LCR great missfire mystery - help needed

[jonathanp]

exhaust manifold

It was pretty much the only thing left, lol.

Then investigating further I found other users with similar issues. I feel a bit stupid for not thinking of it earlier to be honest, problems only started after the manifold was fitted and now its been replaced they've gone away.

Its like the quote says

"Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth"

 

[CupraTim]

Well it's going to Abtech tomorrow (my local VAG specialist) I'm towing it there tonight so they can run a diagnostic and tell me what's wrong.

 

[Claki]

I reckon an Ever so slightly bent Rod. Thats just my 2 cents worth anyway. judging by some of the other threads on here... likely. if you havnt checked already.

 

[wild willy]

exhaust manifold

It was pretty much the only thing left, lol.

Then investigating further I found other users with similar issues. I feel a bit stupid for not thinking of it earlier to be honest, problems only started after the manifold was fitted and now its been replaced they've gone away.

Its like the quote says

"Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth"

Great to hear its finally sorted mate.
How does the car feel now, did the xs mani give it any xtra omph that you can feel.

 

[jonathanp]

Great to hear its finally sorted mate.
How does the car feel now, did the xs mani give it any xtra omph that you can feel.

Definitely now I have the ebc back on running around 23 psi. I need some time to see how much I can push it.

At the moment highest egt's on the road are 860 and no timing pull.

I forget how quickly you run out of road when logging.

At Bills it was making 293 on 18psi without wmi. Hopefully I'll get it all setup soon and I'll post up the logs.

Btw Carl do you get boost creep on your hybrid?

 

[wild willy]

Definitely now I have the ebc back on running around 23 psi. I need some time to see how much I can push it.

At the moment highest egt's on the road are 860 and no timing pull.

I forget how quickly you run out of road when logging.

At Bills it was making 293 on 18psi without wmi. Hopefully I'll get it all setup soon and I'll post up the logs.

Btw Carl do you get boost creep on your hybrid?

I don't get boost creep no, i think its because i have the stock turbine so it cannot generate too much flow mid revs.
293 @ 18psi is impressive, @ 23 psi it must pull like a train.

 

[ibizacupra]

probably more like compressor vs turbine is a more even ratio.. 2283 comp wheels are very compressor heavy flow wise..

 

[Nautilus]

After 7 years of 1.8T experience, I'll drop my 2 pence on the way:

Our engines due to their design are among the most "steampunk" modern engines - a maze of pipes for air, vacuum, fuel, spent gases, crankcase gases, oil, coolant worthy of an overly complex steam locomotive. While being at the same time very hot running. They may read 90°C of temp in the coolant and oil, but the exhaust side of the block and cylinder head are horribly hot and the engine bay is like a baking oven.

For this reason, the pipes and hoses are the first to go bust, second is the wiring insulation, and third the sensors. Only afterwards are major engine parts at risk.

So if the VAG-COM can't point to any logical reason for the engine issue, I'd try to track first the entire length of pipework (down to both manifolds, just as the K04 exhaust manifold cracks, the intake manifold may break or degrade the stock gasket from continuous hot-cold cycles and leak boost).

People who invented the pressurization of the 1.8T inlet system with a compressor and a makeshift plug might have looked funny, but they had a reason.

~Nautilus

 

[aledglyn]

my lcr 225 has same misfire probs on high load, changed all same parts and has totally confused me. the weird thing is if I disconnect the o2 sensor in the manifold the misfire wont occur at all, makes me think it the fuleing or knackerd ecu.

 

[ibizacupra]

this was caused by jbs ex manifold.
unless you run the same, i doubt yours has same issue

cyl leak down check to confirm if valves are seating ok..
check your coilpack wiring also, it can crack and age where it lives.. hot hot hot place