Ford Fiesta - Fiesta lacking power and shuddering

Honest John Back Room » Technical matters
View Threaded
Sat 14 May 2016 21:16
Ford Fiesta - Fiesta lacking power and shuddering - Evobear
My fiesta 1.4lx 54 plate has recently been under powered and juddering under acceleration. I took it to be serviced (plugs/air, oil filters/oil), when the mechanic noticed my core plug had worn and was filling spark plug area with water. I had core plug replaced and car serviced (car drove home fine), the next day however, same problem. I went back to garage (core plug was leaking) and they fixed it a 2nd time. now I have a misfire on cylinder 3, I've changed the plug leads but car still feels underpowered and I can feel (myself & car) juddering when stationary with engine idling, should I replace coil? Or is there any other suggestions you may have, any ideas greatly apreciated.
Reply | Report as offensive | Link
Sat 14 May 2016 21:47
Ford Fiesta - Fiesta lacking power and shuddering - elekie&a/c doctor

Plugs,leads and coil are a common failure on these.So ,yes,I would replace the coil,but make sure there is no water in the spark plug recess.

Reply | Report as offensive | Link
Sun 15 May 2016 04:11
Ford Fiesta - Fiesta lacking power and shuddering - Evobear
Ok I'll replace that next, when I did the leads, there was no water inside, but I will check again before I fit the coil (would you say an amateur could do it? Or should I take it to a garage?), as I've lost faith in the garage that's worked on my car already.
Reply | Report as offensive | Link
Sun 15 May 2016 09:25
Ford Fiesta - Fiesta lacking power and shuddering - elekie&a/c doctor

It is not a difficult job ,but you will need the correct Torx drive tools to release the bolts. Also be warned,the new coil may need to have the leads fitted in a different order.Check the instructions that should be supplied with the new unit.

Reply | Report as offensive | Link
Sun 15 May 2016 18:43
Ford Fiesta - Fiesta lacking power and shuddering - Evobear
Ok I'll purchase the correct size tool when I get the coil. Thanx for the advice, I'll let you know how I get on
Reply | Report as offensive | Link
Mon 16 May 2016 19:06
Ford Fiesta - Fiesta lacking power and shuddering - Evobear
I've fitted the new coil pack and my car is now running (at least it sounds right, no misfire), but the check engine light is still on. I have run the car round the block and it seems as it was before the core plug issue. How do I get the light off, so I can run the car to see if light comes back on. Thanx for your help it has been much apreciated
Reply | Report as offensive | Link
Mon 16 May 2016 19:59
Ford Fiesta - Fiesta lacking power and shuddering - elekie&a/c doctor

You will need an obd scanner to get the light out.Probably £30 or less off the 'Bay.

Reply | Report as offensive | Link
Mon 16 May 2016 20:11
Ford Fiesta - Fiesta lacking power and shuddering - Evobear
Thanx again for your assistance, I'll have a look for one.
Reply | Report as offensive | Link

Looking for a garage you can trust? Honest John's Good Garage Guide has thousands of reader recommended garages, plus how-to guides and tips on servicing.

The Good Garage Guide

From which small car to buy at which price point to the best UK-built cars, our Top 10s have the lot. Click now for your shortlist.

Unsure of what to buy? Our Top 10s are here to help you....