What to check to reduce MPG?

BMCC · Post by **BMCC** » Wed Apr 11, 2012 12:28 pm

A guide to what spark plug colour indicates:

http://www.classic-car-magazine.co.uk/a ... chart.html

Is there a catalytic convertor on the car?
What about poor ignition system?

'92 Si VTEC · Post by **jjmartin349571** » Wed Apr 11, 2012 12:29 pm

I'd be interested to know about the plugs too, I'm getting crap mileage from my car and my spark plugs look the same, even though they were new only a few months ago. I think my mechanic mate said to check if they're wet after the engine has been run up to temperature?

littlefeller · Post by **littlefeller** » Wed Apr 11, 2012 12:34 pm

plugs look fine to me, 3rd one in looks richer but that could be a compression difference, have you tested the compression, now that would fool the ecu

Post by **Ammo** » Wed Apr 11, 2012 12:44 pm

BMCC wrote:A guide to what spark plug colour indicates:

http://www.classic-car-magazine.co.uk/a ... chart.html

Is there a catalytic convertor on the car?
What about poor ignition system?

Yes car now has a Cat on it and returned 200 miles to a tank, put it on to see if it would help

It basically had a new dizzy when I got the car due to running issues

Post by **Ammo** » Wed Apr 11, 2012 12:45 pm

littlefeller wrote:plugs look fine to me, 3rd one in looks richer but that could be a compression difference, have you tested the compression, now that would fool the ecu

I'll comp test it this afternoon, I've gotta go out, does the engine need to be cold to do a comp test?

littlefeller · Post by **littlefeller** » Wed Apr 11, 2012 1:01 pm

doesnt make much difference really as to loss that much compression to do that to your fuel it wouldnt matter hot or cold

2lude · Post by **2lude** » Wed Apr 11, 2012 1:42 pm

What about the basics ? Binding breaks wheel bearings ? I think your engine is probably better than most so I would say look at these also your going to hate me for saying this but how's your knock sensor if its Jdm

2lude · Post by **2lude** » Wed Apr 11, 2012 2:36 pm

Also have you tried red x to clean your injectors ? And octaine booster also re set your ecu as it might have learnt the wrong setting

Post by **Ammo** » Wed Apr 11, 2012 3:20 pm

2lude wrote:What about the basics ? Binding breaks wheel bearings ? I think your engine is probably better than most so I would say look at these also your going to hate me for saying this but how's your knock sensor if its Jdm

Brakes are all free, checked them the other day

And Knock sensor is working as I have no CEL light

Post by **Ammo** » Wed Apr 11, 2012 3:20 pm

2lude wrote:Also have you tried red x to clean your injectors ? And octaine booster also re set your ecu as it might have learnt the wrong setting

Not not tried that, does that really work or is it a myth?