2004 1.8l. It started on Saturday morning running very rich, black smoke out of the exhaust. Looked at it yesterday. Checked the air filter and put a new one in it. Still running rich but not as bad. Determined that it was in 2500 rpm limp home mode. Checked and cleaned the maf sensor, sensor wire didn't look too bad. can't determine why it's running rich. Fuel pressure is at 52 psi. All 4 spark plugs
were sooted, cleaned them. They are only 2 months old. Unplugging each injector made it miss so it seems they are ok. I replaced the front o2 sensor, didn't think that was the problem and it wasn't. With it not in limp home mode the front o2 sensor is reading around .250 volts. The stft was at 0. The maf sensor is reading around 3gal/min on all with my scan tool. I have a maf sensor ordered, not confident that is it but I have to try something. The car has 252000mi on it and I have had it since 138000 and have only put in spark plugs. This car doesn't have an egr valve either. Ideas?
JA: Have you located all of the vehicle's oxygen sensors? Are the wires leading to and from each intact and in good shape?
Customer: Yes they look good.
JA: Are you hoping to fix this yourself? What have you tried so far?
JA: Anything else you think the mechanic should know?
Customer: I am an ase auto certified, ase master truck certified and master evt fire apparatus certified tech.