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MPG/problem post. Very long and detailed. 700

posted by  Volvodad on  Sun Apr 9 15:20 CST 2006
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last visit: Thu Oct 23 16:18 CST 2014
[RELATED]

Proper NGK plug is BP6RES gapped at .028. Last time I bought = $2 each at NAPA.

Two things that got me the biggest improvement in fuel economy were:
- new air filter long ago on the '83 240; immediate 10% better highway MPG.
- new EGR solenoid on my 940 LH 2.4.

I, too, had the check engine light (MIL) go on in the 940, checked the codes and had the usual "fuel trim" readings plus one that indicated a bad throttle position switch. Fuel mileage was well down. Cleared codes and light - back it came. Checked all that I could with no improvement - gave up and went to the dealer. Dealer diagnosed a bad EGR solenoid (Calif. car with the ECU-controlled EGR). Lotsa $$, but no more MIL for 10k mi now, and a serious improvement in fuel mileage.

The Cat converter suggestion was a good one. If the car is putting any oil through the combustion chambers it can plug the converter fairly soon.
--
Bob (son's 81-244GL B21F/M46, dtr's 83-244DL B23F/M46, my 94-944 B230FD; hobbycar 77 MGB, and a few old motorcycles)






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