MattMe Posted October 31, 2011 Share Posted October 31, 2011 Hey guys. I've noticed recently when my car's cold in the morning under anything more than slight acceleration I sometimes get a slighty lumpy, almost mis-fire kind of feeling that's also noticable on the lift-off when coming to a corner/roundabout/whatever, the car is less smooth than it should be. It's my 2nd Zed and I've never noticed it on my other one, or even this one until recently, so I'm pretty sure it's not normal, but wondered if anyone ahd some advice on what might be the issue or any tests I could do myself to try and diagnose what it is. I know it's had spark plugs fairly recently, oil is clean and at a good level, airbox is clean, no warning lights. I'm at a bit of a loss where to start, to be honest. Had a quick search of the forum but not really found anything similar yet. Cheers! Quote Link to comment Share on other sites More sharing options...
MattMe Posted November 1, 2011 Author Share Posted November 1, 2011 I forgot to mention before, it only seems noticable at low revs, like up to 2,500rpm-ish before it smoothes out. Also, it has a single mass flywheel, but I don't think that's what's causing the issue as previously the car seemed fine. Hope somebody somewhere has some idea! Cheers... Quote Link to comment Share on other sites More sharing options...
M13KYF Posted November 1, 2011 Share Posted November 1, 2011 maf sensor perhaps Quote Link to comment Share on other sites More sharing options...
Dblock Posted November 1, 2011 Share Posted November 1, 2011 My car does this also. Quote Link to comment Share on other sites More sharing options...
Neilp Posted November 1, 2011 Share Posted November 1, 2011 What fuel is being used? Quote Link to comment Share on other sites More sharing options...
Dblock Posted November 1, 2011 Share Posted November 1, 2011 Not sure about the OP. I'm using tesco 99. My car isn't bad at roundabouts just idle. Quote Link to comment Share on other sites More sharing options...
M13KYF Posted November 1, 2011 Share Posted November 1, 2011 Not sure about the OP. I'm using tesco 99. My car isn't bad at roundabouts just idle. aircon on or off Quote Link to comment Share on other sites More sharing options...
Dblock Posted November 1, 2011 Share Posted November 1, 2011 Not sure about the OP. I'm using tesco 99. My car isn't bad at roundabouts just idle. aircon on or off Air con off. It's like every 5 or so seconds it's missfiring or about to stall and it goes down then up. Quote Link to comment Share on other sites More sharing options...
sasha@lazytrips Posted November 1, 2011 Share Posted November 1, 2011 you haven't been doing any donuts recently by any chance? Quote Link to comment Share on other sites More sharing options...
glrnet Posted November 1, 2011 Share Posted November 1, 2011 If it only happens at cold, possible intermittent spark plug fault/failure when cold? Happened to me once years ago (not a Zed), turned out to be a faulty brand new spark plug. Hey guys. I've noticed recently when my car's cold in the morning under anything more than slight acceleration I sometimes get a slighty lumpy, almost mis-fire kind of feeling that's also noticable on the lift-off when coming to a corner/roundabout/whatever, the car is less smooth than it should be. It's my 2nd Zed and I've never noticed it on my other one, or even this one until recently, so I'm pretty sure it's not normal, but wondered if anyone ahd some advice on what might be the issue or any tests I could do myself to try and diagnose what it is. I know it's had spark plugs fairly recently, oil is clean and at a good level, airbox is clean, no warning lights. I'm at a bit of a loss where to start, to be honest. Had a quick search of the forum but not really found anything similar yet. Cheers! Quote Link to comment Share on other sites More sharing options...
M13KYF Posted November 1, 2011 Share Posted November 1, 2011 Not sure about the OP. I'm using tesco 99. My car isn't bad at roundabouts just idle. aircon on or off Air con off. It's like every 5 or so seconds it's missfiring or about to stall and it goes down then up. certainty not normal. See if it helps with the aircon on. You may have a earthing issue or air filter is clogged up or MAF sensor Quote Link to comment Share on other sites More sharing options...
Ian Posted November 1, 2011 Share Posted November 1, 2011 Not sure about the OP. I'm using tesco 99. My car isn't bad at roundabouts just idle. aircon on or off Air con off. It's like every 5 or so seconds it's missfiring or about to stall and it goes down then up. Mine was like that Was fined after I cleaned my MAF out. Quote Link to comment Share on other sites More sharing options...
Dblock Posted November 1, 2011 Share Posted November 1, 2011 I'm gonna clean my air filter and clean the maf. I got some maf cleaner any idea on how to use it. Quote Link to comment Share on other sites More sharing options...
MattMe Posted November 1, 2011 Author Share Posted November 1, 2011 Good call on the MAF sensor - don't know why I haven't tried that already. I know the filter's nearly new Pipercross effort so don't think it's that. Mine's aircon off, will try with it on also. It doesn't seem to bad at idle most of the time, to be honest. Sometimes drops a little bit but then so did my last Zed. Hope it's not the spark plug thing. That'd be a bit of an arse to diagnose surely? How'd you know which one? Quote Link to comment Share on other sites More sharing options...
Dblock Posted November 2, 2011 Share Posted November 2, 2011 For the price of doing the job if you was to pay it would be cheaper just getting 6 new plugs IMO. I'm hoping to change mine tomorrow. Good call on the MAF sensor - don't know why I haven't tried that already. I know the filter's nearly new Pipercross effort so don't think it's that.Mine's aircon off, will try with it on also. It doesn't seem to bad at idle most of the time, to be honest. Sometimes drops a little bit but then so did my last Zed. Hope it's not the spark plug thing. That'd be a bit of an arse to diagnose surely? How'd you know which one? Quote Link to comment Share on other sites More sharing options...
Dblock Posted November 4, 2011 Share Posted November 4, 2011 Sorry to OP for hijacking I cleaned my filter, cleaned the maf, cleaned the throttle body and changed the spark plugs. Changing the spark plugs is a pain in the backside if you have worked on I4 cars before. Idle is now smooth and the car seems a little more responsive and keener, could be down to the ecu reset and idle control reset thing though. Quote Link to comment Share on other sites More sharing options...
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