Bucking in any gear , Coil ? swaped engines

S

Sisco Kid

New Member
I have a 97 Ranger had everything replaced , used 4.0 v6 2wd , only thing original is wiring harness and ECU , bought new coil swaped still bucking at 2.5-3000 RPM. Has anyone had this problem ?

I am new to the forum, not new to Rangers had many never this problem , I replaced engine now at a loss for words.It has to be electrical but different engine and same problem is strange.
 
Same problem, used engine , diff coil, new fuel filter, new wires and plugs, new fuel pump and fuel sensor. Any help plz
 
I had the same situation, bad coil pack and plugs so other than that I would take a shot in the dark and say EGR maybe but I'm stumped!
 
New EGR , I am waiting for a code , last was crank shaft pos sensor.. read that was false code..ECU learing. I am going to switch out wiring harness then tackle ECU , how much does dealership charge remap or update on ECU
 
Sisco Kid said:
New EGR , I am waiting for a code , last was crank shaft pos sensor.. read that was false code..ECU learing. I am going to switch out wiring harness then tackle ECU , how much does dealership charge remap or update on ECU
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Have a dealer look at it, hopefully you know someone that can look for free. Any codes coming up?
 
If I end up having to go the the dealership I will only have them update the maps on the ECU thats it. I have been driving for 400 miles and it does it every other day sometimes it bucks the whole way and other times it is every now and then. Damn pain in the ass. I am going to get the wiringing harness off the other engine that was bad maybe that with fix it.
 
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