[karmutzen]

210,000 miles, mileage dropped to 14-15 mpg. Changed plugs, air filter. Not throwing any codes. Today I changed the two upstream 02 sensors. We'll see what happens.

 

[BruceX5RL]

Time for compression tests, if ok, walnut blasting to clean the internals. New rings, all new tubing associated with the engine, other small items.

 

[eurban]

Time for compression tests, if ok, walnut blasting to clean the internals. New rings, all new tubing associated with the engine, other small items.

How about slowing down and testing a few other things first?? Valve adjustment? Brakes dragging? (calipers float on pins that are notorious for seizing up and may cause dragging). Tire condition and inflation? Are there any codes??

 

[fdeno]

How about slowing down and testing a few other things first?? Valve adjustment? Brakes dragging? (calipers float on pins that are notorious for seizing up and may cause dragging). Tire condition and inflation? Are there any codes??

Correct - eliminate the obvious and then get a baseline..did the mileage drop suddenly or over a time period ? Have you cleaned the induction system ? Have you taken "live" ODBC readings with a product like the Blue Driver scanner to look for anomalies in fuel distribution/use ?

 

[karmutzen]

No codes, did some basic OBDC scanning, nothing obvious. Valves adjusted a couple thousand miles ago along with new plugs and air filter. Brakes dragging eh? Cleaned and lubed the front caliper pins last year (they were kinda seized). Today checked the hubs with a thermoreader and the right side is running hot. Pulled the wheel and caliper, pins were good but pads were jamming up on the carrier and had uneven wear. (Sigh) so over to RockAuto for Z36 rotors and pads. I'll put those in on the weekend.