Very rough idle, Wb lean, and more "datamaster log inside"

[pearl91chevy]

Re: Very rough idle, Wb lean, and more "datamaster log inside"

18psi of boost at most, base fp is at 42psi

Forgot to add, at idle if I snap the throttle quick, there is a slight hesitation before it revs

 

[0966Sy]

Very rough idle, Wb lean, and more "datamaster log inside"

18psi of boost at most, base fp is at 42psi

Forgot to add, at idle if I snap the throttle quick, there is a slight hesitation before it revs

Ok, bump up the fuel pressure to 45psi base to see if it helps. What size injectors? What gap are your spark plugs? Does it only break up at higher RPM/boost?

Triple check your distributer bolt is tight and timing set on 0* with tan wire disconnected.

@ 45psi base you should have 63psi at wot @ 18psi

 

[e95 Ty]

Re: Very rough idle, Wb lean, and more "datamaster log inside"

Starting to wonder if your fuel pump is weak or starting to take a dump....You need to hook a fuel press gauge up to the fuel rail and drive around till you can get the truck to act up again. When it runs like crap see if your fuel press drops or doesn't increase under boost.....

Also, X2 on what Jimmy said. You should not smell any fuel in your regulator vacuum line.....

 

[pearl91chevy]

Re: Very rough idle, Wb lean, and more "datamaster log inside"

Ok, bump up the fuel pressure to 45psi base to see if it helps. What size injectors? What gap are your spark plugs? Does it only break up at higher RPM/boost?

Triple check your distributer bolt is tight and timing set on 0* with tan wire disconnected.

@ 45psi base you should have 63psi at wot @ 18psi

I'll bump it up today then. 60lbs injectors NGk ur6 plugs gapped at .028
And yea it seems to only break up when in boost

I checked distributor bolt last night and it is tight but I will still check timing

 

[pearl91chevy]

Re: Very rough idle, Wb lean, and more "datamaster log inside"

Starting to wonder if your fuel pump is weak or starting to take a dump....You need to hook a fuel press gauge up to the fuel rail and drive around till you can get the truck to act up again. When it runs like crap see if your fuel press drops or doesn't increase under boost.....

Also, X2 on what Jimmy said. You should not smell any fuel in your regulator vacuum line.....

I did hook up the gauge and drive it, even with the truck acting up the gauge didn't drop.. I only boosted up to 5psi before I let off because it was picking up so much knock..

Btw I didn't touch anything on the motor but I did put the computer/wb box back up underneith the dash, when the night I took it out it was loose and hanging.. I'm curious if something in the wb box or just a wire is making the truck act up, so I'll be checking that

 

[bundie]

Re: Very rough idle, Wb lean, and more "datamaster log inside"

I did hook up the gauge and drive it, even with the truck acting up the gauge didn't drop.. I only boosted up to 5psi before I let off because it was picking up so much knock..

Btw I didn't touch anything on the motor but I did put the computer/wb box back up underneith the dash, when the night I took it out it was loose and hanging.. I'm curious if something in the wb box or just a wire is making the truck act up, so I'll be checking that

might be a loosse connection at the plx or ecm.....

 

[pearl91chevy]

Re: Very rough idle, Wb lean, and more "datamaster log inside"

Dug threw everything ECM and wideband related. I wiggled a few wires and seen the wb gauge was shutting off and on. I then remember I have the wideband power wire connected to the ECM fuse. Later the night it ran good I had to reset the light for checking timing, I pulled that fuse.. Well I must have not had a good connection on that wb wire. I redid it and just went and drove it.. Back to running good again for now.. I also set the wot af mix to be at 11.3 to start with. She's back to no knock and running solid so we'll see.. Gonna go cruise with her in a bit

 

[bundie]

I have the power conection at the spare ign slot on top off the fusebox glad iTS running good again


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[pearl91chevy]

Re: Very rough idle, Wb lean, and more "datamaster log inside"

ok ill get mine connected to that location when i get back.. going to take her out now

 

[berzerker]

Re: Very rough idle, Wb lean, and more "datamaster log inside"

truck still have catylitic convertor ?

 

[pearl91chevy]

Re: Very rough idle, Wb lean, and more "datamaster log inside"

Just drove the truck for a good 2 hours.. Not a single problem, truck was running extremely strong with the 30degress outside. So the power wire was the last issue. Thanks again guys.. Back to my old quest for 11s thread

 

[Richie Rich]

Re: Very rough idle, Wb lean, and more "datamaster log inside"

So it was the WB not getting proper power?

 

[pearl91chevy]

Re: Very rough idle, Wb lean, and more "datamaster log inside"

So it was the WB not getting proper power?

I think in this situation yes, it was a loose wire.. I'm having similar issues now but it's not the wb wiring