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Recent LPG Starvation Issue
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Administrator
Posted 4/9/2013 18:36 (#15659 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



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Location: An island off southern Tasmania.		the gasket for intake to plenum can leak at the rear cyliders, also be really careful to torque the bolts correctly...they strip so easily too.

there are two 12mm nuts for the plenum support, do them up last I found is best.

if you change all the precats with o2 sensors that would be elimination of that me thinks.

is your LPG line filter blocked?


You're not using a KN filter are you?


try another MAF sensor?
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Telpat16
Posted 4/9/2013 18:41 (#15661 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



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Posts: 108
1005
Location: NEWPORT QLD		Below some interesting waveforms:

Outlander is daughters new 7700k car - only one bank as has 4 cyl engine

I am somewhat surprised how much time the post cat sensor spends in the rich zone, but no CELs. This snapshot towards the end of a 45 min drive around Sydney, mostly not fast, so cat performance may improve when really hot under freeway etc conditions

Second pic is 380 after a long run on the freeway at 80 and then 100 kmh. This run produced the poor cat efficiency pending DTC for bank 2

Subsequent reading suggests modern ECU's rate cats by relative switch frequency between pre and post cat O2 sensors. Bank 2 has almost same switch freq, now that I have installed a working O2 sensor post cat.

I have the second hand cat to install when this one annoys me with CEL's - after I figure the lean idle problem!

"Frame 727" is the exact instant, about 10 mins after morning cold start in city traffic in 40 kmh streets, that I got both banks lean idle CELs,.

I can't see anything obvious other than it was after a short throttle off deceleration

I guess I need check all the vacuum etc connections to the inlet manifold



(Outlander.jpg)



(Freeway suspect Cat.jpg)



(Frame727_CEL On.jpg)



Attachments
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Attachments Outlander.jpg (407KB - 521 downloads)
Attachments Freeway suspect Cat.jpg (402KB - 574 downloads)
Attachments Frame727_CEL On.jpg (416KB - 530 downloads)
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Telpat16
Posted 4/9/2013 18:50 (#15662 - in reply to #15659)
Subject: Re: Recent LPG Starvation Issue



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Posts: 108
1005
Location: NEWPORT QLD

Administrator - 4/9/2013 18:36 the gasket for intake to plenum can leak at the rear cyliders, also be really careful to torque the bolts correctly...they strip so easily too. there are two 12mm nuts for the plenum support, do them up last I found is best. if you change all the precats with o2 sensors that would be elimination of that me thinks. is your LPG line filter blocked? You're not using a KN filter are you? try another MAF sensor?

 Inlet manifold was done by dealer at last service when injector O-rings replaced, so I assume correct torque etc

I replaced LPG filter at the beginning of the starvation issue that triggered this thread originally, and have no problem with lean except at idle

MAF sensor has been cleaned regularly with commercial MAF cleaning solvent

 

I DO HAVE KN filter  - but why would this cause lean idle? 

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Telpat16
Posted 4/9/2013 18:59 (#15663 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



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Posts: 108
1005
Location: NEWPORT QLD		Re Jigged graph to show MAF, not MAP - sensor appears quite sensitive - yellow line in top graph



(MAF Output.jpg)



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Attachments MAF Output.jpg (410KB - 578 downloads)
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Administrator
Posted 4/9/2013 19:08 (#15664 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



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Location: An island off southern Tasmania.		that rear bank post cat look wrong?
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Telpat16
Posted 4/9/2013 19:24 (#15665 - in reply to #15664)
Subject: Re: Recent LPG Starvation Issue



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Posts: 108
1005
Location: NEWPORT QLD

Administrator - 4/9/2013 19:08 that rear bank post cat look wrong?

I think it shows sensor working OK, but cat performance a bit suspect.  So far not bad enough to trigger a pending DTC for bank1




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Administrator
Posted 4/9/2013 21:04 (#15666 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



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Location: An island off southern Tasmania.		could be intermittent wiring issue...

have you tried logging at idle and wiggling plugs in real time?
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Telpat16
Posted 4/9/2013 22:09 (#15669 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



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Posts: 108
1005
Location: NEWPORT QLD		No. What about KN filter comment?
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Administrator
Posted 5/9/2013 13:47 (#15671 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



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Location: An island off southern Tasmania.		It stuffs up MAF sensors and destroys superchargers as it doesn't filter fine stuff.
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Telpat16
Posted 5/9/2013 17:18 (#15673 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



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Posts: 108
1005
Location: NEWPORT QLD		Tks

Just picked up a paper filter. Will do am tomorrow and again clean MAF sensor
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