I recently purchased a project 2000 Ranger with the 4.0 OHV engine. It has an odd problem that seems to be an extreme backfire through the intake plenum associated with cylinder number 1 - if I pull the plug wire, the backfire (loud pop or knock) stops. No other cylinders have the same effect. Compression test on cylinder 1 is good, so I am thinking it's not a valve, head or headgasket issue?
Oddly enough, I found this YouTube video showing the EXACT same symptom but no additional information:
I am stumped, any suggestion greatly appreciated! This is my first Ranger and my first post, although I have wrenched on British cars for many years. Looking forward to actively participating!