I have a 1.4 8v 2006 Grande Punto.

The engine splutters and looses power occasionally, especially at low revs and high acceleration/going up hills.
Quick question. Is it easy to replace a coil pack oneself? Is there a guide anywhere? I had it checked a while ago and was told the "ignition coils" were at fault.

simple replacement, nothing difficult or special tools required.

(I would check leads first though, especially No4)

Might seem like a silly question as I've not looked that closely at the leads before: How are they numbered/which one is No.4, and why is that one particularly troublesome?

No 4 is on right side (nearest battery) and suspect to breakage when removing.

few pics of the coil pack in this guide

https://www.fiatforum.com/grande-punto-guides/237966-1-2-8v-evo-2-engine-cam-belt-replacement.html

Those are excellent guides thanks. I'd been through the spark plug guide on my car in the past but hadn't bothered looking at the cam belt one. A little bit over my head for now, know what I mean? Excellent photo of the coil pack removed. That's all I needed to see there were no nasty surprises/complications awaiting unsuspecting noobs, technical or safety related.

I'm going to follow T14086's suggestion first though, of checking the HT leads' resistance. Not sure how low they should be yet (although I've seen a few suggestions on various websites), but if one sticks out widely from the others, I'll know something is wrong.

there is only the 4 ht leads to remove (mark them first )

then a multi plug then undo the 3 bolts and off the coil pack comes (mihgt be an idea to take the battery off for 20 mins before starting to ensure any residual current has discharged from the coil pack,...

If No4 lead (or any other) is faulty they usually fall apart when removing, check the lead firmly 'clicks' when refitting.

Another thought, why is it important to mark them 1 to 4? If I remove test and replace them one by one it shouldn't make a difference. Are the leads not all equivalent? If one is faulty can I not just replace that one or should I replace the lot?

As for the right coil being connected to the right sparkplug, are they not normally logically placed (eg. rightmost coil to rightmost plug...etc)?

just good practice especially if they are after market leads and not already numbered....... 2 + 3 are a similar length....

Is it normal for it to be so difficult to remove the HT leads? I only managed to remove the no.4 one, and it broke in the process. The rubber hose detached but the metal connector holding on to the spark plug held firm (yes I did hold onto the end, and not the main lead). Thankfully, I had a supplier of HT leads within walking distance. In the end, I used a pair of pliers to yank the remaining metal connector from the spark plug.
Thankfully, that seemed to rectify the problems I've been having, so I haven't needed to try the same with the other leads.
Was it so difficult because the lead was faulty, or is it always tricky to remove the leads without damaging them?

Also, I measured a resistance of approx. 3.4K Ohms on my new leads. I'm guessing this is normal, just saying in case anyone reading this wants to know what they are meant to be.

T14086 said:

If No4 lead (or any other) is faulty they usually fall apart when removing, check the lead firmly 'clicks' when refitting.

Click to expand...

Remy said:

Is it normal for it to be so difficult to remove the HT leads? I only managed to remove the no.4 one, and it broke in the process.

Click to expand...

Hope your car is now sorted and running well

A bit of an excessive bump, but I had the same problems as OP so found this thread after trying to post a new topic... I checked the coil pack.

sockets 1,2 and 4 were very corroded in the coil pack, a lovely shade of blue/green but 3 was fine and clean. HT leads were in bad shape and broke when removing. Changed the spark plugs too.

I bought my 07 car this February. The difference it's made to the running of the car is staggering. I only noticed the car wasn't running properly when I started kangaroo-ing at low revs (also a slight judder at idle), but the issues were present and not noticed for longer than that.. Replacing the coil pack and leads has it running MUCH better than when I bought the car! It's so much easier to drive.

Just one question, I have no way of knowing when the coil pack was last changed (if ever). So was wondering what causes corrosion like this? Is it just something that just generally happens? Or should I be looking at something else to maintain the lifetime of the parts.

Can't say I've had any issues with mine. Maybe try some dielectric grease if you're worried.

Would you mind sharing the make and price of the coil pack?

ACTM said:

... So was wondering what causes corrosion like this? Is it just something that just generally happens? .

Click to expand...

The nice green/blue-ish colour is copper oxyde, to avoid it to happen on your HT leads you should insulate them from moisture with a good dielectric stuff like Dow Corning HT grease ...

BRs, Bernie

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