Questions tagged [carbon]

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CO and Lambda fail after cleaner, air filter and throttle body clean

Went for an MOT, first test failed on high CO AND HC but normal lambda. Got new air filter, cleaned EGR and throttle body and added a cat cleaner into petrol tank. Second MOT failed due to high CO (...
0
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1answer
48 views

Does driving a car economically damage the engine?

I have a Honda Vezel, which is available only in Japan. The closest (very close) equivalent is the 2016 Honda HRV. It has a 1.5 i-VTEC engine (whatever that means) and a CVT gearbox. The shift has ...
3
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1answer
92 views

Diesel Injector Well full of Carbon

While looking over my friend's 08 Kia Carnival J3 2.9L Turbo Diesel, I noticed a strange huffing noise. After removing the decorative engine cover I discovered this: This injector well is filled ...
2
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3answers
631 views

Will dislodging carbon deposits harm the catalytic converter?

If I use an intake valve cleaner that dislodges chunks of carbon from the intake valves or piston head, and they flow through to the exhaust, could they harm the catalytic converter? I'm interested ...
3
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2answers
2k views

Advice for cleaning an electrically actuated EGR valve

Intro - skip to TL;DR for the main part of the question... I keep getting P0402 errors indicating EGR excessive flow on a VW Golf IV Variant, 1.6 l, 16V, engine code AZD. When warm, the engine ...
7
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3answers
20k views

The Mystery of the Misfiring MINI

It's me again. 2008 MINI Cooper S w/ dealer-installed JCW package (chip tune, larger air intake, larger cat-back exhaust). I thought everything was fine after resetting my ECU last week, but had bad ...
4
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0answers
775 views

Can carbon buildup on a valve seat cause idle surging?

I've got a 1994 BMW 325iC that won't pass smog (for more details, see this thread). I took it to a shop to get both a leak-down and compression test done with some interesting numbers: Cylinder 1 ...
5
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3answers
5k views

Lack of power when cold under load

EDIT 8: Final update, I think. Using an OBD scan tool, I saw that the fuel trims were still very low to adjust for the vacuum leak. I reset the ECU and the trims went back to around 0, and the engine ...
5
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1answer
72 views

New to mechanical work. Is this a safe way to clean oxygen sensor, or any similar part

https://www.youtube.com/watch?v=tD9KXAukO9M So I found this video of a guy cleaning their oxygen sensor out with an ultrasound cleaner. I presume what it is doing is breaking up the carbon build up ...
7
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1answer
423 views

What does a wet intake port (direct injection) mean?

Car: Audi S5 4.2L V8 FSI I have my intake manifold out to clean carbon of the intake ports. When I was removing the port separators, I noticed some were really dry (light grey carbon), others were ...