| From | Message |
Jimmer
Dodge Dakota
JOIN HERE
11/20/2004
20:27:38
|
 Subject: Bucking
IP: Logged
Message:
I have a 2000 Dak R/T. It has about 50k miles and I have had a problem for about the last 25k with intermittent bucking. It doesn't matter whether the truck is warmed up or not.
The only thing that seems to be consistant is that when the symptom occurs if I put my foot to the floor the bucking stops. I have replaced the plugs, wires, cap and rotor. I've run a couple bottles of fuel system cleaner through.
I have also noticed that the symptom sometimes happens as I pass over a series of bumps. Kind of a give and go feeling.
I have considered replacing the throttle position sensor. I suspect that there is a loose connection on a sensor or in or around the CPU. But I have no reliable trouble shooting procedure to find this. The check engine light hasn't come on so I assume that there arn't any codes stored.
I hate to just keep replacing parts until the problem clears, seems counter productive. I don't trust that the dealer is any better equipped. I'm afraid that they will use the shotgun technique and saddle me with the bill.
Has anyone had similar problems?
Jim
|
furball69
Dodge Dakota
JOIN HERE
11/20/2004
22:59:24
|  RE: Bucking
IP: Logged
Message:
Kinda sounds like something blocking the fuel. Start with the fuel filter. Could be foreign matter in the tank; rust etc., fuel pressure regulator, fuel pump.
|
Kowalski
GenIII
11/21/2004
07:22:43
|  RE: Bucking
IP: Logged
Message:
No disrespect intended, but it sounds like that's the last thing Jimmer would need to worry about. Fuel delivery problems get worse when fuel demands go up; yet Jimmer says his truck gets better when he floors it. If it runs well in open loop, but poorly in closed loop, it is likely a sensor or connection as he suspects. Concentrate on sensors that are not read in open loop, as you probably already know; sorry I can't pinpoint this for you any better. Maybe someone else can.
Lead, follow, or get out of the way
|
mopar_man
Dodge Dakota
JOIN HERE
11/21/2004
07:28:21
| RE: Bucking
IP: Logged
Message:
I had a had the same symptons with my dakota.The problem turned out to be an oxygen sensor.This may or may not be your problem but it is something you can check.
|
Jimmer
Dodge Dakota
JOIN HERE
11/21/2004
10:16:38
| RE: Bucking
IP: Logged
Message:
Thanks all.
After refreshing my understanding of the Theory of Operation on the PCM and supporting sensors et al. I agree that the problem seems to be evident in the closed mode.
Given that the battery is strong and the voltage sources are stable. And the symptom is there whether the AC is on or off.
Since my Dak uses 2 O2 sensors; is one more likely than the other to malfunction? I would guess that the upstream sensor could be the culprit since it is always under high temp load. It also has elements in it that can flex under vibration.
Heat = stress = ware = malfunction. Especially with electronic components.
The MAP could cause this problem but it wouldn't be my first guess. The crank, camshaft and throttle position sensors are also potential problems.
Is there a hierarchy of failures that you guys follow? I think it might be: O2, Crank, Cam, Throttle, MAP.
Does one malfunction more than others?
|
matt
Dodge Dakota
JOIN HERE
11/22/2004
05:01:32
| RE: Bucking
IP: Logged
Message:
sounds like a tps issue to me....
if you've got a volt meter, check the tps, it should be close to .7 volts. http://www.intense-dakota.com/tips%20and%20tricks%20pages/tps_modification.htm goes through how to mod the TPS, but it also gives the basis for where the tps should start at at closed throttle...and which wires to use.... check that the voltage increases as you sweep to half throttle....
|
| | P 1 |
|
Post a reply to this message:
Username Registration: Optional
All visitors are allowed to post messages
|
