Slant *        6        Forum
Home Home Home
The Place to Go for Slant Six Info!
Click here to help support the Slant Six Forum upgrade!
It is currently Wed Aug 15, 2018 10:26 am

All times are UTC-07:00




Post new topic  Reply to topic  [ 37 posts ]  Go to page Previous 1 2 3
Author Message
 Post subject:
PostPosted: Mon Apr 18, 2016 5:38 am 
Offline
Turbo EFI

Joined: Wed Sep 17, 2008 6:48 pm
Posts: 2319
Location: Indianapolis
Car Model*:
Quote:
and misfiring


thanks, good tips,,
there area couple things I want to check today

1) pull the spark plugs, see if they look lean or rich
2) the bosch sensor for the AF is mounted near the exit of the collector on the long tube headers I am using. I have a set of header extensions, they were not installed for this initial start up, I'll install those today.
3) go back through the setting - trouble shoot tests on the IAC

after that it is on the required fuel -as suggested.


Top
   
 Post subject:
PostPosted: Tue Apr 19, 2016 5:03 am 
Offline
Turbo EFI

Joined: Wed Sep 17, 2008 6:48 pm
Posts: 2319
Location: Indianapolis
Car Model*:
photo of the spark plugs

https://www.flickr.com/photos/13718356@ ... ed-public/

the plugs were not new, but were clean prior to 10 to 15 minutes of engine run time,

and here is a video of a test I ran on the AEM and MS air/fuel ratio monitoring system.

https://www.youtube.com/watch?v=IS-Am_ZQliw

the two gauges do not display the exact same values, but both display very low scale numbers during very rich test conditions and very high scale numbers during very lean test conditions,, my conclusion is the AF monitoring is functioning.

I have reinstalled the header extensions that I had on the car previous to installing the FI, without the extensions present I believe there was enough reversion at the collector flange to make the AF sensor read lean.

Have the TB off the motor and the IAC unit out of the TB, I want to do some manual tests to verify that the IAC functioning correctly.


Top
   
 Post subject:
PostPosted: Tue Apr 19, 2016 8:13 am 
Offline
Board Sponsor & SL6 Racer
User avatar

Joined: Fri Nov 08, 2002 4:48 pm
Posts: 5864
Location: Burton BC canada
Car Model*:
I have had little luck with O2 sensors and open headers....an extension or longer exhaust and mufflers helped a lot.

There is a formula for exhaust extension which I have used in the past....but its location escapes me at the moment.

_________________
Yeah....Im the one who destroyed this rare, vintage automobile.....

Image


Top
   
 Post subject:
PostPosted: Tue Apr 19, 2016 8:28 am 
Online
Board Sponsor & Moderator
User avatar

Joined: Mon Oct 21, 2002 11:08 am
Posts: 12432
Location: Blacksburg, VA
Car Model*:
Yes, you definitely need a (non-leaking) exhaust with any O2 sensor to get accurate readings. 3-6 ft beyond the sensor location???

Lou

_________________
"You mean you still have a Slant 6 in that thing?"


Top
   
 Post subject:
PostPosted: Tue Apr 19, 2016 4:40 pm 
Offline
EFI Slant 6
User avatar

Joined: Wed Oct 01, 2003 11:40 pm
Posts: 439
Location: Etowah, NC
Car Model*: 1974 Plymouth Duster
Keep plugging away John! You'll get it figured out, I have faith in you! :mrgreen:

Brian

_________________
Flyin' Brian

74 Duster, 225, rear-mounted blow through turbo at 12psi boost, street/strip car
"Sixy Beast"


Top
   
 Post subject:
PostPosted: Wed Apr 20, 2016 4:04 pm 
Offline
Turbo EFI

Joined: Wed Sep 17, 2008 6:48 pm
Posts: 2319
Location: Indianapolis
Car Model*:
Appreciate the positive comment from all the slant six forum folks,,


Top
   
 Post subject:
PostPosted: Thu Apr 21, 2016 2:08 pm 
Offline
Turbo EFI

Joined: Wed Sep 17, 2008 6:48 pm
Posts: 2319
Location: Indianapolis
Car Model*:
put the header extensions on, they are about a foot in length,
that seems to be enough length to prevent air from reaching the bosch sensor except when off throttle

also changed the settings for the IAC valve,
I still need to do more with that, but the idle rpm is now in the 900 range with the motor hot, I'll let the motor cool down and do a start from 70 F spring weather tomorrow

https://www.youtube.com/watch?v=91iMHMzZeaY


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 37 posts ]  Go to page Previous 1 2 3

All times are UTC-07:00


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited