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help dodge v6 3.9lt idle


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anonn
New User

Nov 2, 2014, 6:32 PM

Post #1 of 7 (1328 views)
help dodge v6 3.9lt idle Sign In

Hey maybe you guys can help me.... bare with me ... I just recently cleaned the CARB ON MY DODGE RAM 91 3.9l v6 and it was running like a champ ... so I was feeling good and decided to get a new oxygen sensor since my carb was clean and to get a good reading ... went to the car parts store and the guy sold me a generic one , well that’s when things started , at idle it almost chokes out and then it revs up and starts the loop again , changed the throttle position sensor for a new one , also took a look at the map sensor and it seems to work and also gave a clean up on the idle position sensor ( it looks like a solenoid with a bolt head coming out )now after all that when my throttle position sensor is connected and I disconnect the map sensor vacuum hose the problem is mitigated a little and runs a bit smoother but if I disconnect the throttle position sensor and re connect the map sensor vacuum hose it runs good again . So to summarize, is this because the oxygen sensor is not the right one ( I connected the cables identical to all the installation guides I could find on the net) or is this some other problem ? I would hate to go get a original part for no reason (generic cost 250 pesos (I live in Mexico) but the original is something like 800 pesos) please if any body has an idea please share.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 2, 2014, 7:01 PM

Post #2 of 7 (1320 views)
Re: help dodge v6 3.9lt idle Sign In

First off, your truck doesn't even have a carb. It's fuel injected.

You took a good running engine and tried to fix it and now it doesn't run at all. It sounds like you bought a universal 0/2 sensor and didn't know how to wire it correctly. You probably should tow it to a reputable shop before you make matters worse.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



anonimous_hidden
Novice

Nov 2, 2014, 7:17 PM

Post #3 of 7 (1314 views)
Re: help dodge v6 3.9lt idle Sign In

not true the dodge ram 91 comes with a single line fuel injected carb ,holey I think is the brand , not a true fuel injection system , and there is not a lot of ways to connect an o2 sensor and I followed the instructions by the book , and down here in mexico repair shops that aren't dodge , just start pulling stuff of the motor or cheat you in repairs .... no thank you


anonimous_hidden
Novice

Nov 2, 2014, 7:18 PM

Post #4 of 7 (1310 views)
Re: help dodge v6 3.9lt idle Sign In

oh! and the car runs


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 2, 2014, 7:21 PM

Post #5 of 7 (1308 views)
Re: help dodge v6 3.9lt idle Sign In


Quote
not true the dodge ram 91 comes with a single line fuel injected carb


No such thing. It's either fuel injected or carbed and the 3.9 was all fuel injected.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



anonimous_hidden
Novice

Nov 2, 2014, 7:30 PM

Post #6 of 7 (1305 views)
Re: help dodge v6 3.9lt idle Sign In

In 1987, its first year, the 3.9 used Holley 6280 two-barrel feedback carburetors. This setup may have lasted into 1988 on Dakotas, but then Dodge slapped an EFI 2-barrel intake and induction on the 318 and the 3.9. They shared a Holley throttle body, until the Magnum versions, and used a non-vacuum advance distributor.

The fuel injection from 1988 to 1991 was single-point, central fuel injection; gas was injected into the throttle body. This system was relatively inefficient, but still easier to control and maintain than a carburetor; replacing it with a modern multiple-port injection system in 1992 resulted in a power boost (though since the heads and other parts were upgraded at the same time, partly for more interchangeability with the 318, it's hard to isolate the effect of the better injection system).

so yes it is fuel injected in to a throtle body very similar to a carburator ... but that's beside the point .... not going to a shop man , I make 10 bucks a day at work here in mexico , do you have any idea what it is ??? are universal o2 sensors known to be faulty ??? would a spec o2 sensor from chrystler?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 2, 2014, 7:34 PM

Post #7 of 7 (1302 views)
Re: help dodge v6 3.9lt idle Sign In

No, they aren't known to be faulty, just installed wrong.

You had no problem until you messed with it so it's obviously something you handled or did.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Nov 2, 2014, 7:34 PM)






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