dodge caravan

I have a 1990 dodge caravan that I use to run around the city in my repair business.It has always been a good running,ecomincial get around.But here as of late it has lost power or something.IF I go above 40 miles an hour or try to pull an incline it will spitt and sputter and almost die out.If I'm on level ground and stay below 40 miles an hour it runs smooth with no problems,just when I excellerate or try to power up a hill.Does anyone know what is happening?What can I check out,or look for?I've already put in new plugs,no help.

 

Check and replace your fuel filter for starters. If that has no help, then your fuel pump maybe going south.

 

Thank you for the reply.I'll get a fuel filter tomorrow and change it out and hopefully that will do it.Thank you again for your time.

 

Spark plug wires and distributor cap are also high maintenance items.
Open the hood where it is dark like at night in a garage. Some where it is real dark and look close at the spark plug wires. If you can see some of them glow at parts then it is time to change them.

 

Ok I got a new fuel filter and put it on,still doing the same thing.I have already changed the plugs,wires,and distributor cap.One thing I've noticed is that it runs fine for about the first hour each time it is taken out, then it starts to miss,spit,and flutter like it's lost it's power.

 

Whent out this morning,and as I've said ,everything alright for about the first hour,then it acts like it's lost it's power or get up.The only thing that I've not done is to check the fuel pump,because I can't find it.The fuel lines come from under the vehicle and go into either a carburator or fuel injector.Does anyone know where the fuel pump is and how to check it?Also anything else that I need to check out to see if I can get this old thing going?

 

I think what you are saying is that the vehicle will start and run AOK when cold and then later on after a hour or so has passed then the vehicle will run fine at below 40 mph or at idle and mild acceleration.
It will act up after an hour when trying to go over 40 mph or when going up a hill or accelerating.
Could it be gas pedal oriented?
The "Throttle Position Sensor" could be gone.
It is an electronic devise so it could be fine when cold then act up after it gets hot.

Try to take it for a drive and decide whether there is a magic spot where if you have to step on the gas harder, it acts up.

That is a place I would look
I left a link you can follow to test it

http://www.geocities.com/motorcity/d.../dsmtests.html

I would think that if it was the fuel pump it would do it intermittent or all the time. It sounds to me that you are describing something that is dependant on how hard you step on the gas.
I could be wrong or I could have to conditions wrong though.

 

Thanks for your reply.Yes basically that's what is happening.I'm going to check out the very good info that you sent.Thanks again

 

another thing you might won't to check is the exhaust convertor.it could be plugged up.after you problem starts pull over and check the convertor and pipe going into it.if it is cherry red change your convertor

 

After checking everything out,I finally took this thing to the mechanic shop,and after hooking it up to a diagonistic tester the problem turned out to be the fuel pump,now it runs good.I want to thank you guys for all the good info and advice.Thanks for your time.