ka24de running issue

[gixxerbear]

I've been having some issues with my 92 240sx, the car has been having some maf issues for a while now but has finally crap out. In the past the car would idle rough and misfire but a tap on the maf would fix it, the other day it started idling rough, misfiring, and running super rich. I had a good ground and power at the maf and runs fine with it unplugged so i figured bad maf. After replacing it with a used maf and brand new maf still runs like shit, can find any vacuum leaks and no cel codes. Any idea's as to a possible solution? Thanks in advance.

[c_mancuyas8]

have you checked plugs?

[gixxerbear]

Yes, plugs are fairly new and after playing with the motor a little i have found that if i make a vacuum leak the engine runs a little better which makes sense because of how rich its running. I checked the injectors and they dont seem to be stuck open so when i pull the fuel pump fuse the car runs perfect for about a minuet unit there is no fuel. I put a clamp on the fuel line right after the filter and the car idles better. Could this be a vacuum leak to the fpr or the fpr it's self? I do know that the prior owner installed a bigger fuel pump and i fixed a fuel leak at the filter a few weeks ago.

[slothonaleash]

have you checked your fuel pressure?

[gixxerbear]

I guess thats my next step I dont have a gauge at home so i will have to wait until i go to work tomorrow. I have never had a stock fpr go bad on a car before is the a common 240 issue?

[c_mancuyas8]

I dont think its common but its not impossible.

[gixxerbear]

Ok so after a day of diag I've found that my maf, injectors, o2, plugs, and wires are good. But I'm have an issue getting a good fuel pressure reading. I have 43 psi going in and nothing on the return but when I remove the vacuum line to the for nothing changes so tomorrow I'm going to try a new fpr.

[92sxMike]

So any luck with chaning the fpr? I'm having the same issue to a degree, but I think my issue is an injector, but I will also check the following.