1.8t BAM misfire problem

AceD909

Active Member
Jan 16, 2024
49
13
Yes, the 1.8T is susceptible for boost leaks with the elaborate PCV system
I tested the car again, runing good now and no more leaks just the VVT gasket. But i don't have VCDS at the moment to check the fuel trims.
I will clear codes and check for misfires and also the fuel trims, will post the results here.

Questions:
Because i can't find the PCV hose, can i do it with 2 hose connectors and silicone hose?

Can the VVT gasket be changed without taking apart the camshafts?
 

nd-photo.nl

Active Member
Mar 6, 2012
4,149
324
The Netherlands
youtube.com
This is how it looks. The hockey puck is not on this picture

x3kdt62.jpg


Information for simplification: https://www.uk-mkivs.net/threads/1-8t-pcv-simplification-and-catch-can-installation.17685/
 

ExiledWeegie

Active Member
Jun 15, 2024
99
62
Fife, Scotland
that hose is available on amazon or ebay, its a common part.

regards the vvt gasket, you need to de-tension the chain using the tensioner tool, then you can lift it up around an inch which gives enough room to get in and replace the half moon and tensioner gaskets.
 

AceD909

Active Member
Jan 16, 2024
49
13
that hose is available on amazon or ebay, its a common part.

regards the vvt gasket, you need to de-tension the chain using the tensioner tool, then you can lift it up around an inch which gives enough room to get in and replace the half moon and tensioner gaskets.
Yeah the hose is available on amazon or ebay, but in Macedonia is almost impossible to get it shipped.

The vvt gasket will be changed in couple of days.
Thank you for the info, not needing to take all apart is good.
 

AceD909

Active Member
Jan 16, 2024
49
13
Sorry bro, was looking at the wrong diagram lol.
No worries mate, today i cleared codes and checked the fuel trims, the block 32 now has 2.5% Adaptation(Idle) and no misfires at all.

With MAF connected the boost pressure is lower than expected at 0.7bar, peeks at 1.2bar drop to 0.7bar holds there and drops to 0.5bar at rev limit.
The car is running very smooth on idle and driving.
Boost meter shows at idle -0.7bar.

What could be the cause?
 

mty12345

Active Member
Jun 17, 2011
4,060
655
bristol
No worries mate, today i cleared codes and checked the fuel trims, the block 32 now has 2.5% Adaptation(Idle) and no misfires at all.

With MAF connected the boost pressure is lower than expected at 0.7bar, peeks at 1.2bar drop to 0.7bar holds there and drops to 0.5bar at rev limit.
The car is running very smooth on idle and driving.
Boost meter shows at idle -0.7bar.

What could be the cause?
Boost is always gonna drop off towards the rev limit as the turbo can't flow enough air to keep up.

Depends what boost the map is asking for, you can log actual boost vs requested boost. I think it's group 115, but other than that sounds pretty healthy to me.
 

AceD909

Active Member
Jan 16, 2024
49
13
Boost is always gonna drop off towards the rev limit as the turbo can't flow enough air to keep up.

Depends what boost the map is asking for, you can log actual boost vs requested boost. I think it's group 115, but other than that sounds pretty healthy to me.
Same here, my stage 2 with 261bhp 395Nm was peaking at 1.3 bar (stock k03s turbo). But best way is to log it like @mty12345 mentions
Yeah, the boost drop at rev limit is fine, but why it has lower requested boost?
Actual boost is pretty close to requested.
Before it was 1.2bar peak drops to 0.9bar(which is stock for BAM) and on rev limit will drop to 0.7bar.
I will do some logs, ME7Logger or VCDS i can provide both if needed
 
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