Hi my 2004 punto 1.2 8v doesnt seem to idleing properly it seems to judder when stopped in traffic then when i gently put my foot on the acclerator it seems to take some tim pe for it to regester ive checked the battery and it has 12.31 volts then with engine running its about 13.9 volts then with lights and heater on full its getting 13.69 volts should i replace the alternator or battery or is it something to do with the throttle body? the problem is really starting to annoy me so help would be aprieciated
thanks AJ

also should mention theres no fault codes from an ecu scan and ive recently re gapped and cleaned the plugs and cleaned the throttle body but problem is still there

Although the readings look a bit lower than you'd like to see, I doubt (as in a lot) it's anything to do with the alternator or battery.

How old are the plugs and leads? When was the car last serviced?

the voltage are a little low for the Average good results
But tbh i get them results and no issues as well, so i wouldnt be worried

I'd get the throttle body cleaned up as well, check that also the throttle cable isn't ""binding"" as that can cause odd issues

I suspect the cold air and vapour from breatehrs just clogged up the throttle body a little bit

ziggy

Hi thanks for the replies i shall check the throttle cable later. i checked the battery test guide on here and it says put main beams on, heater on full and rear screen on, i only put dipped lights and heater on full and still got less so could that make it a fault with my alternator?
ive recently had a new clutch and gearbox put in and didnt do that before so wondering what it could be
thanks AJ

where were you checking voltage after you turned everything on in mes or with volt meter directly on battery? cuz rumor has it if you watch voltage in mes it will be significantly lower than it actually is

just a multimeter on the battery

Unless the battery/alternator light is on, I'd tend to forget it. But you can get free battery tests at a lot of factors. Generally, until you have problems starting, you're OK.

Id not be worried about that battery/Alt issue its okay for now

Dont just check throttle cable
Check the throttle butterfly
Get a wrag with brake cleaner/white spirits/carb cleaner/even a lil bit of wd40 will work
Spray lightly on and wipe Clean
Don't go made with cleaner as it might cause little rough running on first startup but it will clear


Ziggy

thanks for the replies cleaned inside and arounfpd butterfly on throttle body, then thought id check all the fluids on my car (been about a month or so) checked radiator took the cap of because it wasnt easy to if it had enough coolant, put the cap back on though ill bleed the system just incase...
now the cars fine, must have just been an air lock
thanks AJ

put a flashlight close to coolant reservoir and you will see where the level is