Hi, so a few days ago I had the last coil changed on my 2003 1.2 fabia ( the 3 cylinder, it's petrol and on nearly 130,000 miles), it runs fine now however the engine judders every now and then. I've done 5 15-20 min journeys after the 3rd coil was changed. All 3 have now been changed within a year.

 

So the only time the engine light comes on was when I was doing around 60 mph or accelerating up to around that speed. The light doesn't flash, it just stays on for about 10 seconds and then goes off and so far hasn't come on until I do a faster speed again, usually on my next journey. The engine has juddered once or twice but on separate journeys.

 

What could it be, the coils have all been changed, spark plugs maybe?

 

Thanks.

2 hours ago, BroScienceSupreme said:

What could it be, the coils have all been changed, spark plugs maybe?

Or the fuel feed, one or more injectors, traction control if applicable, drive by wire throttle if applicable...

Check/change the spark plugs. This is the most likely reason imo, as the eml light comes on when misfires detected and goes out automatically when misfires stop. £10 for a set of new bosch plugs from ECP.

 

Scan car for OBD error codes if you can, an obd reader can be bought for £20

 

Burnt/worn exhaust valves/seats are a known issue on high mileage HTP engines that havent had regular oil changes, symptoms would be judder under hard acceleration I think, compression check required to confirm

 

My AZQ 2004 HTP engine had a  stuck egr/sensor at that mileage,  but eml came on permanently though engine ran normally, no juddering.

 

 

On 23/04/2021 at 18:49, xman said:

Scan car for OBD error codes if you can, an obd reader can be bought for £20

 

 

Which OBD reader do you recommend? One I just got off ebay was duff.

I bought a Streetwize Obd reader from Eurocarparts. It is very basic but only cost me £15 with their discount code and does the job.