lost power and using more fuel

Submitted: Friday, Jun 17, 2016 at 18:11
ThreadID: 132779 Views:3826 Replies:10 FollowUps:2
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I have a 1993 rodeo,2.8l turbo diesel.Lately it has been down on power and i am using more diesel per 100k.I have put diesel injector cleaner in the tank and it has made no difference.Does anyone have any ideas what the problem might be.
Thanks All
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Reply By: TomH - Friday, Jun 17, 2016 at 18:54

Friday, Jun 17, 2016 at 18:54
For a start more info would get better replies otherwise like doing brain surgery with a blindfold on
1 How many K's
2 does it use oil
3 what sort of work does it usually do EG potter around, Tow a big van???

If high k's could simply be worn out.
AnswerID: 601474

Follow Up By: Member - Stuart and Gunny - Friday, Jun 17, 2016 at 19:20

Friday, Jun 17, 2016 at 19:20
It has done 103,000 klm and does not use any oil.The rodeo is a motorhome and does not tow anything.The car just drives around Australia and very little city driving.
FollowupID: 870965

Reply By: Hoyks - Friday, Jun 17, 2016 at 19:29

Friday, Jun 17, 2016 at 19:29
When did you last change the fuel filter?

I had a dirty one and fuel consumption actually went up which is rather counter intuitive.

An air leak from the intercooler plumbing could be another cause. Less air going in, but the pump is still pushing fuel and you are using more right boot to try and get the performance which will lead to more fuel useage.
AnswerID: 601477

Reply By: 508 - Friday, Jun 17, 2016 at 19:40

Friday, Jun 17, 2016 at 19:40
Naturally check your aircleaner but you could also check air hose between aircleaner and intake manifold. The air hose could partially collapse under power and restrict air flow if it has been softened up from oil from the breather.
AnswerID: 601478

Reply By: Athol W1 - Friday, Jun 17, 2016 at 20:04

Friday, Jun 17, 2016 at 20:04
Stuart & Gunny
As well as checking air and fuel filters take a close look at the hoses to and from the Turbo (and intercooler if fitted), as any loss of boost pressure will have a dramatic effect on power output.

Tappet clearance also has a noticeable effect on both economy and performance in that engine, and tappets must be checked when dead cold.

Hope this helps.
AnswerID: 601480

Reply By: Member - kyle46 - Friday, Jun 17, 2016 at 20:23

Friday, Jun 17, 2016 at 20:23
i'd say its time for new injectors.
I just did F250 powerstroke , using 5 lt/100 less now
AnswerID: 601482

Follow Up By: Bigfish - Saturday, Jun 18, 2016 at 07:30

Saturday, Jun 18, 2016 at 07:30
New injectors at 103 thousand ks....you are joking.

I,d check fuel and air filters. Check for hose collapsing or leaking hoses to fuel line. Check that manifold is not clogged. These are simple things to look at. Check these out and if still problems check on line with various threads/sites before you throw money at a stealer/dealer.

FollowupID: 870988

Reply By: Ron N - Saturday, Jun 18, 2016 at 10:56

Saturday, Jun 18, 2016 at 10:56
I'd be suspecting the turbocharger. Find a turbocharger/fuel injection place and get them to run some simple tests such as manifold pressure and EGT.

If the turbo comes out O.K., then fuel flow rate check is next, plus a check for air intake restriction. It's not the first time a rat has made a nest in an intake pipe or aircleaner.

Cheers, Ron.
AnswerID: 601508

Reply By: Pete Jackman (SA) - Saturday, Jun 18, 2016 at 16:05

Saturday, Jun 18, 2016 at 16:05
I would also be checking the pipework between the turbo and inlet manifold, especially after the MAF sensor. Any leaks there would give the symptoms you describe. Do you get any black smoke under heavy acceleration? That is another symptom of problems there.

No smoke, I would look at leaks between the head and turbo - gaskets first.

Last year in the UK we bought a cheap diesel Mondeo to get around. A couple of weeks in it started to lose power, use more fuel and blow smoke. A mechanic didnt find anything. It got progressively worse until we were heading back from Wales up the M4 laying a smoke screen so dense the bloke behind me put on his head lights in daytime! Digging under the bonnet I found a split in last centimeter of the intercooler hose (common issue with the mid 2000 Mondeos). Trimmed off the hose with my trusty leatherman and reconnected it. Problem gone, power back and no more smoke.


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AnswerID: 601521

Reply By: fisho64 - Sunday, Jun 19, 2016 at 10:13

Sunday, Jun 19, 2016 at 10:13
funny reading some suggestions here, must spend a lot of money unnecessarily!

Start with the basics
Look for a fuel leak
Have someone (who knows a little) follow you while you drive and observe the colour and amount of any smoke when at 100kmh and while planting the boot.
Black smoke-air restriction like filter etc, turbo, injectors,
White smoke, could also be injectors, stuck thermostat (but usually running too cold for some reason)
Blue smoke, burning engine oil

Dont just slap some new injectors in, or fit a new short block etc

Note-injector cleaner, you've likely already been shafted once here so start the search methodically!
AnswerID: 601556

Reply By: Jim M3 - Tuesday, Jun 28, 2016 at 19:30

Tuesday, Jun 28, 2016 at 19:30
I reckon your intake manifold maybe full of carbon caused by your exhaust gas return valve putting all that unburnt exhaust gas back in to your manifold.
I've had that happen to mine and removed the manifold and cleaned it and bypass the valve in to a catch can and my car has never had so much power and using less fuel then ever.
Cheers Jim
AnswerID: 601933

Reply By: Ron N - Wednesday, Jun 29, 2016 at 13:58

Wednesday, Jun 29, 2016 at 13:58
Your problem is illustrated and described professionally on the website below. Simply put, you have Gunk in your engine.

If you follow the professional advice on the website, you will be able to kill the Gunk Monster and your Rodeo will perform as new.

Don't thank me, I'm only directing you to the professional website - thank Shell, instead. Don't forget to watch the illuminating video. [;-)

Shell website

Cheers, Ron.
AnswerID: 601956

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