1990 b230 (lh 2.4) with automatic tranny.

I really cant think of anything that I have yet to replace on the car (under hood) except the pistons and rings (105k).

She was getting a solid 25.3 mpg highway, now about 20.7 to 21 mpg highway.

Again, everything under the hood is new or recently touched by my hands except for the tranny (rear main 2 years ago) & bottom end.

She throws no codes, oil pressure good, voltage good, temp gauge (autometer) reads normal opp. temps, ALL ignition stuff is 4 months old, o2 sensor & cat. converter are 2 years old, synthetic oil (mobil one or penzoil plat. 10w30) changed every 6-7 weeks regardless, Lucas oil in rear w/ new pinion seal, tranny flush (15 qts) every 6 months, all filters are new, h2o pump new, belts new, blancer new, head new, cam new, gaskets new, get the point, and more.

I recently had the injectors done by Cruzin Performance. Car got the best mpg ever after the swap was completed.

I did adjust the kickdown cable (pretty far) but I feel she shifts really, realy great. Like a new car. Did this in the summer, she still got good mpg.

Looked for vaccum leaks cant find any. Will check again, with friend, this comming weekend.

Cam advanced 6 degrees, still got the above 25.3 highway mpg. Next week I also want to set it back to 2 degrees advanced only cause she is a too little bumpy in the morning.

Starts fine, as noted little bumpy for several minutes due to cam timing, warms up fine, runs great, pulls hard, sounds good, IAC clean, thrt. body clean, amm fine.

Super unleaded only. Change gas stations all the time. Use an adative once a month. Cleaner. Gas dry. Gas treatment. Depends on my mood.

This week, changed my summer t-stat (87d) to winter stat (92d). Flushed coolant.

Brakes dont drag (everything new). Was running 40 psi in new Hankook k106s, but dropped down to 36-37 recently. Drive shaft bearing is one year old.

Sorry for my French, but this is driving me fu*king crazy.

After my Summer head & cam swap, she is using oil too. Little more than 1/3 quart per week. There may be a link here between oil & mpg, I will pull the plugs this week for an inspection. Might just replace them for the hell of it.

Never used oil like that before head swap. My "new" machinst is the total shizzle. Very, very good. I got my valve stem seals from FCP. They were brown ones. My machinist said nothing about them. Anybody?

Car DOES NOT leak a drop of oil. All other seals are new.

Knock sensor, coolant sensor are two years old (FCP).

Could the change in gas formulation, summer to winter, have anything to do with this. But a 4-5 mpg drop?

I drive hard. Still, the car is definitely trying to tell me something.

Screw the Horse Whisperer, I need a Car Whisperer.

Was thinking about getting a new o2 sensor for good measure. With no car payment, a universal sensor is cheap to me. Dont ask me why I'd change it, haven't tested the old one.

I wanted to put a new flame trap on the car, just because, but I have no abnormal pressure.

Can anyone help me? Hate to admit it, my manly ego submits to the good people of the Board. I am stumped and need direction.

Usually, I give advice on the Board. Now, I need some.


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Enem v15 cam, adj. cam gear, new head, trans cooler, stainless brake lines, e-fan, braces, IPD sways, 100% poly bushed, Bils, boxed front & rear arms, wagon lowering springs, FWD rims, 25/32mm adapters, powder coated stuff, zero mile-d, & more