Hey Mechanics--problem here.

Discussion in 'Random Thoughts' started by scratcho, Aug 28, 2013.

  1. scratcho

    scratcho Lifetime Supporter Lifetime Supporter

    Son's band just bought a '94 Dodge van, 250. Just driving along--it loses power. He said it goes along fine, then it loses power and the throttle won't respond and it loses enough power to have to pull over. It does it on an intermitant basis. He'll push the accelerator down--nothing--then it'll take off like it's supposed to. (I was just talking to him while he was driving it and he said it's going fine. This is intermitant.

    They had another Dodge van that did the same thing , but they never figured it out. Any ideas?

    Maybe a filter in the gas tank?
     
  2. Gongshaman

    Gongshaman Modus Lascivious

    Vacuum leak maybe? hard to check all the vacuum lines on those, kinda tight under the hood probably huh
    Could be intermittent because sometimes cracked hose seals up just enough, sometimes it don't.
     
  3. SpacemanSpiff

    SpacemanSpiff Visitor

    bad fuel pump or gas cap would be my first guess
     
  4. scratcho

    scratcho Lifetime Supporter Lifetime Supporter

    Alright. I'll call him now and ask him to check. I didn't find out from him whether it's carbed or FI.


    (aww--he's doing something else right now, so I still don't know the gas-feed situation)
     
  5. scratcho

    scratcho Lifetime Supporter Lifetime Supporter

    Gas cap??? Would that do something??
     
  6. Kinky Ramona

    Kinky Ramona Back by popular demand!

    Oh yeah, a bad gas cap really can make a difference. Can't get good pressure if the gas cap isn't sealing.
     
  7. MeAgain

    MeAgain Dazed and Confused Staff Member Super Moderator

    Sounds like a fuel problem. Maybe dirt somewhere, there maybe a fuel filter up at the engine, somewhere in the fuel line along the frame, or part of the fuel pump in the fuel tank. Maybe more than one filter.

    The fuel pump may be over heating and then the computer shuts the engine down.

    Try turning the key on off, on off, on; without starting the engine and see if it will generate a trouble code by counting how many times the check engine light blinks. Final code is 55, end of diagnostic.
    If it generates a code look up Dodge OBD1 fault codes on the net. If no code is generated then check the fuel system, you can get a pressure check to see if it is functioning correctly. I don't know what that costs.Or just replace filters, then the pump if all else fails.

    A parts store may be able to run a free diagnostic, but I don't think a 94 has an outlet they can plug into. I don't think a 94 has a carburetor. Probably fuel injected so that's out.

    Look on the net, try the AllPar site which is a bunch of MoPar motorheads. There is a forum on there somewhere for tech advise.
     
  8. scratcho

    scratcho Lifetime Supporter Lifetime Supporter

    OK. Thanks KR. I'll take you and BBs advice and tell him.
     
  9. scratcho

    scratcho Lifetime Supporter Lifetime Supporter

    So will a trouble code show up someplace to be seen? Or does it take some kind of computer check instrument? And thanks.
     
  10. rollingalong

    rollingalong Banned

    everyone is speculating on the van....I was gonna go another route and blame the kid.. ...is there any way you could just disown him?....could save lots of headaches:)
     
  11. scratcho

    scratcho Lifetime Supporter Lifetime Supporter

    Did you say a fuel pump in the gas tank?? What the??
     
  12. MeAgain

    MeAgain Dazed and Confused Staff Member Super Moderator

    For that year, if it has one, the check engine light will blink...I think.

    Check out the AllpPar site.
     
  13. scratcho

    scratcho Lifetime Supporter Lifetime Supporter

    Be easier to disown the van. These dodges(of which they have had a few) seem to get the same problem. He said they put $$$$$$ in the last one--still did it. Maybe they should just take it somewhere, but it's so damn expensive nowadays.
     
  14. MeAgain

    MeAgain Dazed and Confused Staff Member Super Moderator

    Newer fuel pumps are electric and in the gas tank. No more mechanical pumps.

    You have to drop the tank to get to an access panel on top of the tank, or cut a hole in the floor, which I've done, and then seal it back up real good when you're done.
     
  15. deviate

    deviate Senior Member

    A gas cap wouldn't cause that, only thing that's going to affect is evaporative emissions and a bad fuel pump if it's leaking down would cause extended cranking time or wouldn't start at all. Doesn't sound fuel related to me, more on the engine control side of things.

    Sounds like a bad tps or crank sensor, in other words an electronic component. More than likely tps, it's a potentiometer (variable resistance like a fuel gauge sending unit) and can cause all kinds of intermittent issues. Also could be a pcm. All three of those parts are common issues with chryslers. A bad map sensor can also cause that. I don't believe that's a maf system, so it should have a map.

    You don't need a scan tool to check codes, that's OBD1. You should be able to ground a pin on the diagnostic connector and watch the check engine light flashes. I can look it up if you want, I have prodemand on my laptop. Is it the 5.2?
     
  16. scratcho

    scratcho Lifetime Supporter Lifetime Supporter

    Thanks meagain. VERY good information. My take is that he can read the info on this site and get'er fixed. The site covered a lot of little,cheap fixes that would/could preclude a major expense. I always figured that if a problem comes up--go to the cheapest possible fix first and work up from there.
     
  17. deviate

    deviate Senior Member

    Also could be a ground/voltage drop issue, which is always fun to diagnose.

    I'd check the battery terminals first. Make sure they are tight and not super corroded. Also you can go by autozone or something and make sure the charging system is in good shape. Excess diode ripple in the alt spits out ac voltage which can wreak havoc. It's a free check at places like that.

    Edit: Since it's intermittent and you don't have the equipment (you really need an oscilloscope to see if and when a sensor is dropping out).. it wouldn't be too expensive to clean the throttle plate and throw on a new tps. They are probably $20. There's a good chance that will fix it based on what you are saying. But then again those things have issues with the governer pressure solenoid and switch in the valve body of the trans too, haha. But that doesn't sound likely from what you are saying. That usually makes it start out in 2nd gear.
     
  18. scratcho

    scratcho Lifetime Supporter Lifetime Supporter

    Deviate---that site Meagain recommended mentions the things you mentioned--crank sensor--map--etc. 5.2, as in liter?
     
  19. scratcho

    scratcho Lifetime Supporter Lifetime Supporter

    Damn---there's a lot to consider!! I think I'll tell him to take it to one of the auto part stores,as you mentioned and have them put it on the ---whatever that machine is. I think one of you indicated that it's computerized --1994?
     
  20. deviate

    deviate Senior Member

    Yeah, 5.2 liter 318 cubic inch.
     

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