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DAM0's Avatar
Join Date: Dec 2010
Posts: 6
1980 924 MPG Help!

Hey All!

Having a problem with my 1980 924, which is I am roughly only getting 10 MPG!!

There are no visible leaks to be found, replaced the air filter which was very 'oily' other than that I can not determine what could be the cause of it.....

Can anyone suggest what I could be missing????

Cheers Guys!


Old 01-06-2011, 09:19 AM
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Toofah King Bad
Rasta Monsta's Avatar
Join Date: Oct 2006
Location: PacNW
Posts: 3,848
How do your spark plugs look? Have you tested control & system pressures? Does your dipstick smell like fuel?

Depending on the service history of the car, a good and inexpensive first step would be to pull the injectors, including the cold start valve, and have them professionally cleaned (less than $100). I would follow this with an oil change.

An ignition refresh might help as well (wires, plugs, cap & rotor), but it will cost a little more. Don't use cheap wires. . .not worth it. Kingston wiresets have been recommended.
» 1980 931 - Got boost? ♦ 1987 924S - Pro44 ♦ 1987 924S - Junkyard score «

"DETERMINATION. Sometimes cars test us to make sure we're worthy. Fix it." - alfadoc
Old 01-06-2011, 09:57 AM
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Registered User
Join Date: Nov 2004
Location: Alberta, Canada
Posts: 2,696
The 1980 has lambda, so I'll bet your mixture is all screwed up. Have you replaced the O2 sensor? A quick tune is to warm up the car and then set the frequency valve (which is controlled by the O2 sensor) to roughly a 45 - 50 degree dwell (if I'm wrong one of the 924board guys will come along and correct me). If you don't want to monkey with the lambda system, you can tune the car by feel. Disconnect or disable the O2 sensor, loosen the distributor hold-down nut and set the ignition timing. If you can get 6 to 10 deg BTDC you're doing well. There are marks on the flywheel, but I'm not sure what they're stamped at on the North American 1980 924. Usually, I hold the throttle at 2,000 RPM and hunt for the sweet spot by turning the ignition distributor. After the ignition is set you can play with the mixture at the fuel distributor. There again, look for the sweet spot; then lean things out a little more. This all is predicated on the fact that you've got no vac leaks and the car is already in good repair/tune. Also, I'd suggest hopping on over to :: Index and hitting up the gang there. BTW how's you warm-up regulator? Any leaking injectors? Cold start valve? There is a number of potential culprits.

Hope this helps!
'84 944 - new-to-me DD!
'83 944 - looks like ass, runs like horse - in primer.
'82 931 - roadster project - forever incomplete.
'80 924 - spouse's yellowjacket.
Some wrecks and a 924 racer.
Old 01-06-2011, 10:14 AM
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924RACR's Avatar
Join Date: Sep 2005
Location: Royal Oak, MI
Posts: 1,216
That seems like incredibly bad mileage for an NA, even if you kept your foot on the floor all the time!

Surely there should be some other symptoms of poor running?!?

Otherwise, I'd echo the previous advice...
Vaughan Scott
Old 01-06-2011, 11:20 AM
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mayPOR944's Avatar
Join Date: May 2010
Posts: 161
i get the same gas milage more like 13 its a 2.5 n/a changed spark plugs, new o2(did not even make a difference waste 124 bucks) fuel filter only has maybe 15k on it. i gave up, still cant beleive it has a 21 gal gas tank??

Old 01-08-2011, 09:47 AM
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