first fire 383 lt1 issues.... idleing mostely

[LTb1ow]

Whats the LSA on the cam?

[sweetbmxrider]

sorry buddy

OPEN LOOP - this is the mode your ECU is in until the coolant temperature and a couple other sensors get to operating values. This is also true when you are at WOT or when throwing codes/ CEL's

CLOSED LOOP - the ecu uses information primarily from the Oxygen Sensor and adjusts fuel delivery and timing to achieve minimum emmisions, better gas mileage and power.

i am certain you were still in open loop but let me know when you are working on it and i'll try getting over with a scanner again.

[BigAls87Z28]

I got free time Tuesday. I think Ill be playing with the 72 on Tuesday to see if I can get it running.

Im not sure on LT1 cars, but does it take 30 sec or so for it to enter closed loop? Arent they heated, and therefor dont need to stay in open loop for that long?

[HeadlessNorseman]

My took about 5-10 mins before it realized i cut one of the o2 sensors wires. You can use the "fix the autozone ford pickup" trick that Al knows about haha... start unplugging stuff and see if you can find a problem that way. Like if you unplug one o2 and it runs worse, but unplug the other and it stays the same, then you have a lead to go on...etc. Also are you sure about the fuel pressure/fuel injectors/harness? FP leak down test or just see what the static pressure is?

[S.J.SLEEPER]

mass air? or speed density?
if its speed density it will run like $%(* if not @ all if map is unplugged/bad

ect will cause it to dump fuel if bad

what plugs you runnin? if it ran too rich on start up/dumpin fuel and your runnin ngk's. then the ngk's are done !!! ngk's don't take well to raw fuel, soon as there wet there fouled and normally will not clean out.

i used to own a motorcyle shop & all i used was ngk's. once they were fouled when tuning a bike , thrown out and new one installed due to their short "wet" life....

[ib4200]

i remeber him saying somewhere he doesnt have ngk's but im most likely wrong, i wanna say he had autolite for some reason?

[Pampered-Z]

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!

[LTb1ow]

236/242 580intake 541exhaust 110lsa

[sweetbmxrider]

tuner was supposed to set it at 900, 42lbs, and 58mm tb.

i was thinkin bout checkin for vac leak too but it doesn't sound like a big one, like you don't hear that sucking sound.

[transmaro93]

yea i will check for vac leak when time comes... i am running ngk iridiums... i guess ill pull them to see what they look like... its raining today so im not going out there... hey pampered when you say the "air mod" is this what featherburner suggested also by drilling the IAC port out and blocking the back off...? im also going to pull the pcm out to make sure there is no bent pins or anything when it connects... im still going to drain the gas also...

[JL8Jeff]

Do you have the stock TB to try instead of the 58mm? Which 58 mm do you have?

[transmaro93]

summit brand....

[Pampered-Z]

Yes that's the mod to the TB.