Is an EGR valve used on these? - Chevy Impala Forums
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post #1 of (permalink) Old 07-14-2019 Thread Starter
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Is an EGR valve used on these?

I was trying to help someone find the EGR vlv. on their '14 Impala LT with the 3.6L since they said they're being quoted $3,400 dollars to clean it since they have to pull the engine. I haven't found the part listed in two places and have only read one mention of an EGR vlv. Do these have an EGR vlv? Is it buried/not readily accessible?

(BTW, another commenter wrote he believed low- and ultra-low-emission vehicles with VVT may not use a valve and obtain the goal by valve overlap (which doesn't seem acheivable to me)).

Thx.
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post #2 of (permalink) Old 07-14-2019
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Originally Posted by LouF View Post
...they said they're being quoted $3,400 dollars to clean it since they have to pull the engine.
I'm not sure whether the 3.6L (LFX) has an EGR valve or not, but that right there tells me somebody's getting their leg pulled. No way I believe that's necessary.


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(BTW, another commenter wrote he believed low- and ultra-low-emission vehicles with VVT may not use a valve and obtain the goal by valve overlap (which doesn't seem acheivable to me)).
Actually, that's beleivable to me. If the exhaust valves are left open at the start of the intake stroke, some burnt exhaust will get sucked back into cylinder which will serve the same purpose.

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The engine removal certainly sounds wrong, but I'm too unfamiliar with this car/engine, and being so crammed maybe it is so.

I guess I do see, now, how using an open exh. vlv. is theoretically possible by the piston downstroke; it didn't visualize to me as well controlled at first. It does sound better. Thx.

If anyone more definitively knows, please advise...BTW, they have 131k miles on the car.
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post #4 of (permalink) Old 07-14-2019
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Originally Posted by LouF View Post
The engine removal certainly sounds wrong, but I'm too unfamiliar with this car/engine, and being so crammed maybe it is so.

I guess I do see, now, how using an open exh. vlv. is theoretically possible by the piston downstroke; it didn't visualize to me as well controlled at first. It does sound better. Thx.

If anyone more definitively knows, please advise...BTW, they have 131k miles on the car.
These two threads (from another forum) indicate there's no EGR on the LFX.

https://www.camaro5.com/forums/showthread.php?t=263811

https://www.camaro5.com/forums/showthread.php?t=371549

HTH.

Doug

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There is no EGR Valve on a LFX 3.6L or most any engine with variable valve timing. In VVT engines, the exhaust cam timing is retarded far enough that exhaust is drawn back into the cylinder at the beginning of the intake stroke for EGR.
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post #6 of (permalink) Old 07-14-2019 Thread Starter
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Thank you, Doug. I came across that site but did not find those posts. I will pass these links on.

Thanks again. Sounds like a good site here, and now I'm a little more up to speed on the 3.6s. ��
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Thank you, Bowtie396! Much appreciated!
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