LC 105 motor running rich.

Submitted: Wednesday, Oct 07, 2020 at 17:19
ThreadID: 140599 Views:821 Replies:4 FollowUps:9
Hey guys ive got a 105 4.5ltr its running rich ive seen on an older thread sumone put a different type of air sensor in but not sure how they did it. They said on the thread that they swapped out the ohm for a different size and it worked. If anyone has sum info id love to hear back
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Reply By: HKB Electronics - Wednesday, Oct 07, 2020 at 17:41

Wednesday, Oct 07, 2020 at 17:41
Have you tried cleaning the mass airflow sensor?

Is the air cleaner element clean?

Had the injectors checked?
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Follow Up By: ben p1 - Wednesday, Oct 07, 2020 at 18:25

Wednesday, Oct 07, 2020 at 18:25
Had new air filter and new sensor put in and had injectors for serviced
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Reply By: RMD - Wednesday, Oct 07, 2020 at 20:05

Wednesday, Oct 07, 2020 at 20:05
Possibly a leaking hose in the intake system leaking air into the manifold in addition to metered airflow. The oxy sensor in the exhaust will see the additional oxygen and richen the mixture because it thinks it is running lean. An exhaust leak of air into manifold can also do that. Yes, as HKB said. Is the airflow sensor clean? Is the MAP sensor hose in good order? If cracked and allowing air in, the system will not be getting the correct ECU reading. If the fuel pressure regulator hose is cracked allowing air into the hose the fuel pressure the injectors will deliver the wrong amount of fuel.

PS. Just curious if the "sumone " is a mathematician?
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Follow Up By: ben p1 - Thursday, Oct 08, 2020 at 21:26

Thursday, Oct 08, 2020 at 21:26
Hey yeah ive checked everything and ive replaced what needed to be done. The mod i saw was on this forum from a few years back not sure who it was that did it. My cruiser dont have an oxygen sensor on the exhaust as it has no cat
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Follow Up By: RMD - Friday, Oct 09, 2020 at 07:42

Friday, Oct 09, 2020 at 07:42
A petrol engine not having a cat doesn't mean it doesn't have an oxy sensor. An oxy sensor keeps the mixture more correct than the airflow sensor can. It sounds like someone has bastardized your system. You say you have checked everything? Really. You would be amazed at things normal mechanics miss. Just trying to change components is one way ti fix it. Just means everything is replaced until it work well. Have a decent check of items people mention.
If mechanics have done work on the vehicle for this reason and you have checked "everything" , either they didn't find the fault and your checking everything is deficient, otherwise the problem would be solved. If you have the capability and understanding of the vehicle systems then you wouldn't need to ask.
Replacing an airflow meter may may be just a stab in the dark.
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Follow Up By: ben p1 - Friday, Oct 09, 2020 at 20:56

Friday, Oct 09, 2020 at 20:56
Seriously dude wats your problem i do all work myself and yes ive gone thru everything on my car and replaced anything that looked like it needec replacing. Ive askedon here to see if anyone had same problem . The car hasnt been bastardized its never had a oxygen sensor even my other 105 didnt have one. Ive checked everything again so if your going to just have a go at me then dont bother messaging back. Its guys like u that alot of people wont ask for help as they get told off by people like u. And yes i know wat im doing as ive built alot of cars and motors myself. Plz dont msg my post again as i dont need to hear from you again.
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Follow Up By: RMD - Saturday, Oct 10, 2020 at 10:19

Saturday, Oct 10, 2020 at 10:19
I see the limit of tolerance or understanding has been reached. If you have done "everything" to the vehicle and have the skills, then please tell me why it is running rich and you haven't found out why. You MUST realize, I and others are remotely providing replies based on what information is provided by YOU or can be gleaned from what you mention. Just saying everything has been done, means to me there cannot be any problem anymore. Just REPLACING stuff may fix the issue, but it appears the ability to diagnose anything is missing. Sorry can't assist further.
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Follow Up By: ben p1 - Saturday, Oct 10, 2020 at 11:49

Saturday, Oct 10, 2020 at 11:49
Yeah no worries. Ive ended up solving my problem anyways.
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Follow Up By: Genny - Monday, Oct 12, 2020 at 10:59

Monday, Oct 12, 2020 at 10:59
As a nosy bystander, what was the cause?
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Follow Up By: ben p1 - Monday, Oct 12, 2020 at 11:47

Monday, Oct 12, 2020 at 11:47
One of the new fuel injectors that was installed was faulty causing it to run rich.
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Follow Up By: RMD - Monday, Oct 12, 2020 at 11:47

Monday, Oct 12, 2020 at 11:47
This post has been read by the moderation team and has been moderated due to a breach of The Inappropriate Rule .

Forum Moderation Team
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Reply By: Member - McLaren3030 - Thursday, Oct 08, 2020 at 08:00

Thursday, Oct 08, 2020 at 08:00
Hi Ben p1,

Have a look at the Landcruiser Owners On Line (LCOOL) forum. It is a Landcruiser specific forum. There are some very knowledgeable people on that forum. Not to say that there aren’t knowledgeable people on this forum, just that LCOOL is Landcruiser specific.

Macca.
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Reply By: Member - DOZER - Monday, Oct 12, 2020 at 08:53

Monday, Oct 12, 2020 at 08:53
the 105 uses a map sensor, if you changed it, make sure the hose is connected to the manifold, or it will run rich
b4 you bag me out, walk a mile in my shoes, then your a mile away and have my shoes :)

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