[30 sick]

Hi, I have an 86 hatch with a 93 cobra motor in it its a 306 and its supercharged. Recently the feul pump went out in the car and it had a stock pump in it and it ran kinda choppy on all motor but was ok in boost. It had a stock feul pressure regulator as well. The car has 30lb injectors and a 75 mm mass air sensor matched to the injectors. I replaced the pump with a walbro 155 pump. After replacing the pump the car wanted to flood out even with the stock regulator. When it is cold it wont hardly catch an idle until it gets almost to temp. It also cuts out when you accelerate quickly. Once it gets up to temp it runs fine and seems good until you shut it off and try to start it back up. It floods itself out and just spins over and smokes white out of the oil breather and the exhaust and smeels like raw feul. The oil smells like straight up gas as well. (And only has 1000 miles on it.) When you let the car sit for a while after flooding it will start and run and run choppy and spit at the throttlebody until its warm. If you shut if off it wont start up at all. I put on a holley regulator 35-65 psi. I set the regulator around 39 and it started up and ran good until it cut it off. It flooded itself, It was flooding out with the stock regulator but i figured if i put a 155 pump in it it shouldnt be flooding anyway and the regulator needs to be replaced anyway being its a boosted car and has bigger injectors . The car has an a9l ecm in it and has not been tuned. My over all question is what is making a feul injected 400 rwhp car flood out with a 155 pump ,And what else do i check? ive tried retarted the timing and advancing , i noticed it ran better advanced but still wont start back up. Ive tried all i know to do with the car. The motor only has 9000 miles on it and has ran fine on a stock feul pump.It hasnt been ran at boost that many times. Its leading me to think the rings are getting washed out or the ecm just needs to be tuned b/c it doesnt know when to tell the injectors to quit pulsing with the bigger pump. keep in mind last week with a stock pump and regulator it ran correctly with an air to feul ratio of 14.71 to 1. I hope that kinda explains what its doing.

[spdjnky_42]

Definetly going to need a custom tune w/ that setup. Also, do you have fuel in your oil? Are you sure you didnt put a 255lph fuel pump in? If you didnt then you should have w/ 400 rwhp. Could have a stuck injector.

[30 sick]

i was thinkin on a tune most definitely. Its a 155 pump unless they put the wrong pump in the box at summit racing. There very well might be a stuck injector, How long should they pulse while priming before you start it up? The thing is that i put the 155 pump in trying not to have it tuned just yet and that it was going to be the right amound of feul. Once it is tuned it probably will need a 255 pump though. I belive the a9l ecm only allows 19 or 24 lb's on the rail with the stock tune?

[EagleAutosports]

You were running at 14.7:1 air/fuel ratio? That is WAY too lean, for a naturally aspirated engine you need around 13-13.2:1 and a boosted engine needs 11.5-12.0:1 ratio, get that thing tuned for sure.

[9000rpm5.8]

narrow band oxygen sensors only read 14.7, anythng else and it will only tell you if its rich or lean. Did you replace the O2 sensor? also have your injectors put on a bench and test for leaks. (By the way.....an ecm has no way of knowing waht flow rate the injector is. Someone mentioned the ecm wont run 30 lbs injectors)

[30 sick]

yes, 14.7 and yes stock narrow band o2 sensors. once the ecm is tuned the o2 sensors should not matter though. The car still has to pass emissions for another 2 years. I checked today and found out the ground to the ecm is loose and that the injectors are pulsing when the key is in the on position. They shouldn't pulse unless the switch is in the start position or when its running ofcoarse. This all may be triggered by that ground being loose or the ecm is fried. The only way i know i could have fried it is when the old feul pump went out and i kept turning it over. I dont have a way to really test anything else right now b/c the intake is off of the car and im putting on a new lower gt 40 b/c i broke the right rear feul rail retaining bolt off in my old one and my 3 and 4 injectors wouldnt seat without it.