Missing and backfire

[BADCSL]

Hi guys.

I am having a problem with my csl as it is missing and backfiring with no power.
The car has not been used much this year and recently when I wanted to drive it, it began to idle unevenly and miss.

I began to think that it was the fuel that lost its power, I then added fresh fuel without draining the old. The problem did minimize but it's still doing the same.

I also noticed that there is a ticking noise when it idles. Sounds like a injector pulsating.

Any ideas guys that can assist me.

Thanks

[shimmy]

Head gasket I would imagine?


Or maybe just the lambda


Have you had the faults read? That and a compression check should find the culprit.

[giraffe]

Would agree with Shimmy but would have to see car to confirm :(

[BADCSL]

off to the agents for checkup.

thanks guys

[AlexGTT]

I'd lay money on head gasket.

[The Gorilla]

Hi,

Calculated Guess at COP issue,
more so if they are Bremi's.

Did you take the plugs out and
see what they were like ?

Badly Fouled plugs suggests Coils
or, water droplets and its pointing
to H/G as others have suggested.

Slim chance of TPS ?

Regards,

The Gorilla.

[BADCSL]

will wait for the outcome.

wouldnt a damaged head gasket will cause it to heat up.

no overheating experienced

u guys are getting me worried

[shimmy]

will wait for the outcome.

wouldnt a damaged head gasket will cause it to heat up.

no overheating experienced

u guys are getting me worried

No as S54 gasket goes between cylinders and not the water jacket so you get pinging and loss of power first

[AlexGTT]

will wait for the outcome.

wouldnt a damaged head gasket will cause it to heat up.

no overheating experienced

u guys are getting me worried

Don't worry. H/G not a big job unless it's driven too far and damaged head.

[DuncanR]

My money on coil packs too ...

[BADCSL]

it was the coil packs and one dead plug

[billyboysm3]

same as I had last week.

[mattCSLnut]

same as I had last week.
What coil packs are U running in your Cecil Billy ? OEM BREMI or replacement BOSCH ?

[billyboysm3]

What coil packs are U running in your Cecil Billy ? OEM BREMI or replacement BOSCH ?

Haven't got a clue. Been busy so didnt get chance to chat to BIG G or Emma about it, just got the call to say collect and under warranty.

[AlexGTT]

it was the coil packs and one dead plug

Did they compression test it as well?

[Equinox]

Why would you need to do a compression test if the coils sorted it out ?

[BADCSL]

Why would you need to do a compression test if the coils sorted it out ?

thats true....

[shane@mbtech]

Why would you need to do a compression test if the coils sorted it out ?

Because those of us with experience do a thorough job.

[Equinox]

Because those of us with experience do a thorough job.

So whenever you get a car in with a misfire you check the compressions, bit pointless.

[shane@mbtech]

So whenever you get a car in with a misfire you check the compressions, bit pointless.

Really.

Well I was trained correctly, and dont just replace parts because you think they need replacing.

Everyone thinks these computers tell you the cause. They read fault codes, that is the effect. I find the cause.

To do a compression test on a car takes no time at all. And knowing the s54, a compression test is a good idea.

[CraigMillwardCroft]

Really.

Well I was trained correctly, and dont just replace parts because you think they need replacing.

Everyone thinks these computers tell you the cause. They read fault codes, that is the effect. I find the cause.

To do a compression test on a car takes no time at all. And knowing the s54, a compression test is a good idea.
+1 :thumbs: Nice to hear some people do other checks rather than rely on what the PC say's

[billyboysm3]

Bosch for the new one and going to do the others in the next couple of weeks.

[shane@mbtech]

Bosch for the new one and going to do the others in the next couple of weeks.

I think I have 6 bosch coils here, probably done 50 miles max, thats 5 0 not 50k.

If anyone wants spares

[O'Neill]

I think I have 6 bosch coils here, probably done 50 miles max, thats 5 0 not 50k.

If anyone wants spares

Mmm pm me a price, ta

[shane@mbtech]

Mmm pm me a price, ta

Ill check tomorrow in my box of goodies.:smokin:

[AlexGTT]

Why would you need to do a compression test if the coils sorted it out ?

Read what Lawsy posted.

Because those of us with experience do a thorough job.

:smt023

So whenever you get a car in with a misfire you check the compressions, bit pointless.

Damn right you do. Not pointless at all, especially with this engine and the use it gets.

[Equinox]

Read what Lawsy posted.



:smt023



Damn right you do. Not pointless at all, especially with this engine and the use it gets.

I was refering to cars in general not just the CSL, in general terms if a car has a misfire and a coil resolves the issue then a compression test is pretty pointless. Ok I see your point re-csl's and common problems but I think any car any of the time to check compressions whenever a car has a misfire is a little excessive.

[CraigMillwardCroft]

It is always nice to know that everything is good inside too, compression give's advance warning if something is starting to go wrong :-D

[shane@mbtech]

I was refering to cars in general not just the CSL, in general terms if a car has a misfire and a coil resolves the issue then a compression test is pretty pointless. Ok I see your point re-csl's and common problems but I think any car any of the time to check compressions whenever a car has a misfire is a little excessive.

Stops customers returning unhappy.

Sometimes, poor compression, coolant blowing out spark, can cause plug to fail and coil to fail prematurely. You replace coil and plug, all seems well for a short period. Customer returns unhappy with "its exactly the same as it was before", which creates a feeling of dissatifaction.

2 minutes to check compression whilst coil and plug is out = no brainer.

And because we are on the csl register, talking about a misfire on a csl, and I know how many csl have poor compression due to iminent failing hg, I was talking about the csl.

[AlexGTT]

I was refering to cars in general not just the CSL, in general terms if a car has a misfire and a coil resolves the issue then a compression test is pretty pointless. Ok I see your point re-csl's and common problems but I think any car any of the time to check compressions whenever a car has a misfire is a little excessive.

As mentioned, it's the work of moments. I'd rather have peace of mind.

It is always nice to know that everything is good inside too, compression give's advance warning if something is starting to go wrong :-D

Quite right. Pro-active maintenance works.

Stops customers returning unhappy.

Sometimes, poor compression, coolant blowing out spark, can cause plug to fail and coil to fail prematurely. You replace coil and plug, all seems well for a short period. Customer returns unhappy with "its exactly the same as it was before", which creates a feeling of dissatifaction.

2 minutes to check compression whilst coil and plug is out = no brainer.

And because we are on the csl register, talking about a misfire on a csl, and I know how many csl have poor compression due to iminent failing hg, I was talking about the csl.

Read above and take note of those with more than a little experience.

[BADCSL]

ok guys. the coil packs have been replaced and one plug...
technician test drove the car and the misfire is gone but now the car begins to jerk
he now suspects that the inlet manifold flat is jammed.
can this flat get jammed and cause the jerk.
what would be the next step.

[Equinox]

Get them to check the compressions :bigcry:

[BADCSL]

Get them to check the compressions :bigcry:

cool, will do:bigcry::bigcry::bigcry::bigcry::bigcry:

[Bounce]

Get them to check the compressions :bigcry:You've changed your tune:hahaha:

[Equinox]

You've changed your tune:hahaha:


if i say anymore power will go to peoples heads and they will come for me

[shane@mbtech]

it was the coil packs and one dead plug

Did they compression test it as well?

Why would you need to do a compression test if the coils sorted it out ?

Because those of us with experience do a thorough job.

So whenever you get a car in with a misfire you check the compressions, bit pointless.

Really.

Well I was trained correctly, and dont just replace parts because you think they need replacing.

Everyone thinks these computers tell you the cause. They read fault codes, that is the effect. I find the cause.

To do a compression test on a car takes no time at all. And knowing the s54, a compression test is a good idea.

ok guys. the coil packs have been replaced and one plug...
technician test drove the car and the misfire is gone but now the car begins to jerk
he now suspects that the inlet manifold flat is jammed.
can this flat get jammed and cause the jerk.
what would be the next step.

I'm saying nothing:smokin:

[Bounce]

I'm saying nothing:smokin:Thats not like you:hahaha:

[Equinox]

Well done youve passed your level one in using the quote facility.....

ill get my coat and leave now... !

[AlexGTT]

I'm saying nothing:smokin:

Neither am I.

[NZ_M3]

Did you scan the car? Did it come back with any fault codes? If so what are they?

I am suspecting it might actually be the vanos control unit that sits under the vanos. The connections on those crack after a while through vibrations and heat cycles - you just need to open it up and resolder all the joints and it should be fine.

Would usually throw multiple codes for misfires and 2 vanos related codes.

[shane@mbtech]

Well done youve passed your level one in using the quote facility.....

ill get my coat and leave now... !

No, please stay, you can learn some more:notworthy:

[shane@mbtech]

And it might have nothing to do with hg and compressions.

But I would most definitely be checking them.

[BADCSL]

went to the workshop this morning.

The mac is telling me that the intake flap is jamming.

The motor on the airbox is turning the flap to open and close but when its closes then it closes to much casuing it to stick.
He made mention that the shaft that holds the flat could be worn out causing it to stick.
He now suggests to remove the flap and sand it down slightly to arrow easy opening and closing.

btw, the computer is no longer showing any faults after changing the coil packs from Bremi to Bosch. told them to change all the plugs as well.

hope this works out...

[alexk]

Did you do the compression test ?

I don't see how a stuck flap would cause misfires to the engine.

[BADCSL]

Did you do the compression test ?

I don't see how a stuck flap would cause misfires to the engine.

its no longer the misfire. the misfire is sorted.

this is a lack of power at certain times and slight jerk.

[shane@mbtech]

went to the workshop this morning.

The mac is telling me that the intake flap is jamming.

The motor on the airbox is turning the flap to open and close but when its closes then it closes to much casuing it to stick.
He made mention that the shaft that holds the flat could be worn out causing it to stick.
He now suggests to remove the flap and sand it down slightly to arrow easy opening and closing.

btw, the computer is no longer showing any faults after changing the coil packs from Bremi to Bosch. told them to change all the plugs as well.

hope this works out...

On one cylinder or them all?

Are you talking about the throttle butterflies or the carbon airbox flap?

At what throttle load?

What revs?

Sport on/off?

[alexk]

its no longer the misfire. the misfire is sorted.

this is a lack of power at certain times and slight jerk.

Hm.
I am not sure you are following the advice of other people here, especially experienced ones. You are asking for opinions and then telling us something else.

Lack of power and being jerky are not really symptoms of a stuck flap.
In my opinion, finalize some things instead of going after new stuff.

Lawsy is asking you about the intake flap because the flap opens at different RPM when sport is on or off.
The BMW GT1 has a test for the flap, your dealer could play with this to actually see if the flap is getting stuck or not.
I haven't heard of a stuck flap that needs sanding down to run smoothly.

[AlexGTT]

:banghead: Get on the phone and instruct them to do a comp test asap.

[alexk]

:banghead: Get on the phone and instruct them to do a comp test asap.

I know where this is going to go !
In the end they will strip out the differential [ as it was another issue ]; they will be puzzled and final strike is going to be the compression test, where they will realize that the flap, microfilter, relay, fuel filter, wheel speed sensor and differential were all fine...
But the headgasket was gone :hahaha:

[hoshy]

Interesting thread... subscribing.

[Bones]

Its a cylinder bore leak down test you want to be doing first :wink:

[Mark CSL]

My CSL was prone to being flat out of junctions and jerky sometimes
after lots of there was no faults they changed the throttle position sensor its the one near the oil filter housing.
Its like a new car again :thumbs:

worth a try

[BADCSL]

My CSL was prone to being flat out of junctions and jerky sometimes
after lots of there was no faults they changed the throttle position sensor its the one near the oil filter housing.
Its like a new car again :thumbs:

worth a try

Mark- you the man..... u are correct.

We changed all 6 coil packs- 2 which was faulty and all the plugs which made the car run better but still had the jerk on certain times.

eventually we just cleaned out the flaP and housing and changed an air temperature sensor that fits on the inlet housing.

picked up the car today and it is running PERFECT.

Thanks for the advice guys.

THE END :supz:

[shane@mbtech]

Mark- you the man..... u are correct.

We changed all 6 coil packs- 2 which was faulty and all the plugs which made the car run better but still had the jerk on certain times.

eventually we just cleaned out the flaP and housing and changed an air temperature sensor that fits on the inlet housing.

picked up the car today and it is running PERFECT.

Thanks for the advice guys.

THE END :supz:

I had the air temp sensor doing that same thing. It was reading something like 40*c.



Glad its all sorted for you bud.

[alexk]

The throttle position sensor and air temp sensor are two very different things.

For the record, our car has 3 throttle position sensors.

[Mark CSL]

The throttle position sensor and air temp sensor are two very different things.

For the record, our car has 3 throttle position sensors.

Yes Alex it has 3 but its always the one on the front that goes the BMW Tec told me :thumbs:

[cantfind1]

Technically 4, as there is one in the accelerator pedal as well.......

[CraigMillwardCroft]

Technically 4, as there is one in the accelerator pedal as well.......
Would that be 5 if you count the foot pressing the pedal :whistle: