Loss of power/higher EG temps

[JGarrett]

I just returned from a 1000 mile trip, pulling a 20 foot enclosed trailer and car. I had a loss of speed on climbing hills and higher EG temps, than normal. The truck also seemed to run a little ruff at times. There were no codes in the computer when I got home and after I filled up with fuel it seems to run better for a while.



I am thinking that maybe that the lift pump is going. Is there a pump in the fuel tank and also the lift pump on the fuel filter, or does the lift pump on the fuel filter pull the fuel from the tank.



2004. 5 3500 68,000 miles SRW 4/2 quad cab auto trans edge box.

 

[RustyJC]

Loss of power and higher EGTs (especially if accompanied by more than usual amounts of black smoke) could also indicate a boost leak. I'd check the flexible "hose" connections and the intercooler end tanks as a first step.



Rusty

 

[JGarrett]

Thanks for that I will check. There has'nt been any black smoke. Alsi is there a pump in the tank or just the lift pump.

 

[steved]

The lift pump will be in one location, or the other... not both.



04. 5 should be on the filter bowl...

 

[JGarrett]

Thanks for the info about the pump, hope to get the new one tomorrow.

 

[AH64ID]

I wouldn't spend any money on a stock pump if its on the filter bowl. Look into a better stand alone system that is closer to the tank.

A failing fuel pump will cause loss of power with lower EGT's, not higher EGT's. Your issues sound more like a boost leak. It's an 04. 5 so it should have a metal IC, but double check.

Rough running could be a injector as well.

Try running a good injector cleaner thru it and be sure to check for boost leaks.

Boost leaks don't always make smoke, when my IC failed I got high EGT's and low boost, with slightly less power and zero smoke.

 

[Prairie Dog]

First thing I would do is replace the fuel filter.

 

[AH64ID]

First thing I would do is replace the fuel filter.

While a good stating point a lack of fuel flow wont lead to low power/high EGT's. That's a lack of air.



Air filter and boost leaks are the most common.

 

[HBarlow]

JGarrett,

Have you pulled that trailer and load before? You didn't offer any information about your towing experience with that truck.

If that is the first time you've towed that load in the hills the higher egts and loss of performance might be completely normal.

 

[JGarrett]

I looked at the IC and the connections to the turbo and I did'nt find any leaks in the hoses that I could see. Some one said that you can get more smoke with a leak but I haven't seen any. The last time I towed I had my slide in camper that weighs 4000lbs and the car on a tow dolly and the EG's were lower than with just the trailer and car. I am going to put a FASS pump back by the fuel tank. If that does'nt fix the problem, at least I won't have the lift pump problem to worry about. I will change the fuel filter and try some injector cleaner also.

 

[AH64ID]

You may have to pressure test the intake system. My bad IC didn't leak until about 30 psi was made.

Do you have a boost gauge? How does the boost look?

What kind of EGT's were you seeing?

What shape is the air filter in?

I don't beleive it has anything to do with a fuel delivery issue, that won't make EGT's high. No fuel means no fire means no EGT's.

 

[JGarrett]

The boost gauge looked normal during the towing, max boost was about 25 to 28 or less. When I was towing about 2 weeks ago with the slide-in tow dolly and car the EG's were up to about 800 to 900 max. Last year towing the slide-in and trailer and car climbing the hills on route 77 in virginia I only got 900 EG's, this trip with just the trailer and car I was 1100.



If there is a leak in the IC how do you test it if you can't see anything obvious.

 

[AH64ID]

There doesn't seem to be a leak, 32 is peak and will settle at 28-32 based on load.

Are you monitoring EGT's pre or post turbo? What kind of gauges?

Your EGT's look to be post turbo as they are quite low for a 04. 5 motor.

 

[JGarrett]

I have the probe after the turbo in the down tube, Auto meter gauges.

 

[AH64ID]

1100° post is about as hot as it should run on an 04. 5. You would be much better off to run a pre-turbo pyro, the readings are much more accurate.

There really doesn't seem to be much, if anything, wrong with your EGT's. Probably something we should have asked at first is what the boost/EGT's were. I also should have asked what edge box does it have, and what settings are it on?

Do a WOT run in OD and see what you get for boost/EGT's.

The 04. 5-07 motor will run up to 1450° in the manifold when towing pretty easily, minus the average 300° drop for a post-turbo probe and your normal.

When I had a boost leak my boost would go from 30 to 26 FAST and EGT's from 1000° to 1350° FASTER and with the tuning I was running breaking 1250° was difficult.

 

[JGarrett]

I have an Edge EZ Module that I was running on step two, they say not to tow on three.



I have noticed that the last few months that the milage has seemed lower than normal, and the EG's seemed higher than they used to be(not allot 100 or so just driving around empty). I don't drive the truck allot, once a week or so, but the way it acted on this trip wasn't normal.

 

[JGarrett]

I have an Edge EZ Module, I tow on step two they say not to tow on three.



I don't drive the truck all that much about once a week, I have noticed the milage has been lower than in the past and the EG's are about 100 higher just driving around empty, than they used to be.

 

[AH64ID]

The Edge EZ is a pressure box, which is the quickest way to kill a set of injectors, especially if you don't have added filtration.

Check your oil to see if your making any.

It would be nice to see what boost you run WOT thou, just to see. IIRC the EZ is a boost fooler as well.

 

[JGarrett]

I will check it out, and post the results, thanks for all the advise.

 

[JGarrett]

I have been driving around empty, with the Edge box set on 3. The truck has been running great, Eg's have been normal. I jumped on it from a stop light, and pushed it up to 70mph in about a quarter of a mile, the Eg went up to about 1000 degree's and went right back to 500 degree's as soon as I let of the throttle. The boost went up to 30 and then went down as the truck shifted. For now I will let everything be and will be towing in a couple of weeks, will see what happens then.