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JT
Dodge Dakota
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8/13/2008
18:33:52

Subject: 1992 3.9
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I am at my ends here, about to roll it in the street and light it on fire. I have fuel pressure replace inline fuel filter, pcv , MAP sensor, TPS , Idle control, plugs wires, rotor and cap. Has a full tank of fuel. replaced broken vacume line. and the truck starts idle errattically i hear it sucking air "not a vacume leak" its from the TB at idle control valve. then it straves it self and dies. throttle does nothing except when erracticaly pumped RPMS can get to 1800 and dies. Help Please....



dakota49
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8/13/2008
20:55:54

RE: 1992 3.9
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Have you run the codes? turn the switch on and off 3 times, not to start but so all the lights come on then on the 3rd time leave the key on, it should give codes either in the odometer or the check engine light will flaSH, but I think only the throttle bodies use the check eng. light to flash out the codes. It sounds as though the IAC (idle air control valve is dirty, or the problem. If you take it out to clean just use spray cleaner and don't touch the valve its self, when clean spray into the hole where the valve goes as well.
Good Luck
Dakota49
1988 3.9 4X4 5speed



JT
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8/13/2008
21:33:43

RE: 1992 3.9
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the only codes are 12 and 55 i replaced the IAC today ,sprayed cleaner ran nice while spraying cleaner then died and back to where i was...
I did have a engine code of 27 at one time but after replacing everthing just 12 and 55.



hey
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8/13/2008
22:57:55

RE: 1992 3.9
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how old is the battery?

sounds like a wiring issue to me



YEPP
Dodge Dakota
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8/13/2008
22:59:42

RE: 1992 3.9
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yet another new post
another new name
and gee who is first to respond?

C'mon just use the names you been using49
we all know who you are



Bob Lincoln
Dodge Dakota
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8/14/2008
08:09:06

RE: 1992 3.9
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It's a vacuum leak. Probably the intake manifold. Check the vacuum reading if you can keep it running.



J and J Auto
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8/17/2008
00:05:03

RE: 1992 3.9
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If the IAC is steping back and drawing more air
and starving

pull a plug when it does that and see if its dry

sounds like a fuel regulator problem

some of the 92's the early ones had a external
vac operated regulator and saying it had an inline
fuel filter it may be one with this setup

What it does is when under excelleration the vac
droping raises the fuel pressure 5 to 10 psi

The newer setup actualy switches the volts on the
fuel pump under hard excelleration and raises the
pressure slightly usualy at wot WIDE OPEN THROTTLE

follow the gas line to see if you have the
external regulator these systems also had a return
fuel line was used on the vary early 92's

Larry
J&J Auto

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