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hugo92
Dodge Dakota
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1/18/2010
16:31:27
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 Subject: 92 3.9L died, no spark
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I have a '92 dakota 3.9L 5 speed 2wd. It has just over 150,000kms on it. The owner of the truck before me had had some electrical issues with it. Sometimes when you are accelerating and get to 3000rpm the engine will sputter and back fire occationally. It has only happened to me a few times. The one time it did happen to the guy before me it blew the rotor inside the cap apart. That was replaced and it runs decent now. I live in a small town and during the winter, the engine does not get a whole lot of time to warm up when I drive it to work. Lately at times when I do not plug my truck in for the cold nights the engine will sputter and almost die for about 5 min and then it will run smooth. I figured it was from a possible carbon build up inside the engin so I decided to take it on a little tour around the countryside. After I had turned one corner and accelerating, I was nearing 3000rpm and just as I pressed in the clutch to shift it backfired and stalled the engine. I got it pulled back to town but now I have no spark, not even coming out of the coil. Also once when I went to try to start it I noticed that the first revoloution sounded funny, almost as if the engine was about to lock up. Now it just spins over with no spark. Is this a timing issue as well as an elecrical issue or just an elec. problem?
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well
Dodge Dakota
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1/18/2010
22:05:14
| RE: 92 3.9L died, no spark
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2 things come to mind,
start with the under hood wire splice.
(known notorious problem for your yr. truck)
To check the wire splice,
Open hood inner side fender well
Black fuse/relay box, carefully remove it
Un'do tape from wire harness
You are looking for a 3 to 4 wire splice
usually red/white you are checking where they all connect
they either get all crudded up or snap off altogether.
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Bob Lincoln
Dodge Dakota
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1/19/2010
08:50:52
| RE: 92 3.9L died, no spark
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And the second thing?
Timing chain has probably worn or stretched. Valve timing is off and it's backfiring through the intake.
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wow
Dodge Dakota
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1/19/2010
08:54:38
| RE: 92 3.9L died, no spark
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Mr Intelligent
Tell us all how a stretched timing chain would cause an engine to lose spark?
I for one am dying to hear this
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LOL
Dodge Dakota
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1/19/2010
09:56:22
| RE: 92 3.9L died, no spark
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i cant wait to hear this one either!
this should be as good as the ac advice he gives from 20 year old text books! LOL
hey bobby boy
why you on this site anyway?
remember you said your site was better
so get yer lame azz back over there
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Finster
Dodge Dakota
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1/20/2010
03:18:46
| RE: 92 3.9L died, no spark
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Please tell me how a stretched timing chain gives a no spark
condition?
I need a good dump this morning!!
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Nolan
Dodge Dakota
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1/21/2010
01:17:15
| RE: 92 3.9L died, no spark
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Have you check the distributor itself? I had a problem where I getting power to the coil for a split second then off. The fuel pump sound came on and was fairly new so I thought that was fine. Turned out to be the distributor. I am that mechanically inclined so I kinda went out on a limb and bought the new dist, so just trying to point you to a possible direction.
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Ben
Dodge Dakota
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1/23/2010
13:13:35
| RE: 92 3.9L died, no spark
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I had this problem with my 93, it was the crankshaft sensor.
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well
Dodge Dakota
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1/23/2010
16:23:42
| RE: 92 3.9L died, no spark
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Message:
It could be 101 things, None of which would be the timing chain.
hugo Can you hear the fuel pump prime when you turn the key on?
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Tyler V
Dodge Dakota
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1/23/2010
19:24:30
| RE: 92 3.9L died, no spark
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If the timing chain was off the valves would be BENT
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Right
Dodge Dakota
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1/23/2010
21:58:48
| RE: 92 3.9L died, no spark
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Message:
Slipped timing chain -
Bent Valves - result = No Spark
NOT!
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Tyler V
Dodge Dakota
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1/23/2010
22:00:46
| RE: 92 3.9L died, no spark
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Im not saying thats why he's got no spark. But if the chains slipping it's been doing it for a long time and the motor is not in time anymore.
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dakota04
Dodge Dakota
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1/24/2010
16:48:24
| RE: 92 3.9L died, no spark
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Its a bad distributor, my 93 3.9 was defective. housing not bored concentric. check it.
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Doc Brown
Dodge Dakota
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1/24/2010
21:54:09
| RE: 92 3.9L died, no spark
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Message:
No it's the Flux Capacitor
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Sparky
Dodge Dakota
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1/24/2010
23:36:14
| RE: 92 3.9L died, no spark
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Message:
Light her up!
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?
Dodge Dakota
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1/25/2010
09:09:01
| RE: 92 3.9L died, no spark
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Message:
If still trying to find problem
May be bad coil - shorted out high voltage
usually caused by worn ,burnt plugs ..
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Dakota04
Dodge Dakota
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1/25/2010
09:49:15
| RE: 92 3.9L died, no spark
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The best clue here is" the rotor inside the cap blew apart"
Because the shaft is not concentric with the housing, or has too much play in the bushings.
mine would take out the pickup sensor.
This was on a 93, 3.9.
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hugo92
Dodge Dakota
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1/25/2010
10:12:36
| RE: 92 3.9L died, no spark
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Upon further inspection of the distributer I found that the drive gear for it had a flat spot.
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stevedak
Dodge Dakota
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1/26/2010
06:50:41
| RE: 92 3.9L died, no spark
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Hugo, I think you found a problem but not the root cause. I think Bob Lincoln could be right.
Your Timing chain could have been the problem. Timing chains stretch. The 92 V6 did not have chain tensioners, so the chain will eventually stretch and flop around until it skips a tooth on the timing gear, breaks a tooth on the gear or the chain breaks altogether. If there is too much slack in the chain or if it jumps a tooth, its no longer in time. If the crank sensor is out of sync from sensor in the distributor, you won't get a spark. If you are just marginally out of sync, it will backfire. Newer cars with tensioners don't have problems til they're really bad or simply break. Besides the flat spot Hugo found, the distributor bushing can wear out creating a lot of freeplay. A loose timing chain or distributor shaft bushing probably caused the damage to the drive gear.
You can take the distrib cap off and try to turn the rotor back and forth, see how much play there is, it should only be a few degrees (2 or 3) or 5/16 inch or so (not exact, I'm going from memory). Too much play or wobbly action from the rotor means the bushing is bad.
With the dist cap off, turn the crankshaft bolt clockwise til you line the crank timing mark to TDC. Then turn the crankshaft CCW til you see the rotor move. Measure how far you turned the crank before the rotor moved. The rotor should move within about 6 degrees of crank movement. If you go much more than 6 degs, you got a stretched chain. Some timing gears are also covered with nylon, when the nylon breaks off, it makes the chain much looser.
There's still a place for old school mechanics
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stevedak
Dodge Dakota
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1/26/2010
07:18:54
| RE: 92 3.9L died, no spark
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On second thought, since the sensor in the dist is mainly for fuel sync, you may still get spark if it gets out of wack from the CPS. But the drive gear doesn't just break, need to find what caused it, timing chain or bushing. BTW, if you replace the bushing, the new one needs to be burnished when installed.
Old school mechanics suffer from memory loss
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LOL
Dodge Dakota
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1/26/2010
11:12:04
| RE: 92 3.9L died, no spark
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Message:
Yet another idiot!
But then again could be bobby boy just posting under another name.
Old school or new school
Why don't you tell us just how a stretched
or worn timing chain would cause an engine to lose spark??????
Look forward to your reply Mr Mechanic
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