01 Ranger 4.0 SOHC - No Power - even after timing chain replacement
Have a Ranger with 4.0 and 75,000 miles.
Suddenly lost power while driving. Could barely get up even the slightest grade. No codes. No engine light. Had a strong rattle noise and very low compression readings - less than 50 psi. From these forums learned that this was likely a timing chain issue.
Pulled the engine, bought the special tools, pulled the heads, found a broken right side cassette, had a machine shop replace the bent valves.
Very carefully followed the shop manual and these forums while I replaced both cassettes and the front timing chain and tensioner. Did a differential compression test on the stand and everything looked good.
Put the engine back in, fired it up and it still had no power. Again no codes. No engine light.
Checked fuel pressure. That is in spec. Checked coil output - all good.
Only abnormal indications is that a conventional compression gauge shows 150 psi on Cylinders 4 & 5 while cylinders 1&2 show only 100 psi at idle. Just to make things more interesting, a differential compression test on 1&2 looks very good 48 out of 50 psi.
Is there anyone out there with any ideas? Thanks in advance.