Question about Dodge W150

2 Answers

1986 Dodge W150 with 5.9L(360) (105,000 miles on it)runs ok cold but starts to run bad once it warms up under load(regular driving). I'll be driving along and stomp the gas and the truck will fall flat on its face(works better if you ease the gas pedal down)! The only way I can keep it running after the problem starts is to pump the gas pedal. I have a new carb on it, new plugs, coil(MSD), wires(MSD 8.5MM), air filter(wide open). only the dist and cap and bal. resister have not been replaced. there is no smog or cat.converter on this truck. also the air cond. was removed as it is used as a farm truck. the Fuel filter and Fuel pump have also been replaced not long ago... It is at the local garage here and the guy has no idea what is wrong with it. The truck use to run very very stong and it started this after a long trip(3hrs). the problem is worse if you are in a head wind or pulling a boat(under load). the trans slips a little but not bad.

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  • ed209clark Jul 22, 2008

    local guy here(dirt track racer) has setup the carb and both Fuel filters have been replaced in the past month or so. Thanks for the help. Ed

  • ed209clark Jul 22, 2008

    yes he did a compression check, timing check, fuel pressure check as well. only thing they have not tried is a fuel volume check and that maybe a shot in the dark.it runs cool and the Rad. is new as well and fluid levels are steady.

  • ed209clark Jul 22, 2008

    It really doesn't burn any oil at all. I did run some ring free through it and replace the oil afterwards, but that was quite a while ago before the new carb. thanks again!

  • ed209clark Jul 22, 2008

    compression check was good, I will ask him about the head Gasket. maybe time to buy a rebuild engine and start from scratch, any ideas on where to go for a good rebuilt motor? I'd hate to do it but... its cheaper than a new truck!



  • ed209clark Jul 22, 2008

    good point I'll buy a new dist and cap to take that out of the equation! I can reuse them if I need to get a new motor anyway

  • ed209clark Jul 22, 2008

    ok I'll change the dist/cap/rotor and keep ya posted! Thanks!!! Ed

  • ed209clark Jul 30, 2008

    update 7-30-08 Truck is still running like crapola! we change the Ballast resistor, Cap Rotor, and Ignition Module. The truck will not idel at all and back fires when you let off the gas(it runs better after it back fires if that means anything). I checked the truck running with the fuel cap on and off to check for vapor lock as well(no diff either way). This truck use to run balls out and has been acting like this since I drove it a long way pulling a boat.(loss of power, rough running). It use to be worse when it got hot but it runs like **** all the time now(some of the changes have effected the problem but not corrected it). I'm leaning towards a fuel supply problem and pos. a timing issue as well?? any ideas guys? I took the truck to another shop here where the guys are old school and they seem to think the truck is not gettting enough fuel... I'll let you know more when I hear back from them... at wits end

  • ed209clark Jul 30, 2008

    I think we are pretty close to a solution. If the experts here can't figure out the solution then I might have to do that. its my last shot before replacing the motor. the compression checks have been good, I think the other guys were just parts replacers and didnt know how to work on carb. motors. these guys have 30+ years in the industry. I should know more in a day or two. Thank you so much for your help! Ed

  • ed209clark Jul 30, 2008

    Thank you! we are looking at that now(carb) + timing + fuel supply, it bucks, sputters, back fires and will start to take off if you pump the gas pedal

  • Anonymous Mar 12, 2014

    runs as along as you keep the gas pedal down just replaced the fuel pump and fuel filter

  • Anonymous Mar 27, 2014

    when you put under a load it has no power above 1000 rpms.it cuts out.Pulling hill empty it does this.Just put new fuel filter in today.Have no way to read code

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  • Master
  • 2,028 Answers

Falling on it's face is almost always too much gas versus spark. You're going to find that your timing is off, or the carb isn't right. On these motors there's not much else that can cause it to fall out like that.

Posted on Jul 30, 2008

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  • Ryan Rogers
    Ryan Rogers Jul 30, 2008

    Also, double check the msd, I've had a few that would drop the spark at certain rpm's, under a load, or accellerating. Mostly due to a wiring problem, but one had a bad gear on it (the small brass gear at the end of the shaft)

  • Ryan Rogers
    Ryan Rogers Aug 02, 2008

    Did it turn out to be the carb?

  • Ryan Rogers
    Ryan Rogers Aug 06, 2008

    Just wondering if you found the problem?

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  • Dodge Master
  • 19,396 Answers

Check the air intakes and hoses, more likely you will have to setup the carburator
Also check the fuel filter.

Posted on Jul 22, 2008

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  • Ginko
    Ginko Jul 22, 2008

    Check also that the truck is not jest losing compression because of head gasket strarting to go, did the guys at the garage check compression and head gasket?
    Does you need to top up coolant liquid from time to time?


  • Ginko
    Ginko Jul 22, 2008

    As the truck has been recently in a garage carburetor should be fine, check that the truck is not consuming oil and water, it isn't a very recent car, and the engine may be starting to go.

  • Ginko
    Ginko Jul 22, 2008

    the overall looks like the engine has not enough compression.

    It can be ring wear or cylinfder wear, it may
    happen after years of hard service. The clearences get too wide,
    compression is blown into the crankcase.
    Or it can be head gasket blown, this happens after years of use or happens when the engine runs too hot. The cause of this is the head bolts relaxing.





  • Ginko
    Ginko Jul 22, 2008

    If oil and water are always ok, and they tested compression must be some stupid thing. A distributor rotor that fails when engine is hot on one cylinder or other wird staff like this.
    If you cannot find problems in fuel, check distribution, the car does not even have electronic injectionor other computer controlled stuff that can create this problem.

  • Ginko
    Ginko Jul 22, 2008
  • Ginko
    Ginko Jul 22, 2008
  • Ginko
    Ginko Jul 22, 2008

    and is not an expensive part either.
    Regarding the engine, if you do not find enything cheaper locally (a good tested engine from a trusted scrapyard) I suggest buying from automotix.



  • Ginko
    Ginko Jul 30, 2008

    Well I thought you were replacing the whole engine, if it is like this is not worth spending more money on an engine that may have problems with cylinders etc.

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