History: Friend gave me a 1990 240SX (auto) with a bad transmission. I fixed the transmission and drove it for about 2 hours and then the timing chain broke. I put a timing chain on it and now I am running way rich.
The car will start and run but its rough. Black smoke comes out the exhaust. I can take pliers and clamp the fuel supply line closed and the car will run perfect for a second and then die (when it runs out of fuel).
I took three vacuum lines under the intake off and I *think* I put them back on correctly but I am not so sure now. The reason I think it may be vacuum related is I pulled the vacuum line off of the Fuel Pressure Regulator and hooked it up to a vacuum gauge and its very very low.
The picture shows 3 metal tubes under the intake and I am wondering which line hooks to where.
If these lines have nothing to do with fuel delivery whats the best way to troubleshoot this issue? These are the only lines I unhooked (atleast intentionally).
Any help would be much appreciated. thanks
Fuel Problem - Running very rich
Re: (-RJ-)
Cap all of them. Change your FPR. Pull your injectors and replace o-rings, use vaseline when you re-install.
If all that fails check your ecu. A friend of mine's was running rich, he took apart the ecu, found a bad connection, no joke fixed it with a paperclip and it stopped running rich.
If all that fails check your ecu. A friend of mine's was running rich, he took apart the ecu, found a bad connection, no joke fixed it with a paperclip and it stopped running rich.
Re: Fuel Problem - Running very rich (heheitme)
hey thanks for the quick replies.
I have done some more troubleshooting and thought I'd provide an update and ask for some more advice.
I hooked up a pressure gauge between the fuel filter and the rail. At idle, I have 40 psi (service manual says this should be 43.4 psi - is 40 "close enough?"). I can take my pliers and close down the hose between the pressure gauge and fuel rail and pressure increases to about 60 psi. Still while holding the fuel line closed the engine will smooth out and run perfect for a second or so until it runs out of fuel. Also I checked the vacuum line running to the FPR and when I squeeze the fuel line and the engines starts running good the vacuum gauge reports about 18 inches of vacuum.
My next plan [pending other suggestions/advice here] is to pull the fuel rail, unhook the electrical connectors from the injectors and with the key "ON" see if anything leaks, then cut the key "OFF" and reconnect power to the injectors and turn the key to "ON" and see if anything leaks.
Modified by heheitme at 5:35 PM 1/2/2010
I have done some more troubleshooting and thought I'd provide an update and ask for some more advice.
I hooked up a pressure gauge between the fuel filter and the rail. At idle, I have 40 psi (service manual says this should be 43.4 psi - is 40 "close enough?"). I can take my pliers and close down the hose between the pressure gauge and fuel rail and pressure increases to about 60 psi. Still while holding the fuel line closed the engine will smooth out and run perfect for a second or so until it runs out of fuel. Also I checked the vacuum line running to the FPR and when I squeeze the fuel line and the engines starts running good the vacuum gauge reports about 18 inches of vacuum.
My next plan [pending other suggestions/advice here] is to pull the fuel rail, unhook the electrical connectors from the injectors and with the key "ON" see if anything leaks, then cut the key "OFF" and reconnect power to the injectors and turn the key to "ON" and see if anything leaks.
Modified by heheitme at 5:35 PM 1/2/2010