[tysnappy]

Hi Guys

Going to give you a quick overview of the past couple of weeks.

Bought car about a month ago, after a week It randomly started misfiring heavily, whole car was shuddering if I went over 30 mph (think this is limp mode?) and the yellow check engine light came on. After about 10 mins I pulled over turned engine off for 5 mins and set off again, and there was no issue.. all seemed fine for a couple days, and then it came on again randomly. So I took it to BMW specialist mechanic (indy) and he said diagnostics came back with variable misfire (multiple cylinders) he said it needs new coils and sparks.

So I had all 6 of each replaced. (6 new coils & spark plugs)

Was fine for a day, and then it misfired again on the motorway. So the next day I took it back and told him. He said it came back with injector fault and so he recoded/programmed that injector and said all seemed fine.

So I took it for a drive and was fine for a couple of days... and then boom back again!!!! So I took it to BMW who said that there was an injector issue on this model and I could have the faulty ones which will all need replacing.

Anyway I took it back to the indy and asked him to check diagnostics and low and behold Misfire on Cylinder 2. He said it will be injectors and that I should replace all 6. (fuck my life) ... anyway so I said lets just do the one now as I couldn't afford to fork out another 2 grand! .. so I had the injector replaced yday.

I noticed in the morning on cold start it seemed like it was misfiring when idle worse than before (not bad, but I could feel it) ... It shudders a bit every now and then (maybe im just being paranoid) and not sure if I can hear misfire by exhaust sound when im driving (again maybe im just dreaming it)

Ive checked the exhaust and on cold start doesn't seem to be any moisture, however if I rev it a bit and check again it looked like some moisture on the left exhaust pipe (possibly fuel??).. Took it for a drive and hammered it a bit and then checked exhaust again and both exhausts looked quite wet (water or fuel?, I tried dabbing with a paper towel to see if I could smell fuel - which I could not)

Ive driven it quite a bit and tried gassing it a bit too and no lights or misfire when driving. However im just a bit worried that it is still misfiring? or that injectors are leaking. If so ive been told not to leave it long as it can fuck the cats up?

Anyone have any idea what this is?? .. The only real symptom now is a bit of intermittent shuddering when car is idle, however im driving it like a granny as im scared It will fuck up.

Please let me know your thoughts

Thanks!
Tom

[deeLow]

What year?

Could be more than just the one injector. Could be massive carbon buildup on the valves. Could be a bad DME maybe. <---not 100% sure on that as I would assume you also get DME codes.

[GSEN820]

I would say make sure the connection on the coil packs are pushed all the in.....I had replaced mine only to realize one was still loose.....coil packs can be stubborn....

[tysnappy]

Originally Posted by deeLow

What year?

Could be more than just the one injector. Could be massive carbon buildup on the valves. Could be a bad DME maybe. <---not 100% sure on that as I would assume you also get DME codes.

Thanks for your reply buddy.

Would the faulty injectors not have all shown up on the diagnostic tool? or are these tools sometimes unreliable?

The guy im taking it too is a BMW Specialist, however maybe im better just biting the bullet and taking it to the BMW Dealer for diagnostic (£200!!)

If it is a carbon build up, how can I check or resolve this?

Also am I risking it by keeping driving on it?

EDIT: Sorry missed off age .. its a 2007 with 80k (miles)

Cheers
Tom

[tysnappy]

Originally Posted by GSEN820

I would say make sure the connection on the coil packs are pushed all the in.....I had replaced mine only to realize one was still loose.....coil packs can be stubborn....

Thanks for reply

Should I try this myself? Wish I had done the full replacement of coils and sparks myself as I could have got parts much cheaper.

Do you think the garage would have done that? bit of a piss take if they're doing simple stuff like that incorrectly.

[GSEN820]

This is something you can check yourself.....My car would run fine for a day or two then start misfiring....then go back to normal....Couldn't figure it out for the life of me....I took to a friend who is a BMW Mechanic and he laughed said this was common for DIY'ers.....

I would start there with your connection......

[tysnappy]

Originally Posted by GSEN820

This is something you can check yourself.....My car would run fine for a day or two then start misfiring....then go back to normal....Couldn't figure it out for the life of me....I took to a friend who is a BMW Mechanic and he laughed said this was common for DIY'ers.....

I would start there with your connection......

Ill give that a try (really hope it is that, all I need now is for the fuel pump and turbos to go haha)

Will it be obvious if one is loose or is it something I need to torque up to a certain level?

Cheers!
T

[deeLow]

Could absolutely be the coil connections as well..they are tricky for sure if you're not fully aware.

I have a slight misfire, cylinder 3. Sometimes it happens and registers a code but never triggers the CEL. Sometimes after a few weeks I find a randomly stored misfire code for that cylinder. I know it's the injector here as it's slightly leaky and causes a long start on occasions.

As for the carbon buildup, only way to check is pull the intake manifold.

[deeLow]

Originally Posted by tysnappy

Ill give that a try (really hope it is that, all I need now is for the fuel pump and turbos to go haha)

Will it be obvious if one is loose or is it something I need to torque up to a certain level?

Cheers!
T

The coil packs just sit on the plugs. They push down all the way(you'll know) and the connectors clip in and then are held with a fancy type of retainer. If you're looking at them it would be pretty easy to tell if the connector isn't locked all the way

[tysnappy]

Originally Posted by deeLow

The coil packs just sit on the plugs. They push down all the way(you'll know) and the connectors clip in and then are held with a fancy type of retainer. If you're looking at them it would be pretty easy to tell if the connector isn't locked all the way

Cheers for this, Ill give it a try this weekend and see If I can spot anything.

I think ill get one of those code readers, any recommendations on which one to get?

[tysnappy]

So is the moisture in exhaust not worrying?

[tysnappy]

Update:: just been on an hour motorway drive and misfire/shaking seems worse at idle..... Is this narrowing anything down?

[Bavarian Tech]

You CANT mix index of injectors, 11 and higher must be installed on the same Bank.

[tysnappy]

Originally Posted by Bavarian Tech

You CANT mix index of injectors, 11 and higher must be installed on the same Bank.

Ahh i see... Is this going to cause any damage if i wait a few weeks? Or does the bank need replacing immediately?

Cheers
Tom

[tysnappy]

Hi All

So this weekend i thought id check that the coil packs where all clicked in correctly, when taking off the engine cover I noticed quite a bit of oil around the coils see pictures. Not sure if its an overspill from when the garage changed the oil, or if there is an issue?








Is this oil a problem? could it be causing rough idle if there's some oil on the spark plugs.. Maybe I should try removing sparks & cleaning?

Cheers
Tom

[vapore0n]

It most likely means that the spark plug portion of your valve cover gasket is leaking.
Expect to replace the valve cover gasket at the same time too.

[///Mposter]

Whoever topped your oil off spilled it and touched the coil afterward. You can see the evidence in picture 1 you posted. It's wet with oil above where the filler is and the square catcher below it is also covered and then it leaked down the side and into all those areas.

[tysnappy]

Originally Posted by ///Mposter

Whoever topped your oil off spilled it and touched the coil afterward. You can see the evidence in picture 1 you posted. It's wet with oil above where the filler is and the square catcher below it is also covered and then it leaked down the side and into all those areas.

Okay guessing this is nothing to worry about then.

Cheers!
Tom

[tysnappy]

Hi Guys

The dreaded misfire is back! Plugged my diagnostics in and it came back Misfire detection in cylinder 3 in 2 firing order 0029CF.

Does this shed any light? Do you think its c3 injector?

Cheers
Tom

[sk55]

you could have ur indie move the injector to cyl 1, do a swap. see if it still misifires...then you know the injectors the problem..

did u try some fuel injector cleaner like lucas or techron.

are you using stock bosch plugs?
i feel your pain i had misfires on 2 cylinders yesterday limped to work.
fortunately it was just the coils and limped home.

i ended up changing all the plugs and coils.

[BashShah]

Are you tuned?
Do you have after market intake or not?
When was the last time a Walnut blast was done?
Were your Vanos Solenoids Cleaned and swapped or replaced?
Have a look at your battery, is it OEM?

DN

1+ on above, move coil and plug to a non faulting positions.
Meaning moving coil and plug to two different positions.

[tysnappy]

Hi Guys

Just had cylinder 1 injector replaced because of misfire and also had all coils and sparks replaced 2 weeks previous.

Can I just move injectors around? I was under the impression you had to code them? And also re-prepare them once youve taken them out.

Car is 100% stock not sure what brand plugs my indi used but hes a bmw specialist so guessing he would have used a reputable brand.

Do you think it could still be coils or sparks even if theyre almost brand new?

Cheers
Tom