i need help with my new ka24e engine!!!!

[eliminator024]

i have a 1990 Nissan 240sx
so i blew up my old ka24e engine and put in a new one and it wont run right

so i had a mechanic look at my car he ran a fuel pressure test it was too high and some electrical test......

so what it came down to is that my car has too much fuel going to it runs rich the pressure is too high what could it be?

if we pull wires from the fuel ejectors or the spark plugs the car still runs the same no change?

he dont know whats wrong with it so im stuck now.... so its running rich black smoke out of the exhaust...

if we cut the pressure down by squeezing the fuel line it runs right. any one think they know any thing it might be? any one ever have a similar problem? let me know please thanks.

it is a different engine and the last one did not do this.

[zachattack_5491]

Get a new fuel pressure regulator. You took it to a mechanic and he didn't think of that?

[eliminator024]

see i told him that, he said he is sure that is not the problem im going to go buy a new fpr and ill let you know thanks for the help

[zachattack_5491]

No problem. Just head over to the classified section and maybe you can find a partout and get one for like $5

[eliminator024]

it wasn't the fpr so what else could it be?

[1KleenS13]

Kinked return line

[eliminator024]

how do i test to know if it is kinked? that is the line going into the fpr right that goes back into the fuel tank, the line next to my fuel filter? just want to make sure im right......

[eliminator024]

well if i was right on my last post i took the line off of what i believe return line nothing changed so i don't think it is clogged or kinked....could it be my cam timing is off to make it run this way?

[eliminator024]

any one!!???? this is my daily driver and it has not been running since august
borrowing my moms jeep to get places is no fun....

[Justinians_2:40]

If it's too much fuel pressure, you've either got a bad fpr, clogged/kinked return line, or the vacuum line to the fpr is not connected. The fuel system is a relatively simple system, the only other possible issue is that your fuel pump is way to powerful and is overpowering your fpr, which is doubtful.

As far as cam timing, it is not possible for cam timing to effect fuel pressure. The only reason you would get black smoke from cam timing being off is if your exhaust valve is opening waaayyyy too soon and not allowing a fuel burn.

I say, check your fpr again, make sure the vacuum hose is connected and not damaged, and I would check the return line again too. Just to keep it simple, get some EFI hose, enough to go from your engine bay to the gas filler, take the return line off and connect this new hose to the fpr, and just run that back into the tank. If you still have the same problem, you've either got another bad fpr, or someone before you put some bad a** high volume pump in there.

[eliminator024]

thanks it was wire on the maf went bad