Had the plugs changed recently after a misfire in cylinder 4 last week and taken the car back to the same garage today and they are saying the engine is misfiring in all cylinders. Is this possible or are they having me on? Either way it’s ****ing me right off buying a car with hardly any miles on and it’s playing up like this

Oh it’s a 2010 Fabia VRS twin charged 

In the absence of Offski to put the usual barrage of questions your way.....

 

Do you know much about the service history of the vehicle, including the most recent service that was carried out and are you able to advise what spark plugs you had fitted? Denso SKJ20 are the recommended choice of Offski.

 

Do you know if the car has had any engine work carried out in the past? Many of these, even on low miles, had engines replaced or oil breather modifications carried out due to excessive oil consumption. If the consumption problem goes unchecked you will encounter serious problems with the piston rings leading to a loss of compression in one or more cylinders, leading to either a very expensive rebuild or expensive replacement of the engine. If work has been done there should be a note added in the back pages of the Service Schedule booklet.

 

Do you have any warranty with the car? If so, you should take it back to the seller and ask them to put the problem right. in all likelihood they should carry out diagnostic test and see where that leads. Sadly it is not unknown for these cars to encounter spark plug problems as many threads on the forum will testify.

 

Do you know if the car has had any service action work on the DSG? Again there would be a sticker in the tyre well in the boot should there have been work carried out. Some, but not all had work done to change synthetic oil to mineral oil.

 

Do you know if the car has had the water pump changed? The supercharger clutch is part of the water pump and so it usually needs changed around 6 years old.

 

Brake fluid should be changed after 3 years and then every 2 years thereafter.

 

Try to run car on best superunleaded you have access to, many run on Tesco Momentum 99 Ron, others prefer the Shell Superunleaded.

 

 

In your other post you said RAC fitted NGk's, maybe wrong type were fitted, suggest you get denso official ones from euro car parts, don't chance eBay and get a proper garage to fit them. Measure the spark plug gap on all with some feeler gauges.

Edited 2 September, 20196 yr by Kobayashi

They ended up replacing them with Bosch plugs but now they have replaced the plugs again and all 4 coils and it’s still got a misfire. It’s so confusing this car 

Im stumped, ive had 4 x bosch in before for a full year and not an issue with them. Also have NGK's in fact they are in at the minute and been in a year. I was changing them every year but this year decided to leave them in.

 

You need to get it to a proper garage and not RAC fitters. They have left your car in a worse condition than when the problem started.

 

Have you got all the spark plugs in your hands that they removed or did they keep them ,including your original ones?

 

 

1 hour ago, 2010fvrs said:

They ended up replacing them with Bosch plugs but now they have replaced the plugs again and all 4 coils and it’s still got a misfire. It’s so confusing this car 

I think this has to be a timing issue; no way have they managed 2 full sets of bad plugs and 4 bad coils.

unfortunately the twin charger 1.4tsi is a bit of a lemon of an engine

 

you need to take it to a proper garage with proper tech's

See the thing is it is at a Skoda specialist garage. It’s also rac approved because I have a warrenty with rac. I had the plugs originally replaced 2 weeks ago with Bosch plugs then a sudden misfire happened yesterday and they replaced the plugs and coils again and still a misfire. My friend is a vw mechanic and said to do a compression test and check the injectors. If the injectors are fine he said it could either be a timing issue or a cracked piston. Either way it’s aggravating. The car drove perfect when I brought it last month so it’s a sudden thing 

Just now, 2010fvrs said:

See the thing is it is at a Skoda specialist garage. It’s also rac approved because I have a warrenty with rac. I had the plugs originally replaced 2 weeks ago with Bosch plugs then a sudden misfire happened yesterday and they replaced the plugs and coils again and still a misfire. My friend is a vw mechanic and said to do a compression test and check the injectors. If the injectors are fine he said it could either be a timing issue or a cracked piston. Either way it’s aggravating. The car drove perfect when I brought it last month so it’s a sudden thing 

that doesn't sound very good

 

fingers crossed for you

 

 

The compression test is the next thing, should be 130ish from memory

@2010fvrs

Is all well now with the engine, what was the problem?

Yeah I should have replied. The mechanic put the wrong plugs in the car. They used Bosch and the engine didn’t like them at all so now he’s put the denso ones in like I originally suggested 

The correct Bosch plugs with the correct gap are fine,

it would be good to know how he sourced the wrong plugs for the engine they were dealing with.

Agreed; the main difference between Bosch, Densu, Champion and  NGK plugs in $heat_grade is normally the label on the insulator. Of course, sometimes a specific engine design prefers one make over the other 3 but those differences are normally marginal.

& then the CAVE came with the NGK / VW plugs with a 0.8 gap,  and then they (VW ? SKODA) changed the OEM plugs and to a 0.7 gap, 

and the DENSO i recommend came with a 0.8 Gap which i leave them at.

 

Blue Spark and Tuners advised a 0.6 Gap,  and then people bought Denso Plugs that came with a 0.4 gap.

 

There was a TV programme called 'Soap',  it was easier to follow than the CAVE & CTHE saga with spark plugs.

Just as well for forums.