TeamSwift

Home of the Suzuki mini-compacts ! Your Home for all things Suzuki Swift, Geo Metro, Holden Barina, Chevy Sprint, Pontiac Firefly, and Suzuki Cultus. TeamSwift is a technical performance oriented community!
It is currently Sat Oct 21, 2017 10:13 am

Underbody braces, turbos and more!

All times are UTC - 5 hours




Post new topic Reply to topic  [ 12 posts ] 
Author Message
 Post subject: dead lean on boost
PostPosted: Sun Sep 28, 2014 1:52 pm 
Offline
User avatar

Joined: Tue Jul 03, 2012 12:19 pm
Posts: 344
Location: vancouver island, canada
Well I get the red rocket up an running. Trying to dial in the afm but no matter what I do it goes dead lean on boost above 4000 rpm in all gears. Even if I get the afm to run at 11:1 on idle it still goes lean. I took out the air filter to eliminate that and am using an autometer wideband. Any idea on the experts on what next. It's a more or less stock 91 t3 with just a bit of porting of the head. Boost gauge tops at about 8.5-9 psi

_________________
92 geo metro 1.0L 5 spd. 2 dr Soon to be my turbo swap car. (Dragonfly) sold
91 pontiac firefly, 1.0L 2dr auto. stock. (The crap can) sold
91 chevy sprint. 1.0L 5 spd. My first turbo swap. (Red rocket) now the purple nurple
95 geo metro. 1.3L auto parts car. (Scrap)
91 chevy sprint turbo, blueboy keeping it "stock"


Top
 Profile  
 
 Post subject: Re: dead lean on boost
PostPosted: Wed Oct 01, 2014 10:53 am 
Offline
User avatar

Joined: Tue Jul 03, 2012 12:19 pm
Posts: 344
Location: vancouver island, canada
Nobody eh. I have already checked the hoses and obvious stuff. There are no vac leaks. And it idles right at 14.7:1 and runs normal until it gets over 5 psi boost

_________________
92 geo metro 1.0L 5 spd. 2 dr Soon to be my turbo swap car. (Dragonfly) sold
91 pontiac firefly, 1.0L 2dr auto. stock. (The crap can) sold
91 chevy sprint. 1.0L 5 spd. My first turbo swap. (Red rocket) now the purple nurple
95 geo metro. 1.3L auto parts car. (Scrap)
91 chevy sprint turbo, blueboy keeping it "stock"


Top
 Profile  
 
 Post subject: Re: dead lean on boost
PostPosted: Wed Oct 01, 2014 1:19 pm 
Offline

Joined: Thu Feb 22, 2007 10:51 pm
Posts: 153
Location: boise id
Is that a map sensor car or a vaf car?


Top
 Profile  
 
 Post subject: Re: dead lean on boost
PostPosted: Wed Oct 01, 2014 10:34 pm 
Offline
User avatar

Joined: Tue Jul 01, 2008 9:46 pm
Posts: 804
Location: Great Falls ,Mt.
""Dead lean on boost'' will mean dead pistons in a very short time. It doesn't take very many seconds of detonation to smoke a piston and possibly ruin the head and cylinder.


Ken..........


Top
 Profile  
 
 Post subject: Re: dead lean on boost
PostPosted: Wed Oct 01, 2014 11:03 pm 
Offline
User avatar

Joined: Tue Jul 03, 2012 12:19 pm
Posts: 344
Location: vancouver island, canada
I know it does not have a map sensor. So must be the other. But I have never heard of it.


That's why I'm glad I installed a wideband. When we see it go over 15:1 we let off the gas.

_________________
92 geo metro 1.0L 5 spd. 2 dr Soon to be my turbo swap car. (Dragonfly) sold
91 pontiac firefly, 1.0L 2dr auto. stock. (The crap can) sold
91 chevy sprint. 1.0L 5 spd. My first turbo swap. (Red rocket) now the purple nurple
95 geo metro. 1.3L auto parts car. (Scrap)
91 chevy sprint turbo, blueboy keeping it "stock"


Top
 Profile  
 
 Post subject: Re: dead lean on boost
PostPosted: Thu Oct 02, 2014 7:56 am 
Offline

Joined: Thu Feb 22, 2007 10:51 pm
Posts: 153
Location: boise id
It could very well be a bad vaf (air flow meter). My 87 was doing the same thing for a while right before the vaf died completely and would run lean all the time. The vaf should be in the air intake somewhere close to the air filter.


Top
 Profile  
 
 Post subject: Re: dead lean on boost
PostPosted: Thu Oct 02, 2014 10:48 am 
Offline
User avatar

Joined: Tue Jul 03, 2012 12:19 pm
Posts: 344
Location: vancouver island, canada
I was thinking that to. But I have 2 of them. And the one I'm using works better then the other one. But I might try the second one and play with technology settings a bit. It is running dead lean just on idle. But it can be adjusted. Wish I could change it to a hot wire Chevy style. That would make life so much easier.

_________________
92 geo metro 1.0L 5 spd. 2 dr Soon to be my turbo swap car. (Dragonfly) sold
91 pontiac firefly, 1.0L 2dr auto. stock. (The crap can) sold
91 chevy sprint. 1.0L 5 spd. My first turbo swap. (Red rocket) now the purple nurple
95 geo metro. 1.3L auto parts car. (Scrap)
91 chevy sprint turbo, blueboy keeping it "stock"


Top
 Profile  
 
 Post subject: Re: dead lean on boost
PostPosted: Thu Oct 02, 2014 10:01 pm 
Offline
User avatar

Joined: Tue Feb 13, 2007 10:28 pm
Posts: 1170
Location: So Cal, USA
Make sure the wiring connector is clean and making a tight secure connection.
Also make sure the flapper moves freely and is not sticking.
Good idea to check for codes. If any of the intake ducting clamps
are loose or hoses are cracked that can introduce unmetered air as
well and make a lean condition. Put up some pics of what you're working on.
Finally, you may want to bench test the unit against FSM specs before
making any adjustments.


Top
 Profile  
 
 Post subject: Re: dead lean on boost
PostPosted: Fri Oct 03, 2014 1:09 am 
Offline

Joined: Mon Apr 29, 2013 6:24 pm
Posts: 43
Location: renton, wa
Most likely the VAF (the door is getting stuck), i have this exact issue until the car warms up. I think there is a way to have the bearing replaced inside. Is your car getting up to temperature? Mine is not as extreme as yours, i wont hit full boost (on purpose) and only let the AFR get to 16-17 (red) before switch gears. It seems as soon as the car gets warmed up i can get into 10-12 AFR with no issues.


Top
 Profile  
 
 Post subject: Re: dead lean on boost
PostPosted: Fri Oct 03, 2014 11:41 am 
Offline
User avatar

Joined: Tue Jul 03, 2012 12:19 pm
Posts: 344
Location: vancouver island, canada
It does get up to temp. And quick. I know the door is not sticking because I can none it from closed to open no problem with no resistance. It runs better cold. Will hit full boost no problem running at about 13:1 it's once it warms up it causes the problems. But I'm back home tonight so I will try my other lid tomorrow. I also ordered a set of 275cc injectors. See what that does. But first we are going to pop the hood off and watch the fuel pressure gauge. Make sure that's not dropping. It has a higher flow/pressure pump but something else might be restrictions flow. Take a closer look at the fuel lines.

_________________
92 geo metro 1.0L 5 spd. 2 dr Soon to be my turbo swap car. (Dragonfly) sold
91 pontiac firefly, 1.0L 2dr auto. stock. (The crap can) sold
91 chevy sprint. 1.0L 5 spd. My first turbo swap. (Red rocket) now the purple nurple
95 geo metro. 1.3L auto parts car. (Scrap)
91 chevy sprint turbo, blueboy keeping it "stock"


Top
 Profile  
 
 Post subject: Re: dead lean on boost
PostPosted: Sat Oct 04, 2014 1:03 pm 
Offline
User avatar

Joined: Tue Jul 03, 2012 12:19 pm
Posts: 344
Location: vancouver island, canada
Well. Turns out the fuel pump we picked up was faulty. In the garage it ran perfect. But once on the road the pressure dropped like a rock. Installed new pump. Runs perfect now. Thank you everybody for all your help. Soon I will be starting the second swap so I hope it goes a lot better.

_________________
92 geo metro 1.0L 5 spd. 2 dr Soon to be my turbo swap car. (Dragonfly) sold
91 pontiac firefly, 1.0L 2dr auto. stock. (The crap can) sold
91 chevy sprint. 1.0L 5 spd. My first turbo swap. (Red rocket) now the purple nurple
95 geo metro. 1.3L auto parts car. (Scrap)
91 chevy sprint turbo, blueboy keeping it "stock"


Top
 Profile  
 
 Post subject: Re: dead lean on boost
PostPosted: Sat Oct 04, 2014 9:00 pm 
Offline

Joined: Thu Feb 22, 2007 10:51 pm
Posts: 153
Location: boise id
Glad ya got it figured out.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 12 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 5 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 Group