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mstaines227
Dodge Dakota
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12/01/2009
13:48:34
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 Subject: 1993 3.9L intermittent mis-fire
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1993 3.9L, 90K miles. Cranks/runs fine until it mis-fires/back-fires losses power at ant speed. I have pressed accelerator to floor and when it rpm is above 3000rpm, it would regain timming and run fine. Now I have to stop and let engine idle, when it reached idle rpm it will lope low and either regain its timming or shut off. If it shuts off, it will restart and run fine until the next time which could be 2 minutes, 2 hours, or 2 days. I have replaced the distributor, timming chain, plugs/wires, coil, o2 sensor, crank sensor, and fuel filter from fuel tank. Please HELP...
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well
Dodge Dakota
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12/01/2009
15:29:09
| RE: 1993 3.9L intermittent mis-fire
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Said you replaced fuel filter no mention of fuel pump. So check fuel pressure and where it is a 93 check the under hood wire splice.
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dakownr
Dodge Dakota
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12/01/2009
23:16:12
| RE: 1993 3.9L intermittent mis-fire
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I just got done fixing a similar annoying and hard to find problem on my '96 5.2. Before you check the aforementioned fuel pump and wire splice, try this- While your engine is idling in your driveway, wiggle the two wires that plug into the bottom of your coil. They may be broken, or not contacting properly with the prongs in the coil. If it is a problem with these wires or the connection, the truck will noticeably miss or shut off. It would not be a bad idea to have an inline spark testor connected to one of the cylinders while your doing this so that you can see whether it is in fact a faulty connection at the coil.
If it is not that, the next easiest thing would probably to chek the splice that "well" mentioned. The splice is under the power distrubution box (black plastic box with fuses and relays inside) on the driver's side fender. You will have to cut away all the tape to find it, but it's not that bad. I believe that it is two wires going into one. Good luck and keep us posted.
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dakownr
Dodge Dakota
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12/01/2009
23:23:49
| RE: 1993 3.9L intermittent mis-fire
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Almost forgot- did you check/replace your tps (throttle position sensor)?
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freeks-u
Dodge Dakota
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12/02/2009
18:00:29
| RE: 1993 3.9L intermittent mis-fire
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Message:
its the splice!!!!!
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francij1
Dodge Dakota
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2/02/2010
20:54:08
| RE: 1993 3.9L intermittent mis-fire
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Message:
What if it is not the splice what next?
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New Engine
Dodge Dakota
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2/02/2010
21:57:52
| RE: 1993 3.9L intermittent mis-fire
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Message:
What if it is not the splice what next?
*Engine*
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?
Dodge Dakota
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2/04/2010
08:49:05
| RE: 1993 3.9L intermittent mis-fire
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Message:
If , still no better ; possible EGR valve/sensor assembly , back beside the distributor .
Not too expensive - should be under $ 75.00 ..
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Bob Lincoln
Dodge Dakota
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2/04/2010
09:08:53
| RE: 1993 3.9L intermittent mis-fire
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Check fault codes before spending money.
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Curly
Dodge Dakota
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2/04/2010
15:28:36
| RE: 1993 3.9L intermittent mis-fire
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Message:
"if , still no better ; possible EGR valve/sensor
assembly , back beside the distributor .
Not too expensive - should be under $ 75.00 .."
If so he would have fault code 32
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Warrior
Dodge Dakota
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2/05/2010
00:53:51
| RE: 1993 3.9L intermittent mis-fire
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Message:
Exhaust plugged. Simple!
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Bucket
GenII
2/05/2010
10:07:17
| RE: 1993 3.9L intermittent mis-fire
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I tend to lean toward plugged catalytic converter, which i dont believe will spit a code.
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daddio
Dodge Dakota
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2/05/2010
10:33:29
| RE: 1993 3.9L intermittent mis-fire
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Message:
How is a plugged exhaust going to cause an intermittent problem?
Besides, I doubt that mstaines227(The O.P.) is coming back to find an answer.
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Bob Lincoln
Dodge Dakota
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2/05/2010
19:00:31
| RE: 1993 3.9L intermittent mis-fire
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Message:
Bucket You would lean any direction you could so
long as you was taking one in the rear.
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Warrior
Dodge Dakota
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2/05/2010
19:02:52
| RE: 1993 3.9L intermittent mis-fire
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"which i dont believe will spit a code"
bucket what would you know about spitting?
you never miss a drop
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jacob
Dodge Dakota
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3/15/2011
00:34:19
| RE: 1993 3.9L intermittent mis-fire
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Message:
im having a problem with my 93 dakota v6 it start and idles fine . once i give a little gas it goes i give more gas it sputters and caughs backfires or like cuts out than i give it more gas it comes outta it . so i have a proble right in the middle of accelerating whats wrong!!!!
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Allen
Dodge Dakota
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3/26/2011
20:58:09
| RE: 1993 3.9L intermittent mis-fire
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Message:
I have a 92 3.9 which had an intermittent mis fire also. I put an aluminum "gasket" under the egr valve to see if that was the problem and it was. I was quoted $105.00 for an egr valve at my local NAPA store. I had another 92 a while back and the catalitic converter plugged at 120,000 plus. That acted like a bad fuel pump... took a lot of experimenting to get it figured out.
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