Code 99 will not idle
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Laughing Gas
Joined: Feb 2007
Posts: 821
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From: hohenwald, tn
Code 99 will not idle
92 ranger 4.0 throws a code 99. It just will not idle. It has had everything you could replaced, I swapped computers put a new iac on, and it just won’t idle. Help!!
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Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
I see you don't have any replies yet, so I'll see if I can get things started.
Lots of unknowns. Did the problem come about slowly over time, or begin suddenly after some event? Is it that it stalls at idle, or just a rough idle? EDIT: Is this a auto, or manual tranny 4.0L?
Post up the things you've replaced & if they were faulty, or you just tossed a part at the problem hoping for joy. Also tell us all of the trouble shooting performed so far.
Post any other trouble code clues you have, as they might be able to help focus your trouble shoot. If you have, or can come by a scan tool that'll display live sensor feeds, like fuel trim, MAF, O2 sensors switching range & speed, post up those Numbers too.
Some beginning trouble shooting thoughts for consideration.
Lots of unknowns. Did the problem come about slowly over time, or begin suddenly after some event? Is it that it stalls at idle, or just a rough idle? EDIT: Is this a auto, or manual tranny 4.0L?
Post up the things you've replaced & if they were faulty, or you just tossed a part at the problem hoping for joy. Also tell us all of the trouble shooting performed so far.
Post any other trouble code clues you have, as they might be able to help focus your trouble shoot. If you have, or can come by a scan tool that'll display live sensor feeds, like fuel trim, MAF, O2 sensors switching range & speed, post up those Numbers too.
Some beginning trouble shooting thoughts for consideration.
Thread Starter
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Laughing Gas
Joined: Feb 2007
Posts: 821
Likes: 0
From: hohenwald, tn
It is a friends. It was her dads. It has been worked on by everyone who has a wrench. It goes good down the road, but just doesn’t idle. That code 99 is all I get. I have been looking at breakout boxes but don’t know enough about them. It is auto
Moderator
Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
Ok good feedback. Since it'll idle for a bit, until the CEL turns on & the code pops up, have you or any of the other wrench turners looked into the 99 code = EPC (Electronic Pressure Control) circuit failure & attempted to put it right ? EDIT: I see you didn't say you've tried to start & idle it in "N", so tell us if it'll idle ok in Neutral.
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