North American Turbocoupe Organization

I recently purchased a 1988 Turbocoupe. It has about 94k miles. It had several oil leaks which I have mostly fixed (oil pan, valve cover & transmission pan gaskets). I also replaced the oil pump, EGR valve, wires & plugs and air filter. However, it has only been getting about 9-10 mpg in mostly city driving. Other posts that I have read usually get about twice that. What are some of the possible causes of this and where do I go from here?
P.S. - It also idles rough, though it doesn't stall. Driven real easy.
Thanks for all the input, will try ASAP.

Jim, Welcome to the board.
Pull the vacuum line off the fuel pressure regulator and see if there is gas or the strong smeall of gas in the line. If the smell is faint, then run the fuel system diagnostics:
http://www.turbotbird.com/techinfo/Fuel_...ostics.htm

Have you pulled the codes yet?
http://www.turbotbird.com/techinfo/Retri..._codes.htm
http://www.turbotbird.com/techinfo/In_Ca...rCodes.htm
Let us know what you get in each phase of the test.

Did you use the Motorcraft EV-127-A valve, Ford P/N: E5ZZ-6A666-A. Other brands do not keep boost out of the crankcase which can cause leaking gaskets.

Is the CEL on? If running rich enough to get that horrible mileage, it should be on. If it isnt, are you sure the CEL even works? Common for the PO to pull the bulb out if it is on when trying to sell it.

I assume you have an auto tranny?? If so, here some possibilities:

Brakes dragging. Common for the rears to get hung up (frozen caliper pins) of siezed park brake cables keeping rears on.

Is the tranny going into OD?

Bad 02 sensor or orange 02 ground wire at turbo inlet disconnected (this should turn on the CEL)

Is all your driving very short trip on cold weather? Long warm ups? That kills mileage.

Is the engine getting to operating temp?

Are you driving it like you stole it?

By the way,
PO means Previous Owner
CEL means Check Engine Light.
O2 means oxygen

When having "fun" my TC will definately drop into the low teens on MPG. A highway run will definately give you a more accurate idea of fuel comsumption.

If you are driving it "normal" and returning that type of mileage, then there is definately amiss...

A good checkup on any newly acquired TC is to:

1. Pull Codes and fix any problems
2. Make sure tranny is locking and going into OD
3. Check FP (AZ rents the tool. It's EASY to do 39psi @ idle)
4. Check for boost/vac leaks
5. Set base idle (800rpm, warm engine, IAC disconnected)
6. Check TPS voltage (.96V @ idle)
7. Check timing (10-12* spout out)
8. If original, replace HEGO sensor (O2 sensor)

I have done all but #8 on my '85, and everything FAILED except #1,2,and 7

Good luck, and keep us posted

-Shane