Misfire 1.8t

[Adamwagg]

Hi guys not started my car all week went to go out today and it's misfiring badly and everytime it's try to come on boost it obviously gets worse I plugged it into vag com and it has come up with misfire from cylinder 1. So will this be a coil pack I only put new plugs in it 4 weeks ago

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[storey618]

yes coil pack or vacuum leak. pull each coil one at a time and see if it gets worse

[Adamwagg]

Vacuum leak??

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[storey618]

boost, vacuum. whatever you want to refer to it as. check the suction jet pump to see if it split

[Adamwagg]

OK mate where would that be located sorry new to the 1.8t

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[storey618]

above the rear of the intake

https://www.ecstuning.com/b-mtc-part...FZKKaQodD1YMzg

[MacFady]

It just sounds like a coil pack to me, I wouldn't jump right on tracing down a vacuum leak before ruling out a coil pack, which is much more straight forward.
Swap the cylinder one coil pack to cylinder 2 and see if the misfire code switches to that cylinder. If it stays on cylinder one inspect the wiring to that cylinder, if the code switches with the coil pack then replace said coil pack. A vacuum leak shouldn't repeatedly cause a cylinder 1 misfire only.

[PreciseD]

Coil pack harness... They are known to fail...

[Shortrun]

Did the fault exist before the new spark plugs?

[Adamwagg]

No not at all

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[PreciseD]

I bet you cracked the wires near the connector when changing out the plugs... It becomes very brittle... Just cut off the rubber boot (carefully) and see if the wires are bare... My money is they are....

[PreciseD]

Like this!!!

[Adamwagg]

Wow of they look like that it means they are knackered yea
Would that not cause multiple misfires

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[PreciseD]

Wow of they look like that it means they are knackered yea
Would that not cause multiple misfires

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It would cause misfires anywhere the wires are cracked at... You can make a new harness pretty cheap and it will last for years to come...

[Adamwagg]

Are the 034 Motorsport harnesses any good is that your engine bay mate

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[PreciseD]

Are the 034 Motorsport harnesses any good is that your engine bay mate

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They are nice but they are the most expensive... I just bought new ends for $15 and crimped them in...

Yes that is my engine....

[Adamwagg]

Cool and you just wired them all up yourself tracing each wire

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[PreciseD]

Cool and you just wired them all up yourself tracing each wire

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Yeah! Just do one at a time (do not cut off all 4)... It is only 4 wires each and you just need to crimp them in place..

Man I hate UK pricing... you guys get ripped off in your country....

http://www.ebay.co.uk/itm/SET-OF-4-A...EAAOSwGotWiSj3

http://www.ebay.co.uk/itm/50-RED-HEA...3D371282719418

[Adamwagg]

Cheers mate tell me about it mate get ripped off on everything mate try running a car over here 😤

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[PreciseD]

Cheers mate tell me about it mate get ripped off on everything mate try running a car over here 😤

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Oh I know.. My dad lived there for 3 years... he would tell me that basically everything is double the price it is here in the states...

[MacFady]

Like I said in my original post, be sure to rule out the bad coil pack before you assume it is a wiring issue. If wiring (which it still may be) I would expect misfires at idle as well (?).

[PreciseD]

Like I said in my original post, be sure to rule out the bad coil pack before you assume it is a wiring issue. If wiring (which it still may be) I would expect misfires at idle as well (?).

He can just move the coil to another cylinder to see if the misfire follows the coil.. If not, it's the harness.. Either way I would still replace the harness... They are mostly all junk by now...

[Shortrun]

No not at all

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Maybe you have a bad spark plug. Try changing that first.

[Adamwagg]

Sorted coil pack cylinder 1 but am going to be doing the re wiring of the packs and do the 2.0l upgrade

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