On the 1108 and 1242 8v engines the valve clearances are set by shims.

If you can get hold of a manual for a Cinq, Sei or Punto of the period, it'll be explained.

At least one person fitting the 866 cam to an MPI Sei has reported the EML light -- code read will give some clue as to why the ECU is unhappy.

fingers99 said:

At least one person fitting the 866 cam to an MPI Sei has reported the EML light -- code read will give some clue as to why the ECU is unhappy.

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I'm running a complete P75 engine with 866 and no issues on the mpi sei ecu. My best guess is it could be down to installation/valve clearances as mentioned.

fingers99 said:

code read will give some clue as to why the ECU is unhappy.

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I tried to read the code from the obd2 scanner but it didnt keep the problem in memory because the engine light was flashing when driving and not always..

DimSei said:

I tried to read the code from the obd2 scanner but it didnt keep the problem in memory because the engine light was flashing when driving and not always..

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I've found when my exhaust manifold was blowing the engine light would flash ocassionally (emissions parameters or something) however it would always save the code even if it just flashed up rather than stayed lit.

Have you tried a different OBD2 reader as the code should be there?

Cento186 said:

Have you tried a different OBD2 reader as the code should be there?

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No i didn't they told me that the reason the light flashes on is the lack of ecu remap.. And the cost is 300euro plus150 on dyno. I think it's too much for a 866 cam installation only and i can't even afford it. Should i believe theem?

DimSei said:

No i didn't they told me that the reason the light flashes on is the lack of ecu remap.. And the cost is 300euro plus150 on dyno. I think it's too much for a 866 cam installation only and i can't even afford it. Should i believe theem?

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Not without codes to back it up!

DimSei said:

No i didn't they told me that the reason the light flashes on is the lack of ecu remap.. And the cost is 300euro plus150 on dyno. I think it's too much for a 866 cam installation only and i can't even afford it. Should i believe theem?

Click to expand...

Sounds like 'they' don't know what they're talking about, total stab in the dark

It confuses me because this guy knows a lot about Fiats but couldnt find the error and here in my country he is very famous for his ecu remaps that has already done. Anyway, i found this thread https://www.fiatforum.com/punto-ii/137141-shim-tolerence-fitting-866-camshaft.html maybe this could help me to install it ideally.

Yeah. Forget the last post -- he's talking about a different engine altogether.

how can different camshaft add power?

By altering the valve timing.

It's not simple: tuning book recommended.

interesting, so its not just a simple swap and time the engine again

Well, that's how the valve timing is altered -- by putting in a different cam. You can also "swing" cams to change the valve timing, but on an engine with a single cam, you're unlikely to get much from that.