ScWift92

Hey CL

I Have been driving my sc300 for about a week now after i put another engine and tranny in It. On Start up it idles high 1500RPM Than drops to 400Rpm i Took it to mechanic and we read that the brand new 02's were reading a lean mix.

He than put a propane canister into a hole on my intake and the idle evened out.he said that im having low fuel pressure. What can cause this??

Thanks

ScWift92

Anybody????

Luxor

iTrader: (15)

My car was running lean lately, it was simply due to a piece of rubber that was broken between the intake assembly and the throttle body, so extra un-metered air was getting through the crack. See if that's the case.

ScWift92

I do have an aftermarket intake tho ?

INTIMAZY

iTrader: (5)

Aftermarket generally means 'poorly engineered' at the very least compared to OEM. That would be the first place I would look. Otherwise, I would actually check the fuel pressure at the rail (much better than just guessing) and possibly replace your fuel filter in case it's never been changed. I doubt its the fuel system or filter itself since usually you will run out of fuel at high RPMs or high load, but changing a cheap fuel filter never hurt anyone.

ScWift92

im gonna change the fuel filter and see if that helps also i will check the rail pressure what should it be?

INTIMAZY

iTrader: (5)

Lets just call it 30psi. Its something more like 38psi but anything over 20psi and the ECU will idle it like a champ. I think I've dropped my fuel pressure down to low teens before by accident and it idled fine.

ScWift92

so what Fuel Pressure Regulator Should i Go With?

Dawa

iTrader: (5)

first of all i would have your mechanic measure the actual fuel pressure before buying a regulator.

Luxor

iTrader: (15)

Fuel pressure 38-44 psi.