Chris6t9 Posted November 23, 2012 Share Posted November 23, 2012 Hi guys, not a supe but if anyone could shed some light on where i start i would be greatfull. Basically a few days ago my girlfriends 1.4 mg zr started misfiring. This only happens in low gears and ONLY when the car is warm. I replaced the spark plugs today and the coil pack was replaced not so long ago before this problem came into existence. Where else do i start looking/replacing parts. I'm hoping someone on here has had one and knows where to start :s Quote Link to comment Share on other sites More sharing options...
Benjy Posted November 23, 2012 Share Posted November 23, 2012 *cough* Head gasket *cough* More of a feature than a fault. Check the oil on the end of the dipstick. If it's clear, check the HT leads but just as a matter of course I'd get a block test done mate Quote Link to comment Share on other sites More sharing options...
Chris6t9 Posted November 23, 2012 Author Share Posted November 23, 2012 Yea i know they do tend to go but i don't think that would cause misfiring would it? Ok ill take it/bump it down the road to the garage tomorrow. Cheers ben Quote Link to comment Share on other sites More sharing options...
Benjy Posted November 23, 2012 Share Posted November 23, 2012 Yeah it would. If it loses compression it'll misfire, if antifreeze or oil leak into the cylinder it'll cause the plug to fire poorly... As I say, on a K-16 lump, the first thing I'd do is a block test. Mainly because they're notoriously made of cheddar. Quote Link to comment Share on other sites More sharing options...
wile e coyote Posted November 23, 2012 Share Posted November 23, 2012 As above head gasket sorry Quote Link to comment Share on other sites More sharing options...
Chris6t9 Posted November 23, 2012 Author Share Posted November 23, 2012 Bollocks lol, the just been done like 8k miles ago. Bad times . Guess ill just have to buy her a new car. Cant be doing a head gasket every 8k miles! Quote Link to comment Share on other sites More sharing options...
wile e coyote Posted November 23, 2012 Share Posted November 23, 2012 You could try an additive then get shot of it Quote Link to comment Share on other sites More sharing options...
Guest ugp Posted November 23, 2012 Share Posted November 23, 2012 Hold up a minute. Don't just assume it's the head gasket because someone says it is without looking at it. You said a coil pack had been replaced, there are two of them. The symptoms you're describing, do they only happen when the engine is loaded up under heavy ish acceleration? Quote Link to comment Share on other sites More sharing options...
Chris6t9 Posted November 23, 2012 Author Share Posted November 23, 2012 (edited) Hold up a minute. Don't just assume it's the head gasket because someone says it is without looking at it. You said a coil pack had been replaced, there are two of them. The symptoms you're describing, do they only happen when the engine is loaded up under heavy ish acceleration? It literally has no problems at all until its warmed up so been running 5 - 10 mins which makes me think it cant be the head because it would do it even when its cold, or am i wrong? I'm no mechanic Only does it in low gears when warmed up, When you hit 4th and 5th it seems to be fine when warm. And sorry i meant coil packs not coil pack, so both have been replaced. Also to add it blips slightly when idling. Edited November 23, 2012 by Chris6t9 (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris6t9 Posted November 23, 2012 Author Share Posted November 23, 2012 Also makes this strange clicking noise if you can hear this. Could this be anything electrical that could cause the problem? Quote Link to comment Share on other sites More sharing options...
Benjy Posted November 23, 2012 Share Posted November 23, 2012 Mate that sounds like a diesel!!! Quote Link to comment Share on other sites More sharing options...
Chris6t9 Posted November 23, 2012 Author Share Posted November 23, 2012 Mate that sounds like a diesel!!! HAHA! Well i can assure you mate its petrol Quote Link to comment Share on other sites More sharing options...
Benjy Posted November 23, 2012 Share Posted November 23, 2012 I can see it's a petrol but that doesn't sound healthy dude Quote Link to comment Share on other sites More sharing options...
Guest ugp Posted November 23, 2012 Share Posted November 23, 2012 The injector tick is pretty normal on them. I would check that the garage that replaced the head didn't use black mastic / rtv sealant on the cam cage. They should have used face to face sealant of which oil can dissolve, therefore not blocking the oilways to the cams. What isn't normal is the missfire it's got, I heard it a few times during the clip. You're looking at something ignition / electrical related. What condition are the fly leads to the other two pots like? Assuming you've done a compression test? What usually happens after the heads blow is they get skimmed but the valve seats don't get checked. Usually ending up with low compression in one or more cylinders. If it's not the plugs / leads / coilpacks it'll be the cam sensor, again a common one, especially after it's cooked. - - - Updated - - - I can see it's a petrol but that doesn't sound healthy dude The camera is picking up a lot of the high frequency noises and amplifying them. If I record my silky smooth v8 and play it back, it sounds like a GM 3 pot! Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted November 23, 2012 Share Posted November 23, 2012 First off, get her to buy her own car! Second, Id say its ignition based. Was it a brand new Rover sourced coil or from a scrappy's? Quote Link to comment Share on other sites More sharing options...
Chris6t9 Posted November 23, 2012 Author Share Posted November 23, 2012 The injector tick is pretty normal on them. I would check that the garage that replaced the head didn't use black mastic / rtv sealant on the cam cage. They should have used face to face sealant of which oil can dissolve, therefore not blocking the oilways to the cams. What isn't normal is the missfire it's got, I heard it a few times during the clip. You're looking at something ignition / electrical related. What condition are the fly leads to the other two pots like? Assuming you've done a compression test? What usually happens after the heads blow is they get skimmed but the valve seats don't get checked. Usually ending up with low compression in one or more cylinders. If it's not the plugs / leads / coilpacks it'll be the cam sensor, again a common one, especially after it's cooked. - - - Updated - - - The camera is picking up a lot of the high frequency noises and amplifying them. If I record my silky smooth v8 and play it back, it sounds like a GM 3 pot! Nope not done a compression test but will take it to the garage tomorrow, and i wouldn't know what the garage did that done it as that was with the previous owner. I'm not very mechanically minded and only know the basics so i guess this would be something i cant really look at myself if it involes the head gasket Quote Link to comment Share on other sites More sharing options...
Chris6t9 Posted November 24, 2012 Author Share Posted November 24, 2012 First off, get her to buy her own car! Second, Id say its ignition based. Was it a brand new Rover sourced coil or from a scrappy's? Sorry i missed your replay mate, it was brand new from rover. I hope your right and it is mate Quote Link to comment Share on other sites More sharing options...
Tyson Posted November 24, 2012 Share Posted November 24, 2012 The injector tick is pretty normal on them. I would check that the garage that replaced the head didn't use black mastic / rtv sealant on the cam cage. They should have used face to face sealant of which oil can dissolve, therefore not blocking the oilways to the cams. What isn't normal is the missfire it's got, I heard it a few times during the clip. You're looking at something ignition / electrical related. What condition are the fly leads to the other two pots like? Assuming you've done a compression test? What usually happens after the heads blow is they get skimmed but the valve seats don't get checked. Usually ending up with low compression in one or more cylinders. If it's not the plugs / leads / coilpacks it'll be the cam sensor, again a common one, especially after it's cooked. - - - Updated - - - The camera is picking up a lot of the high frequency noises and amplifying them. If I record my silky smooth v8 and play it back, it sounds like a GM 3 pot! I had a ZR 160 and the previous owner / garage did this, was an awesome car but then it let go on some spirited driving down a country road in the middle of a tiny village in the sticks. It was never right after that as it get kept mixing but never overheated, had a slight misfire evenafter the HG change. My dad's mate told me the block was scrap as the the head had been skimmed before and the head was pretty warped, I loved that car Used to go like stink and handle like a go kart I scared myself at how fast I could go round corners Quote Link to comment Share on other sites More sharing options...
Chris6t9 Posted November 24, 2012 Author Share Posted November 24, 2012 Ah that does look lovely mate! Still not figured out what it is, im thinking about changing the coil pack and leads first off and work my way through. Might even be the injectors. It ran like a dream earlier, we drove it for 45 mins and even when warm it was perfectly fine. Then went out later in the day again a few hours later in it and it started playing up again. Cant be the HG. Coolant is fine still and if it was it wouldn't have been fine the first time round. Maybe some damp is getting in there or something idk. Garage couldn't fit us in for a block test till Monday, when were both back at work, and i refused to take it to quick fit! Quote Link to comment Share on other sites More sharing options...
Guest ugp Posted November 26, 2012 Share Posted November 26, 2012 Ah that does look lovely mate! Still not figured out what it is, im thinking about changing the coil pack and leads first off and work my way through. Might even be the injectors. It ran like a dream earlier, we drove it for 45 mins and even when warm it was perfectly fine. Then went out later in the day again a few hours later in it and it started playing up again. Cant be the HG. Coolant is fine still and if it was it wouldn't have been fine the first time round. Maybe some damp is getting in there or something idk. Garage couldn't fit us in for a block test till Monday, when were both back at work, and i refused to take it to quick fit! Try and get a video of it playing up, I'll be able to work out what's going on more then. Quote Link to comment Share on other sites More sharing options...
Chris6t9 Posted November 26, 2012 Author Share Posted November 26, 2012 Try and get a video of it playing up, I'll be able to work out what's going on more then. I just bought some new leads and will fit them tomorrow or wednesday. Going for the trial and error technique lol. If it still happens when i have fitted them then ill be sure to get a video up when its doing it on idle. Also to add its now getting worse. It now does it also when its cold and also when in high gear now as-well (so basically all the time) Quote Link to comment Share on other sites More sharing options...
edd_t Posted November 28, 2012 Share Posted November 28, 2012 sounds similar to what i had with the k series in my mgf. i check HGF, coilpaks, sparks, leads etc etc, no help at all. then change the lambda and cooland sensors and hey presto all happy again Quote Link to comment Share on other sites More sharing options...
Chris6t9 Posted November 28, 2012 Author Share Posted November 28, 2012 Seems to have sorted it! Quote Link to comment Share on other sites More sharing options...
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