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Old 08-11-2011   #1
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Dreaded cold start :(

Hi All,

I've read a few threads on cold starts and have found it may be related to the map sensor.

Seeing as I know that, everyone will prob think its a waste of time posting, either way, i really dont want to spend money (coming up to christmas) uneccesarily. So heres my problem:

When starting from cold, the engine often sputters, makes a few noises then starts. Not too bad, its expected when its cold.

But today and more often recently, the engine will just grind (the sound it makes when you try turning the key when already started) and will start on the second attempt.

This really doesnt sound good, is this causing damage?

Additionally, when setting off from cold, just lifting the clutch gives me some sort of super boost no matter what gear im in, nearly sending me into other cars in the car park.

Now i've said the symptoms, my question is, how can a car be so bad on a morning (as oppose to other cars I have driven) and also, are these signs of a fault to come?

Many thanks in advance,

Sam
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Old 08-11-2011   #2
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Re: Dreaded cold start :(

Quote Originally Posted by sammclean23 View Post
Hi All,

I've read a few threads on cold starts and have found it may be related to the map sensor.

Seeing as I know that, everyone will prob think its a waste of time posting, either way, i really dont want to spend money (coming up to christmas) uneccesarily. So heres my problem:

When starting from cold, the engine often sputters, makes a few noises then starts. Not too bad, its expected when its cold.

But today and more often recently, the engine will just grind (the sound it makes when you try turning the key when already started) and will start on the second attempt.

This really doesnt sound good, is this causing damage?

Additionally, when setting off from cold, just lifting the clutch gives me some sort of super boost no matter what gear im in, nearly sending me into other cars in the car park.

Now i've said the symptoms, my question is, how can a car be so bad on a morning (as oppose to other cars I have driven) and also, are these signs of a fault to come?

Many thanks in advance,

Sam
I might possibily suggest a flat/on way out battery as that would cause issues starting from cold, less power in an older colder battery, less cranking amps and a relunctance to start. I would give that a quick test.

The super boost is bad clutch control and engine anti stall protection all happening at the same time, give it 5-10 seconds before pulling off when cold and be very slow with the clutch see if that helps you at all.
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Old 08-11-2011   #3
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Re: Dreaded cold start :(

Quote Originally Posted by TallTom View Post
I might possibily suggest a flat/on way out battery as that would cause issues starting from cold, less power in an older colder battery, less cranking amps and a relunctance to start. I would give that a quick test.

The super boost is bad clutch control and engine anti stall protection all happening at the same time, give it 5-10 seconds before pulling off when cold and be very slow with the clutch see if that helps you at all.
Thanks a lot for the suggestions mate. Will get it tested asap. Could it be possible that my amp is taking some of the power away making it harder to start?
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Old 08-11-2011   #4
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Re: Dreaded cold start :(

Yes it could be get the battery load tested and go from there
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Old 08-11-2011   #5
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Re: Dreaded cold start :(

Quote Originally Posted by Andy Monty View Post
Yes it could be get the battery load tested and go from there
cheers guys!
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Old 20-11-2011   #6
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Re: Dreaded cold start :(

Got the battery tested and he said "the battery is fine but could do with a good charge" also, "the alternator is fine so you could have a drainage on the battery"

MAP sensor?
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Old 20-11-2011   #7
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Re: Dreaded cold start :(

Lol super boost. The revs idle at 1.3k until warm, before dropping to 0.7k. So if you lift the clutch it gives you the impression of foot down even though you're foot isn't on the gas.
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Old 20-11-2011   #8
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Re: Dreaded cold start :(

Quote Originally Posted by Magic Johnson View Post
Lol super boost. The revs idle at 1.3k until warm, before dropping to 0.7k. So if you lift the clutch it gives you the impression of foot down even though you're foot isn't on the gas.
haha what else to call it lol! yeah iv realised now. Been letting engine run for a bit longer now before moving off

EDIT: Just started engine after turning it off and had the spluttery start. Only two minutes before the engine was at running temperature so I guess this rules out cold start
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Last edited by AgnessGP; 20-11-2011 at 12:22.
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Old 20-11-2011   #9
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Re: Dreaded cold start :(

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Old 18-12-2011   #10
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Re: Dreaded cold start :(

Being honest, iv not yet done any of the suggestions above, i just keep putting them off

My question is though, is the grinding/puffing into life/squeaking as though my cam belt is gonna fall off, causing any damage to my engine on cold starts?

I mean i can live with it until my mate (who has all the tools) decides to help me, but not if im doing any damage.

Thanks in advance,

Sam
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Old 18-12-2011   #11
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Re: Dreaded cold start :(

The grinding is usually the starter motor not fully engaging with the ring gear inside the gear box due to a reduced voltage at the starter (its pulled in via a solonoid)

Yes it does do damage to either the cog on the starter motor or the ring gear in the gear box...


You tried charging your battery? if it works for a short time i'd still opt for a new battery think yours is still an original or at least it looked like it when i had a poke about under there at york
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Old 18-12-2011   #12
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Re: Dreaded cold start :(

**** okay. Well think ill get the ball rolling for a new battery. Thanks for the speedy reply!
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Old 18-12-2011   #13
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Re: Dreaded cold start :(

If its anything like mine you wont believe the difference on start up with a new battery...

see the guides section on how to do it....

just remember - off first then + ....... then + on first then - on last when you put the new battery on
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Old 18-12-2011   #14
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Re: Dreaded cold start :(

Thanks Andy, will do!
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Old 19-12-2011   #15
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Re: Dreaded cold start :(

Andy, or anyone for that matter.

Just tried charging the battery, but it's fully charged and will not charge further. The battery tester says it is fully charged also.

The battery in my car is: varta 12v 40AH 300A

This seems okay, but my gf old yaris was 360A. Just thought id throw that in there.

So what next, MAP sensor or should i really clean the throttle body as you advised above?

Thanks!

Sam
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