Stevey629

I have my motor in my car finally, with everything "working". However, either due to blow by because of the new motor, the 2nd stage streetport, or some other reason, I am getting an extremely rough idle or basically anything below 1000 RPM. My car will stall itself out below this if the gas pedal isnt held and the RPM's are sustained as RPM's near that range. My fuel pump has been upgraded, and from what my mech and rebuilder have said, my motor is basically flooding itself as it begins to close in on the idle speeds. I thought I might need to get a new pump and clean my injectors just because of the new amount of air flow. I dont have any sort of electronic management, Im running the stock one, so I wanted to play it safe. But my motor is flooding itself when it tries to idle! what to do, what to do. its spittin flames like 3 foot flames makin dhalsim look like small change.

AresB16A2Turbo

I would suggest getting a standalone, what you get is up to you, Apex'I PowerFC, Haltec, whatever but get your car tuned.

Stevey629

I dont have funds for that right now. I just need to get the car back in my hands. Run with all the stock restrictions, and try to save all the money I can, because this car is costing me way more than I thought it would. So, what I had my mech do is replace the fuel pump with the stock one, only to find out that my stock one isnt working anymore? He says its not pumping even a trickle of fuel. GRR. how is it that Im getting that much fuel down low? Will some piggy back unit like an AFC or maybe even a fuel pressure regulator work for leaning it out down low?

duboisr

Do you have the air pump working ? If that is out ,that alone will make the car idle rich . You maybe can find at least a used PFS PMS to comtrol the mixture . They can be found for several hundred dollers which is cheaper than a new engine . Both running rich or lean can screw an engine . You better plan ahead better or you will end up spending even more . All this is for fun so be carefull, so we all can ride .

Stevey629

PFS or PMS? Sorry, Im not familiar with the acronym. Will an apex'i AFC do the trick to lean it out?

Good call on the air pump check, I didnt think of that. He did say that everything seems to be running just "fine", all the vacuum lines are done correctly, and the EGR valve is fine. Ill ask my mech if the air pump is working. NE thing else that can be inferred as far as the problem goes? I mean, how is it possible that the higher flowing pump is giving it that much extra gas to the point that it floods just at idle? Shouldn't my stock injectors be the bottleneck for how much fuel goes in? I mean, the extra 4-6 psi of pressure cant flow that much to the point where it floods it and shuts the motor down does it?

spurvo

If I'm thinking correctly, wouldn't the porting job also effect the idle mixture at lower rpm? Lower vacuum signal at idle with the higher overlap, right? The lower vacuum signal reduces the amount of air drawn into the engine for a given rpm, but the ECU duty cycle for the injectors hasn't changed, so more fuel is being dumped in with less air (there is no fuel/air metering for idle with stock ECU), and this is compunded with the higher fuel line pressure, wherein more fuel is injected for a given injector cycle.

Right?

seems to me you have to just set the idle higher and live with it until the funds for the standalone ECU come through. Just my $0.02