Transition SD to MAF, now weird startup phenom..

Reply Subscribe

Thread Tools

Search this Thread

Apr 16, 2008 | 06:38 AM

99whitews6

Thread Starter

TECH Resident

iTrader: (2)

Joined: Jul 2003

Posts: 907

Likes: 1

From: Minnesota

Transition SD to MAF, now weird startup phenom..

Setup in Sig. I have successfully made the transition from CLSD to MAF. To my surprise, in my opinion, the car actually warms up, idles, decels, and gear transitions much better than in SD mode. One new issue.

(All of this happens in less than 5 seconds) On statup, it catches in less than a second and jumps to around 800 RPM, then imediately falls on its face to around 300-400 RPMs and catches again, then stumbles its way back up to 1100 and is smooth as silk from that point on. (these RPMS are all estimates but you get the idea)

This has happened every time(~20) I have started the car since the MAF incorp.

I dont have a log right now but if no one understands what is happening with this description I will post a log.

Thanks!

Apr 16, 2008 | 07:33 AM

YellowToy/A

TECH Fanatic

iTrader: (1)

Joined: May 2004

Posts: 1,016

Likes: 0

From: Northern WV just south of MD

Do you have a wide band?

Apr 16, 2008 | 08:10 AM

99whitews6

Thread Starter

TECH Resident

iTrader: (2)

Joined: Jul 2003

Posts: 907

Likes: 1

From: Minnesota

Quote:

Originally Posted by YellowToy/A

Do you have a wide band?

Yeah, it doesnt work though (LC-1)

Apr 16, 2008 | 08:19 AM

YellowToy/A

TECH Fanatic

iTrader: (1)

Joined: May 2004

Posts: 1,016

Likes: 0

From: Northern WV just south of MD

You need to know what the air/fuel ratio is the get it to work right. Sorry

Apr 16, 2008 | 08:25 AM

2002_Z28_Six_Speed

TECH Veteran

iTrader: (19)

Joined: Aug 2005

Posts: 4,538

Likes: 1

From: Wash, DC

You could try logging the idle trims by ECT and then adjusting those tables.

That would help.
But it seems anytime I make a tuning change I come up with different numbers.