97 Ranger Tailpipe emissions failure
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97 Ranger Tailpipe emissions failure
I know this may be pretty vaugue, but I had thought that before when leaving a question and people in this forum seem to hit the nail on the head every time. So here it goes, I will give as much info as I can even though it may not be necessary.
I have a 97 Ranger that recently was throwing a P1446 DTC, it wound up being the Evap purge flow solenoid which a few people in here thought it was.
I took it to Sticker Stop for inspection today and it failed the NOx tailpipe emission test. The limit is 553 and it read 658, all the other readings were good.
Last year it read 537 and the year before it read 518.
When I hooked the OCB 2 scan tool to it last week to double check a few things one of the people I work with who is pretty good with the
scan tool told me, (and I am trying to get the description here right but it may be a little off), That the long term fuel.....something I can't remember, was giving a negative percentege reading which meant that I was running rich. I don't know if that has anything to do with it.
Last year I replaced the spark plugs and did not use OEM plugs, it passed the emission test that year, but the reading was higher from the previous year. Since then I was reading the Ranger service manual and saw it actually uses 2 different kinds of plugs, P and PP I think.
I don't know if that may be contributing to the problem.
I know this is kind of vaugue, but any feed back would be greatly appreciated.
Thanks,
Brian
I have a 97 Ranger that recently was throwing a P1446 DTC, it wound up being the Evap purge flow solenoid which a few people in here thought it was.
I took it to Sticker Stop for inspection today and it failed the NOx tailpipe emission test. The limit is 553 and it read 658, all the other readings were good.
Last year it read 537 and the year before it read 518.
When I hooked the OCB 2 scan tool to it last week to double check a few things one of the people I work with who is pretty good with the
scan tool told me, (and I am trying to get the description here right but it may be a little off), That the long term fuel.....something I can't remember, was giving a negative percentege reading which meant that I was running rich. I don't know if that has anything to do with it.
Last year I replaced the spark plugs and did not use OEM plugs, it passed the emission test that year, but the reading was higher from the previous year. Since then I was reading the Ranger service manual and saw it actually uses 2 different kinds of plugs, P and PP I think.
I don't know if that may be contributing to the problem.
I know this is kind of vaugue, but any feed back would be greatly appreciated.
Thanks,
Brian
Elder User
Joined: Aug 2002
Posts: 773
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From: VA/USA
97 Ranger Tailpipe emissions failure
I'm about 99% certain the "P" is platinum and the "PP" is double platinum. I believe the late model Ford ignition systems are pretty dang picky about spark plugs, and there seems to be overwhelming consensus that OEM plugs are the way to go - you'll probably do as well with Autolite as with Motorcraft as they are very similar, if not in fact identical. Ken00, as well as several other people were helpful to me in understanding what was best for my `99 3.0. Good luck - please keep us informed - Thanks, Glenn . . . PS you might check my post from a couple weeks ago - topic "SPARK PLUGS" 
