2013 FR-S Misfire and Rough Idle

[aemravan]

Thanks man. I'll try and get it pressurized via the compressor tester I have, I think my vacuum hose on the compressor has the same fitting. HOpefully I can trace it to an intake valve issue.

I spoke with the toyota customer care center on the phone today and the lady told me it shouldn't be an issue to get the recall done as the VIN number did show up as eligible even though the car is salvaged. She then got me in contact with the local dealer who scheduled for me to get it there Saturday morning "to inspect for recall and order parts if needed"



I'll need to be 95% sure this issue is recall related before taking it saturday as the car will need to be towed and I'd hate to pay a tow bill 2 ways plus not get any results from the dealer.. So I guess time will tell..

[aemravan]

so I found my issue....



took off the intake manifold to do a leak-down test, started inspecting the valves and had my fiance roll the motor over slowly... well... cylinder 3 the left hand intake valve does not move/moves just barely while the right one strokes all the way open and closed.



Not too familiar with these heads but I believe the valves are operated through some sort of a rocker? Question now is whether or not this could be directly related to the valve recall or not... now to get the car to the dealer saturday and see what happens..

[RZNT4R]

It's possible.

The rocker and valve shim are held in place against the camshaft by the pressure from the valve spring. If the spring failed it's possible that the shim dropped out from under the rocker or that the rocker itself is misaligned. But that would hardly explain the low compression, at cranking speed, you're going to get a good cylinder fill from just one valve, that valve may not be seating well anymore. If you've still got the intake off, rotate the engine so no.3 is at compression TDC (all 4 valves closed), put some air in it and spray some soapy water on the closed valve.

[aemravan]

Well the problem is I can tell the valve isnt all the way seated.. and even without soap and water I can hear it leaking large amount of air.
Not sure if the valve is seized or not but I'm not looking to try to move it and make the issue worse. At least thr car fires up right now so I'll just throw it back together and let Toyota figure out and let me know what they find.

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[RZNT4R]

Ah so if it's visible not seating that's that then, it's probably safe to assume the spring failed and didn't close the valve in time, so it kissed the piston and got a little bendy.

[aemravan]

Originally Posted by RZNT4R

Ah so if it's visible not seating that's that then, it's probably safe to assume the spring failed and didn't close the valve in time, so it kissed the piston and got a little bendy.

That's what I am thinking too.. I'm assuming these are interface motors? I probably should have done a bit more research before diving head-first, but here I am

Now to hoping that it really is a failed spring and that the recall takes care of whatever other damage may have been caused but from reading all the horror stories over the past week I am not too optimistic about a smooth transaction with the dealer this weekend... I haven't come across a thread where the car had already suffered a spring failure prior to going in for the recall work so I'm not quite sure what to expect..

[aemravan]

the surprising thing is that I haven't shot a rocker out of the valve cover, not does it sound too terrible (like its eating itself up in the head) when running which I find odd... the valve just isn't moving.. but I won't mess with it and just close it up. Already have a trailer scheduled for saturday morning to get it towed up there for inspection.

[aemravan]

Rented a borescope today just to take a quick glance inside before it goes to Toyota to make sure there aren't any surprises.

First pic is cylinder 3, problem one, the other one is cylinder 1. I would say there was definitely contact to the valves...

Now it will be interesting to see what happens with the recall.. I hope they dont try to pull the "well it should have been fixed when the recall came out " card.

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[RZNT4R]

Originally Posted by aemravan

Now it will be interesting to see what happens with the recall.. I hope they dont try to pull the "well it should have been fixed when the recall came out " card.

It's their job to contact you for the recall, they can hardly blame you if you haven't received the letter.

[maslin]

The picture of the pistons doesn't necessarily show what you think. Especially with fire going the wrong way back out the cylinder on every stroke.

You need a borescope with a 90* head to look at the valve in the cylinder. You'll be able to see the valve closed on one side and open toward the center.

We deal with recalls on salvage title cars from time to time. Never had a problem with it.

[aemravan]

Thanks for the input man.

With regards to the a 90 degree scope, I agree that I'm not able to see the valve from the cylinder end. I do see a visible gap between the valve and seat when it should be closed. you're right now, doesn't necessarily mean that its bent as that was my initial impression.



Got a trailer coming tomorrow at 6 a.m. to get to toyota at 7 for the initial round of what they said they need to do. "It will need to be inspected so that parts can be ordered" Not exactly sure what inspection it will go through, guessing probably just a VIN verification/check. Hopefully they have no issue with me leaving the car there for the duration.



With regards to the salvage title, I am not as concerned about the title portion itself as I am about the car not even being registered to me yet. It is still under the shop/dealer that I bought it from the auction. I can't get it sold/transfered to me until we do a state pre-inspection of damages and then a final inspection of damages fixed prior to it being able to be signed over to me.


But time will tell. I will certainly keep the relevant threads updated with what I come across.



I did change the oil just in case to inspect it, and did not find anything what I would consider abnormal as far as metal shavings/shiny reflections.

Thanks for all the input thus far.

[mswbrz]

Try new ignition coils and a compression test . I have a Wrx that was missing on third cylinder , I had swapped the coils around thinking the misfire would move to diff cylinder , it didn't . I ended buying new plugs and coils and it fixed the misfire with a much smoother idle .
Compression test can be a lil pricy 1-2 bills but it will at least tell you a bit more ie if you have a cracked cylinder , bad head ect
Try finding cheap used coils to try and see if that helps any ?


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[aemravan]

Well both are already done. The intake valve is clearly not moving and isn't fully closed.

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[RZNT4R]

Originally Posted by mswbrz

Try new ignition coils and a compression test . I have a Wrx that was missing on third cylinder , I had swapped the coils around thinking the misfire would move to diff cylinder , it didn't . I ended buying new plugs and coils and it fixed the misfire with a much smoother idle .
Compression test can be a lil pricy 1-2 bills but it will at least tell you a bit more ie if you have a cracked cylinder , bad head ect
Try finding cheap used coils to try and see if that helps any ?


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