NJFBOA - Home of New Jersey's Camaros and Firebirds - View Single Post - first fire 383 lt1 issues.... idleing mostely

Pampered-Z · 11-23-2009, 03:41 PM

could be the tune or the rockers, sounds like it could be vac or spark related. Stock fuel pressure should be fine.

Also with the car running spray some carb cleaner around the intake, if the idle changes you've found a vac leak.

What size injectors are you running?

What size throttle body?

If you are running a 58Mm or mono then you are going to need to do the air mod, it's very rare that they don't need it. Also, for either of these TBs you need to drop the TPS voltage down to .57-.62 for the car to idle properly.

How big is the cam? big cams normally need a bit higher idle. My cam is 232/236 @ 114LSA and idle is 900rpms, but sounds like it's at 600!

11-23-2009, 03:41 PM	#57
Pampered-Z Sliderule / Moderator Join Date: Oct 2004 Location: Catawissa PA Posts: 2,294 iTrader: (1)	could be the tune or the rockers, sounds like it could be vac or spark related. Stock fuel pressure should be fine. Also with the car running spray some carb cleaner around the intake, if the idle changes you've found a vac leak. What size injectors are you running? What size throttle body? If you are running a 58Mm or mono then you are going to need to do the air mod, it's very rare that they don't need it. Also, for either of these TBs you need to drop the TPS voltage down to .57-.62 for the car to idle properly. How big is the cam? big cams normally need a bit higher idle. My cam is 232/236 @ 114LSA and idle is 900rpms, but sounds like it's at 600! __________________ 93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada 1) Build it 2) Race it 3) Break it 4) Repeat!!!