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sspeedstreet
Dodge Dakota
JOIN HERE
7/24/2003
20:48:01
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 Subject: 1993 3.9 5-speed misfire
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Message:
I looked through the archives, but didn't come up with a solution to this problem.
I started getting what seems to be a misfire after 20 or 30 minutes of freeway driving. It's not a miss, it's a real jolt! It will continue to get worse until it's not drivable.
I checked the codes and only get a 55.
I had it into a shop and they replaced plugs, wires, cap, fuel filter.. no improvement.
Anybody have a suggestion?
Neil
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Shank
GenII
7/24/2003
22:56:40
|  RE: 1993 3.9 5-speed misfire
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Message:
How many miles?
Sounds like could be one of many things,
1. Bad Injector(s)flooding the cylinder and pumping unburnt fuel into the manifold where it is fired by the neighbor cylinder. Aren't neighbors great :p
2. Bent/Burnt Valve(s), Exhaust valve not closing completely causing the compression stroke to perform #1 above.
3. Bent pushrod(s), Vavles not pushed far enough for proper clearance causing #2 to happen (no, not that #2..... the one above this)
4. Heavy Carbon buildup in Engine. Your valves might be fine but due to the carbon buildup they may be sticking in the open/close position causing #2 to happen.
5. Timing, Loose/worn timing belt or Distributor causing erratic firing sequences.
Is it only doing it as the engine gets hotter? Could be a blown gasket between the intake/exhaust port or crack between the two in the head.
Before you attempt heavy duty engine surgery, run your fuel down as empty as you trust, pour in 2 cans of B-12 Chemtool and fill your tank to 1/2 with Super Unleaded. Get out on the highway and drive the snot outta it. the B-12 will clean your Fuel Rail, Injectors, Fuel Runners, Intake Valve, Cumbustion Chamber and Exhaust valves.
If this doesn't work, Find you an Engine Surgeon.
Btw, Where are you Located?
Good Luck,
Shank
If it don't work hit it with a hammer, Still don't werk? GET A BIGGER HAMMER!
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J and J Auto
Dodge Dakota
JOIN HERE
7/25/2003
02:07:10
| RE: 1993 3.9 5-speed misfire
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Message:
Almost sounds like your crank sensor
Larry
J&J Auto
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sspeedstreet
Dodge Dakota
JOIN HERE
7/25/2003
11:49:34
| RE: 1993 3.9 5-speed misfire
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Message:
Thanks for the replies.
The truck has 64,000 miles. It needs to be driven a ways (warmed up) before it happens. Wouldn't a faulty crank sensor be a problem at any temperature?
I have heard timing chain stretch will cause this to happen. It was checked and yes, there is some, but I didn't get the impression it was excessive.
I'll try the B-12 Chemtool next. Sounds like a simple enough thing to do.
"Btw, Where are you Located?" Santa Maria, CA. How about you?
Neil
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sspeedstreet
Dodge Dakota
JOIN HERE
9/13/2003
16:01:35
| RE: 1993 3.9 5-speed misfire
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Message:
I finally got this solved and thought I'd pass it on:
Worn distributor or bad electronics there-in. New distributor, no more mis-fire.
Neil
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J and J Auto
GenII
9/13/2003
16:51:22
| RE: 1993 3.9 5-speed misfire
IP: Logged
Message:
Could be your coil,
see what the plugs look like when it acts up, if
black and wet spark if light and dry fuel
Check the conections on all your wires, they do
aroad and lose contact.
Larry
J&J Auto
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