It is on the firewall. I had some extraneous plumbing that someone here (I think gsxr) said was a retrofit to correct cruise surging (if anyone is interested I posted the diagram in a post a few years ago). Basically it was two valves in series with some filters.

Anyway, as part of the troubleshooting I bypassed that stuff to take back to stock and as noted I removed and cleaned the tap to the intake (not a banjo bolt on the 603), the pressure line to the overboost, the overboost itself (removed and cleaned out with brake cleaner), and the line to the ALDA.

I guess it could be shifting early, although it doesn't seem to shift any differently than say a few months ago when power was fine. When I got the car four years ago shifting was terrible. Cleaning up the EGR stuff and replacing some vacuum lines & fittings really made a difference and it shifts pretty nicely now. Would that be a matter of adjusting the bowden cable?

I have not replaced the tank screen. I did replace the primary and secondary fuel filters. I run commercial B99 in the summer and B50 ish in the winter and have been for a while. About a year ago a careless attendant gave me 5 gallons of premium unleaded, which among other things is a decent solvent and cleaned up whatever the biodiesel hadn't. The problem seems unrelated to whether I have a full tank or not so I doubt there is a problem there, but it is something else to check.

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1987 300TD 231,000
#22, afterglow, plastic fan, euro lights, alternator upgrade, cluster housing update