Stumped!

[Seth]

My 1995 Ranger XLT, 3.0L, 2WD has picked up a significant stumble at what seems to be at a specific RPM range. Runs great up to reaching and after passing this RPM range. I don't have a tach but it happens at 10-12 MPH in first, 22-25 in second, 33-36 in third gear and so on. If I continue to accelerate it smoothes out. If I stay within the specific RPM range it starts lurching like I don't have enough RPMs for the gear I'm in. I recently changed the cam syncronizer and sensor, DPFE, thermostat and tepmerature sensor and the truck has been running great. Today I changed the coil pack and wires and put on a new EGR valve but made no difference. Had a P1443 OBD II code that is why I changed out the EGR valve. I cleared the code and it has not returned. Any thoughts? I appreciate any help with this.

Thanks Seth

 

[strvger]

fuel filter?? may be something in there just heavy enough to respond to a specific fuel flow @ rpm.
just a thought.

oh, and Welcome to TRS !!!

.

 

[LearjetMinako]

If my memory serves me right, the P1443 code has nothing to do with the EGR. It is for the Evap canister purge control valve.

Did this problem occur before you replaced all those parts or after?

 

[Seth]

It started about 4 weeks after replacing the Cam position syncro and the DPFE. The Cam syncro destroyed itself and a week after i replaced it the engine stopped running altogether. Code indicated a temp sensing issue so I replaced the thermostat and the temp sensor. Ran great for about 3 weeks then this.

Thanks

 

[Seth]

First I want to thank everyone for your help. Now for the hard part. As it turns out the cam syncro bolt had come loose and the syncro turned until the electrical plug socket was hard against the block. Boy do I feel Stoooopid! Thanks Again!