poor fuel economy

Submitted: Sunday, Apr 17, 2005 at 16:16
ThreadID: 22135 Views:1690 Replies:6 FollowUps:2
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hello forum friends..

having an issue with my 2.8 diesel 4runner, i used to get around 500k around town and anywhere from 500k -650k on longer trips, recently only been getting the 450 mark and thats pushing it... it has 141000k's on the clock, has full toyota service history from new to 115,000 since then ive serviced it every 5000, this includes oil, oil filter, air filter and fuel fillter..

i also send my oil for testing in the lap every so often, why am i getting such poor fuel economy, i have tried running algecide, injector cleaner etc, with no results, i only use BP or mobile diesel

any ideas??

regards
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Reply By: Big Woody - Sunday, Apr 17, 2005 at 16:27

Sunday, Apr 17, 2005 at 16:27
Hi Kerry,
Have you added a roofrack, bullbar, spotlights or anything else on the outside of the vehicle that might affect aerodynamics?
I had a diesel troopy that dropped 2 mpg when I put on the bullbar and another 3 mpg when I added the roofrack.
Another variable can be any alteration of rim/tyre size. If the overall diameter has changed the vehicle can labour more at some speeds and use more fuel.

One final question - You say you have your oil tested in the "LAP". Sounds a bit sus.

Cheers,
Brett
AnswerID: 107110

Reply By: SantaAus - Sunday, Apr 17, 2005 at 17:36

Sunday, Apr 17, 2005 at 17:36
If you havn't already, get the injectors re-done, i had my whole fuel system re-done, and i have lost some L/100km, but it has picked up on performance. (Terrano 2.7L Diesel) i get about 12L/100km at the moment.
SantaAus
AnswerID: 107117

Reply By: ianmc - Sunday, Apr 17, 2005 at 19:53

Sunday, Apr 17, 2005 at 19:53
Fitted wider tyres? Use 5-10% more fuel .
Dragging brakes?
Different brand of fuel? If not maybe its changed its composition, try another!
Injector pump timing?
If all else fails trade it on a Mitsubishi. They need your business!
AnswerID: 107141

Reply By: D-Jack - Sunday, Apr 17, 2005 at 22:04

Sunday, Apr 17, 2005 at 22:04
Don't forget wheel allignment to consider.
AnswerID: 107171

Reply By: Member - Kerry (VIC) - Monday, Apr 18, 2005 at 08:50

Monday, Apr 18, 2005 at 08:50
the vehicle is fitted with a bullbar winch roof rack bigger tyers, but its had these on there since i purchased, so i think the only thing left to do is new injectors, is this normal for a diesel with 140,000 on the clock??

thanks for your replies..

Kerry
AnswerID: 107200

Follow Up By: Shaker - Monday, Apr 18, 2005 at 09:00

Monday, Apr 18, 2005 at 09:00
Fitting new injectors can increase fuel consumption!
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FollowupID: 364157

Reply By: phil - Monday, Apr 18, 2005 at 14:48

Monday, Apr 18, 2005 at 14:48
I got a 10% improvement after I replaced the air cleaner element in my Bravo diesel. There didnt seem to be anything much wrong with the old one, just due for replacement on time. It had been blown out regularly.

Phil I
AnswerID: 107236

Follow Up By: Member - Kerry (VIC) - Monday, Apr 18, 2005 at 15:18

Monday, Apr 18, 2005 at 15:18
all oil, oil filter, fuel and air filters are changed every 5k with new stuff. im thinking it could even be a colapsed muffler.. also above i meant i get my oil tested at the lab not the lap. this all come back fine..

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FollowupID: 364200

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