BMW 2002 FAQ - horrible milage (warm up transmittor?)

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Thread Topic: horrible milage (warm up transmittor?)

Date: 3-26-08 09:04
From: fiftytakedowns in San Rafael

Subject: horrible milage (warm up transmittor?)

Just fixed odometer, and was stunned with results of first fillup

I only got about 150 miles on a fillup (about 12 miles a gallon) ,
this was after I did timing, and checked valves (only one valve was a little too tight).

I was pretty curious about the mixture after examining my plugs (displayed a rich mixture) so I looked at the Injector.

I Drove the car down the highway around etcc... to let it warm up fully after doing valves. I found that it was hard to measure the warm up regulator with a ruler , but realized that a popsicle stick is exactly 10mm (fit exactly into a 10mm wrench). then I measured away as car remained on. the car was warmed up and it was only up likje 3/4ths the way.

what could the result of the bad mileage be, or am I on the right track?
_________________
1974 tii "Mr. T"

Date: 3-26-08 11:28
From: JerryC in Santa Rosa, CA

Subject: Re: horrible milage (warm up transmittor?)

Could be the cold start injector is leaking or not shutting off. Pull the air cleaner and watch the cold start injector in the throttle body. Dab a paper towel on it with the engine running and warmed up. If it gets wet, it's not shutting off completely.

The tii injection repair manual is downloadable at the tiiregister website:

http://www.thetiiregister.com/phpmyfaq/index.php?sid=188544&lang=en&action=artikel&cat=220444&id=14&artlang=en
_________________
Jerry

Date: 3-27-08 06:13
From: mattmcginn in West Hartford CT

Subject: Re: horrible milage (warm up transmittor?)

I had a 74 tii in the shop a few years ago that had the same symptoms. After some serious time trying to figure it out, via checking the warmup regulator, etc, it turned out that the "zeitschalter"-the timer box that tells the cold start when/how long to fire had a diode that had come unsoldered that was causing it to fire intermittently when the car was running -so check that when the car is running the cold start is/is not firing.

You can do this by removing the boot between the throttle and air filter and looking at the throttle plate. If it is firing when the car is runnin, or will fire if you move the zeitschalter then remove the zeitschalter-I have some pix somewhere of the repair procedure that if I can find I will post, but this may get you pointed in the right direction.
_________________
Matt McGinn
Sports Car Restoration
www.sports-car-restoration.com
1974 2002 turbo 4290909, resto project, looking for parts
89 M50'd e30
72 Alfa GT Veloce
84 M491 911
68 1600 channeled and flared project
70 2002 flared car project

Date: 3-27-08 06:57 From: lilmo4 in San Antonio, Texas Subject: Re: horrible milage (warm up transmittor?)
Do you drive the car often? I had a similar issue with my tii, which is only on the road a couple days a month. Injection setup, cold start, etc. checked out fine. Turned out there were some pinhole leaks in the fuel tank allowing fuel to seep slowly out of the tank. Restored the tank, now I'm back up into the 25 mpg range. Good luck!

Date: 3-27-08 02:46 From: fiftytakedowns in San Rafael Subject: Re: horrible milage (warm up transmittor?)
okay okay I'll check on all that and get back and this IS my daily driver, thats why this is of importance. _________________ 1974 tii "Mr. T"

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