Author Topic: mk6 golf gti rough idle/firing on 3  (Read 1353 times)

Offline chuck43

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mk6 golf gti rough idle/firing on 3
« on: 30 January 2021, 20:31 »
Hi all,

I have a mk6 golf gti that seems to be running on 3 cylinders. Scanned it with a  mate and it showed cylinder one misfire. Went home, researched, ordered new coils and plugs and have fitted today thinking that would be all done..... Issue is still there.........not throwing any codes now and when ignition is on, each connector of the harness, on pins 1&2 have 12v.

new plugs look sutted up already.

little bit of spec is that has stage 2 remap, final section of induction kit.

im waiting for my new scanner to turn up tomorrow (Autel AutoLink AL519) to try and see if i can read cylinders etc.

any help on where to look next would be much appreciated,

cheers

chuck

Offline ramrod

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Re: mk6 golf gti rough idle/firing on 3
« Reply #1 on: 30 January 2021, 23:16 »
swap the coil from cylinder 1 to another and see if the misfire follows the change... check live data on engine blocks 14,15 and 16 for misfires

instinct tells me its an injector on its way out, best replacing all 4 at the same time
Mk6 Gti - current daily
Mk3 16v Anni - retired daily now parked on 200,300 miles

Offline chuck43

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Re: mk6 golf gti rough idle/firing on 3
« Reply #2 on: 31 January 2021, 15:08 »
yeah was worried be the injectors :)
managed to scan today and and its throwing up all cylinders & p0300 (random/miultiple cylinder misfire detected).

Ive already fitted fresh coils and sparks

Offline ramrod

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Re: mk6 golf gti rough idle/firing on 3
« Reply #3 on: 02 February 2021, 16:53 »
ahhhhh is injectors mate may as well take it to rtech for inlet cleaning and upgraded injectors :wink:
Mk6 Gti - current daily
Mk3 16v Anni - retired daily now parked on 200,300 miles

Offline chuck43

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Re: mk6 golf gti rough idle/firing on 3
« Reply #4 on: 07 February 2021, 20:20 »
Hi,

Just a update really. Last week, i thought id go and try a new PCV valve as when it was running rough, i could hardly remove the oil cap, as in it was mega tight (vacumed on). Ordered new pcv valve, fitted it, issue gone. :]