Greystoke Posted June 27, 2005 Share Posted June 27, 2005 Doing a constant 60mph I am only getting about 14MPG. I have reset my ecu, but this has made no difference. Is there anything else that might be causing this? Link to comment Share on other sites More sharing options...
stevie_b Posted June 27, 2005 Share Posted June 27, 2005 Obvious questions first, but worth asking just in case.... Has it been a gradual decline in MPG, or a sudden drop? If a sudden drop, have any mods/ servicing been done to the car at that time? What revs does the car tick over at? A clogged air filter could cause low MPG values... Link to comment Share on other sites More sharing options...
supRo Posted June 27, 2005 Share Posted June 27, 2005 worn spark plugs? Link to comment Share on other sites More sharing options...
Greystoke Posted June 27, 2005 Author Share Posted June 27, 2005 I only have the car about 1 month. It had a service before I collected it. Spark plugs were changed. They only mods that I can see that have been done to it are: 1. An ARC Induction kit was installed. 2. There is 1 straight pipe from the second cat to the backbox (RS*R Exhaust Magic). Other than those I can’t see anything else that was changed. The air filter is a possibility, but can’t seem to find anyone selling Arc filters. The car ticks over around 800-900 revs. Link to comment Share on other sites More sharing options...
Ian C Posted June 27, 2005 Share Posted June 27, 2005 O2 sensor When it gets dirty/old, it'll start faking a lean signal and forcing the ECU to run over-rich. Not only does this bugger up any closed-loop economy (i.e. anything other than acceleration and coasting) but it fails you your MOT as well, due to the emissions. -Ian Link to comment Share on other sites More sharing options...
stevie_b Posted June 27, 2005 Share Posted June 27, 2005 Tickover doesn't sound excessively high. I'm not familiar with ARC filters, but there might be a visual way of telling if its clogged up. Someone more knowledgable than me may be along shortly.... Edit: ... like Ian C, for example! Link to comment Share on other sites More sharing options...
Greystoke Posted June 27, 2005 Author Share Posted June 27, 2005 I had the emissions checked on friday and they are reading fine. Its due its NCT this friday, mayby something will show up there. Link to comment Share on other sites More sharing options...
Digsy Posted June 27, 2005 Share Posted June 27, 2005 Is the aircon on or off most of the time? Link to comment Share on other sites More sharing options...
Todd Posted June 27, 2005 Share Posted June 27, 2005 Sorry but have you checked the plugs? My plugs were "changed" when I bought it but after a few weeks of owning it and checking the plugs myself.....nope old plugs!. Link to comment Share on other sites More sharing options...
Greystoke Posted June 29, 2005 Author Share Posted June 29, 2005 Aircon is not been used. I will check the plugs. What size plug socket is needed to remove the plugs. Link to comment Share on other sites More sharing options...
JohnA Posted June 29, 2005 Share Posted June 29, 2005 I, too, would look at the O2 sensor closely, if the obvious have been verified (airfilter, collapsed exh backbox etc) A tired sensor will still give a reasonable voltage, only lower than it should. The ECU adjusts accordingly, running rich. It may take quite some time before the sensor dies completely and the ECU flags it up. If it's got over 60K miles on the same sensor, I'd change it anyway. (I've got one ordered from the States as we speak.) Link to comment Share on other sites More sharing options...
Steve Posted June 29, 2005 Share Posted June 29, 2005 John, how much are you paying for your 02 sensor? Link to comment Share on other sites More sharing options...
JohnA Posted June 29, 2005 Share Posted June 29, 2005 Haven't got it yet mate. Let's wait and see. Should be 120-130 bucks if it all goes well. My local dealer wants £120+vat, typical $=£ exchange rate plus vat. Link to comment Share on other sites More sharing options...
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