Misfire on s3 8p, Random multiple misfire / misfiring across all 4..

[Pistonpete]

Hi, Ive recently bought this s3 8p and Im having trouble with diagnosing the fault. When driving on the motorway and staying at 70mph for a while the engine management light flashes on for 10 seconds or so then disappears. long story short, Ive had Vasstech take a look at it for me and they've pulled up all the fault codes and suggesting having the evap canister and breather valve replaced which cured it for a short while.

Driving it around for another week or so the Enging management light flashes up again and stays on this time and the fault codes that have flagged up on vagcom are the following.

P0300 - Random/Multiple misfire

P0301- Misfire detected on cylinder 1
P0304- Misfire detected on cylinder 4
P0302- Misfire detected on cylinder 2
P0303- Misfire detected on cylinder 3 (80% of the misfire is logged on this cylinder)

can anyone help me or point me in the right direction of why all 4 would be misfiring, the misfire does not cause any sort of loss in power or change the way the car drives. It comes on when the cars been running for a while mainly on the motorway when it sits at a certain speed too long.

Cheers.

 

[NHN]

Common issues are plugs, coil packs that are under a recall from audi, but all 4 at once would denote a common across all 4, loom maybe faulty, not common tbh, but vasstech would check the obvious I'd hope.

 

[Pistonpete]

Common issues are plugs, coil packs that are under a recall from audi, but all 4 at once would denote a common across all 4, loom maybe faulty, not common tbh, but vasstech would check the obvious I'd hope.

Being across all 4 I'm stumped where to look next, Vasstech charge around £50 an hour to look through it all, How would I go about checking the loom myself? Just look for obvious burns or deterioration?

 

[SootySport]

Coil packs have affected just about all VAG petrol cars recently, I wouldn't be surprised if all 4 of yours are playing up, especially if it only happens when they are hot. I would do as you say first and check all the ignition related wiring first. Have a look at all the related connector plug pins carefully for corrosion, looseness.

 

[mjr901]

Check cam follower.

 

[Pistonpete]

Coil packs have affected just about all VAG petrol cars recently, I wouldn't be surprised if all 4 of yours are playing up, especially if it only happens when they are hot. I would do as you say first and check all the ignition related wiring first. Have a look at all the related connector plug pins carefully for corrosion, looseness.

Il. How would I check the coilpacks for deterioration other than signs of blackening or breakdown? Il check plugs and pins tonight too. Thanks

 

[Pistonpete]

Since I got vasstech to clear the codes as the engine management light was stuck on, Ive since managed to get the light to come flash back on then off again re-recording the fault. Vag com does not identify the fault, so Ive rang audi Teesside and they say they use a completley different system which would identify the exact problem with the car and what component is at fault, I dont want to pay another £60 for them to tell me its missfiring across all 4 without telling me the component at fault, anyone work for audi here than can instill any confidence in me here..

 

[Ibisa3]

should we presume you've pulled the plugs/changed them ?

 

[SootySport]

Il. How would I check the coilpacks for deterioration other than signs of blackening or breakdown? Il check plugs and pins tonight too. Thanks

The answer is ----you can't. Do you know if the main dealer has changed them on a recall? The only way to see if they are at fault is by substitution. Apart from that you at the mercy of the main dealer or decent Audi specialist.

 

[Pistonpete]

should we presume you've pulled the plugs/changed them ?

I havent inspected plugs yet but Il take a look. Ive literally just got the car in january 10th this year. Started having trouble with it from the get go and the garage I bought it from are being s#it about fixing it. I need to diagnose the problem first or take it to audi for a diagnostic and full detailed inspection report on whats wrong with it, take the case to trading standards and see where I stand with it all, then hit the garage with a letter from trading standards. If the problem is cheap to fix I dont mind biting the bullet to just repair it.

 

[Pistonpete]

I

The answer is ----you can't. Do you know if the main dealer has changed them on a recall? The only way to see if they are at fault is by substitution. Apart from that you at the mercy of the main dealer or decent Audi specialist.

Ive rang audi and theres been no recalls on the car or notes to have it done.

 

[Ibisa3]

I had a nasty misfire on my 1.8tfsi when i bought it from the garage.
It dropped a cylinder on day one.......

i quickly diagnosed a coilpack, replaced and considered it fixed. Then another misfire developed, at tickover.......
( car supposedly serviced before buying it...)

Pulled the plugs to inspect, and hey presto. Cyl 1 ( same as failed coilpack hint hint) plug was wrecked. end had been eroded right off.

misfire cured......

 

[eagle75_1]

Hi, Ive recently bought this s3 8p and Im having trouble with diagnosing the fault. When driving on the motorway and staying at 70mph for a while the engine management light flashes on for 10 seconds or so then disappears. long story short, Ive had Vasstech take a look at it for me and they've pulled up all the fault codes and suggesting having the evap canister and breather valve replaced which cured it for a short while.

Driving it around for another week or so the Enging management light flashes up again and stays on this time and the fault codes that have flagged up on vagcom are the following.

P0300 - Random/Multiple misfire

P0301- Misfire detected on cylinder 1
P0304- Misfire detected on cylinder 4
P0302- Misfire detected on cylinder 2
P0303- Misfire detected on cylinder 3 (80% of the misfire is logged on this cylinder)

can anyone help me or point me in the right direction of why all 4 would be misfiring, the misfire does not cause any sort of loss in power or change the way the car drives. It comes on when the cars been running for a while mainly on the motorway when it sits at a certain speed too long.

Cheers.

Hi,
I have the exact same problem on my 2008 Audi TT with 2.0 TFSI Engine (bwa code). Have you already solved it? I have tried everything but the Problem still remains.

 

[samuelh_888]

Hi,
I have the exact same problem on my 2008 Audi TT with 2.0 TFSI Engine (bwa code). Have you already solved it? I have tried everything but the Problem still remains.

Hopefully - it’s been 4 years since the post updated.

Assuming you've tried new plugs and coils, do you have the current fault codes?

 

[eagle75_1]

Hopefully - it’s been 4 years since the post updated.

yep, noticed that already.

As I already said, I habe the exact same problem. The fault codes are
p0300
p0301
p0302
p0303
p0304

I already changed the spark plugs. But didnt touch the coils as its very unlikely if not impossible, that any of the cylinder specific parts fail at the exact same time. And if they did, you would definitely feel the engine running rough not idling smooth and loosing power.
But its running perfectly fine, reaching top speed easily.

 

[nluk100]

Have you checked / replaced the usual culprits ... DV & PCV? They are relatively inexpensive and are DIY. Also, has your cam follower been replaced?

 

[ron burgandy]

How hard is it to replace the cam follower?

 

[samuelh_888]

How hard is it to replace the cam follower?

Only takes about 15 minutes - there’s guides on YouTube.

 

[eagle75_1]

Have you checked / replaced the usual culprits ... DV & PCV? They are relatively inexpensive and are DIY. Also, has your cam follower been replaced?

I replaced:

Spark Plugs
Lambda Sensor before Cat
High Pressure Fuel Pump with Cam Follower

Next I‘m going to replace is the fuel filter which was already replaced last year.
After that I‘ll try the knocking sensor but I couldnt yet finde out where it‘s located.

 

[ch1z64]

yep, noticed that already.

As I already said, I habe the exact same problem. The fault codes are
p0300
p0301
p0302
p0303
p0304

I already changed the spark plugs. But didnt touch the coils as its very unlikely if not impossible, that any of the cylinder specific parts fail at the exact same time. And if they did, you would definitely feel the engine running rough not idling smooth and loosing power.
But its running perfectly fine, reaching top speed easily.

Have you by any chance had your timing belt changed , just that I am having a misfire problem on cyl#2 and intermediate misfire 's all over and I recently had my timing done within the last 3months

 

[eagle75_1]

Have you by any chance had your timing belt changed , just that I am having a misfire problem on cyl#2 and intermediate misfire 's all over and I recently had my timing done within the last 3months

Got it replaced by the local audi dealership in 2017. Misfiring Problems started 2 months ago.

 

[ch1z64]

Update on my problem ,I found once I replaced all spark plugs for new and got the Red coils my problem went and hasn't come back so far so good

 

[ch1z64]

Well I thought my problem was solved but not , still getting misfires but now it is only intermediate so where do I begin

 

[doce]

Is there any difference if the aircon is on or off?

 

[nch0]

Any news guys?

Ive bought my s3 few months ago with the exact same issues...

Cruising at around 70mph and Eml blinking... Showing the exact same p0300, p0301, p0302, p0303, p0304

Changed so far:
Plugs, coils, injectors+ decoke(there was loads of carbon build up on the valves), cam chain, pcv valve....

After all that I dont really want to sell a completely serviced car...

 

[desertstorm]

Where are you all getting your plugs from. Be aware there are a lot of fake NGK, Bosch plugs on Ebay and the like. They are poor quality compared to the genuine items and will cause issues. Make sure you buy genuine items.
http://www.ngk-sparkplugs.jp/english/techinfo/fake/index.html

 

[doce]

@nch0

Did you check cylinder head gasket? Also, have you noticed any whitish solids on and around old pcv valve?

 

[ch1z64]

Firstly check coils and plugs . I have recently found out on how to check my timing is ok as this is one cause off misfire / misfires.
Firstly if you have or get get someone to do for you , is go into Vcd's and go to #1 module engine then proceed to measuring blocks # 91 and look at both blocks and your timing should sit around 28kw/28kw @ idle . Then await car to come to temp and then floor the acc pedal ( make sure in neutral ) and see if both blocks move if so timing should be fine . Then you can at least rule that out . Then if you want read up on ( understanding fuel trim YouTube ) then you can check them on vcd's and see if that rules another bit out , then there will be certain pressure testing that can be done for leaks .

 

[nch0]

@nch0

Did you check cylinder head gasket? Also, have you noticed any whitish....

I dont have strange residue in my oil, didnt really noticed any coolant loss.
Didnt saw anything wrong with my old pcv either.

Where are you all getting your plugs from. Be aware there are a lot of fake NGK...
http://www.ngk-sparkplugs.jp/english/techinfo/fake/index.html

First I bought NGK from eurocarparts then few months later amd tuning in essex changed them again(dont know where they supplied them from)

Firstly check coils and plugs .... , then there will be certain pressure testing that can be done for leaks .

First thing was to test the car for vacuum leaks and been told that there are none. Months later amd tuning(essex) said theyve tested fuel pressure and cylinders compression and everything seems fine.

Along the lines Ive changed the fuel filter which looked like it was never changed before (120k miles) and the manifold flaps when the decoke was done...
Recently I saw a topic and people mentioned cranckshaft pulse sensor (my car some times need san extra second to start) was willing to change it myself, how ever I did not found an accurate information of where the sensor is. Does anyone know if theres a way to check if the sensor is not faulty?

 

[ch1z64]

I dont have strange residue in my oil, didnt really noticed any coolant loss.
Didnt saw anything wrong with my old pcv either.


First I bought NGK from eurocarparts then few months later amd tuning in essex changed them again(dont know where they supplied them from)



First thing was to test the car for vacuum leaks and been told that there are none. Months later amd tuning(essex) said theyve tested fuel pressure and cylinders compression and everything seems fine.

Along the lines Ive changed the fuel filter which looked like it was never changed before (120k miles) and the manifold flaps when the decoke was done...
Recently I saw a topic and people mentioned cranckshaft pulse sensor (my car some times need san extra second to start) was willing to change it myself, how ever I did not found an accurate information of where the sensor is. Does anyone know if theres a way to check if the sensor is not faulty?

There is a thing called VCD'S which you can buy from a genuine outlet @NHN supplier and then register it with Ross- tech .com and there is heaps off info

 

[Jason Riley]

Hi my cars recently started misfiring started on one cylinder so swapped coil packs over then it went to different cylinder so I replaced spark plugs for ngk iridium ones and it's still misfiring on all cylinders what's next to try fixing?

Thanks

 

[samuelh_888]

Hi my cars recently started misfiring started on one cylinder so swapped coil packs over then it went to different cylinder so I replaced spark plugs for ngk iridium ones and it's still misfiring on all cylinders what's next to try fixing?

Thanks

If your swapped coils and the misfire moved then it’s likely the coils are breaking down. Maybe look at replacing the coils.

 

[Jason Riley]

If your swapped coils and the misfire moved then it’s likely the coils are breaking down. Maybe look at replacing the coils.

Thanks that's what I will be doing going for the red r8 coils Ngk