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Discussion Starter · #41 ·
So, Cerma engine and Nano treatments ordered (Cerma included a free fuel treatement also) with nice discount using promo code xeperformance (Thanks E9C900a for posting a link in another thread), and catch cans to be ordered this week as soon as I can get in/under the car to find a good mount location so I know what physical size cans to order (as these cars have almost zero room under the hood). Car is still running well, and I want to keep it that way.

Do you recommend running a pressurized intake valve cleaner through to get rid of any possible carbon deposits considering my mileage (88k)? Thanks in advance.

Rich
 

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i recommend venting to atmosphere :)
 
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@Richtazz
Have you borescoped the cylinders to see how much hydrocarbon deposition there is?

Try to avoid using chemical intake cleaners, as the octane of those solutions are very low. Rev the car too much while that stuff is in there and you could blow a head gasket. Yes, this actually happened to someone here.
 

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Discussion Starter · #44 ·
@Richtazz
Have you borescoped the cylinders to see how much hydrocarbon deposition there is?

Try to avoid using chemical intake cleaners, as the octane of those solutions are very low. Rev the car too much while that stuff is in there and you could blow a head gasket. Yes, this actually happened to someone here.
I have not been able to boroscope the cylinders. It is running very well, good power and smooth while driving, 31.8 mpg around town, just an occasional sputter at idle which is why I think there may be some slight deposits in there. How hard is it to remove the intake to inspect/clean the valves from above? Can that be done without removing the head?
 

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I have not been able to boroscope the cylinders. It is running very well, good power and smooth while driving, 31.8 mpg around town, just an occasional sputter at idle which is why I think there may be some slight deposits in there. How hard is it to remove the intake to inspect/clean the valves from above? Can that be done without removing the head?
I plan on doing this soon. Just gotta buy a portable blaster, good compressor, walnuts and a vacuum. I bought a intake port adapter for the vacuum and compressor gun on ebay.

Just gotta remove the intake manifold, tape things up, make sure the valves are closed and blast away. Lots of tutorials on other platforms out there.
 

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Hello all, new member, first post!

I just bought a used 2013 VT, 88k miles, 6 speed manual, well taken care of, clean car-fax. No known mods other than a K&N air filter element in stock housing with stock air intake. Driving home, car developed misfires, worse under hard acceleration. At steady speeds car ran fine, got 34 mpg on expressway trip home. After reading some posts, I changed the spark plugs due to mileage. It seemed to help at first, but misfires returned. Plugs removed had a bit of brown discoloration, but not burned, wet, caked with deposits or any damage to ground electrodes or porcelain. Gaps only slightly larger (maybe 0.035" max) than those on replacement plugs (0.028"-0.030", carefully checked with feeler guage, as I know from my 33 years in the auto parts business that re-gapping Iridium plugs can cause more problems than a few thou variance will) After reading some posts on here about possible coil pack and low-pressure side fuel supply line issues, I hooked up my scan tool. The only codes I have are for misfires, including all 4 individual cylinders (P0301-P0304) and P0300 random, no P0087 low fuel pressure, yet scan tool indicates only 560-580 psi fuel line pressure at idle, and it stays flat with a only a little variance up and down as rpm is increased to around 3500 in neutral (not gonna free-rev it higher than that). Not having much experience with Hyundai (if you need GM vehicle info, I'm your man,...) I humbly turn to you all for help and advice, so as to not throw away money on things not necessary. I ran my VIN on Hyundai's site, and it does not show any recalls or campaigns relevant to it. Thanks in advance for any and all help.
I am having a similar issue. , Just got my injectors back from a flow check shop . We will see if that helped. Stay tuned
 

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I am having a similar issue. , Just got my injectors back from a flow check shop . We will see if that helped. Stay tuned
reviving
but what was the outcome?
 
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