Strange problem.

[Morganick]

I made this account specifically to see if anybody could help me in solving an issue I'm having. There's nothing I could find using the search function so I thought I'd create a new thread.

I've had had a problem with my Ram for two years or so now, and it's fairly odd. While driving if I take my foot off of the gas it dies, but that's not all. Sometimes it doesn't die, sometimes it does. Sometimes as soon as I start the truck unless I put my foot on the gas it dies. Then once I've thrown it into park the RPMs while lower and raise back up (sometimes).

This has lead to me having to drive with two feet, because if my RPMs go low enough it dies. Now, my family has thrown a lot of time and money into solving this problem. The check engine light DOES NOT come on. We had the transmission rebuilt recently as well, and there's roughly 140k miles on the rest of the truck and I believe it's a 94? I can't recall right now.

Every time we take it to the shop they'll give it a tune-up and change plugs and wires and so-on, and the problem will go away for a day or two and while driving the RPMs will drop and the truck will die almost causing an accident. We've recently had an acceleration tube cleaned? I'm not a mechanic and not entirely sure the name of the tube but the mechanic ( a family friend ) said that it was so gunked up that he was surprised it ran at all. Sure enough for the first few days it ran well then suddenly started dying.

-On a side note, if I rev up the engine and floor it the truck won't die for awhile. As well as the RPMs don't move to often while I'm driving it. They seem to pretty much stay in the same spot despite me accelerating unless I've slammed the petal to the ground.

TL;DR My truck dies when I take my foot off of the gas and nothing has permanently fixed the problem

 

[Trupiano]

Im certain we can find the problem for you, and even more certain the problem is probably a cheap sensor or probe reading wrong or plugged.

What year is the truck? Im on Tapatalk so I can't see your year.

El phono

 

[Trupiano]

Also... Does it do it as soon as you start the truck/open loop? Or not until it's warmed up/closed loop?

El phono

 

[Morganick]

I'm fairly certain it's a 94. Honestly it varies. Sometimes it will die as soon as I start the trucks, other times it won't die until after I've driven it for a few blocks.

What I mostly don't understand is why a check engine light isn't coming on. One time it did and we plugged in to check what it was and it was some sort of acceleration sensor and we had it replaced but the problem still persisted.

 

[DukeCity]

It may be the throttle body and the sensors needing a cleaning I think there may be a how to on how to do it.

 

[Morganick]

Okay I'll have to give that a try.

My main concern would be some sort of a fuel filter problem; seeing as how when I accelerate fairly quickly it won't die right away

 

[Morganick]

And the throttle motor has been replaced

 

[Trupiano]

First thing I would recommend, would be to clean everything.

Clean:

Throttle body (not with cleaner, as it will damage the sensor)

Any and all sensors you can find, like the throttle position sensor and EGR valve

Run seafoam through the engine, Just take the vacuum line off the brake booster and either pour some seafoam or just stick the hose in the bottle and let it suck about half of it out while the engine is running. Carbon build up may be a problem in the engine, and at lower RPM's make it "stall"... Also it wouldnt hurt to take some seafoam and run it through the crankcase before an oil change (about within 100 miles of needing one)... Also pour some in the tank to help clean those injectors if they're dirty.

 

[Trupiano]

Once that's done, lets check out the fuel system, as it sounds like it might be not enough fuel getting to where it needs.

Check your fuel filter as that's a good place to start. It's either losing spark, or fuel when it dies.

Also, check your EGR valve and make sure it's not clogged and gunked up.

Here's a guide with some of the sensors that I've been working on. Not all of them will apply to you as you have a second Gen, but still might help.

http://www.ramforum.com/f54/engine_tranny_systems_sensor_info_troubleshooting_guide-18583/

 

[Morganick]

Thanks so very much for the responses. Hopefully once all of this is done it shouldn't be a problem anymore and I won't have to post another thread! Thanks again!