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nybkr
Dodge Dakota
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6/11/2003
13:06:27
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 Subject: engine miss
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Let's see who can figure this one out... My '93 Dakota 3.9l 4X4 Has had a problem of starting to misfire whenever I let the fuel level drop below 1/2 tank. As soon as I filled the tank, the truck would run fine again. (I posted this question earlier this year; didn't get any responses to my question - just people describing their completely unrelated problems) After discussions with some motorheads I work with, we figured that the fuel pump must have a problem keeping it from drawing any fuel below the halfway point. Well now... here's where I'm really looking for an answer; I pulled the box off and replaced the fuel pump module with a new one. Now the damn thing misfires constantly even after filling the tank above halfway. Its worse while driving at cruising speed ( in overdrive). Can anyone shed any light on THIS problem?
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patindahat
Dodge Dakota
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6/11/2003
17:30:34
| RE: engine miss
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Message:
I woulda guessed fuel pump as well. If I were you I'd check for the new unit to see if it is faulty. And Check to see if you got crap in your fuel lines restricting flow.
If its not either of those two, I got two possible ideas.... A REALLY rare one, but are you using too high of grade fuel, so high that it doesn't always expode untill it hits someting REALLY hot with plenty of oxygen, like say the last bit of your exaust? And the far more likely: Check your ignition system.
Hope this gives you some ideas at least.
Pat
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Mark green92
Dodge Dakota
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6/12/2003
13:55:32
| RE: engine miss
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I have some ideas that may help or hinder your problem. It seems unusual that the misfire is worse now than before you changed the pump. The first thing I can think of would be to eliminate the fuel circuit of your engine. I have a fuel injector cleaning tool I purchased from Summit Racing a few years ago that will allow the engine to be run without the fuel pump. It uses a disposable aerosol can with solvent that connects to the Schrader valve and flushes the injectors until the engine quits from lack of pressure. It might be worthwhile to seek out a shop that can flush the injectors and see if the problem disappears (Pep Boys carries this solvent). See if you can get a pressure reading both with the solvent flush and with your fuel pump to rule out a bad fuel pressure regulator. If it improves, the problem is not related to the engine but should be fuel or something to do with the fuel pump/ gas tank module or the lines supplying the engine. If it shows no change it could be engine related.
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Joseph
Dodge Dakota
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6/12/2003
17:53:13
| RE: engine miss
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Hey man I have a 92 and havent had this happen, even though my fuel gauge shows empty and I have 5 gallons left. Anyways, Ive been reading some past threads and a lot of people talked about the sending unit that is in the back of the truck, actually around the gas tank I think. There is a lot of info in the 150 pages of stuff, so use them. Use the search and type in fuel, engine dying at 1/2 talk ro something.
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nybkr
Dodge Dakota
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6/23/2003
09:44:41
| RE: engine miss
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OK all; here's the answer (in case anyone was wondering): It looks like replacing the fuel pump module corrected the problem of engine misses below 1/2 tank but created a new problem. That problem being simply a plugged #6 fuel injector. It wasn't that easy to diagnose until it became complete plugged. In fact, a local dealer service shop had it in for two hours and could not diagnose even hooked up to their computer. They wanted to tear into it for a day. Another $200 just to find the problem. Not wanting to spend any more on a lost cause, I manually checked every sensor with a DMM and found all were working within spec. Only after pulling the connectors off of the injectors, one at a time, did I find that the # 6 injector was plugged. No error code because electronically, it was still firing the injector correctly. A complete fuel system purge (BG service) at another dealer corrected the problem. End of story.
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