HELP!!! CAR RUNNING TOO RICH, IS IT THE MAS, VACUUM LINES, OR THE EGR SYSTEM?!?

[b16_destroyer]

My car has been getting like 3 miles to the gallon. I thought it was the fuel pressure regulator so I changed that. While it was running I noticed that I had a rotted out vacuum line coming from the egr valve on the intake manifold to that disc looking vacuum thing located right next to the fuel pressure regulator. It looks like an FMU that you see on turbo kits. KA guys should know this vacuum thing that I am talking about.

Anyway, once I took the broken line off while the car was running (very dumb idea) the car then started running super rich and can barely keep idle while pouring out black carbon smoke from the exhaust. I know the computer should see the changes made and correct everything but its not.Its running too rich to drive.

I have good compression, I already did a full tune up and oil change. What do you guys think is the problem? Could it be a bad EGR valve? Bad MAF sensor? Or do you think the ECU needs to be reset? and if so how do I reset it?

Please, someone respond...this is my daily driver and I can't keep bumming rides. SOMEBODY, HELP!!!!!!!!!!

[SlowBack]

To reset the ecu, go here http://www.240sx.org/faq/index.html . Click the link on the left that says Resetting ECM (or something like that).

I can't think of anything else off the top of my head, but I'll keep thinking.

Good luck,Matt

[b16_destroyer]

Well I tried reseting the ECU, that didn't work. I cleaned out the AIV, that didn't solve it. I am not getting any check engine lights nor any computer error codes.

So, I started unplugging vaccum lines off of the intake piping between the MAF and the TB and the car started running better. Then I unplugged the MAF sensor completely and the car idled like a champ. Only problem is the car won't rev past 2500rpms. Do you guys think that the MAF sensor could be the problem?

[Deadrodent]

if it won't rev past 2500rpms your car's in some sort of safety mode. i'd say your MAF is busted and probably needs to be replaced.