Is this to Lean of an idle?

Reply Subscribe

Thread Tools

Search this Thread

Nov 5, 2013 | 08:45 AM

4CamT/A

Thread Starter

Launching!

iTrader: (21)

Joined: Jul 2010

Posts: 253

Likes: 7

From: california

Is this to Lean of an idle?

Hey guess been loosing some sleep over night about this. My car idles at 15-16.8 air/fuel ratio through my wide band also my vacuum is @15inches of vacuum. I notice this after I replaced #7 piston during cruising the A/F is at 14.6-15.2 the cam on the engine is (Int. 226 Exh. 240 lift is Int. 605 Exh. 589 lobe sep 115+5) the car runs fine but I'm a lil worried about the vacuum reading a to low any input is appreciated thanks!!

Nov 5, 2013 | 10:04 AM

Wicked69

TECH Fanatic

Joined: Oct 2011

Posts: 1,425

Likes: 0

Quote:

Originally Posted by LosLs1's

I am just going to give u my experience. If I set my idle anything leaner than 14 it likes to surge. I run mine just under. Cruising I run it around 14 also. My cruising has some issues in low rpm such as 15-1800 but other than that cruises nice. I'm still prettt new to this but thought I would share my experience. I also run E85 but use a gas scale.

Nov 5, 2013 | 10:08 AM

9sectruck

TECH Fanatic

iTrader: (9)

Joined: Dec 2008

Posts: 1,173

Likes: 2

From: jefferson city MO

MY car idles around 15.2-15.5 and cruises around 15.5/16.0
on e85 stock 5.3, and it gets 15.8pg hwy

Nov 5, 2013 | 10:18 AM

4CamT/A

Thread Starter

Launching!

iTrader: (21)

Joined: Jul 2010

Posts: 253

Likes: 7

From: california

I'm running pump 91 with meth I'm just worried if something else is damaged on the engine since it reads 15 inches of vacuum at idle then you give it some throttle and it picks up to 20 inches of vacuum n drops again when you let off the throttle @ idle I checked for leaks and didn't find any

Nov 5, 2013 | 10:37 AM

edwardzracing

TECH Enthusiast

iTrader: (59)

Joined: Jan 2007

Posts: 549

Likes: 0

From: Layton, UT

Quote:

Originally Posted by LosLs1's

Why do you think that is a problem? I don't see an issue with your amount of vacuum. That number is to be expected for the camshaft of your size and LSA. Does the car idle higher than normal? Is it surging? Leaner than stoich (roughly 15-16 AFR) would be what I'd tune for with that camshaft.

Nov 5, 2013 | 10:58 AM

4CamT/A

Thread Starter

Launching!

iTrader: (21)

Joined: Jul 2010

Posts: 253

Likes: 7

From: california

Quote:

Originally Posted by edwardzracing

the car idles fine no surging what's so ever . I was just lil worried since i broke #7 ring land I damaged other cylinders but I checked them and they where good. Did a compression test and all of them are great I haven't done a leak down yet but I just didn't remember the car doing that. Since I don't drive the car a lot.