Yorker said:
What MPG has the Green Rover returned since the EFI conversion?
I have been plagued by teething problems since last year's conversion that showed me the folly of buying used electrical parts off ebay and Since finding hopefully all the problems have not been able to afford fuel for a long trip to get good measurement numbers from. Current cost to fill the tanks with regular at my local "cheapo" station = $151.20 and still climbing So I can not yet provide an accurate answer.
Pre conversion (Ford 302 with 500 cfm carb set up for economy) = 15 MPG (US gallons) highway & about 8 MPG stop & go.
Pre-pre conversion (LR Series III 2.25L engine) = 15 MPG highway & about 8 MPG stop & go.
Post conversion (1970 Ford 302 with 1991 Mustang EFI), best guess so far = about 17 -18 MPG highway, about 12ish - 13ish MPG stop & go. The engine runs a LOT smoother on rough trails.
As a comparison I looked up the factory MPG ratings:
- 1991 Bronco 5L, 15MPG highway, 11 MPG city
- 1991 4WD F150, 16 MPH highway, 12MPG city.
I think I'm doing a couple MPG better than this. It would take about $1000 worth of fuel on a single trip to get good readings.
Due to all the teething problems, I have gotten fairly good at trouble shooting a 1991 Mustang EFI system in the field. and know that in limp home mode I get 13 MPG highway which is fairly good MPG for a coiler V8 Land Rover
Teething problems:
EEC found dead at initial start up (used ebay)
Low pressure fuel pump found dead at start up (used ebay)
MAF out of spec & incorrect for the EFI (ebay- wrong year stated)
Throttle position sensor out of spec & wrong year throttle body (ebay- wrong year stated)
Idle air bypass valve not working properly (used ebay)
Low pressure fuel pump (sucks fuel out of tank & gives to high pressure pump) failed with about 1,500 miles on it (new- Carter). Fuel pump failure overloaded after market relay which ran both pumps. Replaced with factory ford fuel pump relay & modified wiring slightly.
Broken wire at connector base in O2 subharness
kept the computer from reading one bank & leaned it out a lot. (harness used ebay)
fuel injectors mostly clogged & unable to be cleaned in vehicle (used ebay)
Fuel pressure regulator not producing proper fuel pressure (replaced high pressure fuel pump first) (used ebay) Discovered that computer diagnostics does not check fuel pressure. If the right voltage is getting to the fuel pump the diagnostics does not catch pressure regulator related problems