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My thermostat has the hole in it and I specifically put the hole at the 12 o'clock position. There's actually a cut out in the hole in the intake at the 12 o'clock position for the hole in the thermostat. I'm gonna put that same thermostat in some boiling water tomorrow to make sure it is...

I figured it out - I think. It has nothing to do with oil viscosity. I had air still in the engine. Drove it 40 miles last night at highway speed to see what would happen and when I stopped to listen to the engine, it sounded like an engine on it's last leg from over heating. We all know that...

I just pulled the wires and no change. BUT - I added some honey oil and the noise got quieter. I think 5w20/30 is too thin for this engine. I'm gonna change it out to 10w30 and go from there. I'll report back with my findings. Thanks so much ETA: Laughing my ass of about Pacman. I think it...

Done did. Not the belt. I've put a scope on it and it sounds like it's coming from the bottom end. The chirp is in tune with the RPM's of the engine. But goes away after idle. It just sits there - chirp, chirp, chirp, chirp, chirp. I used 5w30 with Lucas break in additive. Wondering if 5w30 is...

MODS - can you move this to the 4.0 forum please?

1994 Ranger 4.0 OHV. It literally sounds like pac man. The high pitch chirp chirp chirp chirp pac man makes when he's going around the board. Rod? Main? Anyone have any ideas? I think it's a rod bearing. Thanks

Dunno! I'm f'ing stumped. KOEO code 111 and then CM code 157. What I've done: Continuity check all wires and connectors - OK Replace MAF - OK Replace ECM - OK Replaced IAC - OK Replaced ECT - OK Replaced TPS - OK Everything tests OK.. The truck runs rough after idling down upon first...