Hello, so I have a 2001 caravan with the 3.3 and I have a hesitation and surging problem. It only does it after it is warmed up though.When you are cruising between 35-50mph steady it will "miss" and have a slight "buck" to it.Give it a little gas and it goes away. It wont do it over 60 mph or under 30 mph. Then there is a hesitation from take off. I have replaced the TPS and MAP sensors. Didn't help. I was told to replace the ignition coil and possibly the crank shaft position sensor. Does anyone have any ideas? I cant figure it out and hate it. Also where would the crank shaft senor be located?

 

Thanks to all who reply!!!! I have since the last post replaced the Crankshaft Position and the Camshaft position sensor and the ignition coil. It seemed to get a little better but it still is doing the hesitation and RPM surge with your foot on the brake and in drive and when you hit 1200 rpm it will start to surge and run rough. At about 2000 rpm it doesn't surge but runs a little rough. As stated in the previous post it still "bucks" or misses between 30-50mph while driving at a steady pace. Any help would be Fantastic. I dont know what else to change or look at. Thanks!!

 

The problem maybe a torque converter lock up problem. There a flash and the dealer would need to do that flash, If it still does it after the flash. Then you need to replace the torque converter and front pump.

 

I considered a torque converter but I can get it to do it in neutral and in park as far as the running rough situation

 

Have you looked at the wire harness on the rear of the cylinder head? Or a bad flex plate.

 

yeah I need to look at that also.... the thing is it only does it after the engine is warm nothing happens when the engine is cold... not in drive, not part not neutral

 

it will run perfectly fine when its cold then after it warms up is when I get to the hesitation issue, running rough issue, and the bucking issue....

 

The only thing you may or may not want to do is have the dealer hook up a co-pilot and record the problem when it happens. Thats up to you.

 

well here is the update. after replacing all the sensors and ignition coil , wires and plugs, it turns out it was the EGR causing my "surging" and hesitation problem. The EGR never crossed my mind because no engine light ever came on. I am posting this so others may see what my problem was. Egr had a vacuum leak. Thats why it would run fine when it was cold and after it warmed up and the egr was to open the diaphragm would leak causing my problems. Its been a long road but finally fixed. thank you to all who helped and replied!!!!!!!!

 

Thank you for giving us an update.