Carbon Buildup @ 80k - Before and After Photos

[Ridebjj]

Has anyone documented the borescope procedure for Getting a good look at all 8 valves? Iirc, the flaps and other things are an impediment. Do you need an above average scope?

 

[jimlloyd40]

Has anybody who was running a PCV delete OCC system had to do the cleaning with mileage as low as some of you have posted? I've had my OCC since the car was new and I'm at 55,000 miles and no misfires or other symptoms.

 

[Faceman]

Has anybody who was running a PCV delete OCC system had to do the cleaning with mileage as low as some of you have posted? I've had my OCC since the car was new and I'm at 55,000 miles and no misfires or other symptoms.

If you don't me asking, which one?

 

[Hoon]

I tried to bore scope mine and couldn't. Between a cheap scope and the flaps it was impossible to find my way to the valves.

Sorry for the lack of an update. It's now been 3 months and I CAN CONFIRM that per my OBDeleven, I have not had any misfires since the cleaning!

I'm pretty thrilled, and I think this means that for my specific car, the carbon was 100% causing the misfires and the cleaning fixed it. I'm now at approximately 83k miles (3k miles after cleaning).

I had severe.misfires starting at 45k. I changed the plugs and coils, even tried a fuel injector cleaner. I was even going into limp mode at times and had a very rough idle. My dealer removed the carbon and now car is running like new.

Stija says you're wrong. Lol

Has anybody who was running a PCV delete OCC system had to do the cleaning with mileage as low as some of you have posted? I've had my OCC since the car was new and I'm at 55,000 miles and no misfires or other symptoms.

Over 50k on mine, never ran an OCC until very recently. Valves were very clean. They all had small donuts of carbon around the stems, but the heads of the valves and the ports themselves looked great.

Top tiers fuels and a hard life seem to work well. Now MPI and E85 will clean it right out.

 

[jimlloyd40]

I tried to bore scope mine and couldn't. Between a cheap scope and the flaps it was impossible to find my way to the valves.





Stija says you're wrong. Lol



Over 50k on mine, never ran an OCC until very recently. Valves were very clean. They all had small donuts of carbon around the stems, but the heads of the valves and the ports themselves looked great.

Top tiers fuels and a hard life seem to work well. Now MPI and E85 will clean it right out.

No doubt the MPI and ethanol is helping a lot.

 

[jimlloyd40]

If you don't me asking, which one?

Spulen bought from ECS on sale.

 

[eajr]

I tried to bore scope mine and couldn't. Between a cheap scope and the flaps it was impossible to find my way to the valves.





Stija says you're wrong. Lol



Over 50k on mine, never ran an OCC until very recently. Valves were very clean. They all had small donuts of carbon around the stems, but the heads of the valves and the ports themselves looked great.

Top tiers fuels and a hard life seem to work well. Now MPI and E85 will clean it right out.

I have babied my Gti for the majority of its life, with some occasional (and somewhat limited) spirited driving. My dealer instructed me to drive it harder more often to prevent further carbon buildup

 

[Hoon]

No doubt the MPI and ethanol is helping a lot.

Now, yes.

When I saw the valves it was during the MPI install.

 

[2slowvw]

Now, yes.

When I saw the valves it was during the MPI install.

How much can we expect MPI to clean these valves off. Will they slowly wear down the carbon, or if its too thick it will still need manual cleaning?

I have MPI, planning on maybe installing this weekend. Will get a look at the valves then.

 

[yakev724]

Sharing my experience since no one in my family seems to appreciate how nice it feels to have shiny valves.

1st photo - buildup after 115k, stock. Worst cyl.

2nd photo - buildup after 5k of MPI (inc. hybrid turbo, LPFP). Noticeably cleaner.

3rd photo - after blasting (diff cylinder but all ended up the same)

 

[Mosquito]

Curious, what MPI injectors are you using?
CTS/APR or something like PR?

 

[Diggs24]

Looks like mpi did a great job in just 5k.

 

[yakev724]

Curious, what MPI injectors are you using?
CTS/APR or something like PR?

Bosch 0280158040 (~1000cc) in an otherwise OEM setup (minus the harness).

I think those kits all use similar injectors.

Looks like mpi did a great job in just 5k.

For sure - was pleasantly surprised. Track time might have accelerated the process as I think my tune has MPI come on at 5k rpm, I rarely get there on the street.

 

[Mk7Matt]

@yakev724 Curious as to why you decided against wallnut blasting/manually cleaning the values when you went MPI. I've been holding off on my carbon cleaning until I'm ready to go MPI.

 

[yakev724]

@yakev724 Curious as to why you decided against wallnut blasting/manually cleaning the values when you went MPI. I've been holding off on my carbon cleaning until I'm ready to go MPI.

I don't have a garage