Rough start on cold

[HSVenforcer]

Hi all,

Just a quick question about batteries and rough starts. I have to replace my battery as its only showing 12.2 volts at rest over night and i was wondering if a battery problem could also be the cause of rough starts.

When my car is allowed to rest over night it drops cylinders when i start it in the morning (car is garaged at home). Only once has it recorded trouble codes. Yesterday i got codes for cyl 4 and 5 misfire (P0300 P0304 P0305). I cleared them and am waiting to see if the same codes come back or if different cyls misfire. Started this morning and it was only a little rough and no code recorded. Seems like when it drops 1 cyl it isnt bad enough for a code to register.

I have been thinking its the ignition packs but they are only 50,000km old (I installed genuine) but since the battery is a little crook thought that i would ask in here before i start buying new packs etc.

Car is VZ Berlina with the 172kw Alloytec with 194,289km on the clock. Cars otherwise runs well.

Thanks in advance

 

[elless1]

It could be the battery. Is it charging when its running? Have you put a good battery in and tried it?

If the alternator isnt charging it,the whole sysytem will have trouble running properly off 12.v,
whether it presents the symptoms you described or not, i dont know.

 

[HSVenforcer]

The alternator is charging. I get approx 14.4 volts when the engine is running. I dropped in the battery from my wifes car this morning and it fired up perfectly. I knew it needed changing soon but found it weird that a dieing battery would also cause multiple misfires. Dont think i will ever get my head around alloytecs properly.

Thanks for the reply