 MPG change, where to start looking? |
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| 914Bryan |
 Feb 10 2013, 08:23 AM
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Member  Group: Members Posts: 190 Joined: 6-June 11 From: Orange County Member No.: 13,162 Region Association: Southern California  |
I know this isn't an exciting high performance question, but a question just the same.
I'm having an issue with the mileage my 74 2.0 DJet and am wondering where to start looking for the problem. I commute 60 miles each way to work (120 total). My driving is 98% freeway, non rush hours so a steady 75 mph, motor is turning 3200. I could always count on 32mpg, day in, day out. Over the last two months, it has slipped to 28mpg. I burn a tank a week, so this has been about 8 tanks of gas that I have noticed this. Engine is running fine, no change in performance. Would a tardy valve adjustment cause this? I'm a little over 6k since my last one. Any ideas? |
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| rick 918-S |
Feb 10 2013, 10:39 AM
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Hey nice rack! -Celette Group: Members Posts: 20,948 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region 
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Fast check for the points is ignition timing will change. Smaller gap will have less of an effect on mileage as it will increase the time to coil builds energy. (which is actually a benefit) The change is in efficiency will be in the timing change by the shift in dwell angle.
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Posts in this topic
914Bryan MPG change, where to start looking? Feb 10 2013, 08:23 AM
jonvo4591 I was in an autotive training class last week and ... Feb 10 2013, 08:43 AM
JamesM
I was in an autotive training class last week and... Feb 10 2013, 10:20 AM somd914 Have you noticed any other issues with the engine?... Feb 10 2013, 09:31 AM rick 918-S Fuel was my thought also. There is no good reason ... Feb 10 2013, 09:37 AM tscrihfield
Fuel was my thought also. There is no good reason... Feb 10 2013, 09:54 AM 3d914 Ditto on the points. And when you check them, don... Feb 10 2013, 10:04 AM Cupomeat With everyone else's advice, I'd go over t... Feb 10 2013, 10:22 AM Vacca Rabite
Now, strangely my audi 1.8t motor seems to give ... Feb 10 2013, 10:33 AM Cupomeat
Now, strangely my audi 1.8t motor seems to give... Feb 10 2013, 10:34 AM 6freak
Now, strangely my audi 1.8t motor seems to give... Feb 11 2013, 11:16 AM Tom_T
I know this isn't an exciting high performanc... Feb 10 2013, 01:33 PM Dave_Darling It is normal for your fuel economy to suffer when ... Feb 10 2013, 02:53 PM bulitt Rear brakes dragging? Feb 10 2013, 03:06 PM bandjoey IS THERE A WAY to test the gasoline to see the alc... Feb 10 2013, 07:53 PM Vacca Rabite sure. run to flaps and get some test kits. they ... Feb 10 2013, 08:03 PM 914Bryan Thanks everyone, this is all great advice! Mos... Feb 10 2013, 08:09 PM euro911 Having the same issue with my Toyota trucks. Been ... Feb 10 2013, 08:21 PM Katmanken Winter gas mix has more aromatic volatiles in the ... Feb 10 2013, 08:52 PM jonvo4591 To do a down and drity alcohol content test, you... Feb 10 2013, 09:34 PM r_towle our Prius gets almost 60mpg in the summer.
In the ... Feb 11 2013, 10:23 AM |
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