Feb
18

Low Fuel Economy

Does anyone have any idea of why my fuel economy has all of a sudden dropped from 450k's to a tank to 250k's to a tank?? It was all good until we spent a week on Fraser, it copped a bit of a hiding the tracks were so soft and soupy. I got it home serviced it and since then it has been giving me ordinary mileage?? 

Claude io
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fuel

trevis25 wrote:

Does anyone have any idea of why my fuel economy has all of a sudden dropped from 450k's to a tank to 250k's to a tank?? It was all good until we spent a week on Fraser, it copped a bit of a hiding the tracks were so soft and soupy. I got it home serviced it and since then it has been giving me ordinary mileage?? 

Have you checked your air filter ?

Happy io

trevis25
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Yeah I thght the air filter

Yeah I thght the air filter because we may have taken a bit of water when we hit some washouts and i replaced it with a new one. It wasnt that bad when i checked it though. I always just run the standard Ryco brand.

simmo777
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Economy!

Maybe a bit of sand/grit/sea salt spray has gotten into the air intake? Clean/replace air filter, clean MAF and throttle body and report back? Injector cleaner can't hurt but weird to drop from 450-250km... Also maybe a bit of dodgey fuel from the fuel stations on Fraser, had that problem with a 3.5L Pajero on a family trip years and years ago to fraser. Fill a fresh tank of 98 and check highway Km's?

You've pulled some seriously good economy before fraser. When my 2.0L auto was stock I'd be insanely lucky pushing 450 out of a tank to orange fuel light (approx ~38-40L fill)

Now with bigger tyres and roof rack barely getting 350-400 for the same fill. 

2002 5dr Pajero IO QA 2.0L Auto - Lifted, Locked!! 1.925 Low Range - Muddies (205/80/16) - Redback Extractors to 200cell cat to dump at diff Exhaust 

trevis25
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We may have taken some water

We may have taken some water on a few washouts we hit so i checked the airfilter and their was a bit of sand under where the airfilter sits. The MAF sits on top of of the air filter and towards the back of the motor right? How do you clean that? I will clean throttle body and see how it goes also. I think you are right with the dodgy fuel and it seems like its a combo of things, as it has improved slightly as i managed 340 out of the last tank. The wheel alignment was way out also, both wheels were angled in towards each other so i guess they would have been pushing against each other which i imagine wouldnt help. 

Yeah 450 would be max from full to orange light, but always used to be over the 400. Mines 1.8 Manual stock so probably would get a bit better than an Auto? 

simmo777
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1.8 manual

Yeah you would get better economy than my auto - pending driver throttle behaivour haha.

Sounds like a range of things! Glad to hear it is improving. Yeah replace air filter, and then next along the intake is the MAF (honeycomb/mesh looking intake) right after the filter. You can remove from MAF from the intake piping easily and get special MAF cleaner spray (different to throttle body cleaner) and spray that a heap. Also a few of us have plugged the air resonator (little black box) that sits above the exhaust extractors and between Throttle body and Maf (tiny black box that hands down). From my understanding it was installed by Mitsi to reduce intake noise at the cost of a negligable amount of air flow (open to discussion/other theories)

Sounds like the following should get you back to 400+

1. Air filter replacement

2. MAF removal, clean, re-install

3. Clean throttle body

4. Run some injector cleaner through on a tank of 98 and drive it like you stole it for a bit

Might be worth replacing spark plugs next service if you've had a lot of wash out water through the engine bay, just a thought. 

2002 5dr Pajero IO QA 2.0L Auto - Lifted, Locked!! 1.925 Low Range - Muddies (205/80/16) - Redback Extractors to 200cell cat to dump at diff Exhaust 

trevis25
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Fuel Economy                

Fuel Economy                                                  

Thanks again! I will give all those a shot and see how we go, it has been improving each time. I hit 400 again with a tank of octane rich 98 fuel and some injector cleaner. At this rate i might get it over 500! haha thanks again! 

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