p1093 code

[Fast Track Performance]

I just got my truck running after being wrecked in the front and it idles and cruises around pretty good, but at WOT feels slow to me. The dash does not show a code but I hooked my scanner up to it and it shows the desired rail pressure to be at 23k at wot and my actual is at around 10k. At idle and part throttle the values are fairly close untill you go WOT and the actual rail pressure starts dropping. Assuming this was a problem I changed the fuel filter and nothing changed. A friend recommended a balance test on the injectors and the worst one was -2 at idle and -2.9 in gear at idle.

I know quite a bit about cars, but nothing about diesels.

Since it is not getting the fuel pressure it is commanding I am assuming:

1. there is a restriction pre pump
2. the mechanical pump is weak(called cp3?)
3. there is something wrong with the regulator


There is no lift pump factory correct?

The only mod to the truck is a k and n air filter, and im not sure if it has a programmer from the previous owner, but seems unlikely. The exhaust at wot is just barely dark if you are looking in the passenger mirror for it. It is a 02 Silverado 2500 hd with 200k miles on it.

 

[RKTMech]

There are a lot of good threads here on diagnosing low fuel pressure, do some reading and you'll get far, there a dozen things that can cause a 1093. First and for most truck info helps a lot around here :thumb: year and engine family!

 

[Fast Track Performance]

There are a lot of good threads here on diagnosing low fuel pressure, do some reading and you'll get far, there a dozen things that can cause a 1093. First and for most truck info helps a lot around here :thumb: year and engine family!

Yeah I am reading through all the threads about this but the suggestions are all over the place. One guy will say injector, and next guy says do the bottle test. I updated the original post with truck info.

 

[wdino73]

I don't know the extent of your accident but could you've a crimped fuel line somewhere? I assume it ran fine before you wreck..

 

[Fast Track Performance]

I don't know the extent of your accident but could you've a crimped fuel line somewhere? I assume it ran fine before you wreck..

They did replace the frame under the truck. The lines are brand new from front to back on the truck. Just wanted to make sure I wasnt overlooking anything simple and get some ideas from people who know better then me.

 

[THEFERMANATOR]

First things first, get a vacuum guage hooked up at the test port on the engine and see what you've got. That will tell you if it is a crimped line or restriction to the engine. It could also be a collapsed fuel line at the engine causing it, a CP3 that decided to go south, injectors, FPR, and many other things. Gotta start testing and go from there.

 

[Fast Track Performance]

First things first, get a vacuum guage hooked up at the test port on the engine and see what you've got. That will tell you if it is a crimped line or restriction to the engine. It could also be a collapsed fuel line at the engine causing it, a CP3 that decided to go south, injectors, FPR, and many other things. Gotta start testing and go from there.

If it were injectors it would probably show symptoms at idle and cruise right?

Where is this test port you talk about?

 

[Fast Track Performance]

I pulled the electrical connector to the regulator and it only made about 15k right away, and 20k when I revved it up alittle. I read it was supposed to max out the pump at 24k+?

 

[THEFERMANATOR]

If it were injectors it would probably show symptoms at idle and cruise right?

Where is this test port you talk about?

Nozzles will show up at idle, but the bleed port won't. The test port is located on the front of the engine by the alternator. It will have a black plastic cap on it and uses a large quick connect fitting to hook up to it. Since you say the fuel lines were replaced, it could simply be trash in the fuel system somewhere from when it was opened up.

 

[madmatt]

Hey did you get this fixed?? if not give me a call and I can help ya out. still have my number??

 

[Fast Track Performance]

Havent really looked at it anymore, it is fine cruising around. I'll give you a shout when I have time to look into it.

 

[madmatt]

for sure,, I have the gauge you'll need to check vacuum and a clear hose that goes in the supply to see if it's drawing air.