Author Topic: fix options for low compression MKV 1.4 TSI Twincharged  (Read 837 times)

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Offline Lemieux_66

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fix options for low compression MKV 1.4 TSI Twincharged
« on: May 16, 2017, 12:50:48 pm »
Hi all,

I live out in Muriwai Beach, so had hometune come out after developing a misfire on the motorway on the weekend. (Tried new coil/plug myself)
My MKV 1.4 twincharged TSI has been diagnosed with low compression in Cylinder 3. The guy thinks its a broken piston as they're pretty common apparently.

Is there anyone out there that you guys recommend I have a chat to, or what would be my options?
Any idea what cost i'd be looking at for a replacement engine or keeping current block etc and getting someone to install new pistons etc?

Cheers,




« Last Edit: July 05, 2017, 03:51:45 pm by Lemieux_66 »

Offline Naekyr

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Re: fix options for low compression MKV 1.4 TSI Twincharged
« Reply #1 on: May 16, 2017, 03:45:19 pm »
Other forums with same issues

http://www.vwgolf.net.au/showthread.php?24408-Need-Advice-for-my-friend-s-Golf-GT-1.4-TSI-with-CEL.

http://www.vwwatercooled.com.au/forums/f15/mkv-1-4-gt-low-compression-cylinder-2-a-116269.html

Overall suggesting is to get more tests as it could be the exhaust valves, cylinder seals, timing chain, either is cheaper than a cracked piston, although it would appear cracked pistons are common on that engine
« Last Edit: May 16, 2017, 08:19:32 pm by Naekyr »

Offline 80 Vert

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Re: fix options for low compression MKV 1.4 TSI Twincharged
« Reply #2 on: May 16, 2017, 07:52:30 pm »
More than likely timing chain problem causing valve and or piston damage.
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Offline GLIDN

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Re: fix options for low compression MKV 1.4 TSI Twincharged
« Reply #3 on: May 17, 2017, 09:04:45 am »
More than likely timing chain problem causing valve and or piston damage.

I concur - this is the most likely issue.

This would be the next check - Done b doing a leak down test.
Usually also caused by 91 octane fuel allowing these engines to ping their heads off. Eventually ending up in damaged landing rings on the pistons.
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Offline Lemieux_66

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Re: fix options for low compression MKV 1.4 TSI Twincharged
« Reply #4 on: May 17, 2017, 01:20:00 pm »
Cheers guys.

it's done 170k now and 140k when I got it about a year ago.   I've used 95/98 (apparently it was tuned to use 95) but no idea what it's had used before.

It did "ping or knock every now and then under load but nothing that had me worried.  I'll check out a leak down test, maybe someone in my area would be able to sort that out.

Offline Lemieux_66

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Re: fix options for low compression MKV 1.4 TSI Twincharged
« Reply #5 on: May 22, 2017, 01:02:37 pm »
Had another guy who is a VW/Audi mechanic out for the leak test and also poke a endoscope down the cylinder, showed me insides and said there is no damage to the top of the piston from valves or marks/scratches on the cylinder walls and that oil is leaking past the piston rings causing the compression loss. 

He said 4 new pistons should sort it out and has given my number to someone that can do the work.  Hopefully hear from that guy soon or i'll need to ring around.    As the car's done so many KM's he said its best to change all 4 pistons instead of just the one, I assume that's correct as I wouldn't want to go through this again if I just get one changed. 



« Last Edit: May 29, 2017, 04:13:17 pm by Lemieux_66 »

Offline Lemieux_66

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Re: fix options for low compression MKV 1.4 TSI Twincharged
« Reply #6 on: June 08, 2017, 11:24:21 am »
UPDATE : Car's getting worked on now, and just got sent these beaut pics.    No damage to the cylinder walls or valves/head apparently. new parts should be going in this weekend.








« Last Edit: June 08, 2017, 11:34:17 am by Lemieux_66 »

Offline McDoof

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Re: fix options for low compression MKV 1.4 TSI Twincharged
« Reply #7 on: June 08, 2017, 01:17:35 pm »
Ouch
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Offline Filx

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Re: fix options for low compression MKV 1.4 TSI Twincharged
« Reply #8 on: June 08, 2017, 01:36:14 pm »
Wow, massive chunk of piston gone and no damage to cylinder walls, valves or the head!!! That's amazing luck!
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Offline Lemieux_66

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Re: fix options for low compression MKV 1.4 TSI Twincharged
« Reply #9 on: June 08, 2017, 02:07:21 pm »
Wow, massive chunk of piston gone and no damage to cylinder walls, valves or the head!!! That's amazing luck!

I guess we find out when it all goes back together, but he sounded pretty confident.   I find it a bit weird that the other person that used the camera down the cylinder couldn't see that piece missing. maybe he was too focused on the walls and only looked at one side of the piston.

Offline Worms

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Re: fix options for low compression MKV 1.4 TSI Twincharged
« Reply #10 on: June 08, 2017, 03:29:20 pm »
As the car's done so many KM's he said its best to change all 4 pistons instead of just the one

HAHA! "so many KM's".

Makes it sound like it's done enough to warrant this type of failure... It's a shame that VW has ended up making so many crappy engines "recently". It's sure not like the old days!

I've had a number of cars with 275, 325, 420Kms etc, that never had the engine apart, not used oil, ran quietly etc.

You must be stoked it's not a complete failure though! It's really surprising that chunk didn't jump around in the cylinder, or detroy the turbo etc on it's way out!

Good work!

Offline McDoof

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Re: fix options for low compression MKV 1.4 TSI Twincharged
« Reply #11 on: June 08, 2017, 04:01:24 pm »
Are cars really only built to go for 200k now? It seems like it. Anything with a turbo attached to it in any case.
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Offline Naekyr

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Re: fix options for low compression MKV 1.4 TSI Twincharged
« Reply #12 on: June 08, 2017, 05:05:12 pm »
Lol from what I can tell if your modern turbo car gets to 200k then you're lucky, love my gti but I don't trust it at all, will be selling prior to 100k km

Offline GLIDN

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Re: fix options for low compression MKV 1.4 TSI Twincharged
« Reply #13 on: June 08, 2017, 06:37:15 pm »
We did call it I guess. But at least it's getting resurrected. Which is awesome to see indeed.

Lol from what I can tell if your modern turbo car gets to 200k then you're lucky, love my gti but I don't trust it at all, will be selling prior to 100k km

If a car is stock or at the very least tuned well?
Cars can run for high mileage.

Mk4 GTI was sold @ 298,000kms still on clutch installed @ 90,000kms by previous owner. Tuned and running 20psi boost. Had the car for 7 years.
MK5 GTI close to 200,000kms, still on original engine, gearbox, clutch packs and turbo. Running peak 22psi boost. 5 years later, nothing but serviceable parts only.

So that might ring true for a crapanese car. Thankfully these GTI's are fairly reliable.

The biggest issue with the TSI engine of above? IS ran too lean from factory. Then get told by idiots at car yard you can run 95 or even 91 octane. When they ping even with 98 on factory tune. The timing chain tensioner issue due to low oil pressure, indeed did not help the cause either.

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Offline McDoof

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Re: fix options for low compression MKV 1.4 TSI Twincharged
« Reply #14 on: June 09, 2017, 08:55:25 am »
A mate of mine has a 1.4TSI and just had to have the timing chain replaced. Apparently it was stretched and so the timing was out more than the VVT could compensate for. So another timing chain issue.
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