Question about 1990 Plymouth Voyager

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1990 Plymouth Voyager Minivan 2.5L 3 speed auto trany. Starts fine and runs fine when cold. But after about a half hour of driving and the engine heats up the trouble starts. The engine acts like it is cutting out but not all the way where it stalls. It bucks and chugs. Like only a few cyclinders are firing. I stop and stand on the brake and give it gas while in gear and it stumbles. I put it in park and give it gas and it revs just fine not missing a beat. I thought maybe it was getting too hot and the fan was not kicking on or the idiot light. I checked the Rad fan by giving Direct current and it worked fine. Even though I never hear or seen the thing run before. I want to check the relay but don't know which one is the fan Relay? Anyone know? I am guessing at this point it could be a number of things and I am trying to cross some of the list. Could it be the Raditor and Tranny cooler? The tranny cooler being old maybe getting tranny too hot? Shift Solenoid in Tranny when heating up malfunctions? The pick up under distributer? But why only under load and hot? Coil? same question? Cranksensor? Same question, why under load and hot but not under load and hot? Maybe I will just change the rad and see what happens. I have a newer one sitting in Garage I can just drop in. Any suggestions would be great. Thanks Rick

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  • Rick T May 02, 2010

    My first thought was the crank sensor but the engine would run fine when in park and not under load when hot.

    It wouldn't miss a beat when reved up.

    As soon as I Put it in Drive and stand on the brake and rev it up it acts up.

    I have a radiator for it in My garage so I can swap it out no problem.

    This one came from a van I scrapped out and was fairly new.

    I will try switching it and let you know what happened.

    Any idea which one of the relays is the fan relay on that Van?

    That would be helpfull.





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I think your on the right track but I would start with the CPS (crank position sensor) as it seems most obvious as it normally starts to fail/read inaccuratly when the car gets hot. Should be less then $40 and a much easier replacement then a radiator. You also can invest in a trans cooler or trans temp sensor if the tranny is getting hot but I wouldn't think that was your issue. If its overheating the coolant would normally be boiling in the overflow bottle when the motor is shut off but if you suspect overheating check the coolant mixture and insure you have a 50/50 mix and not straight coolant..

Posted on May 02, 2010

  • James Brooks
    James Brooks May 02, 2010

    there are normally 2 relays, one is usually the blower and the other is the fan relay. Your fuse cover should have them labeled and if not your manual has them in the fuse area. If it's bucking in gear try changing your trans fluid and screen. Its possible the screen has become clogged and is causing issues with shifting smoothness. Also if worse comes to worse your torque converter could be bad but that also requires good clean fluid as well. If you can run some trans cleaner in it for about 25-50 miles before your drain the pan...



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