- Joined
- Oct 22, 2014
- Messages
- 181
- Reaction score
- 16
- Points
- 18
- Location
- Albuquerque NM
- Vehicle Year
- 1989
- Make / Model
- Ranger
- Engine Size
- 2.9 L
- Transmission
- Manual
Hey all, my son bought a 90 B2 and has not been able to pass the emissions test. It is failing the idle HC portion of the test. It needs to be under 200 and runs about 375. I have done all the external stuff I can think of: Air charge temp sensor, IAC, O2, MAP, & timing. It actually did its best when the vacuum hose for the cruise was disconnected & idle set with the screw to 1100 rpm. It's obviously getting too much fuel as the exhaust and O2 sensor were covered in soot.
Also to throw into the mix, the truck uses about 1qt of oil in 1000 mi. There is no smoke at the exhaust and no leaks. Do you think this oil is getting sucked into the intake through the PCV and causing the extra HC at idle? The old air charge sensor was covered with an oily film.
Should I have him run it with the PCV disconnected with a filter in the hole? Can you suggest any other troubleshooting ideas?
Thanks.
Also to throw into the mix, the truck uses about 1qt of oil in 1000 mi. There is no smoke at the exhaust and no leaks. Do you think this oil is getting sucked into the intake through the PCV and causing the extra HC at idle? The old air charge sensor was covered with an oily film.
Should I have him run it with the PCV disconnected with a filter in the hole? Can you suggest any other troubleshooting ideas?
Thanks.