Date Registered: 07-2015
TOTAL POSTS: 36
So ok I know I'm new here but I have read a few threads about Bad fuel figures but has anyone come up with ideas that stack up or a check list?
So what I'm thinking is with my T30 is,
I'll run 2 tanks of BP98, than check the figures.( we drive in and out of Wagga at least 5 times a week, about 20km each trip,one way) than i'll check some numbers.
Water temp looks fine, no engine light (fault warning) on.
*I have changed the oil to full syn penrite 10w-50.Ryco oil filter.
*It has a KN air filter that looks clean.
*It had a NGK O2 sensor some time in the last 30k Kms and new plugs.
*Tyre pressure 38psi
*New rear shocks last week and alignment next Monday.(tyres good and even)
*It towed a 8x5 trailer with about 1.5 tonne of fire wood 20km no worries. So is power good.
What I plan to do is change Radiator, it looks old on top tank so flush, new thermastate and coolant as well.
*Clean MAF, to do.
*change gbox and rear diff oils (Manual)
*than if economy is bad, get someone with a good scan tool to check it out. We have a dyno at the Diesel shop I work at.
Q; do we know who makes the injectors for T30 qr25de? Or do the nozzles were?
I Check Diesel injectors but they run far higher pressure so they wear.
What I want to find out is has anyone checked any thing against spec before they replace sensors??
Is there things like a water temp sensors that the ECU uses because if it isn't right it will retard timing and add more fuel till it thinks it at the correct temp?
Sorry for the long post, I just like facts and answers. i don't make enough money to throw at things because I think that's the problem. I see to many things being sent to the shop i work at, that so called Mechanic's and some dealers, don't know what to look for or can't interpret the scan tool they have.
If anyone can Answer any of my questions that would be great.
I may even become a full member to get hold of the workshop manual.
Cheers, and good night.
T30 August 2006
Near Wagga Wagga.
13/Aug/2015, 11:47 pm
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6006
Re: Bad fuel economy
10W50 oil is probably too thick unless temp is always warm but in Wagga I don't think that is your case. I use 5W40 Penrite Full-synth in mine. The lower 5W is needed to make sure the oil is not too thick at low temps and the 40 gives it more room in higher temps to not breakdown as easily.
Yes, clean your intake with some of the Subaru intake cleaner. Better yet take the throttle body off, clean it and inside the intake manifold then do the idle air relearn and ECU reset.
Also if your injectors have not been replaced, either replace them or do a service NOT A CLEAN as the internal filter baskets might be clogged. See this link for how.
Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My CarPC Worklog
14/Aug/2015, 8:10 am