Technical Fiat Punto mk2/2b 1.2 8v (2004) - Rough idle, mostly on electric load

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Technical Fiat Punto mk2/2b 1.2 8v (2004) - Rough idle, mostly on electric load

I would add in this topic something that I've just discovered, as I've mentioned earlier that
The problem when rev goes under 600 RPM is the pressure being to high inside the cooling system.
It looks that the high pressure was just something extra that was adding up to the real problem and by fixing the pressure issue I've manage to make the engine not to rev down, but the problem was still there.
The adjustable tightener of accessories belt had the roller's movement limited by the deformed cover that was holding the roller in it's place. I think that was really causing the rev to drop down on idle.
And this days the same roller, moving even harder than before, added extra engine load and caused the engine to rev up on idle this time, to 2000RPM. The rev was done repeteadly up and imediatly down again and so on. The problem seems to be fixed now, after I've took that deformed cover off and placed a washer instead and the roller moves free now.
 
Seeing my post above and by this time, figuring exactly what was the problem and having it fixed, here it is: that problem was caused by IACV malfunction and the fix was replacing it with a new IACV (Idle Air Control Valve). I've even started a topic here somewhere about it.
 
Seeing my post above and by this time, figuring exactly what was the problem and having it fixed, here it is: that problem was caused by IACV malfunction and the fix was replacing it with a new IACV (Idle Air Control Valve). I've even started a topic here somewhere about it.
Here is the link for anyone searching.


@Mike1alike Where did you buy the replacement? I think I'm in need of doing the same :/
 
I bought it on a local auto parts store.
I put a picture with the code, I hope it helps to find one nearby.
I will put this picture in that link you've added, too.
 

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what spark plugs do you have on there ?
copper, iridium ??? model number ? specs ?
 
These are the plugs:
NGK 4983 DCPR7E-N-10 Standard Plug
Corrugated Ribs
Triple-Gasket Sealing Process
Copper Core Shell
Thread Size: 12mm
Thread Pitch: 1.25mm
Seat Type: Gasket
Resistor Value: 5K Ohm
Reach: 19mm (3/4")
Hex Size: 5/8" (16mm)
Terminal Type: Solid
Overall Height: ISO
Gap: .039" (1.0mm)
Center Electrode
Material: Nickel
Type: Standard
Size: 2.5mm
Projection: Projected
Ground Electrode
Material: Nickel
Type: Standard
Quantity: 1
Specifications
Warranty: 1 Year
Torque Specs: Cast Iron: 10.8-18 lb. ft. Aluminum: 10.8-14.5 lb. ft.
Brand: NGK
Heat Range: 7
Longevity: 30k Miles
Resistor: Yes
 
Actually, I jumped with my answer there. I remembered that now I don't have those NGK plugs, I have the Denso equivalent. The NGK that I had before were almost done, pretty close to the maximum kms they are recommended to run, and someone, from his experience, recommended me Denso saying that he is happier with that brand than with NGK and he used both on many engines. Now, I can say that they both work pretty much the same, but I tend to prefer NGK. Next set will be NGK. Who knows, maybe even... ruthenium.
 
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