Search | Statistics | User Listing Forums
Mitsubishi 380 Forum -Exclusively for owners of the Australian 380 PS41
Mitsubishi 380 Forum -Exclusively for owners of the Australian 380 PS41 ->  Technical info for the 380 -> LPG section -> View Thread

You are logged in as a guest. ( logon Only if you have registered by Email as per the instructions in the forum)

Recent LPG Starvation Issue
Jump to page : < 1 2 3 4 5 6 7 8 9 ... >
Now viewing page 4 [10 messages per page]		View previous thread :: View next thread
   Technical info for the 380 -> LPG sectionMessage format
 
Telpat16
Posted 23/8/2013 17:14 (#15528 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



Frequent flyer Gold

Posts: 108
1005
Location: NEWPORT QLD		Another CEL today - back to the drawing board

John

Have sent you an email with more info

Happy for u to post it if u think of value

Terry
Top of the page Bottom of the page
Administrator
Posted 23/8/2013 22:03 (#15529 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



Frequent flyer Gold

Posts: 1092
10005025555
Location: An island off southern Tasmania.		The green one doesn't look right Terry....swap it with the corresponding one on the other bank and see if the fault moves?

I would just change all 4 at once and have some spares....

diagnosis by substitution looks like the way...


but are all the connectors clicked in properly?
Top of the page Bottom of the page
Telpat16
Posted 24/8/2013 18:00 (#15530 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



Frequent flyer Gold

Posts: 108
1005
Location: NEWPORT QLD		Have done a bit more testing, reading and separating out graphs form front and back banks

http://www.picoauto.com/tutorials/cat-efficiency.html

provides a nice insight into what we should see pre and post cat converter

The graph below, compressed to view a lot more cycles shows speed, revs and temp at top

Then Rear bank pre and post cat, then front bank pre and post cat

As implied by the article linked above the cat smooths out the mixture variations by burring any remaining fuel

As can be seen by looking at middle graph post cat sensor activity seems to be associated with speed and rev variations - the exact time we would expect acceleration enrichment etc, so at worse is indicative of a partial fall off in cat efficiency, but have not had any P042? cat related DTCs

Bottom graph for front bank is a different story

At far left the post cat sensors seem to mirror behaviour of rear bank post cat then dies and sits at 0.18 volt without a murmur after engine temp went past 80 C

So back to dealer for a new post cat sensor - sadly pre and post have different shape connectors with electrical males and females swapped as well, so I cant easily recycle pre sensor without cutting and shutting the wires







(380_Sensor Graph.jpg)



Attachments
----------------
Attachments 380_Sensor Graph.jpg (112KB - 457 downloads)
Top of the page Bottom of the page
Telpat16
Posted 24/8/2013 18:19 (#15531 - in reply to #15529)
Subject: Re: Recent LPG Starvation Issue



Frequent flyer Gold

Posts: 108
1005
Location: NEWPORT QLD

Administrator - 23/8/2013 22:03 The green one doesn't look right Terry....swap it with the corresponding one on the other bank and see if the fault moves? I would just change all 4 at once and have some spares.... diagnosis by substitution looks like the way... but are all the connectors clicked in properly?

 

Connectors appear OK but I also cleaned them with contact cleaner, including disconnecting front post cat to generate a bank 2 fault - proves which bank my scanner assigns as 1 & 2

But also got a front primary sensor Circuit fault code so may have a funny connection on that one somewhere

I will email the screen capture of the graph to you - lot easier to read than the print & scan I copied

 

Top of the page Bottom of the page
Telpat16
Posted 24/8/2013 18:29 (#15532 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



Frequent flyer Gold

Posts: 108
1005
Location: NEWPORT QLD		Found a way to post the screen capture - much clearer than the no background graph in prior post





(380_Sensor Screen.jpg)



Attachments
----------------
Attachments 380_Sensor Screen.jpg (436KB - 474 downloads)
Top of the page Bottom of the page
Administrator
Posted 25/8/2013 10:27 (#15533 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



Frequent flyer Gold

Posts: 1092
10005025555
Location: An island off southern Tasmania.		the red and light blue square wave patterns are what they should all look like.


the light green one is a dead flat line....looks like a faulty sensor to me....if it was a blocked cat it would be running like crap....but to prove it take the cat off and shake it...i did have one that fell apart on the bench,...

all gaskets are reusable and takes about an hour to pull off...


if the cats are stuffed thenwack some rpw extractors on and an aftermarket cat at the rear....may as well...
Top of the page Bottom of the page
Telpat16
Posted 25/8/2013 12:13 (#15536 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



Frequent flyer Gold

Posts: 108
1005
Location: NEWPORT QLD		Extractors a nice thought, but have read elsewhere the cause CEL's too??

Any all turned to doodoo today on freeway - misfiring, flashing CEL.

Had the iPad so captured some log files for the dealer

Front bank primary (red graph) failed low and the post cat is quite dead as u noticed

Interestingly just before home I disconnected front primary so as to generate a missing sensor fault to confirm than on my app bank 2 is the front bank and the misfiring stopped

Disconnected log file graph shows the ECU 'sees' 1 volt hand is happy to run there - presumably open loop off the embedded maps - I will store that little gem of info if ever get misfire again!!

The failed primary sensor was new in March, so will be interesting to see how the dealer responds to a request for a free replacement.





(misfire_log.jpg)



(misfire log2.jpg)



Attachments
----------------
Attachments misfire_log.jpg (407KB - 460 downloads)
Attachments misfire log2.jpg (393KB - 454 downloads)
Top of the page Bottom of the page
Administrator
Posted 25/8/2013 20:17 (#15544 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



Frequent flyer Gold

Posts: 1092
10005025555
Location: An island off southern Tasmania.		Terry, if you have the cash, fir the extractors and a custom exhaust with rear cat.
You'll get CEL's but we have a fix for that as well.

Foozrcool has the mod for that.

CEL's are no big deal if the car runs properly.
Top of the page Bottom of the page
Telpat16
Posted 25/8/2013 20:31 (#15546 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



Frequent flyer Gold

Posts: 108
1005
Location: NEWPORT QLD		do you mean his foam blockout of the led?
Top of the page Bottom of the page
Telpat16
Posted 4/9/2013 18:12 (#15657 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



Frequent flyer Gold

Posts: 108
1005
Location: NEWPORT QLD		Got lucky at the wreckers - pair of 70K exhaust headers / cats with 4 O2 sensors for $400

Now have a enough sensors to test by substitution

Dealer agreed to refund fault 6 month old sensor

Have had one "marginal cat CEL" after changing post cat bank 2 faulty (flatlining) sensor

Bur still getting Lean idle bank 1 bank 2 CELs - maybe twice a day with a bit of around town running, and usually during slow down at throttle off

Injector seals have been changed

Are there any other known inlet manifold air leak locations ?

Will post some "normal" pre and post cat waveforms later after I extract from other computer - including a test in daughter's new 2013 Outlander which is still less than 8000 km
Top of the page Bottom of the page
Jump to page : < 1 2 3 4 5 6 7 8 9 ... >
Now viewing page 4 [10 messages per page]
Jump to forum :
Search this forum
Printer friendly version
E-mail a link to this thread

Registered to: www.380DB.com
(Delete all cookies set by this site)