Self Test diagnosis question(s)
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Post Fiend
Joined: Apr 2004
Posts: 6,473
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From: Lafayette, IN
Self Test diagnosis question(s)
93 F250 351 (see sig). I did the procedures (KOEO and KOER) outlined on fordfuelinjection.com because my CEL came on yesterday (off now). I did notice after I got home, that if I had the A/C on while sitting and idling, the idle would swing from 500-1200 rpms, taking about a second to rev up and a second to come back down. As soon as I turned off the A/C, the idle would stabilize at 800 or so (normal idle as near as I can tell--aftermarket tach).
Anyway, the codes I got were the 111 code for the first section (On Demand Codes), and then I got 172 and 328 in the continuous memory codes in the KOEO test, and 111 in the KOER test.
Any ideas? Am I looking at a bad O2 sensor and a bad EGR valve? How many O2 sensors does this engine have? (It's raining out right now, so I'd rather not have to crawl under the vehicle, IYKWIM).
Thanks,
Jason
Anyway, the codes I got were the 111 code for the first section (On Demand Codes), and then I got 172 and 328 in the continuous memory codes in the KOEO test, and 111 in the KOER test.
Any ideas? Am I looking at a bad O2 sensor and a bad EGR valve? How many O2 sensors does this engine have? (It's raining out right now, so I'd rather not have to crawl under the vehicle, IYKWIM).
Thanks,
Jason
Junior User
Joined: Dec 2003
Posts: 85
Likes: 0
I believe there is just 1 O2 sensor, located past the cats. Mine was fairly easy to remove, but I've heard some horror stories. I soaked it in PB Blaster and used a socket (If you have an AutoZone nearby, they will loan you one for free) and a big breaker bar.
Check out this thread for info on the 328. I cured a continuous 327/328 by replacing a bad EVP sensor, but introduced a KOEO 328 with the new one. I suspect it's due to the pin on the new EVP being just a tiny bit too short. This seems to be a fairly common problem.
Good luck.
Check out this thread for info on the 328. I cured a continuous 327/328 by replacing a bad EVP sensor, but introduced a KOEO 328 with the new one. I suspect it's due to the pin on the new EVP being just a tiny bit too short. This seems to be a fairly common problem.
Good luck.
Last edited by eds72; May 13, 2004 at 11:53 AM.
