| From | Message |
97Dakota3.9
Dodge Dakota
JOIN HERE
9/26/2005
17:28:09
|
 Subject: Have a miss at cruise
IP: Logged
Message:
Been having some issues here lately with my dakota. If I am cruising at around 2000rpm, I have what seems like a miss every so often. I also have noticed that when I am going up a long hill or something and have a load on the engine, it seems to be knocking, like rattling valves. I pulled the plugs this weekend and there does appear to be some aluminum flake on the tips, which I am told is a sign of knocking. Not sure if the two issues are related. No check engine light or anything. What do you think is the cause of the miss - clogged injectors?
As far as I know the ignition system is in good shape.
|
Gunner
Dodge Dakota
JOIN HERE
9/26/2005
20:56:55
|  RE: Have a miss at cruise
IP: Logged
Message:
When you say cruise, do you mean when you have cruise control on? If so, does it feel like the truck is "bucking" and the tach jumping up 100-200 rpm? If this is happening, then it could be your Throttle Position Sensor--which is a pretty easy fix. My truck used to jump 100-200 rpm on cruise control (especially on hills). All I did was set the TPS voltage to .75 and the problem stopped. Some people have had to replace the whole sensor, but before you do that I would recommend setting the voltage correctly.
|
ac
Dodge Dakota
JOIN HERE
9/26/2005
21:38:48
| RE: Have a miss at cruise
IP: Logged
Message:
you sure it isnt your ac clutch kicking in? that happened to me and it sounds like a miss..
|
hum
Dodge Dakota
JOIN HERE
9/27/2005
09:31:57
| RE: Have a miss at cruise
IP: Logged
Message:
are you using any oil. A leaky plenum gasket will cause pinging.
|
97Dakota3.9
Dodge Dakota
JOIN HERE
9/27/2005
15:36:26
|  RE: Have a miss at cruise
IP: Logged
Message:
Cruise control isn't on. Just meant like I was driving at a steady rpm. And yes it jumps around by like a 100-200rpm. I will check into the tps.
I don't think that I am using any oil. What is the plenum gasket?
|
Wadak
GenIII
9/29/2005
19:25:14
| RE: Have a miss at cruise
IP: Logged
Message:
97Dakota3.9
Possible TPS problem, how many miles on your truck.
92 and 97 Daks both with many mods.
|
cuzindoug
GenIII
9/29/2005
19:33:48
| RE: Have a miss at cruise
IP: Logged
Message:
Your plenum gasket is the gasket on the bottom of your intake manifold between the manifold and the plenum plate. (It is just a "cover" gasket) It is notorious for leaking on the magnum engines. Best way to check if it is leaking is by taking of the "air hat" on your throttle body and looking down into the manifold with a flash light. If you see oil, then you have a leaking gasket. Personally I think you problem is the TPS like a couple people have already said. Mine went bad within the last 5000 miles and it did the same thing your truck is doing.
If it ain't broke, fix it til it is.
|
97Dakota3.9
Dodge Dakota
JOIN HERE
9/30/2005
10:00:33
| RE: Have a miss at cruise
IP: Logged
Message:
Wadak and cuzindoug I have about 115,000 miles on it. I hopefully will get to check it out this weekend when I go home. Thanks for the help.
I will also try the flashlight test for the plenum gasket.
|
Luke
Dodge Dakota
JOIN HERE
9/30/2005
10:19:20
| RE: Have a miss at cruise
IP: Logged
Message:
Had the same thing. It was the TPS on my truck 99 3.9 4x4
|
wadak
GenIII
9/30/2005
20:20:13
| RE: Have a miss at cruise
IP: Logged
Message:
I had a bad TPS on my 4x4 Dakota and at certain speed it would start "bucking". When I changed it, the problem cleared up. The best way to check a TPS is to use an analog voltmeter. Connect the positive lead-red to the center of the CPS and the negative-black lead to ground. Turn on the ingition don't start the truck. The initial reading should be about .5 to .7 volts. Then grasp the accelerator cable connected to the throttle-body and slowly open it up and the voltage on your voltmeter should increase smoothly. The "swing" on the voltmeter should be smooth, not jerky or intermittent on rising. If the meter swing is intermittent or drops then rises again you have a defective TPS.
A TPS is very much like a volume control on your radio. If you turn it and it sounds scratchy thats exactly what your TPS does. The scratchyness create spikes the computer can't handle very well so it's starts missing or bucking.
92 and 97 Daks both with many mods.
|
IntenseDak39
*GenIII*
9/30/2005
21:17:00
| RE: Have a miss at cruise
IP: Logged
Message:
i had the exact same problem on my 5.2 durango. It would only do it every so often.. pronounced more if going up a big hill.
After further inspection, it turned out to be the cheap cap/rotor i bought.
|
97Dakota3.9
Dodge Dakota
JOIN HERE
9/30/2005
22:00:03
| RE: Have a miss at cruise
IP: Logged
Message:
Well, I hooked up the voltmeter. 0.66V a idle position, truck off. Pushed the accelerator cable slowly and the voltage rose steadily to 3.8V at wide open throttle, truck off.
I also did the light test as suggested and it did look like oil down in the intake. I used the method suggested here
http://www.v8performance.com/BellyPan_TSB.pdf
using a vacuum gage to test the plenum gasket being bad. And according to the gage, the gasket should be good.
So now I don't know what the deal is?
|
Wadak
GenIII
9/30/2005
22:16:17
| RE: Have a miss at cruise
IP: Logged
Message:
How much oil are you using, on my 92 4x4 5.2 I was using about a quart every 1000 miles and it would ping under heavy acceleration. The next is to replace your plenum gasket. You might want to consider getting the plenum kit from Hughes engine. They supply a aluminum 1/4" plate with the a flexible metal gasket and I think new bolts. The factory plenum plate is made of steel and the intake manifold being aluminum. Aluminum has a different heat expansion rate than steel thats part of the problem. Although you can use your existing plate, but get the Dodge Plenum gasket, its flexible metal. When I had to do mine I was unaware of the Hughes Plate at the time so I bought a new factory steel plate and metal gasket. I have had it on my 5.2 dak for over 25,000 miles and no problems so far. If I had to do it over again, I would use aluminum.
Good to see you posting Intense how is Texas these days.
92 and 97 Daks both with many mods.
|
bigdave
Dodge Dakota
JOIN HERE
10/12/2005
22:47:53
| RE: Have a miss at cruise
IP: Logged
Message:
My 97 did the exact same thing, it ended up being a broken wire that goes to the coil, one of the two small wires. I didnt have time to fix it so I wiretied it up so it wouldnt move.
|
| | P 1 |
|
Post a reply to this message:
Username Registration: Optional
All visitors are allowed to post messages
|
