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Model specific boards => Golf mk3 => Topic started by: MK4D4VE on 18 December 2012, 20:08

Title: VR6 Backfires When Cold, Any Suggestions?
Post by: MK4D4VE on 18 December 2012, 20:08
Hi all

I have a problem with my VR6, in which when it fires on cold start i get one backfire as it starts, and it is quite loud!

The car itself runs fine when started, and runs absolutely fine in the warmer months and only seems to have developed this fault since it has been cold, whats more the revs don't idle too much below 900-1000 rpm as well.

Anyone have any suggestions?

I am picking my new car up in January so don't really want to spend too much money on it, will be selling it very cheap soon.

Thanks

David
Title: Re: VR6 Backfires When Cold, Any Suggestions?
Post by: leigh_harty on 18 December 2012, 20:23
Sounds like an over fueling issue. does it fail to start then bang?
Title: Re: VR6 Backfires When Cold, Any Suggestions?
Post by: tweed on 18 December 2012, 20:38
Fuel pump relay would be my first try
Title: Re: VR6 Backfires When Cold, Any Suggestions?
Post by: VW BUSH on 18 December 2012, 21:08
Go with what's been suggested first, I've had this caused by a blocked/duff injector before.
Worth plugging into a code reader.
Title: Re: VR6 Backfires When Cold, Any Suggestions?
Post by: F17BAD on 18 December 2012, 21:22
coilpack
Title: Re: VR6 Backfires When Cold, Any Suggestions?
Post by: MK4D4VE on 18 December 2012, 21:32
A whole host of possibilities!

If i turn the key to start it, it will die unless i start it with a the accelerator pushed a little to give it a little rev, then it stays started, slightly higher revs but goes bang as well.

Title: Re: VR6 Backfires When Cold, Any Suggestions?
Post by: F17BAD on 18 December 2012, 22:18
coilpack coilpack coilpack
Title: Re: VR6 Backfires When Cold, Any Suggestions?
Post by: MK4D4VE on 18 December 2012, 22:50
Quote from: F17BAD on 18 December 2012, 22:18
coilpack coilpack coilpack

You seem very confident?
Title: Re: VR6 Backfires When Cold, Any Suggestions?
Post by: MK4D4VE on 18 December 2012, 22:55
And I assume you mean ignition coil pack?
Title: Re: VR6 Backfires When Cold, Any Suggestions?
Post by: leigh_harty on 19 December 2012, 08:20
Quote from: F17BAD on 18 December 2012, 22:18
coilpack coilpack coilpack

Mine would fail to start and the exhaust would replicate a shotgun  :grin:

But I had/have fuel pump issues. Coilpack anf spare work and brand new genuine pump relay