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From: Doki on 16 Sep 2009 17:47
My girlfriend's Golf is having a bit of starting trouble. Basically, the
starter will spin the engine fairly well, up to about 400 revs or so, which
if I recall correctly, is about right for a starter. However, the engine
doesn't catch. Give it a welly full of throttle, and it'll fire and then bog
down again at around 600rpm, and stall. What it reminds me of most is
driving an old MK2 Golf with a bunged up ICV / the idle screw turned too far
in.

Keep giving it a bit of throttle (say, 5 or ten seconds held at
1000-1500rpm) and it's fine.

I replaced the breather pipe that feeds from the oil seperator into the
airbox, so it's possible that the throttle body is gunged up, but I can't
see why that would cause cold start issues, but not at any other time.

Other candidates are that the throttle body stepper motor has worked out of
alignment, and finally there's the possibility that there's something wrong
with the charging system / battery / spark, and there's not enough energy to
properly ignite a whiff of air and petrol in a cold engine, or the
alternator is pulling the engine revs down, trying to get some charge into a
near dead battery. The battery is claiming to be fine, with green showing in
the window.

Obviously I'll have a bit more idea tomorrow, when I can take the DMM out
and get some readings for the battery voltage. Any other possibilities?

From: Duncan Wood on 17 Sep 2009 02:55
On Wed, 16 Sep 2009 22:47:23 +0100, Doki <mrdoki(a)gmail.com> wrote:

> My girlfriend's Golf is having a bit of starting trouble. Basically, the
> starter will spin the engine fairly well, up to about 400 revs or so,
> which if I recall correctly, is about right for a starter. However, the
> engine doesn't catch. Give it a welly full of throttle, and it'll fire
> and then bog down again at around 600rpm, and stall. What it reminds me
> of most is driving an old MK2 Golf with a bunged up ICV / the idle screw
> turned too far in.
>
> Keep giving it a bit of throttle (say, 5 or ten seconds held at
> 1000-1500rpm) and it's fine.
>
> I replaced the breather pipe that feeds from the oil seperator into the
> airbox, so it's possible that the throttle body is gunged up, but I
> can't see why that would cause cold start issues, but not at any other
> time.
>
> Other candidates are that the throttle body stepper motor has worked out
> of alignment,

If it's gunged up then it will be difficult to start, but it'll idle
roughly as well.

> and finally there's the possibility that there's something wrong with
> the charging system / battery / spark, and there's not enough energy to
> properly ignite a whiff of air and petrol in a cold engine, or the
> alternator is pulling the engine revs down, trying to get some charge
> into a near dead battery. The battery is claiming to be fine, with green
> showing in the window.
>
> Obviously I'll have a bit more idea tomorrow, when I can take the DMM
> out and get some readings for the battery voltage. Any other
> possibilities?


--
Duncan Wood
From: Doki on 17 Sep 2009 02:57

"Doki" <mrdoki(a)gmail.com> wrote in message
news:7hd4pvF2qmo1lU1(a)mid.individual.net...
> My girlfriend's Golf is having a bit of starting trouble. Basically, the
> starter will spin the engine fairly well, up to about 400 revs or so,
> which if I recall correctly, is about right for a starter. However, the
> engine doesn't catch. Give it a welly full of throttle, and it'll fire and
> then bog down again at around 600rpm, and stall. What it reminds me of
> most is driving an old MK2 Golf with a bunged up ICV / the idle screw
> turned too far in.
>
> Keep giving it a bit of throttle (say, 5 or ten seconds held at
> 1000-1500rpm) and it's fine.
>
> I replaced the breather pipe that feeds from the oil seperator into the
> airbox, so it's possible that the throttle body is gunged up, but I can't
> see why that would cause cold start issues, but not at any other time.
>
> Other candidates are that the throttle body stepper motor has worked out
> of alignment, and finally there's the possibility that there's something
> wrong with the charging system / battery / spark, and there's not enough
> energy to properly ignite a whiff of air and petrol in a cold engine, or
> the alternator is pulling the engine revs down, trying to get some charge
> into a near dead battery. The battery is claiming to be fine, with green
> showing in the window.
>
> Obviously I'll have a bit more idea tomorrow, when I can take the DMM out
> and get some readings for the battery voltage. Any other possibilities?

Right. Had the digital multimeter out, and the battery's kicking out a nice
healthy 12.6V before starting, and 14.4V after.

However, the missing warm air feed pipe from the top of the exhaust
manifold, which I yanked off in July before it could disintegrate and chew
up a belt, was staring me in the face. Sure enough, the flap in the intake
pipe was swiched over to warm air... Think that'll be my first port of call.

From: SFC on 17 Sep 2009 03:26

"Doki" <mrdoki(a)gmail.com> schreef in bericht
news:7hd4pvF2qmo1lU1(a)mid.individual.net...
> My girlfriend's Golf is having a bit of starting trouble. Basically, the
> starter will spin the engine fairly well, up to about 400 revs or so,
> which if I recall correctly, is about right for a starter. However, the
> engine doesn't catch. Give it a welly full of throttle, and it'll fire and
> then bog down again at around 600rpm, and stall. What it reminds me of
> most is driving an old MK2 Golf with a bunged up ICV / the idle screw
> turned too far in.
>
> Keep giving it a bit of throttle (say, 5 or ten seconds held at
> 1000-1500rpm) and it's fine.
>
> I replaced the breather pipe that feeds from the oil seperator into the
> airbox, so it's possible that the throttle body is gunged up, but I can't
> see why that would cause cold start issues, but not at any other time.
>
> Other candidates are that the throttle body stepper motor has worked out
> of alignment, and finally there's the possibility that there's something
> wrong with the charging system / battery / spark, and there's not enough
> energy to properly ignite a whiff of air and petrol in a cold engine, or
> the alternator is pulling the engine revs down, trying to get some charge
> into a near dead battery. The battery is claiming to be fine, with green
> showing in the window.
>
> Obviously I'll have a bit more idea tomorrow, when I can take the DMM out
> and get some readings for the battery voltage. Any other possibilities?

Check for spark by removing one of the plugs. Also check that the fuel pump
is running while starting, could be a bad fuel pump relay.

SFC


From: Chris Bartram on 17 Sep 2009 05:15
Doki wrote:
> My girlfriend's Golf is having a bit of starting trouble. Basically, the
> starter will spin the engine fairly well, up to about 400 revs or so,
> which if I recall correctly, is about right for a starter. However, the
> engine doesn't catch. Give it a welly full of throttle, and it'll fire
> and then bog down again at around 600rpm, and stall. What it reminds me
> of most is driving an old MK2 Golf with a bunged up ICV / the idle screw
> turned too far in.
>
> Keep giving it a bit of throttle (say, 5 or ten seconds held at
> 1000-1500rpm) and it's fine.
>
> I replaced the breather pipe that feeds from the oil seperator into the
> airbox, so it's possible that the throttle body is gunged up, but I
> can't see why that would cause cold start issues, but not at any other
> time.
>
> Other candidates are that the throttle body stepper motor has worked out
> of alignment, and finally there's the possibility that there's something
> wrong with the charging system / battery / spark, and there's not enough
> energy to properly ignite a whiff of air and petrol in a cold engine, or
> the alternator is pulling the engine revs down, trying to get some
> charge into a near dead battery. The battery is claiming to be fine,
> with green showing in the window.
>
> Obviously I'll have a bit more idea tomorrow, when I can take the DMM
> out and get some readings for the battery voltage. Any other possibilities?
Have you got VAG-COM? I'd do a scan, and clean, re-align the TB to start
with.
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