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MJK1
Newbie


Joined: 03 Nov 2018
Posts: 28
Location: Church Broughton, Derbyshire


PostPosted: Tue Sep 03, 2019 10:39 pm    Post subject: Reply with quote

Engine speed after cold start (O2 sensor swap)
 



Engine speed after cold start (sensor swap).png
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MJK1
Newbie


Joined: 03 Nov 2018
Posts: 28
Location: Church Broughton, Derbyshire


PostPosted: Tue Sep 03, 2019 10:41 pm    Post subject: Reply with quote

Upstream O2 sensor voltage after cold start (O2 sensor swap)
 



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MJK1
Newbie


Joined: 03 Nov 2018
Posts: 28
Location: Church Broughton, Derbyshire


PostPosted: Tue Sep 03, 2019 10:43 pm    Post subject: Reply with quote

Downstream O2 sensor voltage after cold start (O2 sensor swap)
 



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MJK1
Newbie


Joined: 03 Nov 2018
Posts: 28
Location: Church Broughton, Derbyshire


PostPosted: Tue Sep 03, 2019 10:44 pm    Post subject: Reply with quote

Air mass flow (MAF) after cold start (O2 sensor swap)
 



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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7161
Location: Brighton


PostPosted: Wed Sep 04, 2019 6:24 pm    Post subject: Reply with quote

This has as you said basically proved that its not the sensor as the same fault is there on bank 2 ...

Have a look at the cat .. if it's not the cat then i'm going back to the drawing board here Smile
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MJK1
Newbie


Joined: 03 Nov 2018
Posts: 28
Location: Church Broughton, Derbyshire


PostPosted: Sun Sep 08, 2019 4:19 pm    Post subject: Reply with quote

I think I may know what was causing the Bank 2 O2 sensor error codes (P0153 and P0154). The bank 2 sensors were plugged into the wrong connector!!!! They are colour coded black (upstream) and grey (downstream) but surprisingly not baulked so it's possible to plug the sensors in the wrong way around. It must have happened when I installed the engine and I didn't notice whenever I was changing sensors until today. The sensor voltages are now matching across the banks.

I'm still not convinced the secondary air is getting into the exhaust manifold as the voltage is high towards the end of the secondary air injection phase which indicates it's running rich as shown in the diagram below.

I'm going to run it for a while and see if any new codes are triggered.
 



Upstream O2 sensor voltage after cold start (B2 sensor correct connection).png
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Engine speed after cold start (B2 sensor correct connection).png
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7161
Location: Brighton


PostPosted: Sun Sep 08, 2019 5:42 pm    Post subject: Reply with quote

I think i can safely say i would never have gotten that fault in a million years without seeing the car !!

Clear the codes .. drive it for a while and see what fault codes you are then left with and we will take it from there .

Your last picture is a test picture of what should happen .. i suspect that's when you drivelink this system and graph the lambda sensor and not what you will actually see from a start up .


My guess anyways .
_________________
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My Daughter's Crowdfunding has hit the target see Here

Thank you all so Very much .

She's not going until july 2020 though .



Mechanic

7pm - 9pm

Now At An Indy.
 



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MJK1
Newbie


Joined: 03 Nov 2018
Posts: 28
Location: Church Broughton, Derbyshire


PostPosted: Sun Sep 08, 2019 8:06 pm    Post subject: Reply with quote

Thanks deMort, I've erased all the codes so will monitor it over the next few days and see if it springs any codes. Hopefully all the codes I was seeing were due to the upstream/downstream switch of the Bank 2 sensors.

I notice that once the engine has warmed up on a drive, when I come to a stop the secondary air pump starts up for about 10 seconds. I suspect this is the engine checking the secondary air system by looking for an O2 sensor voltage drop as the air is pumped into the exhaust manifold. I'm sure it will soon trigger an error code if it's not working.
 
  
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MJK1
Newbie


Joined: 03 Nov 2018
Posts: 28
Location: Church Broughton, Derbyshire


PostPosted: Fri Sep 13, 2019 3:23 pm    Post subject: Reply with quote

Well it looks like my car was suffering two separate problems. After a weeks driving the O2 sensor error codes haven’t come back but the secondary air system codes on both banks have. There’s no error message on the dash so it looks like that only gets triggered by the O2 sensor problem.

I’m now going to investigate the secondary air system using a hand vacuum pump, I suspect there is a leak or one of the valves isn’t working as I can hear the pump working.
 



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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7161
Location: Brighton


PostPosted: Fri Sep 13, 2019 6:12 pm    Post subject: Reply with quote

My guess would be ...

A leak between the pump and the check valve so there is not enough pressure to open it..

A faulty check valve ..

Both heads have carboned up thereby blocking the air getting into the exhaust .

The system is only there to fast warm the cats and as such has no impact on the running of the engine .. save the planet stuff so it's not something you would want to throw a lot of money at .
_________________
.

My Daughter's Crowdfunding has hit the target see Here

Thank you all so Very much .

She's not going until july 2020 though .



Mechanic

7pm - 9pm

Now At An Indy.
 
  
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MJK1
Newbie


Joined: 03 Nov 2018
Posts: 28
Location: Church Broughton, Derbyshire


PostPosted: Fri Sep 13, 2019 7:42 pm    Post subject: Reply with quote

Yes, I think I’ve certainly fixed the more significant of the 2 problems. The engine is running smoother since I corrected the O2 sensor connections and it’s giving an extra 2mpg and not triggering the engine warning light. However I would also like to fix the secondary air system.

The air ways in the heads were cleaned out when I was rebuilding the engine so I doubt the air is getting through to either head as both banks are always showing the error codes. I’ll try to locate a leak or faulty valve.
 
  
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