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Elepants
Dodge Dakota
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8/15/2011
01:22:29

Subject: 93 Dakota afterfire. Lost.
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Ok, I need some help here. I've been trying to figure out this issue for quite some time now. Read through countless pages of forums on numerous sites, and I still can't resolve it.

I have a 1993 Dodge Dakota, 2 DR with a 3.9, 186k miles. Idles fine, the problem is that it will pop from the exhaust with any touch/movement of the throttle. It does this constantly.

Thing I've already replaced: ECM, TPS, CPS, IAC, O2 sensor, PCV valve, EGR, timing set, wires and plugs (gaped to .035), intake manifold gasket, engine coolant sensor. Removed throttle body and cleaned it, checked all vacuum hoses and replaced all bad ones and made sure they were routed correctly. Checked injectors and installed new o-rings. Checked distributor cap. Checked combustion and fuel pressure.

TPS? With the TPS mounted to the throttle body, any throttle movement (manual or from the pedal) will result with popping. Unbolting and removing the TPS from the TB, but leaving it connected, I can rev the engine as much as I want without any problems. No backfire/afterfires, nothing. Getting a 4.99 volt from the purple+black wires, .77 from orange+black. Didnt get to check the range with throttle movement or resistance yet. Is the TPS the issure? Possibly the MAP? Or is it something else completely?



Bob Lincoln
Dodge Dakota
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8/15/2011
08:36:53

RE: 93 Dakota afterfire. Lost.
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Check fault codes.

http://www.allpar.com/fix/codes/index.html

It's possible that the timing chain is worn, especially if you have never replaced it, and the valve timing is off relative to the ignition timing. I don't think it's the TPS.



daddio
Dodge Dakota
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8/15/2011
13:36:58

RE: 93 Dakota afterfire. Lost.
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I saw timing set on your list of replacement parts. Check for worn distributor bushing or worn distributor itself.



FireMan
Dodge Dakota
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8/16/2011
17:47:32

RE: 93 Dakota afterfire. Lost.
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Why she burn up?



Elepants
Dodge Dakota
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8/16/2011
18:20:19

RE: 93 Dakota afterfire. Lost.
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Thanks for the quick response and input. Went and pulled the distributor out and reran the plug wires to make sure they were correct. Seems my distributor had turned just far enough off the no. 1 cylinder to cause the issue. Put it back in and made sure everything was aligned. Truck runs perfect now! Again, thanks so much!



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