borescoping the cylinder, suggestions on equipment and also procedure?

[gesTTalt]

I've never scoped an engine before, can I go through the spark plugs holes? I'll be doing a carbon clean in a new couple of weeks to deal with a misfire in one cylinder. I want to check out cylinder that is misfiring. Can I view it through an open valve?

Suggestions for a borescope? See there are different sizes, what works best for the RS engine?

[FaisalJ]

Ha, I asked a similar question a few months back - no responses. I didn't manage to find out in the end. I wanted to check carbon build up in the manifold, before and after a "hydrogen clean" to see if it did anything (it didn't), so slightly different to your goal of seeing inside the cylinder.

I scoped my wife's Mk5 golf GTi intake by going through the hole for the intake temp sensor.

I used a really cheap android borescope, like this: http://www.amazon.co.uk/DBPOWER-Bore...ct_top?ie=UTF8

You can see the video I took on it by connecting to a samsung S5 phone here. Borescope images inside the Golf manifold are at 4:43. Image quality wasn't great, but adequate for what I wanted - gives you an idea what detail you get with one of these cheap cameras. You might want something a bit better to see inside the cylinder with sufficient detail.

https://www.youtube.com/watch?v=4cHXqQywjFY

[komseh]

If you wanted to be a real cheap bastard you could buy one from harbor freight and return it once you're done.

And yeah I would scope it through the spark plug hole with the piston bottomed out.

[gesTTalt]

If you wanted to be a real cheap bastard you could buy one from harbor freight and return it once you're done.

And yeah I would scope it through the spark plug hole with the piston bottomed out.

I think I'd keep the scope. Seems like a fun little gadget that I can use later.

I spoke with the injector cleaners and they said they go up to 100% duty cycle but only at 43 psi. I notice in the other injector threads, the high performance places at 70+ psi testing. My fuel rail pressure is pretty high. I wonder if higher pressure could result in issues on the car but not show in there flow tests.

[gesTTalt]

Ha, I asked a similar question a few months back - no responses. I didn't manage to find out in the end. I wanted to check carbon build up in the manifold, before and after a "hydrogen clean" to see if it did anything (it didn't), so slightly different to your goal of seeing inside the cylinder.

I scoped my wife's Mk5 golf GTi intake by going through the hole for the intake temp sensor.

I used a really cheap android borescope, like this: http://www.amazon.co.uk/DBPOWER-Bore...ct_top?ie=UTF8

You can see the video I took on it by connecting to a samsung S5 phone here. Borescope images inside the Golf manifold are at 4:43. Image quality wasn't great, but adequate for what I wanted - gives you an idea what detail you get with one of these cheap cameras. You might want something a bit better to see inside the cylinder with sufficient detail.

https://www.youtube.com/watch?v=4cHXqQywjFY

I ran across your post and not much in terms of responses. Thought I would give it another shot lol

As for scoping through the manifold, I think you'd have a difficult time with the RS given the intake flaps and port separators. Plus, I think the ait sensor is the back, which isn't easy to get to. I could be wrong though.

[koolade9]

How frequent is your misfire?

[gesTTalt]

How frequent is your misfire?

Only occurs on WOT or heavy load in high gear. If I stay a part throttle, I can keep it from misfiring. Above 5k rpm, minor misfire will occur even at part throttle. At WOT misfires just climbs until it sets off DTc and blinking CEL. No other condition cause it to misfire. Idle and part FT in Bank 2 is 2.3% and 2.3%, Bank 1 is 2.3% and -5.5%.

Swapped coils and plugs. Coils were a bit old, so I opted to buy all new. I also ended up installing new plugs gapped smaller too. I even swapped banks 1 and 2 coils (new coils) after I did a compression test. Cold and dry compression test were 152 +/- 2 psi on all cylinders (had the throttle WOT during each time and cranked until needle stopped)

Injectors were cleaned and flow tested Before, 4 were dripping (#2,3 and 6,7, #6 had the lowest flow). After, all 8 had excellent spray and within 1% of each other. Test were done through 100% duty cycle, but at 43 psi. Shop will look at injector again for me.

I want to check the cylinder walls when I do a carbon clean and swap injector. If this doesn't fix it, I'm a bit stumped at what to check next. Misfire started about 8 weeks ago after doing repeated WOT runs. Car had 16k miles since SC install with no major issues before it started. Since misfires started, been babying the car and working on it. It hasn't been driven much.

[Whatset]

get a cheap one, use on significant other

do science

[koolade9]

What cylinder has the misfire? Your airbox & IM flaps are working properly?

get a cheap one, use on significant other

do science

...boop

[gesTTalt]

What cylinder has the misfire? Your airbox & IM flaps are working properly?



...boop

It's cylinder 6. Airbox aux flap is removed and tube placed to get out of engine bay. I'm sc'd, so no flaps or port separators.

[koolade9]

It's cylinder 6. Airbox aux flap is removed and tube placed to get out of engine bay. I'm sc'd, so no flaps or port separators.

Okay, my bad, I forgot your were blown...that's a whole different ball-of-wax then. Just thinking out loud, but if your compression is good, you're probably not going to find any cylinder scoring. Since you've proven out spark, I would look at air & fuel:

Idle and part FT in Bank 2 is 2.3% and 2.3%, Bank 1 is 2.3% and -5.5%.

-Are you HPFPs original? (I believe there is a part # revision on these as well)
-Have you done a boost leak check?
-Is there a PCV system in place?

I'm just not familiar enough with the ancillary systems on the blower kits, but at high RPM there's a lot of air moving around the engine, not just through it. A boost leak or a clogged PCV system could certainly cause this type of issue...

[gesTTalt]

Okay, my bad, I forgot your were blown...that's a whole different ball-of-wax then. Just thinking out loud, but if your compression is good, you're probably not going to find any cylinder scoring. Since you've proven out spark, I would look at air & fuel:



-Are you HPFPs original? (I believe there is a part # revision on these as well)
-Have you done a boost leak check?
-Is there a PCV system in place?

I'm just not familiar enough with the ancillary systems on the blower kits, but at high RPM there's a lot of air moving around the engine, not just through it. A boost leak or a clogged PCV system could certainly cause this type of issue...

HPFP are new with the AMD internals. I checked fuel rail pressure and it's spot on of actual vs requested.

It is my second PCV. I swapped it about 30k ago. And can't check boost leak as I don't have a boost gauge. I can certainly swap the PCV again

[gesTTalt]

Trying to wrap my head around it being just one cylinder. Think carbon can cause this?

[Peter1.8t]

I'm betting is an injector. Once you go WOT and the duty cycle ramps up it can't maintain flow and just dumps fuel. I've seen that happen before.

[koolade9]

I'm betting is an injector. Once you go WOT and the duty cycle ramps up it can't maintain flow and just dumps fuel. I've seen that happen before.

I could see that. This goes back to the question of if 43psi is really adequate for testing GDI injectors...

You could try swapping injectors between cylinders and see if it follows.

Trying to wrap my head around it being just one cylinder. Think carbon can cause this?

IMO, probably not.

[gesTTalt]

I could see that. This goes back to the question of if 43psi is really adequate for testing GDI injectors...

You could try swapping injectors between cylinders and see if it follows.



IMO, probably not.

Hoping it is the injector. Pressure at my fuel rail is well beyond 43 psi. I can imagine an injector not at 100% wreaking havoc to the AF ratio. I'm tempted not to carbon clean and just swap the injectors. This would confirm the solution, whereas if I CC'd, that may have some influence.

[Smalone01]

I would with out a doubt do a compression check on all the cylinders. I would guess your misfiring cylinder is lower then the others.

[gesTTalt]

I would with out a doubt do a compression check on all the cylinders. I would guess your misfiring cylinder is lower then the others.

I did do a dry compression test - cold engine. Made sure the throttle was wot, 152 +/- 2 psi on all cylinders. Barely any variance in the misfiring cylinder compared to the rest.