thedirtycat Posted October 27, 2012 Share Posted October 27, 2012 Recently the car has not run very well when its cold. I've recently changed the spark plugs so there not the problem. I thought it was just the cold weather but I started it up last night and it ran fine when it was cold. A couple of times it seem to be vibrating a bit and idle seems too low and not smooth. When its got the problem when idling it doesn't seem to want to accelerate properly at all. Then as it warms up it seems ok. The other day it was nicely warmed up so I took it over 4k revs and I was waiting for it to fly forward and it just felt like it was holding back and there wasn't much power. Yesterday like I said it had no problem when I started it up when it was cold and after I had drive around town I gave it a blast and it went like a rocket. I read a similar thread recently and saw someone talked about old o2 sensor could cause a problem. The car never cuts out or anything though. Quote Link to comment Share on other sites More sharing options...
Ian C Posted October 29, 2012 Share Posted October 29, 2012 Check the reading on your o2 sensor http://www.mkivsupra.net/vbb/showthread.php?35940-Narrowband-O2-Sensor Quote Link to comment Share on other sites More sharing options...
thedirtycat Posted October 29, 2012 Author Share Posted October 29, 2012 Check the reading on your o2 sensor http://www.mkivsupra.net/vbb/showthread.php?35940-Narrowband-O2-Sensor Ah ok thanks. I'll have a look. Its strange because the idle has been fine the last few times I've taken it out. Also ran fine in general. Will check it out though. Quote Link to comment Share on other sites More sharing options...
Ian C Posted October 30, 2012 Share Posted October 30, 2012 It sounds overfuelly, but over 4000rpms it should ignore the o2 sensor and go open loop anyway, so that's a bit odd. Have you got any diagnostics available like wideband O2 or anything? Quote Link to comment Share on other sites More sharing options...
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