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[deviator]

Apart from the obvious comments.

Seicento 2001 Abarth 1.1 sporting. 8v OHC, MPi setup.

Hello I have an intermittent misfire. My code reader reports p0352.

The problem.....
On initial cold start, it starts on 3 and within a few seconds fires up to 4.
Once warm and the car is restarted, the misfire is pretty much constant. (This makes me think heat related).

What I have tried so far.....
Swap coil packs over - No difference, still get p0352 (even after clearing code). In my mind that takes the coils out of the picture. (There are two coil packs, swapped 1&4 with 2&3)
When misfiring, I've pulled the leads (using insulated gloves), the misfire is from number 2.
Pulled plug 1 and 2, visually checked OK, in fact they look new.
Swapped plug 1 & 2. Still same fault/code.
Visually checked 1 & 2 HT leads.
Swapped lead 1 & 2. Still same fault/code.

What I am now thinking.....
Compression testing all the cylinders.
Injector fault.
Wiring fault.
The fault doesn't match the ECU failure posts I've read.

I bought the car with a suggested injector fault. So I would not be surprised if that is the problem. Searching forums, injectors are suggested, so is the ECU (see above). I've also seen mention of injector cleaner solving the problem.

I just wondered if anyone on here had any better knowledge of these cars?

[tidla]

Compression test is a good idea.

Single point injection?

[tidla]

Looking at the wiring diagram, the feed comes from the system relay (item with relay contacts) via a single wire which then splits to the two coils. Ecu then earths the coils thru pins 1 and 19.

[Andy H]

So is it SPI (single point injection) or MPI (multipoint injection)?

If it is SPI then it is unlikely that an injector fault could cause a misfire on one particular cylinder.

[Gaffers]

Have you pulled plugs 3 and 4?  If so what did they look like?

[tidla]

(whiskey in hand)

If i remember rightly, both  plugs on the same coil 2&3 fire (wasted spark)

So swaping leads 2&3 at the coil should make no difference to the running, which would help with fault diagnosis /faulty cylinder id. ?

(edit, re read it so youve kinda done that.)

[Broomies Mate]

If 2001, it should be Multi-Point Injection.  The OP even states so in the original post.

[tidla]

Theres a few different "types " for this model ranging from 150 to 230?

being the abarth model might make a difference to the wiring diagram.

[Broomies Mate]

Theres a few different "types " for this model ranging from 150 to 230?

being the abarth model might make a difference to the wiring diagram.

It's a Seicento.  It had two engine variants...... one was a small one, the other was smaller.

The Sporting was a 1108cc SPi until MY 2000, then MPi thereafter.

Abarth meant bugger all, except for 'styling'.

[tidla]

[tidla]

The only other diagram, very similar but still single point?

[deviator]

Thanks for the replies, it is definitely multi point injection, no if or buts. I can see 4 injectors.

I'm am aware of the wasted spark. As above I have swapped the 2 coil packs over, A runs 1&4 and B runs 2&3. Fault code still says coil pack B.
The swapping of plugs and HT leads was done between cylinder 1 & 2, hoping that if the plug and or ht lead was at fault, the code would move to coil pack A, but it didn't.

Due to the way the fault appears, I am pretty certain it is electrical. Even when it misfires, I can sometimes stop and start the engine and it may or may not bring all 4 into life.

It's a funny fault and I'm starting to lean towards the low tension leads to the coil packs, unless anyone has any other ideas? From the googling I have done, a faulty ECU isn't intermittent, it either works or not.

[Broomies Mate]

As you have read the code, I'm assuming you have reset the ECU?  Just in case there is a weird French thing going on!

As it's sticking with the same cylinder, a compression test may be in order, although unlikely to be an issue - That engine is quite bullet-proof.

[henryd]

0352 is a coil failure code,coils on that engine are prone to failure at 40-50k miles,sometimes however the coil failing can take out the ECU drivers too which will give the same code,I would replace a coil first and if doesn't work and find out much BBA reman want to check out/fix the ECU.

[deviator]

As you have read the code, I'm assuming you have reset the ECU?  Just in case there is a weird French thing going on!

As it's sticking with the same cylinder, a compression test may be in order, although unlikely to be an issue - That engine is quite bullet-proof.

Yes, read and reset codes all the way through. Compression test is my next, urm, test  if this weather ever gives me a break.

0352 is a coil failure code,coils on that engine are prone to failure at 40-50k miles,sometimes however the coil failing can take out the ECU drivers too which will give the same code,I would replace a coil first and if doesn't work and find out much BBA reman want to check out/fix the ECU.

I've read similar things and my coil packs are I believe original and at 39k. So this was my first thought. However I would have expected the code to move to the other coil pack when I swapped the two over. I didn't. I've also read about the frying of the ECU drivers, however this leads to a permanent fault, not a suspected heat related intermittent issue that I currently have.

Thanks for the replies, I appreciate all the help.