Running Rich
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Senior User
Joined: Mar 2005
Posts: 299
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From: South Texas
Running Rich
Well, my old '87 Ranger with the 2.3 and 5-speed is running rich. I was driving up a hill and the truck started sputtering. When I got home I noticed that puffs of black smoke were occassionally coming out the tailpipe. I don't know if it's related, but I had put a bottle of fuel injector cleaner in the tank that morning. The truck had been driven about 20 miles that day before it started acting up.
I've checked the trouble codes and fuel pressure. There are two codes in KOER test: 32 and 41. My book says code 32 means the computer cannot maintain EGR valve position and code 41 means that the O2 sensor always senses a lean condition.
The fuel pressure test showed something interesting. In KOEO the pressure is 40 PSI. When running the pressure is between 30-32. While at idle, I tried raising the RPMs and noticed a problem. When I first opened the throttle, the engine bogged down and the fuel pressure spiked up to 40 PSI. After a couple seconds it settled back down to 32 and the idle returned to normal.
I also replaced the fuel pressure regulator because I could smell fuel in the vacuum line. This didn't fix the problem. The injectors themselves were replaced about 5 years/30000 miles ago. Also, the EGR system is all pretty new, so that code is frustrating. The problem seems intermittent, the truck runs ok for a couple miles then runs bad for a bit.
I would greatly appreciate any help/suggestions on what might be going on here. My wife's Taurus also died last night, so we are currently without a vehicle.
I've checked the trouble codes and fuel pressure. There are two codes in KOER test: 32 and 41. My book says code 32 means the computer cannot maintain EGR valve position and code 41 means that the O2 sensor always senses a lean condition.
The fuel pressure test showed something interesting. In KOEO the pressure is 40 PSI. When running the pressure is between 30-32. While at idle, I tried raising the RPMs and noticed a problem. When I first opened the throttle, the engine bogged down and the fuel pressure spiked up to 40 PSI. After a couple seconds it settled back down to 32 and the idle returned to normal.
I also replaced the fuel pressure regulator because I could smell fuel in the vacuum line. This didn't fix the problem. The injectors themselves were replaced about 5 years/30000 miles ago. Also, the EGR system is all pretty new, so that code is frustrating. The problem seems intermittent, the truck runs ok for a couple miles then runs bad for a bit.
I would greatly appreciate any help/suggestions on what might be going on here. My wife's Taurus also died last night, so we are currently without a vehicle.
Thread Starter
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Senior User
Joined: Mar 2005
Posts: 299
Likes: 0
From: South Texas
Yes it does have a MAP sensor. Funny you mention that, I performed another KOER test and a code 72 was given in addition to the other ones given previously. According to my manual, code 72 indicates the MAP sensor did not detect sufficient manifold vacuum change during test. Is there any way to test the MAP sensor?
Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
If you have a vacuum pump/gauge and a DVOM than can measure frequency, then you can test the MAP sensor:
http://www.kemparts.com/TechTalk/tt11.asp
http://www.dainst.com/info/sensors/ford_map.txt
http://www.kemparts.com/TechTalk/tt11.asp
http://www.dainst.com/info/sensors/ford_map.txt
