Rough Idle and misfires at Idle only. Please help diagnose.

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Apr 16, 2020 | 11:13 PM

#11

Jason_B

Thread Starter

Winching

Joined: Dec 2009

Posts: 517

Likes: 62

From: Oceanside CA

Quote:

Originally Posted by redwhitekat

Had this happen.
Take out your purge valve and plug the intake port
sometimes the purge valve sticks open and let’s vapours go into your intake causing havoc on fuel air mixture and really rough idle at times

YESSS! I love proposed solutions! Now I need to find the purge valve

I will do this tomorrow and report back!

Edit: okay it looks like it is right under the IACV. So what is the fix, take it out permanently?

Okay I am going to order this, looks like it will fit in: https://www.hyundaipartsdeal.com/gen...910-22040.html

Last edited by Jason_B; Apr 16, 2020 at 11:20 PM.

Apr 16, 2020 | 11:13 PM

#12

Jason_B

Thread Starter

Winching

Joined: Dec 2009

Posts: 517

Likes: 62

From: Oceanside CA

Quote:

Originally Posted by The Deputy

Yeah, l'd dump some injector cleaner in and drive it like you stole it. I'd even start fresh by clearing any codes, after making note of active ones.

What is your favorite type of injector cleaner? I assume it's a fuel additive? Thanks!!

Apr 16, 2020 | 11:42 PM

#13

Best4x4

Super Moderator

Joined: Apr 2015

Posts: 7,987

Likes: 2,499

From: Beaumont, TX

OEM Hyundai Purge Control Valve

Much better deal for ya!

Apr 17, 2020 | 02:54 PM

#14

redwhitekat

TReK

Joined: May 2011

Posts: 2,768

Likes: 396

From: kitchener, canada

Quote:

Originally Posted by Jason_B

YESSS! I love proposed solutions! Now I need to find the purge valve

no not permanent just take it out and plug the vacuum port on the intake
results should be immediate
the ecu will throw a code after a bit of driving if you leave the purge valve unplugged

Apr 17, 2020 | 04:36 PM

#15

The Deputy

Camel Trophy

Joined: Oct 2016

Posts: 4,867

Likes: 1,410

From: Michigan

Quote:

Originally Posted by Jason_B

What is your favorite type of injector cleaner? I assume it's a fuel additive? Thanks!!

Techron, Royal Purple, Lucas, STP...in about that order. I've used them all...and truth be told...they all seemed to work as expected.

Brian.

Apr 17, 2020 | 04:54 PM

#16

11chuck

Mudding

Joined: Dec 2019

Posts: 139

Likes: 32

If you get rid of the magnaflow exhaust I'll take it off your hands for no charge. I could probably even cover half the shipping cost. Lmk

Apr 17, 2020 | 05:08 PM

#17

Jason_B

Thread Starter

Winching

Joined: Dec 2009

Posts: 517

Likes: 62

From: Oceanside CA

Quote:

Originally Posted by 11chuck

If you get rid of the magnaflow exhaust I'll take it off your hands for no charge. I could probably even cover half the shipping cost. Lmk

I like the idea but you want me to pay 1/2 the shipping and shift it to you for free?

Apr 17, 2020 | 09:32 PM

#18

XRAD

Pro Wrench

Joined: Feb 2019

Posts: 1,288

Likes: 445

someone on another thread with rough running had a knock sensor/sensor wire issue.......

Apr 17, 2020 | 11:20 PM

#19

11chuck

Mudding

Joined: Dec 2019

Posts: 139

Likes: 32

Quote:

Originally Posted by Jason_B

I like the idea but you want me to pay 1/2 the shipping and shift it to you for free?

I'm kidding of course lol. Unless you really want it gone...

I actually run a muffler delete pipe (big center one, not the back resonator) I bought from the UK, which is why I mention your problems shouldn't be attributed to the exhaust. I'm assuming by exhaust you mean the catback right? Magnaflow also makes Y pipes with high flow cats. I like the way the exhaust tips come out the back on their system, really gives it a cleaner look.