New owner; O2 sensor problem?
Thread Starter
Pit Crew
Joined: Dec 2016
Posts: 123
Likes: 37
From: Lourinhã
What if the MAF is failing?
It measures about 3.5 gr entering the engine at idle (approx 800 rpm) but the documentation says it should be 4.5 to 6.3 (from memory).
If the reading is wrong and there is actually more air entering the engine, it would show as lean leaving the engine, right?
It measures about 3.5 gr entering the engine at idle (approx 800 rpm) but the documentation says it should be 4.5 to 6.3 (from memory).
If the reading is wrong and there is actually more air entering the engine, it would show as lean leaving the engine, right?
CL Community Team
Joined: Sep 2009
Posts: 3,916
Likes: 227
From: Alabama
MAF should be relatively inexpensive to replace.
Perhaps you could find a parts store that will let you quickly install the new MAF and test, then return it if it does not correct the problem. It takes 2 minutes to swap in a new MAF sensor and installing it for 5 minutes to test does it no harm.
...also avail from Amazon in a couple of versions (here in US)
Perhaps you could find a parts store that will let you quickly install the new MAF and test, then return it if it does not correct the problem. It takes 2 minutes to swap in a new MAF sensor and installing it for 5 minutes to test does it no harm.
...also avail from Amazon in a couple of versions (here in US)
Last edited by Jabberwock; Apr 15, 2018 at 02:48 PM.
Pole Position
Joined: May 2016
Posts: 3,116
Likes: 659
From: AZ
This may seem like overkill to you, but I would go ahead and replace all your vacuum hoses. They get brittle with age and one will crack and cause a leak. You will fix that one, and the increased pressure will cause another on to crack. Your car is at the age where the hoses are all leaking, or will be leaking soon. Since you will have to do it eventually, why not do it now and see if it resolves your issue (Which I think it will)
If you buy the Lexus hoses your engine will look nice and new, but you can buy enough bulk hose to do your whole engine for less than $10
If you buy the Lexus hoses your engine will look nice and new, but you can buy enough bulk hose to do your whole engine for less than $10
Lexus Test Driver
Joined: Dec 2014
Posts: 8,213
Likes: 952
From: Fl
+1 on what Darryl said. Anytime I move a small vacuum hose on my 2002, it cracks. The crack could be out of sight, underneath.
i did what Darryl suggested and have extra hose to replace as I break them.
i did what Darryl suggested and have extra hose to replace as I break them.
Racer
Joined: Oct 2015
Posts: 1,810
Likes: 170
From: Colorado
Check the plug on the side . The valve on the back side, the last thing to check after all else is the intake gaskets.
Remove the entire circled and check thoroughly.
Anything here could be suspect. The tank circled should be checked throughly even if you have to remove to do so.
Any of these too. And you need to change that $8 pcv valve. You can't say it's good the spring inside could be weak or broken. Just because the valve moves when you shake it doesn't mean it's good.
Pole Position
Joined: May 2016
Posts: 3,116
Likes: 659
From: AZ
What I want to know is: what is the clamp that looks like duct tape on the left hand side of the picture. That is suspect also
Thread Starter
Pit Crew
Joined: Dec 2016
Posts: 123
Likes: 37
From: Lourinhã
Check the plug on the side . The valve on the back side, the last thing to check after all else is the intake gaskets.
Remove the entire circled and check thoroughly.
Anything here could be suspect. The tank circled should be checked throughly even if you have to remove to do so.
And you need to change that $8 pcv valve. You can't say it's good the spring inside could be weak or broken. Just because the valve moves when you shake it doesn't mean it's good.
I checked the PCV valve by blowing through from either end: from 1 side air would pass, other 1 not. Really hate renewing parts that are later found to be ok; MAF being case in point.
Some hoses seem to have been replaced recently (maybe by PO), but those are mainly the ones on top that are easily accessible.
Will report back soon.
Again many thanks all for the input.
Cheers,
Johan
Thread Starter
Pit Crew
Joined: Dec 2016
Posts: 123
Likes: 37
From: Lourinhã
Pole Position
Joined: Dec 2009
Posts: 3,135
Likes: 276
From: CA - San Diego
Thread Starter
Pit Crew
Joined: Dec 2016
Posts: 123
Likes: 37
From: Lourinhã
Progress!!
I've been driving the car without much problems (except CEL P0171/0174) and have replaced the injectors and sparkplugs which made the idle smoother.
In a constant search to find the vacuum leak I recently sprayed starter fluid underneath the inlet manifold.
SFT almost immediately went down.
So next step will be removing the inlet manifold and replacing the gaskets (all 3 of them).
I'm hoping this will get rid of the lean codes.
Cheers,
Johan
I've been driving the car without much problems (except CEL P0171/0174) and have replaced the injectors and sparkplugs which made the idle smoother.
In a constant search to find the vacuum leak I recently sprayed starter fluid underneath the inlet manifold.
SFT almost immediately went down.
So next step will be removing the inlet manifold and replacing the gaskets (all 3 of them).
I'm hoping this will get rid of the lean codes.
Cheers,
Johan
