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dabofoppo
Original Poster
480 posts
40 months
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Hi guys. I recently got a mk2 mr2 (g plate) and since I got it last week iv been averaging 19mpg. What could be causing that? Iv found the brakes binding a bit and the exhaust is blowing but surely they won't make it that bad? It has the 3sge engine.
Cheers.
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Midshipracer
64 posts
51 months
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O2 Sensor might be the problem, Its used (on mine anyway 3S GTE) when pootling around the O2 sensor gauges the air fuel mixture. If its not getting a good reading or none at all i.e. broken. It puts more fuel in as a safety thing Only when you are on WOT aka foot down does the ECU take over measuring throttle positioning etc N.B as with anything you read on the internet its important not to take it as gospel could be one of many things 
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Mastodon2
5,740 posts
34 months
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Is it a turbo? I know the MK2 turbos could be pretty bad on fuel, around the 22mpg mark according to some members, even when working normally, though I suppose it depends on how you drive it.
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TotalControl
6,253 posts
67 months
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Check the O2 sensor, mine went on my ST202 Celica and gave me around 17mpg (9 at its worst). Definitely worth checking.
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danjama
869 posts
11 months
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How does one check the o2 sensor is working?
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Midshipracer
64 posts
51 months
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You can't really check if its working you, gotta do the error code thing. I think its code 22
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clarkson22
76 posts
33 months
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brakes and the blowing exhaust will contribute, how are all ignition components? dizzy, rotor arm, plugs leads, id go about checking the ecu coolant temp, green sensor on the water elbow to the left of the dizzy cap, is it a rev 1? im sure the n/a rev1 did not have a lamba
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danjama
869 posts
11 months
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Midshipracer said: You can't really check if its working you, gotta do the error code thing. I think its code 22 Ah thanks. Where is the port on these?
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clarkson22
76 posts
33 months
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at the back behind inlet manifold, labled 'diagnostics'
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danjama
869 posts
11 months
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clarkson22 said: at the back behind inlet manifold, labled 'diagnostics' Thanks again, shame there's no Haynes manual or similar for the mk2, love reading through those.
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Tib
367 posts
48 months
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Even if no code comes up, it doesn't necessarily mean that the o2 sensor is working correctly. Mine didn't show up a fault code and I was getting similar MPG figures.
I found the car very 'lumpy' to drive when pootling around town; the throttle was either on or off and the whole ride felt quite jerky. You can get genuine o2 sensors for about £50 if you look in the right places. They are an absolute pain to fit mind as they are usually rusted in.
You can actually try disconnecting the sensor for a while and see if it improves/changes your running.
If it were me I'd sort out what I knew to be wrong first though - the brakes and blowing exhaust. If you need a new 'xorst it might be an idea to wing a new o2 sensor in as par for the course...
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dabofoppo
Original Poster
480 posts
40 months
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Cheers for the help guys. I dont think the car has a lambda sensor but ill get it checked when i fit the new manifold and the brakes are hopefully getting done tommorow. However it does seem to be improving itself.
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hygt2
147 posts
48 months
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If you have an air leak upstream of the lambda sensor, it will cause false reading and cause wrong fuelling.
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amnesia182
442 posts
31 months
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Worth checking the timing with a strobe, too. Simple to check and adjust on the N/A mk2
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