The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
The economy is better than when I started the thread - for my old man it's about 25L per 100km on short trips - 4 to 8km type length. Towing the boat on the highway achieved 21L per 100km. I borrowed the vehicle for a week to commute to and front work (trips of 15km to 25km in length) and achieved 19.84L per 100km which is an effective tank range of around 360km. Not great but better than 43.2L per 100km where we started!
This is on normal unleaded 91 from United Petroleum. Might be interesting to see if Premium or E10 makes a difference?
What we did to improve it is in the posts previously, but in summary:
Replaced all spark plugs
Replaced two ignition leads
Replaced fuel filter
Cleaned MAF sensor with CRC MAF Cleaner
Checked MAF sensor voltage reading
Replaced thermostate
Adjusted timing
Replaced vacuum advance unit
Replaced vacuum advance vacuum hoses
JC had previously checked the temperature sensor readings
I can only suggest a couple of other checks.
1 Check that the TPS reads less than AFAIR .49 volts at idle. It has to be under that for override injector cutoff to work over 1500RPM.
2 Check the centrifugal advance by turning the rotor a bit and seeing that it springs back.
3 Check the OHMS of the fuel temperature sensor on the rail.
4 Check that the Fuel pressure regulator diaphragm is intact by sucking on it. Check that the little housing on the back of the manifold is tight, and that there are no splits in the hose to the fuel pressure regulator. It might be worthwhile to fit a new FPR.
Although you say the temperature sensor has been checked ,was it the correct one? The temp sensor for the ECU is a two terminal one near the RH front injector. Sometimes the injector for that cylinder and the temp sensor terminals can be mixed up. They are different colours AFAIR. You would have a miss but with 8 cylinders you sometimes don't notice a miss. The single terminal sensor is only for the gauge.
Also check that all injector plugs have continuity as the wires can break inside the loom. If one is broken you can just tee off the next one along as they batch fire.
From my 91 RRC you should get about 20Lper100km around town and 17 or better on the highway .
Regards Philip A
A quick update, almost nine months after this thread started. Borrowed the old mans D1 V8 again for the past few weeks and have been achieving around 17.61L per 100km commuting to and from work which is about 28km away from home each way. Brother used it to travel up the coast (around 600km round trip) and claims he got as low as 16L per 100km. So were a long way better than where it started! A little bit sad that achieving this still horrendous economy gets me excited but the noise of it does sometimes make me consider owning my own Rover V8...
+Got less than 19 months and only around 6,000km out of new replacement vacuum advance unit I fitted back on 25 February 2018. Fuel economy has pushed back out to 19.6L/100km as a result. It was a Powerspark unit from the UK that came recommended. It seems that I’m not the first to have this issue:
1993 Discovery High fuel consumption
I’m now seeking a suitable good quality replacement of diaphragm for rebuilding < RTC3201 VACUUM ADVANCE UNIT 2 PIN DISTRIBUTOR 3.5/3.9 EFI - a reliable brand? Replace >.
In the interim I might advance the timing out to 12* as per JC’s earlier advice:
Mine - modified MY03 LT L318 Discovery 2a HSE Td5 15P
Hers - MY12 L319 Discovery 4 2.7L TDV6
Dads - MY12 L319 Discovery 4 2.7L TDV6
Sister-in-laws - MY98 LJ Discovery ES 3.9L V8
Have you tried these guys Advance Diaphragm Options - Home | Facebook
They rebuild the genuine Lucas which is better made than the aftermaket available.
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