5.4 "Lean Issues" With aftermarket CAI (K&N)

Reply Subscribe

Thread Tools

Search this Thread

06-21-2011, 01:25 AM

#11

Mod (Ret.)

Moderator (Ret.)

Join Date: Sep 2008

Location: Lake Mary Florida

Posts: 9,460

Likes: 8

Received 475 Likes on 375 Posts

I see your concerned about this, but don't you trust the K&N R&D and tech services as well as 4 ASE certified techs you already talked to?

By now you would have had a code if it were running lean.

Last edited by Mod (Ret.); 06-21-2011 at 01:36 AM.

Reply Like

06-21-2011, 10:27 AM

#12

Cormack71

Senior Member

Join Date: Jan 2011

Posts: 986

Likes: 0

Received 16 Likes on 16 Posts

Quote:

Originally Posted by Bucko

I see your concerned about this, but don't you trust the K&N R&D and tech services as well as 4 ASE certified techs you already talked to?

By now you would have had a code if it were running lean.

My truck never threw a code. But. Every time I tried to hit passing gear I would get a lean pop.

Sent from my iPhone using F150 Forum

Reply Like

06-21-2011, 10:58 AM

#13

Mod (Ret.)

Moderator (Ret.)

Join Date: Sep 2008

Location: Lake Mary Florida

Posts: 9,460

Likes: 8

Received 475 Likes on 375 Posts

Quote:

Originally Posted by Cormack71

My truck never threw a code. But. Every time I tried to hit passing gear I would get a lean pop.

Sent from my iPhone using F150 Forum

I went back and read this post again....you never mentioned until now that you are experiencing a "lean pop" when going into passing gear (lean pop are your words).

How do you know this is a "lean pop", meaning a lean condition?

Reply Like

06-21-2011, 11:08 AM

#14

Berg

tow pig

Join Date: Oct 2010

Location: JAX FL

Posts: 85

Likes: 0

Received 1 Like on 1 Post

If my truck starts running lean will it throw a code or no? I have a model stock intake tube and the gotta mod along with magnaflow SI/SO .

Should I wait for it to pop a code or just go get the PCM flashed? My mechanic is cool and probably wouldn't even charge me to reflash but don't want to do it if I don't need it

Reply Like

06-21-2011, 01:05 PM

#15

Cormack71

Senior Member

Join Date: Jan 2011

Posts: 986

Likes: 0

Received 16 Likes on 16 Posts

Quote:

Originally Posted by Bucko

Lean pop is what the Ford Service called it when I took it in. It sounded like the pop of a carbureted motor. Said it was caused by CAI and my exhaust. I took it to a local engine shop and he programmed my computer. Changed the air/fuel mixture, the shift points, and put it on the dyno. 366hp.

Sent from my iPhone using F150 Forum

Reply Like

06-21-2011, 01:53 PM

#16

07harleyD

Senior Member

Join Date: Sep 2009

Posts: 132

Likes: 0

Received 1 Like on 1 Post

Running lean will cause detnation, that's probably what the mechanic meant when he said "lean pop". I have had countless problems with my truck running lean with my supercharger set up and no! it won't always throw a code. I have a misfire on #5 and my truck is running lean, I have had mine into the dealer a few times with the problem now and they can't even figure it out.