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| Rover 1275 SPI fuel economy!!!!!! https://www.ausmini.com/forums/viewtopic.php?f=2&t=18927 |
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| Author: | doogie [ Mon May 08, 2006 7:28 pm ] |
| Post subject: | Rover 1275 SPI fuel economy!!!!!! |
Our Rover 1275 SPI engined clubby does'nt seem to get the best fuel economy, it's just done over 200 klms & has gone thru 35 litres of fuel, is this normal???? i would'nt belive so. Anybody with a rover mini what kind of economy are you getting? or any tips on how to increase economy???/ Doogie |
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| Author: | Mokesta [ Mon May 08, 2006 7:38 pm ] |
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Check the engine temp sensor is working. If it thinks it is cold, it will richen it right up. |
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| Author: | snowie [ Mon May 08, 2006 9:23 pm ] |
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thats way too high, i normally get about around 10 ltrs to 100km. thats a rough estimated, and with me going on constant hills runs  im not sure what the specified comsumption is. Do you have a workshop manual for the engine? Might be a troubleshooting guide in there.
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| Author: | mrcooms [ Mon May 08, 2006 9:43 pm ] |
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I find i generally get around 8L /100km, driving around city and cruse's I recon my fuel guage is out though cos ive never even come close to 35L when filling up max ive ever put in the tank was around 25L. |
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| Author: | PetenSoaf [ Tue May 09, 2006 8:59 am ] |
| Post subject: | Re: Rover 1275 SPI fuel economy!!!!!! |
2 S's & a clubman wrote: Our Rover 1275 SPI engined clubby does'nt seem to get the best fuel economy, it's just done over 200 klms & has gone thru 35 litres of fuel, is this normal???? i would'nt belive so. Anybody with a rover mini what kind of economy are you getting? or any tips on how to increase economy???/
Doogie Have a look at the MAP sensor line. From the ECU, there should be a thin plastic tube running to the back of the inlet manifold via an oil trap. The plastic line is connected to the ECU, the oil trap and the manifold by really cruddy rubber elbows which crack, split and leak. . .once this happens, the ECU assumes you're driving flat out all the time (no vacuum signal) and dumps in the appropriate amount of fuel. . . When I fixed the elbows on our old SPi Cooper, fuel economy went from about 20mpg up to about 50. . .BIG difference. The line is difficult to get to (particularly at the back of the manifold) but then, what ISN'T difficult to get to on an injected Mini? Hope this helps. |
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| Author: | doogie [ Tue May 09, 2006 9:27 am ] |
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All the vacuum hoses have been replaced since i've had it, still crap economy either way. Doogie |
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| Author: | PetenSoaf [ Tue May 09, 2006 10:30 am ] |
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2 S's & a clubman wrote: All the vacuum hoses have been replaced since i've had it, still crap economy either way.
Doogie Well. . . if you're sure 
The MAP sensor line was a fair bastard to seal in my case. . . If you want a crude (but effective none the less) test to see whether the MAP sensor is working, then while the car is idling unplug the vac line from the ECU, block the end going to the manifold and see what the idle speed and engine note does. If it doesn't change, then there's a problem with either the sensor or the line. If you then hook up a vac line to the ECU and apply vacuum (suck on the pipe ), the engine note should change if the MAP sensor is working. . .if not, it's probably stuffed - in which case, it's new ECU time. If the engine note does change with sucking, then there must be a leak in the manifold to ECU line somewhere. .
As Mokesta said, it could also be a dud coolant sensor. . .this is on the bottom of the inlet manifold and changing it is probably the single most difficult job you can do on a Mini without removing the motor. . . 
Air temp sensor doesn't seem to make much difference - when we bought our Cooper, it had a K&N cone filter with no provision for the air temp sensor so, in true Japanese 'tuning' style, it was left dangling in the engine bay. After putting the original air box (and sensor) back on. . .there was absolutely no difference in ease of starting, drivability or fuel economy. . . |
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| Author: | weevel [ Tue May 09, 2006 12:53 pm ] |
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I reckon I used to get about 8L/100km in our old 1992 SPI Automatic Mayfair, so there's definitely something wrong there. Good luck in sorting it out |
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| Author: | snowie [ Thu May 11, 2006 11:09 pm ] |
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check to see if the temp sensor wire has come out. Iv'e had a lot of trouble with mine, it used to always come out so I had to crimp the plug a little bit. It's a bastard to get in, i found the easiest way was to disconnect the raditator hoses going into the throttle body. I didn't notice any difference in economy when it was disconnected though, and steve at brickworx noticed it was unplugged and said it didn't really matter. |
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| Author: | willy [ Thu May 11, 2006 11:42 pm ] |
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Give Steve a call, see if he's coming into Syd when we go up to Brisbane for attempt two 
If so, he can fault test your computer... see exactly whats wrong with it, etc. Or you could hunt down any other Rover "specialist" that you might have in Sydney, but good luck
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| Author: | mutant mini [ Fri May 12, 2006 9:09 am ] |
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willy wrote: Give Steve a call, see if he's coming into Syd when we go up to Brisbane for attempt two
If so, he can fault test your computer... see exactly whats wrong with it, etc. Or you could hunt down any other Rover "specialist" that you might have in Sydney, but good luck When is Steve going to Brisbane? |
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| Author: | EST-071 [ Fri May 12, 2006 9:15 am ] |
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Give OZCOOPER at Berkeley Vale a call, they should be able to help out with a computer to check it all out. [email protected] 3/8 Ketch Close, Berkeley Vale New South Wales, Australia 2261 Ph: 02 43889059 Fax: 02 43884201 Pete |
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| Author: | lurker [ Fri May 12, 2006 1:57 pm ] |
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I did a fuel test with my 1993 SPI Rover Mini Mayfair, (Auto) I put in 20 litres and got 258kms, which isn't too bad when you break it down. Works out at about 7.5 litres per 100kms. What everyone said roughly. Not bad for a little go kart. My V8 Calais used to use around 13-14 litres of fuel per 100kms, and that wasn't city driving where as now I'm doing city driving. Glad I have a MIni.
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| Author: | doogie [ Fri May 12, 2006 4:22 pm ] |
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Thanks Lurker, thats the economy im looking for, hopefully Steve from Brickworx's will be in Sydney next week to plug it in & reset the computer, im sick of mini performance & magnum 440 V8 economy. Doogie |
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