sputtering at wot?

[syclone#2659]

this just started tonight after i checked my fuel pressure. i have a stock chip and injectors. my fp is set at 47lbs. and at wot my milivolts read 900-950 range so i know its not to lean. ever after i checked the fp, at wot the truck looses rpm and sputters, until i let off the throttle, if i get into boost and not slam on the gas its fine, what the heck is wrong any ideas? thank you in advance

 

[Timbo]

Re: sputtering at wot?

Bad plug or wire?

 

[syclone#2659]

Re: sputtering at wot?

plugs are new ur5 gap .35 taylor wires new w255 pump. ran fine until i hokked up the fuel pressure gauge, after i diconected it and ran the truck again it stumbles at wot

 

[syclone#2659]

Re: sputtering at wot?

let me rephrase that its more of a chugging at wot. the boost will build fast and then a fast chugging

 

[syclone#2659]

Re: sputtering at wot?

i have datamaster file from tonight and the other day, i just dont know how 2 put them on here for somone to look at.

 

[truckins10]

Re: sputtering at wot?

Sounds like an ignition misfire. See if maybe you move one of the wires off the dis. cap. Try spraying all the ignition wires, plugs, cap and coil with water and go for a drive. See if it gets worse, if it does there is something leaking your spark. Goodluck

 

[HotRudyRod]

Re: sputtering at wot?

I had a couple of gas filters clog and both times it felt very sluggish and chuggie at hi boost or hi rpms. it would fine 'till the injectors couldn't supply enough fuel. Hope this is whats happening on your truck as it is easy and unexpensive to fix. Good luck.

 

[TYTILIDIE]

Re: sputtering at wot?

If I were you I would check your VAC lines. I had one pop off on the MAP and FPR circut and had this problem. Are you getting a CEL? Check your WG/Turbo VAC lines aswell. Do you ahve an aftermarket fuel pressure regulator? Why is it set at 47 if so? Is your motor stock? If it is stock then 47 is way too high.

Mike

 

[Turbo6]

Re: sputtering at wot?

this just started tonight after i checked my fuel pressure. i have a stock chip and injectors. my fp is set at 47lbs. and at wot my milivolts read 900-950 range so i know its not to lean. ever after i checked the fp, at wot the truck looses rpm and sputters, until i let off the throttle, if i get into boost and not slam on the gas its fine, what the heck is wrong any ideas? thank you in advance

How much boost are you running?

 

[syclone#2659]

Re: sputtering at wot?

i am running stock boost, and what should i run my fp at? for stock. 42?lbs .and i fixed the prob also it was # 1 cylinder plug wire barely on the plug.

 

[Timbo]

Re: sputtering at wot?

and i fixed the prob also it was # 1 cylinder plug wire barely on the plug.

:werd: I had the exact same problem when my #1 plug wire got burned on the header.

 

[InvisiBill]

Re: sputtering at wot?

http://syclone.invisibill.net/dm/syclone#2659/

 

[BLACK92TY]

Re: sputtering at wot?

Change your igniton coil. It's cheap and it's easy. I had the same problem and I can't believe I did everything EXCEPT change the igniton coil.