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 Post subject: pig rich
PostPosted: Thu May 19, 2016 12:24 am 
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Joined: Tue Jul 03, 2012 12:19 pm
Posts: 344
Location: vancouver island, canada
ok. 91 t3 75mm vitara pistons, ported head, intake and exhaust man. full rebuild, decked block and head everything. 275cc injectors running 15-20 lb boost depending on where i set my mbc. it was running great for a month then in the last week it started running absolutely pig rich. cruising at 80 km/h in 5th just touch the gas and my wb hits 10:1 (as low as it goes) and it completely bogs out like it had a Holley carb. even at wot first gear is good still running 10:1 but strong, hit second and complete bog. i have tried everything i can think of. thought maybe a dirty air filter restricting air, took it out and no change. tried a spare afm and no change. put the stock injectors in and it goes dead lean with that much boost. played with the spring on the afm and no change. its boosting perfectly with 0 leg, so i am at a complete loss and am hoping the experts might have an idea. and maybe a magasquirt they want to sell.

if anyone has any other ideas to try i would love to hear them.

_________________
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"


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 Post subject: Re: pig rich
PostPosted: Thu May 19, 2016 1:55 am 
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Joined: Thu Jul 01, 2004 3:52 am
Posts: 1540
Location: Vancouver, BC, Canada
I am not pro but have you checked the code? I think oxygen sensor could be the fault.

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 Post subject: Re: pig rich
PostPosted: Thu May 19, 2016 3:55 pm 
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Joined: Fri Dec 05, 2014 11:23 pm
Posts: 143
Location: SK
If you are using a wideband o2 with the simulated narrowband output, double check all the wiring. I had similar problems when I started modifying the injectors and air meter. After a few days my a/f ratios were way off, after re-soldering and heat shrinking was back to normal.


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 Post subject: Re: pig rich
PostPosted: Thu May 19, 2016 4:16 pm 
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Joined: Fri Dec 05, 2014 11:23 pm
Posts: 143
Location: SK
I also made a new dedicated ground for the wideband when I rewired the gauges/ 02 sensor. Before I had the boost gauge, wideband and stereo all grounded at the same point


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 Post subject: Re: pig rich
PostPosted: Thu May 19, 2016 4:44 pm 
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Joined: Tue Jul 03, 2012 12:19 pm
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Location: vancouver island, canada
It's a standalone autometer digital wide and. And it's reading correct as I car falls flat on its face when it goes rich. And yes. Codes are the first thing I check.

_________________
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"


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 Post subject: Re: pig rich
PostPosted: Thu May 19, 2016 10:15 pm 
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Joined: Thu Jul 01, 2004 3:52 am
Posts: 1540
Location: Vancouver, BC, Canada
if the oxygen sensor ( :huh: ) is good then what about fuel pressure in the rail? If it's good then test the MAF?

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 Post subject: Re: pig rich
PostPosted: Thu May 19, 2016 11:03 pm 
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Joined: Tue Jul 03, 2012 12:19 pm
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Location: vancouver island, canada
O2 is good. Fuel pressure is good. And tried 2 maf's. No change.

_________________
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"


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 Post subject: Re: pig rich
PostPosted: Thu May 19, 2016 11:38 pm 
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Joined: Tue Feb 13, 2007 10:28 pm
Posts: 1170
Location: So Cal, USA
On my MK1 T3 I tried 5 different injector sizes by trial and error using an AEM
standalone wideband analog AF meter. I prefer the analog because it's easier to
comprehend the needle sweep then to try to compute the rapidly changing digital
readout while piloting a heavy modified, torque steering, manual shifting rocket
on wheels.
One of the first mods was to wire the cold start injector to turn on with a pressure
switch. Not sure on the '91, but is it a possibility this is present on yours and
somehow coming on? It made mine fully rich, which is why I started trying
different injectors.
With header and K04 turbo set to run @15 psi, OE 210 injectors didn't work,
I tried 245, 275, 380 and finally used 320 to get best overall A/F ratio.
That said, I find it hard to believe you're getting so rich on 275 injectors.
My first thoughts are 1) cold start injector malfunction, though not likely,
don't think you have one but not sure 2) ECM malfunction..try clearing the
memory and see what happens, 3) Also makes me thing you might have
and injector malfunction.

So basically your put the stock injectors back in and it goes lean as expected,
put the 275's in and goes rich. I suspect injectors.


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 Post subject: Re: pig rich
PostPosted: Fri May 20, 2016 1:08 am 
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Joined: Thu Jul 01, 2004 3:52 am
Posts: 1540
Location: Vancouver, BC, Canada
Swap injectors could be helping but my last guess is ECU which is much easy to test.. ;p

PS. you can use cold injector mod on mk1 and mk2 turbo since they have one on the manifold....

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 Post subject: Re: pig rich
PostPosted: Fri May 20, 2016 7:40 am 
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Joined: Tue Feb 13, 2007 10:28 pm
Posts: 1170
Location: So Cal, USA
Yeah, basically you need to determine fuel trim.
Easy enough on modern cars, you pretty much only need an interface
and smart phone app. or a $100 harbor freight scanner.

You could use a scope to read and calculate the injector duty cycle,
that would tell you if it's the ECM. Of course you also want to check
the O2 sensor to see if it's functioning within parameters.

Since the injectors are batch fire, it could be as simple as having only
one bad one, maybe sticking open? You could pull the plugs and look
for an overly rich cylinder, though I'm guessing when you swapped in
the OE you probably mixed up the order when you put them back in?

So vacuum leak or other unmetered air? That's a possibility too, no?
You would go lean, then o2 compensates and creates rich condition.
Though a lot of that is out the window at WOT, at least on MK1 I
believe.


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 Post subject: Re: pig rich
PostPosted: Sat May 21, 2016 8:25 pm 
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Joined: Tue Jul 03, 2012 12:19 pm
Posts: 344
Location: vancouver island, canada
Found the problem. Even tho it was boosting normal and running normal VAC. There was a split in a hose. Didn't see it as it was under the mesh and the clamp.


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_________________
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"
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 Post subject: Re: pig rich
PostPosted: Sat May 21, 2016 9:17 pm 
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Joined: Thu Jul 01, 2004 3:52 am
Posts: 1540
Location: Vancouver, BC, Canada
Congrats you solved the mystery problem and drive it normally?

Good think, Jamal... I totally overlook the false air issue... really classic theory in the past. and much easy to check than test injector. ;]

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 Post subject: Re: pig rich
PostPosted: Sat May 21, 2016 9:21 pm 
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Joined: Tue Jul 03, 2012 12:19 pm
Posts: 344
Location: vancouver island, canada
Giving them all a squeeze they felt good. It was not until I pulled them all off and noticed somthing different and removed the webbing around it that I found it

_________________
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  
 
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