I have an 01 ranger with a 2.5 l engine. Got it back from my niece. Said they were driving down the road timing belt broke. They replaced timing belt. Said after replacing timing belt still was not right. I've been a mechanic for 41 years. So I get it and I figure timing is out he didn't get it right. Cranks up and idles fine. Rev the motor up it goes to missing and let off and it dies. Go to crank it back up immediately. Acts like no compression. Wait 10 to 15 seconds starts right back up with no problem. But as soon as you give it gas and Revit and let off it dies same issue. So I checked timing belt it is off two notches. I put it back in time. Double checked my work rotated engine it is definitely in time. Still same issue. Any suggestions on what could be going on would be greatly appreciated. I'm down to wondering if not a bad timing belt. Runs fine at all but when you give it gas and rev it up the belt stretches. And when it dies it sits for a second the belt goes back and let it run good again. That is just my thoughts.

 

It also reads like clogged exhaust, same symptoms

Also low fuel pressure could account for those symptoms, dirty fuel filter or weak pump

It would be a remarkable coincidence of having broken timing belt and clogged exhaust or low pressure, but it would have to happen to someone sometime, lol, i.e. 1 in a Million, lucky you

Belt tensioner needs to be tight not just snug, tight, it will still self adjust

 

Yeah I would have been checking all that but all that stuff does not explain the compression loss. Because I've dealt with the clogged exhaust in weeks fuel pump low fuel pressure before so I see that right there but again that don't explain the compression loss. That's what's puzzling me.

 

Yeah I would have been checking all that but all that stuff does not explain the compression loss. Because I've dealt with the clogged exhaust in weak fuel pump low fuel pressure before so I see that right there but again that don't explain the compression loss. That's what's puzzling me.

 

Sorry, I misunderstood, I didn't know you had tested the compression, and found it low and then high again
I thought you just had the impression it was low and then high because of the way it was running

Can't think of anything in the belt setup that could cause that, a woodruff key could shear off but that wouldn't explain a return to good compression on its own

If its a "new" tensioner then it could be defective
"new" no long means "it works"
"new" means NEVER EVER TESTED, and has a warranty so you can test it and return it if it doesn't work, lol

 

Did not even think about the tensioner being bad. I will have to check that out thank you very much sir