Hi my engine just started running super rich and the check engine light up.??

 

Pull vacuum hose off fuel pressure regulator which is located on the line feeding fuel injectors. If fuel leaks out of vacuum line , replace fuel press regulator internal diaphram is ruptured..

 

checked fuel pressure regulator and no fuel leak.
What should I look at next?
thnaks

 

If it clears up and runs better with higher RPM, look for vacuum leak(s).

 

thanks
phil

 

when running at high revs still blowing rich smoke.
unable to find any vacuum leaks.
Trying to locate OBD 1 reader.

any further advice would be appreciated.

thanks
phil

 

Can you remove a spark plug from each side of the engine and see if both banks are running rich or just one bank. If one bank , you could have a defective o2 sensor stuck lean and the computer is trying to compensate by adding addl fuel.
If both sides are showing rich , I would look at the MAP sensor.

 

not O2 sensor so will need to find MAP .
Will it be near air intake?

thanks
phil

 

Hi again.
Trying to locate the self test outlet on the econoline 1989 f350 7.5L ?
Found the map on passenger side but wiring is so compacted on driver side.
any suggestions?
thanks phil

 

Just wondering, are you sure you don't have an O2 sensor? Being a 1989, you should have a single sensor mounted in the exhaust just in front of the catalytic converter.