Bajajay98

have a 540 whipplecharged BBC. Runs absolutly great, for some reason this year it started stalling when you would come off plane. Pulling back on throttle easy, around 800-1300 rpm that's when it dies. It gives alittle spit or pop, like a misfire out the intake. Not sure if it's a fuel pressure issue, IAC , throttle blades not open enough??? Spark arrester blades are clean, IAC filter is clean. I have 28-30psi fuel pressure at idle and WOT. Aeromotive 1000 pump. After a stall it does re start right back up, no issues. Just not a good feeling when it stalls off plane. Any suggestions would be greatful, I'll be calling my engine builder on the weekend.



Thanks jason-

Swamplizard

Check fuel filters if it is a new simptom
.

jeff32

Same thought here!

Bajajay98

Why would you say it's a fuel filter issue if I have solid fuel pressure ?

TooLateVTEC

iTrader: (1)

What EFI setup is on it?

That FP seems low

Bajajay98

Should be the set up that came with either the factory 525 merc or Whipples program. I swear the FP was suppose to be 58-60 psi with a whipple set up

TooLateVTEC

iTrader: (1)

I dont know of an EFI setup off hand that would run with 30 psi. Most are 58-60 like you said.

Checking/cleaing/replacing the filters is a good place to start for sure, especially since it didnt do this before.

Tinkerer

Sounds like a lean pop to me. POP through the intake at any RPM usually means lean spot.

SB

iTrader: (1)

So, don't run it again until you get word on what fuel psi is supposed to be. Lean is mean, puts a torch on the pistons and likes to rattle things.

Your builder only works on week-ends ?

Turbojack

Bad IAC