Hi

 

Can anyone advise the correct spark plug gap for the 1.2 TSI 86BHP Roomster as it doesn't seem to be in the manual? Also, I saw a post on here about them being awkward to get to, is it difficult to DIY?

Thanks

Edited 26 January, 20224 yr by insx

Which engine, EA111 engine (cam chain) or EA211 (cambelt) engine?

Edited 26 January, 20224 yr by xman

For the camchain EA111 CBZA engine the following information applies

 

The spark plugs are fine tip iridium alloy centre electrode and platinum alloy insert on the ground electrode, pre set at 0.7mm (NGK IZFR6P7 ) or 0.8mm (Bosch FR6HI332)

 

It is difficult to adjust the gap without damage to the electrodes, but there should be no need as they are extremely hard wearing and the gap doesnt really change, but the ground electrode wears away rapidly once the platinum insert/disc becomes detached, at which point they need changing.

 

Same plugs for the CBZA engine as the higher powered CBZB engine (105ps)

 

Apart from the 0.1mm difference, the other difference is the internal series suppressor resistance is 1kohm for the NGK and 9kohm for the Bosch but I have used both makes without issue.

 

As this engine uses a waste spark ignition system, plugs 1 and 3 suffer from the ground electrode wear whereas 2 and 4 don't. Due to the different polarities of the spark voltage You can clearly see the difference in the photos below

 

You will need a spark plug boot puller to remove the connectors like the Sealey VS5293. Don't pull the leads as you will damage them.

 

https://www.amazon.co.uk/Sealey-VS5293-Spark-Plug-Lead/dp/B001K4EAHY

 

And a 16mm deep plug socket or T bar plug spanner

 

https://www.lasertools.co.uk/Product/0246/Spark-Plug-Socket-T-Bar-16mm

 

https://www.lasertools.co.uk/products/Cars-&-Vans/Engine/Petrol/Spark-Plug-Removal--Fitting

 

All tools available cheaper on ebay etc

Edited 26 January, 20224 yr by xman