possible injector sticking, need help

smacbay_gt · Jan 7, 2010

ok i am having some problems with my car, i recently had the car timed and it is 10degrees advanced i think, it runs smooth and drives fine until i press the pedal quickly, as long as i ease on it it runs fine, but when i punch it, the mtor lags, and it puffs out black smoke, i know it is running rich and my mechanic said that it was an injector sticking. i am planing on upgrading to 24lb injectors as soon as they get here, i already have a 75mm MAF and TB, does this sound like my injectors or is there maybe another problem. thanks

dan

Paul · Jan 7, 2010

Unlikely. Injector failure is extraordinarily uncommon. How do you know it's running rich? Do you need 24 lb injectors? What is your motor combo?

Has your fuel pump ever been changed?

smacbay_gt · Jan 9, 2010

the motor is stock 5.0, i have put a msd coil and underdrive pulleys on it with a new h pipe and loudmouth exhaust. i know it is running rich cause when it revs hard it puffs out black smoke and it smells like fuel, yes my fuel pump and filter have been changed recently, the pump was changed before i bought the car, i think the previous owner put in a pump that pumps too much cause i can always hear the pump running or whining. i am upgrading to 24lb injectors cause i have the maf and tb that are 75 mm and calibrated for those injectors and i have an E303 cam with roller rockers and lifters and chromemoly pushrods, i havent put them in the car yet, i just wanted to figure out the overloading before i did the cam and injector swap.any info would help

smacbay_gt · Jan 9, 2010

oh just for a little more info, i am also gonna build a 347 stroker fo it also, i ordered the block from summit with trickflow heads and trickflow upper and lower plenum, i just wanna make sure that when i do the engine swap i will be able to work all the kinks out first, this is my first mustang i have ever built and also the first fuel injection motor i have ever built.i am wanting a street strip car

2002BLGT · Jan 9, 2010

smacbay_gt said:
ok i am having some problems with my car, i recently had the car timed and it is 10degrees advanced i think, it runs smooth and drives fine until i press the pedal quickly, as long as i ease on it it runs fine, but when i punch it, the mtor lags, and it puffs out black smoke, i know it is running rich and my mechanic said that it was an injector sticking. i am planing on upgrading to 24lb injectors as soon as they get here, i already have a 75mm MAF and TB, does this sound like my injectors or is there maybe another problem. thanks

dan

What 75mm MAF do you have on it

QIKGTS · Jan 9, 2010

Sounds more like a bad regulator to me... Has the fuel pressure been checked and verified to be correct?

94Snake · Jan 9, 2010

QIKGTS said:
Sounds more like a bad regulator to me... Has the fuel pressure been checked and verified to be correct?

+1

i'd check the fuel pressure.....is it the stock unit or an adjustable?

smacbay_gt · Jan 10, 2010

the MAF i have is from a buddy's cobra, the regulator is still stock as far as i know

QIKGTS · Jan 10, 2010

smacbay_gt said:
the MAF i have is from a buddy's cobra, the regulator is still stock as far as i know

QIKGTS said:
Sounds more like a bad regulator to me... Has the fuel pressure been checked and verified to be correct?

And the actual fuel pressure is?????

smacbay_gt · Jan 17, 2010

just replaced my regulator and the problem still exists, it acts like when i give it gas the fuel lags, i am gonna try the pump and see if that might be the problem