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  1. 2.9 won’t rev over 3000 rpm

    You’re probably right. The harness is the only thing left assuming the new parts are all good. I’ve looked at parts of the harness but will probably remove it for a thorough inspection.

  2. 2.9 won’t rev over 3000 rpm

    yes, set timing just as you described

  3. 2.9 won’t rev over 3000 rpm

    Installed new coil with no change to problem. Still begins to miss between 2500 and 3000. Now entire ignition system is new. Also removed cat and was surprised that I didn’t see any damage with all the misfiring. Gutted the cat anyway and reinstalled.

  4. 2.9 won’t rev over 3000 rpm

    I tested a used coil and it ran the same but it could be failing too. I can’t check with an oscilloscope so I might try a new coil since it is the only part in the ignition system that has not been replaced with a new part.

  5. 2.9 won’t rev over 3000 rpm

    Tfi is new but it could be bad. I drove yesterday up to 45 mph briefly and problem gets worse as engine warms up. I’m thinking that if cat was not clogged before it might be now with all the miss fires. Also it has small exhaust manifold leak. Could this allow oxygen in and affect o2 sensor...

  6. 2.9 won’t rev over 3000 rpm

  7. 2.9 won’t rev over 3000 rpm

    New ecm did not solve problem. Still starts running rough between 2500 and 3000 rpm. Will not go beyond 3000 rpm.

  8. 2.9 won’t rev over 3000 rpm

    Planning to remove cat and check for blockage in next few days. I’ll also check vacuum. Ignition seems to be dropping out momentarily based on the way the tach drops when rpm approaches 3000. Today I found 4wd not working since the ecm I installed came from 2WD truck. Since this ecm didn’t...

  9. 2.9 won’t rev over 3000 rpm

    88 2.9 4x4 auto At around 3000 rpm under no load (trans in park) develops severe miss. Tach drops and bounces at same time. Idles fairly smooth at 850. The missing or sputtering also occurs while driving. Problem started abruptly while driving a few weeks ago. Check engine light came on and code...

  10. Engine stutters at about 3K RPM

    Was this problem resolved? I have same problem on my 88 Ranger.

  11. What did you do to your Ranger today? (Part Deux!)

    Got a new Ranger. They’ve gotten larger since the 80’s.

  12. Erratic idle and wont rev up very well at all

    I’m also having the same problem. Idle is not bad but breaks up as rpm increases. Won’t go over 2000 rpm. Has no power so can’t be driven. Problem occurred suddenly while driving a few weeks ago. I’ve replaced all parts the original poster replaced.

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