Help me with 427

[trophy427]

Well after a little holiday in 427. She decided to start to play up.

When stopping the engine revs would lift up on there own to around 2000 rpm.
When idle speed was Lower it was raising between 1000rpm and 1100rpm.

Other than this the trophy drives perfectly. It's only a problem when idling.

Has anyone come across this before?






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[dablk]

Sticky throttle body or air leak??

 

[hoolio]

Those two are a couple of options. What is the temperature gauge doing?

 

[trophy427]

Temperature is normal.


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[Badgerman85]

Sounds like exactly what mine did when the injector o-rings perished, may be worth whipping the rail off and checking all the injectors, they're dead cheap to replace as well, Euros sell the genuine Marelli ones for about £30!

 

[trophy427]

Well I took it to work and quickly read the codes. This is what's logged


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[trophy427]

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[trophy427]

Well today I removed my throttle body.

It wasn't too dirty but decided to give it a clean.

But it's still running the same.

I removed both sensor on the inlet manifold and gave them a wipe as well.

I removed the fuel rail guard and inspected the injectors there is no sign of leaks.

Bit stuck now on what to check next??


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[Carbon Chaos]

Do you have the acoustic valve disconnected, ie - a cold air feed to the air box ?

 

[trophy427]

I don't have a standard airbox but it been like that for 5 years now


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[trophy427]

Well trophy was still revving at 2000rpm. I checked and double checked for air leaks.
Read fault codes still no codes logged.

So I saw a old post on cliosport about the 1st lamda wires rubbing through.

So I checked the wires no sign of rubbing.
But I disconnect the sensor and started the engine. Engine now revving at 1100 rpm.

I'm amusing this would be a default mode as the sensor is disconnected?

So I'm suspecting the sensor has failed.


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[Mikeyjp]

this any good?

http://www.cliotrophy.co.uk/forum/showthread.php/50075-Constant-revving-on-idle-amp-whilst-driving

 

[hoolio]

So I checked the wires no sign of rubbing.
But I disconnect the sensor and started the engine. Engine now revving at 1100 rpm.

I'm amusing this would be a default mode as the sensor is disconnected?

So I'm suspecting the sensor has failed.


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I'm not sure if that points to the root of your problem.

 

[trophy427]

I'm not sure if that points to the root of your problem.

What would you test before I replace the sensor?


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[hoolio]

I thought that a lambda sensor fault would throw up an upstream oxygen sensor fault code. But they are cheap enough and you could always keep as spare/sell on.

 

[trophy427]

It had s upstream oxygen sensor code in it but was a historic code. It's funny how there no fault codes now but vehicle still faulting. I think I'm going to swap the sensors over first as there both the same


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[hoolio]

I read something the other day, can't find it now, that said swop out everything mentioned in the thread!!!! But also pay attention to wiring from ecu to TB. I'd also be checking wiring to missing acoustic valve and the vacuum arrangement from same.

 

[Carbon Chaos]

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I am pretty sure this fault code relates to the missing acoustic valve sensor,and as it usually gives no running problems is not your issue. A failed upstream or downstream o2 sensor will log a fault code for sure if your using good diag equipment and also bring on the EML light where as an air leak wont. just my opinion.

Just check the rubber pipe to the inlet from the acoustic valve is blocked off correctly still.