gallons of fuel in it and the low fuel light stayed on and the fuel guage didnt move? The truck still does its thing smokes blackish smoke and misses at around 2000rpm. I put in gear and kinda tried to jump on it and it acts like a slug hitting a rev limiter?

 

[CTaylor]

update to above post

Ok I finally pulled the 99 out of the garage and let it run about 5 mins in the driveway, the low fuel light finally went out and the fuel gauge went to about 3/4 full mark finally. I took off down the street and it had no power what so ever. I stopped at a stop sign put it back in park and gave it a couple of quick revs and lo and behold it actually finally went above 2000 rpm and didnt miss. I put it back in gear went to the corner store a mile or so away shut it off and went in to get some beers came out and for the 1st time it was hard to start (3 or 4 revolutions before it fired) I made it back home no trouble at all but I for sure think the pump is whacked

 

[JLandry]

... the low fuel light finally went out and the fuel gauge went to about 3/4 full mark finally.

Among the other problems yo're dealing with, it sounds like you also need to replace the fuel level sending unit. I had to replace the one in my truck a few years ago when I noticed my loft pump was sucking air (fuel pressure gauge fluctuating) and the fuel gauge still showed a 1/4 tank. Replacing the sending unit will also give you a chance to inspect the inside of the fuel tank for debris and the fuel tank module for problems.

... I for sure think the pump is whacked.

It's sure seems like it could be. You've definitely eliminated fuel starvation.

I was going to suggest you consider replacing the MAP sensor, but if it were the culprit, you'd have low power but wouldn't have trouble revving the engine over 2000 rpm. That alone would seem to point back to the VP44.

Good luck,

John L.

 

[CTaylor]

Among the other problems yo're dealing with, it sounds like you also need to replace the fuel level sending unit. I had to replace the one in my truck a few years ago when I noticed my loft pump was sucking air (fuel pressure gauge fluctuating) and the fuel gauge still showed a 1/4 tank. Replacing the sending unit will also give you a chance to inspect the inside of the fuel tank for debris and the fuel tank module for problems.



It's sure seems like it could be. You've definitely eliminated fuel starvation.



I was going to suggest you consider replacing the MAP sensor, but if it were the culprit, you'd have low power but wouldn't have trouble revving the engine over 2000 rpm. That alone would seem to point back to the VP44.



Good luck,



John L.

Thanks John for the help! It came back to life with all of it previous power but now that it has began the hard start issue I remember my friends 01 doing that. He started it with a gas soaked rag for about a week then it finally let go all the way