2008 FN2 Engine boggy when coming off throttle - Civinfo
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post #1 of 14 (permalink) Old 19th February 2017, 22:27 Thread Starter
 
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2008 FN2 Engine boggy when coming off throttle

Hi everyone, its my first post here.

I have 2008 FN2 and recently the engine seems to be a bit sluggish when cruising at a constant speed or when coming off the gas. The revs don't seem to drop down as smooth as they used too, at least that's how it feels. Its a bit like driving a car with choke on, on a cold morning.

But the car accelerates fine and idle's fine too.

I've replaced the spark plugs, air filter and also tried a add to fuel ignition system cleaner but still have not solved the issue.

Any ideas please?
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post #2 of 14 (permalink) Old 19th February 2017, 22:52
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hi there usualy on the k20 engine in the crv and accord a dirty throttle body gives simptoms like this
it might be worth removing the throttle body and giving it a good clean with some carb cleaner or brake cleaner
when the throttle body is off you might as well clean the idle control valve stepper motor as these can gunk up as well
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post #3 of 14 (permalink) Old 19th February 2017, 23:22
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Are you talking about the air assist valve? There's no iacv on the fn2.
OP, are there any modifications? Welcome btw
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post #4 of 14 (permalink) Old 19th February 2017, 23:30
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hi there the fn2 might have a different throttle body set up
as the accords use the lower power version of the k20 engine with ivtec
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post #5 of 14 (permalink) Old 19th February 2017, 23:56 Thread Starter
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Thanks everyone for replying. No modifications have been made to car.

I've been doing a bit more reading and I'm starting to think it could be a PCV Valve, another guy had very similar symptoms to me. Could it be? I'll check it out tomorrow and see if anything obvious is wrong.
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post #6 of 14 (permalink) Old 20th February 2017, 00:07
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The pcv valve is located to the left of intake manifold, the pipe runs from the centre of the intake manifold to the pcv valve. Usually you will hear a kind of gurgling/rasping sound on tickover. If you squeeze the pcv pipe and the noise disappears this usually indicates a faulty pcv valve. I replaced mine last year.
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post #7 of 14 (permalink) Old 20th February 2017, 12:34 Thread Starter
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I've checked valve and its making the same noise as others have reported. I made a video showing the sound change when the hose connecting to the pcv valve hose is pinched.


Would the pcv valve be a cause of the engine running problems I've described?
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post #8 of 14 (permalink) Old 20th February 2017, 12:41
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Possibly. Are you using more fuel or oil than normal?
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post #9 of 14 (permalink) Old 20th February 2017, 12:57 Thread Starter
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No, nothing seems to have changed recently aligning with the engine issue. The car has used more oil overall in the past few years and I've had to top it up a few times.
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post #10 of 14 (permalink) Old 21st February 2017, 12:10
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Quote:
Originally Posted by flashy View Post
Possibly. Are you using more fuel or oil than normal?
I am... and have the same symptoms as described. Would this be PCV valve do you think? It's noisy as hell anyway!

Sorry for small thread hijack mate
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post #11 of 14 (permalink) Old 21st February 2017, 12:18
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Definitely change it if you have done the test to confirm the pcv valve is faulty. Cox do the kit for 40 quid. Here's the valve...old and new.
Attached Images
File Type: jpg 20160517_132906.jpg (50.9 KB, 33 views)
File Type: jpg 20160517_133735.jpg (42.0 KB, 29 views)

Last edited by flashy; 21st February 2017 at 12:22.
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post #12 of 14 (permalink) Old 21st February 2017, 14:08 Thread Starter
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I've just picked up the valve only from my local dealer for 25.72. I'll check the hose but I think its okay.

Going to fit it now, fingers crossed.
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post #13 of 14 (permalink) Old 21st February 2017, 14:16
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The aircon pipe will get in the way
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post #14 of 14 (permalink) Old 21st February 2017, 16:15 Thread Starter
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Ok. I've replaced the valve, its a bit fiddly but got it done.

You can hear the new valve working when the hose is squeezed now, sounds like a little suction sound and before it
made that rasping squeeling type noise.

The engine is running better when coming off the gas, not quite perfect but definitely feels much better.

Thanks for all the help Flashy & Everyone.
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