Running Like POO!

[JUGGERNAUT]

Re: Running Like POO!

Great, thanks. Ill deffinately check that today. I dont have an aftermarket boost guage yet but I guess theres no time like the present. Ill order one today.

 

[Quickstop [UK]]

Re: Running Like POO!

What rpm is your idle at? FM should tell you.

Got a wideband AFR?

When did you last change the fuel filter/pump?

Got a fuel pressure gauge? What pressure is it set at?

I had a faulty coolant sensor that caused mine to run very rich on start. What temp Is yours indicating? -40 or similar and that won't help. Brand new sensor outta the box as well. You check that in DM as the gauge sensor is totally different.

 

[JUGGERNAUT]

Re: Running Like POO!

Idle is fairly constant around 700 or so. It fluctuates sometimes between 600 and 800.

No wideband.

I did the pump and filter last october.

FP guage on the rail. Its kinda bouncy which Im not too sure about why, but its about 43lbs w/ the vacuum line off.

According to DM coolant temp is fairly constant at 90 C.

 

[Quickstop [UK]]

Re: Running Like POO!

Idle should be 850-875.

Hmmmm.

Have you got a new chip in or anything? If you turn the truck on but don't start it, after the FP primes and you get 50 on the rail, does that stay constant or bleed off fast? Might be worth turning your FP up a bit if you have an adjustable AFPR and see if that cures your idle.

What fuel are you running?

There was a rash of bad fuel pumps recently, at least in the last year or so. It could still be that. Starting to be the likely suspect.

 

[JUGGERNAUT]

Re: Running Like POO!

I bought the walbro pump a year ago, new in the box, from another member. Im not sure how long they had it before I bought it. Ill check in a little bit to see if it leaks down after priming.
I run 93 octane.
Im not sure on the chip, I guess I need to pull the computer down and check.
I have an adjustable FPR I need to find in storage and throw it on. I recently moved from a house with a big 2 car garage with attached workshop to an apartment so all my tools are in storage and any work I wanna try and do is out in the parking lot. Military orders can be a bitch, lol...

 

[Quickstop [UK]]

Re: Running Like POO!

I'm ex Army so I get that! We'll figure this out for you!

When you get the comp test, anything below 150 is suspect.

Let us know

 

[JUGGERNAUT]

Re: Running Like POO!

Thanks for all the help! Yeah, I just hit my 11 year mark in the Marine Corps. Every day I wonder if I got 9 more years left in me, lol. Anyways...

FP with the key on primes up to just under 45 and after 5 minutes is down to just over 35. Im not sure if thats normal or thats too much leak down.
I also tried to check for vacuum leaks like you said and I dont believe there are any. Nothing noticeable anyway.

Im about to get to work on the compression test. Ill post up later. Thanks again...

 

[JUGGERNAUT]

Re: Running Like POO!

I put in a new fuel pump today and that was definately a major part of the problem. My idle is still low but the fuel pressure guage doesnt bounce anymore. I got back lots of power that Ive been missing but something is still not quite right. Tomorrow Im going to hook up the adjustable fpr and wideband and boost guages and run another time with datamaster and post up my results.