Intermittent Starting Not the Same as Any Previous Posts!

4.2 V8 32v Naturally Aspirated - 414 bhp
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Red roof
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Intermittent Starting Not the Same as Any Previous Posts!

Post by Red roof » Sun Sep 19, 2021 6:51 pm

Hi all,
I know the intermittent starting issues have been done to death seemingly but I’ve got an issue that doesn’t seem to have been covered yet.
Usual start process, dip clutch, press start button, no crank, only a loud clicking noise from under the drivers seat area (outside the car, not inside!). Only a single click like a relay or switch making, then breaking when the button is released.
Keep at this for a few goes and hold down the button, the car eventually fires up and runs fine. Cruise control is fully operational.
During one go the EPC light came on and then once the engine settled to idle speed the EPC light went out.
Once she fires up I can stop and start again no worries, it only seems to happen after sitting overnight.
Not got the VCDS on it yet, and I’ve changed the lower clutch switch, I have an upper in stock but reluctant to touch this one as the cruise control is working ok.
I’m thinking starter motor, bad earth or poor connections.
Anyone else know this particular sequence?
Cheers
Garry


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cherub72
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Re: Intermittent Starting Not the Same as Any Previous Posts!

Post by cherub72 » Mon Sep 20, 2021 9:49 pm

Sounds like the starter to me. Mine did similar and was down to corroded wires on the terminal block.
RS4 Cabriolet - Phantom Black with Exclusive interior

Red roof
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Intermittent Starting Not the Same as Any Previous Posts!

Post by Red roof » Wed Sep 22, 2021 10:21 am

Ran a couple of scans which brought up intermittent faults on starter relay and an earth, which I expect to be the starter motor earth.
The EPC light came in and stayed on when out to get a PCR test for travelling back to work, a 4 hour round trip. The scan showed issues with a manifold flap sensor and the MAF sensor.
I’ll get these on order while I’m away, luckily she’s not the daily anymore so my wife need not worry.
In amongst all this I’ve noticed the left aux radiator is leaking so it’ll be an expensive over winter I guess.
Once all is fixed I’ll post up results in case anyone wants reference.
Seems to be one year low cost and one year high.
I can’t bring myself to sell her, nothing can replace the feeling!
Unless of course there is a wildly high offer beginning with a 3
Money talks as they say…..
Cheers
Garry


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m5killer
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Location: LONDON/BULGARIA

Re: Intermittent Starting Not the Same as Any Previous Posts!

Post by m5killer » Tue Sep 28, 2021 4:52 pm

100% starter motor have had the same problem

Vrasheen
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Re: Intermittent Starting Not the Same as Any Previous Posts!

Post by Vrasheen » Mon Oct 04, 2021 5:28 pm

Hi, my b7 rs4 does not start after being parked overnight. There is a relay clicking but no swinging of the engine. But if I hook on the battery charger for 1 minute - the car starts with full power then for the rest of the day there will be absolutely no problem starting. Then next day same scenario. Please help as can't be the battery neither the starter.

Adymars
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Re: Intermittent Starting Not the Same as Any Previous Posts!

Post by Adymars » Tue Oct 05, 2021 3:26 pm

Vrasheen wrote:Hi, my b7 rs4 does not start after being parked overnight. There is a relay clicking but no swinging of the engine. But if I hook on the battery charger for 1 minute - the car starts with full power then for the rest of the day there will be absolutely no problem starting. Then next day same scenario. Please help as can't be the battery neither the starter.
I have the exact same problem on mine. Its crazy. I have no power drain issues. New battery, starter motor checked. ImageImage

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late_voyager
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Re: Intermittent Starting Not the Same as Any Previous Posts!

Post by late_voyager » Sat Oct 16, 2021 9:06 pm

I have exactly the same issue.
Will not start in morning, jump pack etc. Just lucky dip
Read it’s often starter. New one fitted Tuesday
Keep you posted.

late_voyager
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Re: Intermittent Starting Not the Same as Any Previous Posts!

Post by late_voyager » Wed Oct 20, 2021 5:56 pm

Update

Starter replaced
Wow completely different. Starter Motor spins so fast and starts straight away. Clearly hear difference.
Works every time I press button. Even cold in morning

Yea fixed.
£150 plus starter.

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oxblood8
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Re: Intermittent Starting Not the Same as Any Previous Posts!

Post by oxblood8 » Wed Oct 20, 2021 10:12 pm

Nice work mate, sounds similar to what I am experiencing.

Can I ask where you got the starter motor from?

late_voyager
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Re: Intermittent Starting Not the Same as Any Previous Posts!

Post by late_voyager » Fri Oct 22, 2021 9:47 am

It was by luck someone had one but not used in Fb.
Sorry not much help.

Adymars
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Re: Intermittent Starting Not the Same as Any Previous Posts!

Post by Adymars » Sun Nov 14, 2021 11:50 pm

So I've been reading the replies etc to this post. Can anyone explain why my car will not start on the button from cold but as soon as I put a boost pack or jump leads on it fires up no problem and then good for the rest of the day. I can go out the next morning and it will not fire up. Relays changed. Brand new stop start battery. Drain check showed no problems . Very frustrating.

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