A bit of a misfire between 2-3K rpm

I was just thinking about asking you if it would be ok to pop up and try your MAF mate, I've got that turbo outlet to intercooler gasket on order that should be coming Friday, that could well be my problem because there isn't one at the moment.

If its ok I'll pop up after I've fitted that gasket and borrow your MAF if you dont mind me pinching your MAF for a minuet? Lol

Feel free, I'll pm you my phone number

I have just had a play about with the car today, I unplugged the O2 sensor and started the car but that didn't make much difference so I plugged it back in. I unplugged the MAF and started the car and it ran really rich, AFRs at idle were in the 10's but the car seemed to idle better and I didn't notice any misfires at idle. I switched the engine off and reconnected the MAF and the car does seem to be running better now, AFRs at idle in the 13s but no odd misfire at idle like before but it still misses at partial throttle when you hold it around 2k rpm but its only a slight misfire, it's not like it's running on 3 cylinders just like its missing every now and then.

Seeing as the car was idling ok I decided to try getting the idle were it should be with the idle adjust screw, I got the car to idle at about 1100 rpm but then I realised the idle adjust screw had run out of adjustment and was screwed all the way in!
I took the car for a drive and AFRs seemed fairly good, nothing out of the ordinary but when I returned home the idle had rose back up to about 1400 rpm so perhaps my IAC or AAC or whatever the hell it's called valve is fooked?
I do think my high idle and miss fire problem could very well be connected, the missfire did seem to get better after I unplugged the MAF and the plugged it back in again but I hasn't gone away

Right I've been out playing about with the car today, I've changed the fuel filter for a new one and replaced the leaky pipe going to the filter, there doesn't appear to be any leaks.

I started the car and now it idles like a bag of shit, AFRs are high at idle, in the 16's 17's region and idle is lower than normal and lumpy.

The car has got much worse since I have done the fuel filter but I can't see it being anything to do with the filter itself.

I disconnected the MAF and it idled fine but rich as hell (which I suppose is normal with no MAF) it was sitting between 9 and 11 with the MAF unplugged.

I'm starting to think its a MAF issue but I don't think it's the MAF itself but the MAF plug because the wiring to the plug looks very sketchy

The only other thing I can think of is I've disturbed some wiring when I've been working around the fuel filter or it could be a leak in the boost pipes because I've had the pipe that goes to the inlet off to get to the filter.

I wish I'd ov just took it to the fookin garage for them to look at because I don't want to drive it now because it's as lean as hell

Darren says I can borrow his MAF to try that so I will ask him if I can borrow that and give it a try but failing that I don't know what to do with it, I need to be getting something sorted soon the because the RR day is rapidly approaching and I don't want to miss it because I missed the last one

I may possibly be going to brum next week to pick up a car, if I do il stop at yours on the way back and have a look at it for you.

Try Darren's afm on it to see if that makes any difference, if not then locate the earth wire on the plug and splice into it and solder another piece of wire on and run it to a good ground on the body to see if that solves it.
If not then drop me a pm and il pop over on my way back but you best have tea and biscuits waiting or I go on strike lol

Thanks bob your a life saver.

I've got Darren popping round tomorrow with his car and were going to try swapping over the MAF and a few other things.

If we can't fix it and you don't mind popping up then I will make sure I've got plenty of tea biscuits and cake lol

Can't thank you enough for offering to come and have a look at it for me bob

No problem bill, I should know by end of tomorrow what day il be picking the other car up (unless he changes his mind) so il pm you and let you know as soon as : )

Thanks mate, really appreciate it. Hopefully you won't have to come and have a look because me and Darren might be able to sort it tomorrow.

If your ever in the area Bob your more than welcome to stop off at my house for a tea break anytime matey

I've had Darren round today helping me try a few things on the car.

The reason it ran like a bag of poo after the filter change is because I pulled a vac pip off the carbon filter   But it was still misfiring

We have narrowed it down the the rotor arm so I'm going to order a now rotor arm and dizzy cap and hopefully all will be hunky dory.

Thanks for offering to nip up bub but it looks like we have solved it so that's saved you the journey.

Big thanks to Bones for coming round to swap bits over and bob for offering to come round and take a look

If it don't work bill let me know by Monday as the offers still there if needed    but hopefully it will work

Cheers bob your a top bloke!

Nice little motor that bill

Bones wrote:Nice little motor that bill

Thanks buddy, yours is a corker too, nice clean genuine original car is yours matey   

Changed my dizzy cap and rotor arm and she's still misfiring   I really thought that was going to be it too.
I think I'm going to book it in at a garage for them to look at because I'm not getting nowhere with it. I don't think they will charge me much just to look over it so I might aswell get them to have a look for me

want me to pop in Monday on my way back still?

If you would bob that will be great, I'll see if I can take it to the garage I use tomorrow and get them to check it over because they won't charge me much just to have a look. It could still just be a boost leak and they might be able to pressure test it for me.

If I don't have any joy with it or if they are too busy to have a look this weekend then if you could pop up bob that will be amazing.

The thing is though it drives fine it just has the odd miss at idle and at partial throttle when stationary and I don't want to make you come out of your way when it would probably be ok to drive it to the RR day.

I'll keep trying a few other things over the weekend and see if I have any luck but i don't know what to check next. It could be absolutely anything lol

Not sure id worrie about it to much bill as it's only the slightest splutter at low revs but it's yr car mate

I'm just super duper paranoid mate lol I'm going to get some new plugs I think because my gap maybe a bit small, it did seem to run pretty smooth with your plugs.

It's just. Bitch because it seems to miss when it wants, you do something and you they 'yeah that's it, sorted ' but then it starts missing again lol.

If you know the guy at the garage and your sure he's not gonna charge you a lot then nip it up there to see what he thinks but my guess is he won't really be interested as easier money is made elsewhere

I'm not gonna charge you a bean other than tea and biccies for me and dangerous Dave who will be with me.

It could be a number of things causing it so il bring a few bits up if you want us to take a look, il only have around an hour or so but you'll be amazed at what the Jedi master can sus out in that time   

Thanks bob. The guy at the garage is a friend of the family, he's not going to exactly do something for nothing but they might be able to take a quick look at things and they will be better then me because I'm a mechanical retard lol

I just feel cheeky getting you to come out of your way just to look at my car lol but if you do I'll make sure you get plenty of tea and biscuits and anything else you could want lol.

I might just take it down to that garage tomorrow and ask him just to give it a quick look over because you never know could be something really simple that I've missed.

I'll keep at it swapping little bits over hear and there to see if I get anywhere with it and Ill keep you posted mate.

Have you got my address bob or do you need me to pm it you?

Thanks a lot mate

It's really no trouble bill
If I didn't want to do it I wouldn't have offered lol

We've got to go to Dudley in brum so just a slight detour on the way back.

I know your in Mansfield area but yeah pm me your postcode etc if it's not sorted by sunday

Cheers buddy, I'll keep at it, theres still a few bits I could potentially swap over etc and I could do with getting someone to check the timing for me because I've never done it and I haven't got one of those timing light gun thingys lol

I took the R for a little drive round today and I'm beginning to think its not the bad lambda sensor causing my misfire. I noticed when i rev the car with no load at partial throttle all the way up to just over 3000rpm it still has a miss and I understand the lambda is redundant after 2k rpm?

I hav however noticed when driving and coming on boost it feels as though the car is holding back a little. It more at partial throttle, when not in boost it feels fine but when it starts to come on boost you can feel it holding back a little. When you put your foot right downt it seams to go fine it's just the transition between off boost and on boost it feels as if it's holding back a little.

I have had a look round all my boost pipes and I have noticed the pipe that goes from the intercooler through the pasenger side dose not look to clever, were the little silicone hose coupler thing goes through the arch the metal looks a bit rough and jagged and the silicone hose has started to fray.

Do you think a boost leak could be causing my misfire?

I'm yet to fit the lambda sensor but like I say I'm beginning to think that will not cure my problem.

Looks like I may need to get some new silicone hose

This is what I'm talking about

yep that doesn't look to clever bill so obviously check the system for any slight boost leaks as that will hugely interfere with afr's

the lambda could still cause a problem though as although it goes into open loop after around 2k it still monitors fuelling at lower rpm so if its not working in affect you could have too much fuel as you come onto boost initially whch culd bog the car down and cause misfires as too much fuel will give a crap burn rate so don't yet rule out the lambda until its changed, but by all means check all those boost pipes