My mk2 VRS will misfire while accelerating but no warning lights or error codes appear. I previously had the same problem, changed the sparks and ignition coil, which seemed to sorted it for about a month.

 

the problem is now back, talking to a technician they think it could be the injectors on there way out.

Has anyone else had the same problem? and do anything to fix it?

 

(It does have a stage 1 remap if you need this information)

Which stage 1 remap does your car have?

Edited 25 April, 201412 yr by Ally_bassman

Did the Technician not say that the misfires did not register because there were not enough in one cycle?

You would hope he knew things like that.

 

Is it by chance a REVO stage 1 map? 

Then that would be the problem.

What spark plugs are in it?

& do you always run it on 98 or 99 ron?

 

Best have the spark plugs checked again,

Cylinder 3 first.  But all 4 need removed and checked.

 

george

 

http://briskoda.net/forums/topic/236809-revo-stage-1-in-a-vrs-and-misfires

http://briskoda.net/forums/topic/206191-remap-for-mk2-vrs

Post 13 worth a read while taking a drink of Tequila with a pinch of salt.

 

REVO tells dealers not to Map if there is misfires,

they fail to mention that once Mapped you are likely to get Misfires with a REVO map.

Best to check condition of the plugs again and do a compression test

<snip>

Do you always run it on 98 or 99 ron?

<snip>

Where can one buy 98 RON petrol in the UK?  I thought it was an entirely fictional fuel and one had to take either 95, 97 or 99?

As you know the recommended fuel by Skoda/VW is 98 ron,

 (and stage 1, lower RON is going to cause problems.)

and since i asked 'Do you always run it on 98 or 99?'

that would have to be 99 he uses if there is no 98 available.

 

Are you going to stop the wind up if your interest in vRS's are just your way of messing owners about?

To repeat the question - "Where can one buy 98 RON petrol in the UK?"

 

As a follow-up, would 20L of 97 RON and 20L of 99 RON be 40L of 98 RON?

 

Perhaps you could tell me where I might buy 99 RON within 30 miles round-trip of Keswick (clue: I can't)

Just run 97 ron then if fuel is not available in your area and you can not fill up when in the area with the fuel you need. Gem Derwent Service Station.

do you have a car that needs or benefits from 98 ron?

 

Plenty of 'which petrol threads for a vRS, some you have posts in,

or which fuel is best without Hi-Jacking this one.

Thanks for the replys - ive always run my car on shell vpower and it has been stage one remapped by AMD tunning since 22k miles its now 67k and only just having the problems in the last month, the sparks are the uprated ridium ndk ones, tbh he said that renewing the sparks again and changing the ignition coil should sort the problem which it did for about 1000miles, but the sparks wouldn't need changing again and the only other thing he thinks he could be is injectors on there way out :s which im hoping its not as that be a bit expensive as obviously no warranty left.

A condition check of the spark plug will give you an idea of what may be happening, by visually inspecting the plugs you may gain more info on whether overfuelling, carbon fowling etc.

George, do you (or anyone else) actually know whether 20L of 97 RON and 20L of 99 RON would be 40L of 98 RON (which doesn't actually appear to be available in the UK) but is claimed to be the correct fuel to be used in a Fabia vRS?

My mk2 VRS will misfire while accelerating but no warning lights or error codes appear. I previously had the same problem, changed the sparks and ignition coil, which seemed to sorted it for about a month.

 

the problem is now back, talking to a technician they think it could be the injectors on there way out.

Has anyone else had the same problem? and do anything to fix it?

 

(It does have a stage 1 remap if you need this information)

 

i'll try and help here.

i used to own a citroen C1 which would constantly missfire and eventually blow coils, i changed plugs, loom, and coils. i would like to say in the 4 years i owned it for i blew around 35+ of them, the first handfull were bought new (£70 per coil and i needed 3!) i eventually started buying used coils of cars being broke. i literally would keep 3 spare in my car and toss the dead one when i changed it at the side of the road. auto electricians didnt know what the issue was so it was a biggy..

 

anyway before i sold my car i realised why i had been having my missfire issues.

 

it was because i had installed a massive sub and amplifier, on a standard old, warn battery.

 

what im saying is dont always think its mechanical it could be as simple as needing a new battery, loose alt belt, etc. 

 

anyway thats my input, it could help, it may not, but its worth keeping a record of these things especially when i have dealt with them first hand.

<snip>

it was because i had installed a massive sub and amplifier, on a standard old, warn battery.

<snip>

Clearly not the first solution one would look for with an ignition problem!

 

You say that you discovered this before you sold your car; did you install a new battery or disconnect the Amp and Sub to resolve the problem and are you certain that they were the problem?

anyway before i sold my car i realised why i had been having my missfire issues.

it was because i had installed a massive sub and amplifier, on a standard old, warn battery.

what im saying is dont always think its mechanical it could be as simple as needing a new battery, loose alt belt,

I'm not technically minded enough to see the link between a duff battery and an engine misfire. Would you mind explaining for me please?

Clearly not the first solution one would look for with an ignition problem!

 

You say that you discovered this before you sold your car; did you install a new battery or disconnect the Amp and Sub to resolve the problem and are you certain that they were the problem?

 

Actually, i blew my sub, left uni and got a well paid job so uprated everything, 2600watt amp 2000watt sub, japanese kenwood pod speakers, which were 250watt rms each! uprated fronts etc. once everything was ran in i noticed my lights would go dim and start to flash, and my car would miss on all cylinders when the sub hit violently. it was like a very harsh ignition cut. like hitting a wall. 

 

i got a battery double the capacity and double the ohms and everything was fine. ran great, prior to selling the car i removed everything the car ran **** hot must have been due to less current being drawn from the engine.. seriously at least another 15hp gain haha, thats a lot when the car only ever had 60!! 

I'm not technically minded enough to see the link between a duff battery and an engine misfire. Would you mind explaining for me please?

 

i could not tell the difference, read the above post. if you have a missfire, you have a missfire, you just need to find out what is causing it and fix that issue. for me all i needed was a giant battery out of a family estate car.

 

get yourself to halfords and get them to do a battery health check, i think theyre free?

 

im sorry if this doesnt help, i know it can be very time consuming and even more frustrating :(

Edited 12 May, 201412 yr by matthewl

Out of interest, are you getting these misfires under all conditions?  Or is it predominantly when you start getting the engine very warm? Heat has an impact on misfires.  We don't talk much about uprated IC's on here anymore but I think for Stage 1/2 cars the extra flow and lowering of intake temps could be a nice performance gain but also help out reliability issues.  I am starting to think that Stage 1+hardware or full stage 2 could be a healthier state of tune than Stage 1 on the 1.4 twincharger.

 

Do you have a Dyno Graph set from the remap, I would be interested to see what their map looks like.

 

Which NGK BKR plugs do you have in 6's,7's,8's.  This will have an impact, you may be better with a cooler plug and slightly lumpier idle but no misfires.  Definitely visually inspect the condition.

 

Do you have a Forge DV or similar fitted?  Messing with the metered air and potentially fuelling ratios?

Out of interest, are you getting these misfires under all conditions?  Or is it predominantly when you start getting the engine very warm? Heat has an impact on misfires.

 

Do you have a Forge DV or similar fitted?  Messing with the metered air and potentially fuelling ratios?

 

good info here!

DV's make the mixture run very rich, that can be an issue, or not helping an issue.

My missfires were never there when cold, but once the engine was hot, it would always miss when i was at WOT for long periods of time, high and low RPM. and eventually blow a coil, sometimes to pieces, which which can be annoying fishing pieces of plastic out of a cylinder at the side of the road when the engine was red hot haha :(

Edited 12 May, 201412 yr by matthewl

Mathewl,

on my way to Dyce for 2.30 PM if you are around that area.  In a vRS.

 

Without a Mis-fire, which is surprising,

because i was greedy and put in 40 Litres of Shell V-Power Nitro on a Business card,

and the car has run like sharn since.

So by the time i get to Aberdeen, it will be used up and get some Tesco Momentum 99 in.

Mathewl,

on my way to Dyce for 2.30 PM if you are around that area.  In a vRS.

 

Without a Mis-fire, which is surprising,

because i was greedy and put in 40 Litres of Shell V-Power Nitro on a Business card,

and the car has run like sharn since.

So by the time i get to Aberdeen, it will be used up and get some Tesco Momentum 99 in.

 

im actually at work george, we have a project in at the moment and were kinda busy so wont be able to pop out, if it wasnt a weekday this would be great! :( we will have to meet when were both free sometime!

 

it seems a right nightmare how picky our cars are with their fuel!

im lucky i live only miles away from 2 tescos who supply 99ron! i dont touch that over rated over priced shell crap haha

I've just had a misfire job bought in today on a TFSI engine

 

turns out plugs fitted are for French engine, not match to VAG at all. I suspect my N0.4 plug damaged due to them being 10mm longer than the correct plugs :S

Edited 12 May, 201412 yr by AP Automotive

Out of interest, are you getting these misfires under all conditions?  Or is it predominantly when you start getting the engine very warm? Heat has an impact on misfires.  We don't talk much about uprated IC's on here anymore but I think for Stage 1/2 cars the extra flow and lowering of intake temps could be a nice performance gain but also help out reliability issues.  I am starting to think that Stage 1+hardware or full stage 2 could be a healthier state of tune than Stage 1 on the 1.4 twincharger.

 

Do you have a Dyno Graph set from the remap, I would be interested to see what their map looks like.

 

Which NGK BKR plugs do you have in 6's,7's,8's.  This will have an impact, you may be better with a cooler plug and slightly lumpier idle but no misfires.  Definitely visually inspect the condition.

 

Do you have a Forge DV or similar fitted?  Messing with the metered air and potentially fuelling ratios?

The misfires are in any condition either cold warm or hot (all though I don't boot my car when cold) but then again some misfires can be under half throttle, it happens more is Gear 5 out of all the gears, but does happen in all gears here and there, the misfire don't occur every time, they just have there moments.

 

 I have been looking to upgrade my IC as I am running stage one with the carbon fibre ITG Air intake.

 

Not sure that NGK they are if im honest :S

 

And no DV or anything else fitted, just stage 1 and intake are the only engine changes.

Stage 1 map from who,  that was installed by AmD?

Have you not had the Spark Plugs checked again ?

 

?

What sort of figures did it get on the Dyno?

 

With no Warranty i would be inclined to get it running on a Standard VW Updated Map,

and see how it is running,  check out how it runs without the Stage 1.

 

I certainly would not be booting it while it has misfires, 

Big Trouble in little China when under full load with Super and turbo below 3,500 rpm when it misfires.

tubbs0491,

any update?

 

http://briskoda.net/forums/topic/260650-bloody-misfire

No update as yet, I haven't had any time recently, its got MOT on Friday, and I have asked the Tech to take a look at misfires.

It is an AMD stage 1 yes and Sparks havnt been rechecked since I out them in last month.

the Dyno readout was 201.9bhp

 

and ill await what techy tells me