scoota
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what would cause pig rich @ idle???
Hi guys, just after some input car was running fine , started missing and bogging down on the drive home.similar symptoms to a blown coupler.
wideband pegged 10:1 and wouldn't boost above 3 psi....
Thought this might have been a fuel pump issue, replaced with walbro and bored rail. No change
Car fires up and idles at 14.7:1 then gradually falls down to 10.
No codes are present.
Mods are
Gt28.76
Blitz boost controller
3in dp
KO 3in intake
Walbro and bored rail
W2A
Wideband
Aeromotive Fpr set @ 40psi
Stock Ecu and injectors
So far I have pressure tested the system to 15psi and sprayed soapy water around, all seems good.
Replaced all turbo joiners from the afm to the intake manifold.
Pulled the plugs and they are black as night, which I expected.
My initial thoughts are stuck injectors or faulty afm.
Other than that I'm stumped....
What are your thoughts?
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rock
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Re: what would cause pig rich @ idle???
2013/12/01 21:33:50
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whats your fuel pressure reading when a/f is 10
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scoota
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Re: what would cause pig rich @ idle???
2013/12/01 21:38:57
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kojab
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Re: what would cause pig rich @ idle???
2013/12/02 09:32:26
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You say "Car fires up and idles at 14.7:1 then gradually falls down to 10." I am assuming the engine is warm at this time.
How long does it run at 14.7 for?
Your richness could be caused by a malfunction of the oxygen sensor.
If your ECU is detecting a very lean signal from your O2 sensor it will add unwanted fuel.
You could try disconnecting the O2 sensor and see what it does. Just a shot in the dark.
92' SW20 3SGTE GEN2 GT Hardtop Holden Ls1 ECU 87' AW11 3SGTE Delco EFI ECU & 21 psi boost 71' KE25 3TGTE Delco EFI ECU Standard engine 24 psi boost 78' KE55 L67 Delco EFI ECU
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Mrskylighter
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Re: what would cause pig rich @ idle???
2013/12/02 09:48:56
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Yep thats a good idea with the O2 sensor. With it disconnected the ecu will use default values and may show the sensor to be the problem
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dylmrt
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Re: what would cause pig rich @ idle???
2013/12/02 13:55:32
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I had a similiar problem and was all good after the o2 sensor got replaced.
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track_mr2
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Re: what would cause pig rich @ idle???
2013/12/02 16:32:15
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I don't think its your O2 sensor. It only operates for closed loop but you are saying you can't boost above 3psi. Pull you spark plugs out and see if one is fouled or if all are fouled. I reckon you have an ignition related problem. Check the leads, plugs, coil and ignitor module first off. I had 3 leaking injector o-rings causing the car to run very rich but I was still able to hit full boost.
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scoota
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Re: what would cause pig rich @ idle???
2013/12/02 17:29:49
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Appreciate all the feedback guys, need to trouble shoot this...or put a match to it hahaha Kojab, it happens when I fire it up straight away, stays stoich for 10 secs then falls down to 10:1 don't want to warm it up as I don't want to wash the bores. It also spits out raw fuel and smoke to suit..... Surely a faulty o2 would throw a code though yeah?. Dylan, will def replace the o2 sensor and report back. Track mr2, all plugs are ridiculously fouled, but I Will replace injector o rings and see if that helps, also will have a poke around the ignition components.
post edited by scoota - 2013/12/02 17:53:59
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track_mr2
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Re: what would cause pig rich @ idle???
2013/12/03 08:20:54
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I don't think its your injector o-rings. Your engine would hydro lock on start up if your o-rings are gone. I reckon it is you ignitor module on the way out.
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scoota
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Re: what would cause pig rich @ idle???
2013/12/03 10:19:23
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ok, so after some investigationing this morning I have found this, looks to be part of my problem. This is only 8000 Ks old.
post edited by scoota - 2013/12/03 10:24:43
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Mrskylighter
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Re: what would cause pig rich @ idle???
2013/12/03 10:30:16
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Maybe I'm going blind but what is the problem with the dizzy cap?
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scoota
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Re: what would cause pig rich @ idle???
2013/12/03 11:11:08
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The horizontal contacts appear to be chewed out. Not much meat left on them. and thennn I found this.....
post edited by scoota - 2013/12/03 11:45:21
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Mrskylighter
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Re: what would cause pig rich @ idle???
2013/12/03 11:31:24
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That cap looks almost brand new to me. Nothing wrong with it.
I've changed one that had no posts left whatsoever. Flush with the plastic :)
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scoota
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Re: what would cause pig rich @ idle???
2013/12/03 11:51:58
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Oh well that's good to know, was unsure if they should have more meat than that. Cheers for the confirmation.. :)
I added some more pigs of the igniter module lead. As effed as it is, it was still producing a solid spark when I tested it...but will replace immediately..
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scoota
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Re: what would cause pig rich @ idle???
2013/12/03 14:58:41
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