Low Cranking Voltage ? R33

[WogsRus]

Well I have been having cold start issues lately, the thing just starts like a tracktor, see my other posts.

I uses datalogit to see what is goignon, and i can't see anythign obvious, exceppt teh battery voltage dropping to 7.4V. I have seen 6.6 and 8.2 a couple of times.

Can this attribute to starting issues.

The funny things is that it only starts like a dog one, when cold, any other time after that, during the day, eaven in the afternnon, it will be fine.

Basically if ECU temp sensor is below 20 Deg C it starts like a dog.

[SECURITY]

could be the signs of a dieing battery/alternator.

[WogsRus]

well once started i get full 14.2 V charging, so possibly battery. But the qestion is more about wheather or not low cranking voltage is an issue.

[R33LIN]

hey mate,

it seems as though ur battery is on its last legs, obviously you will find it more difficult to start the car in the colder conditions than when hot. i found that when buying a car battery go for a battery that has a higher cca value. i think cca stands for cold cranking amperage. the higher this value, the more cranking amperage you have and thus the ease at which you can start your car. As batteries get older the cca deteriorates .

best to get a new battery mate,

hope that helps.

cheers

[WogsRus]

Well the thing is, it's a Hitachi 6 month old battery.

What has been happening.

Basically, when I go to start the car when it is below 18 Deg C, the car splatters, sounds like it’s a bit flooded, revs at 300 rpm, then coughs, splatters and is fine from there.

I have done many things, and over the weekend what I did was to turn the fuel pump off, and pressurize the fuel system with air, to remove all fuel, you will be surprised to hear that the car will run for 2 minutes on the fuel in the fuel rail alone.

So after ensuring that there was no fuel in the rail, or injectors, I was hoping to solve my problems of cold start, but figuring out that it’s a leaking fuel injector.

WELL, I reconnected the hoses, primed the lines and the car still started like crap.

So I figure it’s not the injectors, but can someone shed some light on if what I did could prove that it was not the injectors.

HELP.

[SECURITY]

go to an auto electrician and get them to test your battery and your alternator.

[MANWHORE]

hey wog, mine does the dog start thign too. I have a new battery, so it's not that.

I have plenty of cranking power, once it's cranked over, that's when it's a dog. when i release the key.

I have'nt cleaned the aac yet though.

Cheers

Chris

[tridentt150v]

I could be your starter motor?

If the brushes are worn and they have also worn the armature then you'll get arcing. This arcing robs the power out of your battery and lowers the health of the spark at the plugs. This means that your spark is dull/weak so your motor is trying to/firing on a weak yellow spark, not a fat blue one. Not sure if this can happen to skylines, but other motors it definitely happens, I've seen it and repaired it [well got the starter motor rebuilt].

If you crank the starter motor over and check the armature at the same time you'll see the arcing, they all arc a bit, but if its bright and strong then I'd get the starter motor checked.