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Running lean; Exhaust temperature sensor MD116829?


Ali_6306
Junior Member


Galant VR-4 org Post #: 1231642 posted 09/09/16 04:48 AM     Remind Me!  Send Private Message   Edit Post      
I have a 4G63 DOHC NA setup from 1988 JDM donor (SRGM2). The donor didn't come with exhaust high temperature sensor. Thanks to the forum members, I added a resistance (0.14 ohms) to address the instrument panel warning light. It is also relevant to mention that the setup has a single wire Oxygen sensor.

My car is running very lean so I introduced adjustable FPR. I reach the stoichiometric level if I set FPR around 58 psi. Which I believe is very high. So I suspect exhaust temperature sensor may be involved in setting AFR as the resistance is currently set at a constant, regardless.

Can someone suggest if this sensor is relevant at all to AFR. If so or not sure, does anyone know a replacement part for MD116829?

Looking forward!

Posts: 27 | From: Lahore, Pakistan | Member Since: 08/15/11 | IP: (119.160.65.152) | Report this post to a Moderator

tektic
Senior Member


Galant VR-4 org Post #: 1232195 posted 10/01/16 09:15 AM     Remind Me!  Send Private Message   Edit Post      
None of that stuff ever shipped to the USA. Try over at the dsmecu.com forum. Many international members there.

Is that ecu matched with that harness and engine? If it's that far off I would assume not.

Posts: 1494 | From: ronkonkoma, ny | Member Since: 12/19/12 | IP: (2607:fb90:1f06:e) | Report this post to a Moderator

bigandbad
Junior Member


Galant VR-4 org Post #: 1232201 posted 10/01/16 01:25 PM     Remind Me!  Send Private Message   Edit Post      
This is a very rare part... It was only used in the 1800 EFI. The model code was E35, and I don't where it was sold - but not in Europe.
You may try it at Amayama in Japan, that still have a lot of NOS parts in stock...
At At MM EU it isn't even listed...

Posts: 45 | From: Hamburg, Germany | Member Since: 09/06/16 | IP: (84.58.242.245) | Report this post to a Moderator

Ali_6306
Junior Member


Galant VR-4 org Post #: 1232446 posted 10/12/16 01:24 PM     Remind Me!  Send Private Message   Edit Post      
Hello Tektic, you are right this may never have been shipped to USA. Although I've seen EGR temperature sensor in wiring diagrams for California versions. Although I am not sure if this is the same sensor. ECU and harness match as they were plugged out from a half cut from Japan. Verified from a wiring diagram as well. But I will try dsmecu.com. as suggested.

Hello bigandbad, thanks for confirming EU source. I am followup with Amayama.

Great that you responded. I had lost all hope - Cheers!

Regards,

Posts: 27 | From: Lahore, Pakistan | Member Since: 08/15/11 | IP: (103.255.4.3) | Report this post to a Moderator

tektic
Senior Member


Galant VR-4 org Post #: 1232448 posted 10/12/16 01:40 PM     Remind Me!  Send Private Message   Edit Post      
The egr temp sensor is different. Not compatible in function.

Posts: 1494 | From: ronkonkoma, ny | Member Since: 12/19/12 | IP: (47.20.56.49) | Report this post to a Moderator

slugsgomoo
god hates stupid people
461/1000


Galant VR-4 org Post #: 1232474 posted 10/13/16 09:13 PM     Remind Me!  Send Private Message   Edit Post      
I don't like exhaust temp unless you're also logging AFR and knock, because without those it's pretty useless. You can be wicked rich and have ridiculous EGT's just by having retarded timing. It's useful, but not by itself IMO.



-andrew
{witty signature}
#461 Kensington Grey - 2.0L/T67/etc
2015 Triumph Tiger 800 XCx
2014 Ford Focus ST

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misterfixit
Victory Runner


Galant VR-4 org Post #: 1233537 posted 11/17/16 06:51 AM     Remind Me!  Send Private Message   Edit Post      
Hi Ali,

This is the thread where we fixed the sensor initially.
click
How are you getting on with it?

Rich



92 UK 1800 GALANT DD
88 JDM E39A GALANT VR-4, running. But only just.
93 CB4A --- rewound
91 PDM GTI Resurection project. Aborted
Stuff Index


Edited by misterfixit (11/17/16 03:49 PM)

Posts: 1553 | From: Midlands, UK | Member Since: 08/04/04 | IP: (195.33.118.208) | Report this post to a Moderator

Ali_6306
Junior Member


Galant VR-4 org Post #: 1234054 posted 12/08/16 01:42 AM     Remind Me!  Send Private Message   Edit Post      
Hello Rich! Great to hear from you. Been a while; hope you are well.

We fixed the light, but not the sensor. Used a variable and set resistance to 0.15 ohms.

Issue here is running lean. I am suspecting that this static 0.15 ohm resistance may be preventing ECM from setting appropriate AFR. Tried Amayama, Autopartmaster and many other sites, but none have MD116829 available.

Now considering a universal EGT. However, they come in different types. Would you know what type MD116829 is? I believe it is Resistance Temperature type with Negative Temperature Coefficient (NTC).

Regards, AP

Posts: 27 | From: Lahore, Pakistan | Member Since: 08/15/11 | IP: (119.160.81.1) | Report this post to a Moderator

kumfasa
Member


Galant VR-4 org Post #: 1234110 posted 12/09/16 10:10 PM     Remind Me!  Send Private Message   Edit Post      
Is this the sensor that goes into the exhaust just after the catalytic converter?
I have a JDM VR4 and there is a temp sensor in this position in the exhaust, but it is purely to alert to an over-temp cat. It is not used in the fueling calculations at all.



Even the wool your trying to pull over my eyes is 95% polyester.

Posts: 125 | From: Tauranga, New Zealand | Member Since: 02/28/15 | IP: (58.28.212.87) | Report this post to a Moderator

Ali_6306
Junior Member


Galant VR-4 org Post #: 1234141 posted 12/12/16 11:55 PM     Remind Me!  Send Private Message   Edit Post      
Its located around the same area. But since the donor half cut didn't have the sensor, I am not sure if it had a catalytic converter at all. Wondering if MMC connected it to ECM just to show a warning light

Anyways, I have ordered a wideband; expecting to get delivered by end of month. I intend to install it and then verify whether changing resistance (by variable) affects AFR at all.

Regards,
AP

Posts: 27 | From: Lahore, Pakistan | Member Since: 08/15/11 | IP: (119.160.96.92) | Report this post to a Moderator

kumfasa
Member


Galant VR-4 org Post #: 1234142 posted 12/13/16 02:11 AM     Remind Me!  Send Private Message   Edit Post      
Yep, its purely for a warning light. If it were used for fueling purposes it would need to be much closer to the exhaust manifold/turbo outlet. In its stock position, which is after the Cat it would be far too slow to react to changes in combustion events.

I would look elsewhere for your lean condition. Vacuum leaks first.



Even the wool your trying to pull over my eyes is 95% polyester.

Posts: 125 | From: Tauranga, New Zealand | Member Since: 02/28/15 | IP: (58.28.212.87) | Report this post to a Moderator

tektic
Senior Member


Galant VR-4 org Post #: 1234221 posted 12/18/16 09:29 AM     Remind Me!  Send Private Message   Edit Post   
I find injector seals to leak air quite frequently.

Posts: 1494 | From: ronkonkoma, ny | Member Since: 12/19/12 | IP: (47.20.56.49) | Report this post to a Moderator


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