Too high or too low - New FPR, bad idle
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Member
Joined: Dec 2002
Posts: 373
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From: Brooklyn, MI
Car: 1991 Camaro RS
Engine: 355
Transmission: 700-R4
Axle/Gears: 4.10
Too high or too low - New FPR, bad idle
The diaphragm on my Mallory 4309 return style adjustable FPR went out last week. I replaced it with a new diaphragm from Summit along with a new pressure gauge to mount to the regulator. I adjusted to 5.5psi and went on my way.
The idle is now choppy and the car almost dies at lights while in gear. So, the question is, am I too high or too low at 5.5psi? Holley Street Avenger 770.
The only change to the car was the new diaphragm. Used to idle perfectly!
The idle is now choppy and the car almost dies at lights while in gear. So, the question is, am I too high or too low at 5.5psi? Holley Street Avenger 770.
The only change to the car was the new diaphragm. Used to idle perfectly!
Thread Starter
Member
Joined: Dec 2002
Posts: 373
Likes: 0
From: Brooklyn, MI
Car: 1991 Camaro RS
Engine: 355
Transmission: 700-R4
Axle/Gears: 4.10
Re: Too high or too low - New FPR, bad idle
Benn running good on 4.5psi.
I pulled the plugs just for fun tonight and they were close to white! Looks like I'm running very lean. Stupid question but does this have anything to do with fuel pressure? My understanding is that if you've got enough pressure to fill the bowls at all times you have enough pressure.
Jetting would be my issue correct?
I pulled the plugs just for fun tonight and they were close to white! Looks like I'm running very lean. Stupid question but does this have anything to do with fuel pressure? My understanding is that if you've got enough pressure to fill the bowls at all times you have enough pressure.
Jetting would be my issue correct?
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