Dodge Problem

miner09 · Sep 10, 2021

This is not tractor related but I know some of you have Dodges. Got 2004--3500 that runs fine going 65 then it will slow down to 30 mph. Want throttle up. You can stop turn it off then start it and it will run OK. You never know when it's going to do it. Doesn't give a code. Had it in several shops including Dodge dealer. Everyone has given up and don't have a clue. Had lots of parts put on but hasn't fix it. Has 100,000 miles. Anyone had this problem?? Appreciate any help. Thanks

Stephen Newell · Sep 10, 2021

Smells like a fuel problem to me. The 2005 Dakota I have doesn't have a fuel filter between the gas tank and the engine. That is usually the first thing I change on a vehicle. My guess is either the fuel pump is going out or the sock on the pickup tube is getting debris in it.

ArleninOr · Sep 10, 2021

Gas or Diesel?

wrenchere85 · Sep 10, 2021

Sounds like the sock on the pickup tube is plugging up. I had that same problem on a 99 Ford diesel.

Geo-TH,In · Sep 11, 2021

Sounds like a choked muffler or cadillac converter.
Try removing the exhaust system and see what happens.

ASEguy · Sep 11, 2021

How long does it have to sit before you can start it up and it run ok? Does it slow only on a hill or does it matter?

ASEguy · Sep 11, 2021

And is it predictable?

Richard G. · Sep 11, 2021

My 99 Dodge did that years ago.
Turned out to be a bad map sensor.
Replaced it myself and good to go.

JWA · Sep 11, 2021

Fuel delivery problem,check your fuel pump.

Brown Dirt Cowboy · Sep 11, 2021

(quoted from post at 05:20:57 09/11/21) And is it predictable?

e said"You never know when it is going to do it"

DoubleO7 · Sep 11, 2021

(quoted from post at 08:51:33 09/11/21) Sounds like a choked muffler or cadillac converter.
Try removing the exhaust system and see what happens.

uote

Once clogged, how does it become unclogged after not running for a few minutes?

miner09 · Sep 11, 2021

Gas. Converter has been gutted. Slows on level ground. Just stop and restart then ok.

dcarp · Sep 11, 2021

Possibly Throttle Position Senser. My 03 acted sorta like that, but it did set a code. $800 at dealer $21 Amazon.

Deutz Lover · Sep 11, 2021

Although unlikely check the gas cap to make sure it can inhale. I had that happen on an old Toyota truck. After rebuilding the carburetor and replacing the float I finally figured it out when I noticed it would not run well when it was raining and the barometric pressure would drop. A vacuum would form in the tank, starving the carburetor. This can also happen in a diesel.

It is a quick check compared to the other possibilities. I would not suggest this except you can run it at 65 for a while and then it slows down. I would think that a map, maf, or throttle position sensor would be less likely to do this. The primary suspects would be a clogged sock/failing fuel pump/ fuel delivery problem as mentioned. Other causes would be an carbon clogged intake manifold from the egr valve or if it is a diesel a failing lift pump.

Hobo,NC · Sep 11, 2021

Hook up a scan tool set it to record. Install a fuel pressure gauge on the fuel rail record the readings when the event happens.

OK I am sure you are not tooled up to do the diagnosis. I also know how hard it is to find someone decanted enoufh to run a intermittent issue down... : ( No one wants are needs it to ruin their day...

The bad it is not a money maker the good you learn how to interpret the info available leading to the event that will turn the next one into a money maker.

I can tell you I would tape a fuel pressure gauge to the windshield it would stay there till I found the issue.

Deutz Lover · Sep 11, 2021

I forgot to ask which engine do you have? If it is a turbodiesel that has other possible problems.

racered57 · Sep 11, 2021

Because there is no code,,because nobody has found it,, I will suggest a loose baffle in the muffler or other component of the exhaust system that works it's way to block exhaust flow. Loss of power, stop, restart , loose metal falls away , power returns.
Lack of fuel sets a lean code,or fuel trim code,, any sensor out of range sets a code, trust the computer to notice what it monitors. Exhaust back pressure is not monitored on a gas motor.
Bang around on the exhaust pipe, muffler etc. and listen for a rattle. It won't be the first time this was the problem. HTH.

Geo-TH,In · Sep 11, 2021

Muffers can get blocked with rust.
Have you checked fuel pressure or fuel filter?
I had a car that couldn't get over a certain speed, fuel pump.
Tractor lost full power, bad filter.
Keep us posted what you find out...

SDE · Sep 11, 2021

My 95 Chevy truck never died, but wouldn't run a stead speed for any length of time. Remove the catalytic converter. problem solved.

ASEguy · Sep 12, 2021

Two tests need to be run first if they have not been done. Hook up a known good vacuum gauge to a manifold signal. Run the engine at 2,000 RPM for 2 minutes and see if your gauge steadily goes down. If it stays up there then you do not have an exhaust restriction that is affecting engine performance.
Second test. You need to tap into the fuel system to determine flow, not just pressure, but volume. Volume under load is best. We used to run a fuel gauge out by the driver and find a tall hill. Let me know. Email is open.

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