What Neil said - the compression test is just for checking cylinder health. Won't give you any clues on the valve stem seals but sounds like you have a handle on them already. Will only tell you about valves if one is really bad - you'd know already.

Warmer engine is better but you can do both and compare. It may give you a read on the piston ring condition or bore wear. Argument for not doing when engine is cold is engine is harder to turn over and may not give consistent results

Neil

So I wanted to close out this thread with what ended up being the problem. After spending way way too much time going down different rabbit holes with no success, I threw in the towel and took the car in to a indy shop for diagnosis. The mechanic drove it with both ECU's and couldn't really explain ...

Thanks Misha

You are close enough that you can turn that crank without worrying about valve contact

Mine is prewired for D-pillar speakers and speaker wiring are connected with cd-player....tried it and speakers work but i have a problem to find original speakers with their original mountings to fit them. Speakers from '99 will work fine in your 850. Thanks! I got the speakers, it was very easy t...

Pulled the Walbro out before giving it the two fingered salute, and stuck a Bosch in. All works perfectly now, nice to see Made in the USA still carries the same heft it used to. It is borderline infuriating that I spent a over a week of evenings trialing everything bar the pump, only to find out it...

I don't know which is which i.e. who us wrong, but I can tell you the key is the shape of the ports on the IM. If your manifold has the little notch at the top of each port, get 9146266. If the ports are smooth with no notch then you want 1275055. You can tell by just opening the hood and looking in...

Which one is for '97 850 B5254S M4.4 without EGR and WITH SAS? Fcp says that: -9146266 is for engines WITH EGR -1275055 for engines WITHOUT EGR Skandix says: -9146266 for engines WITHOUT EGR -1275055 for engines WITH EGR :roll: Ipd includes BOTH types in their PCV kit :!: All others....says 9146266...

The 1275055 parts is 1993-1995 with emission code 0