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Hi everyone. I've been battling a check engine light for a few months now and the dealership doesn't seem to get the grasp of it. My car is running rich. Replaced the mass airflow sensor, air filter, a leaking fuel injector, many ECU resets and a vacuum leak but the problem always comes back. My car has around 58K KM still on the factory spark plugs. Fuel economy is terrible in the city, slightly rough idle and a considerable loss of power on lower rpm. It stalled on me quite a few times on hard braking down to a stop. Any feedback is highly appreciated.

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Make sure that it can hold a vacuum - if the diaphragm is knackered, that's a potential unmetered air leak which would upset the mixture. If it holds itself open at idle, that's a reasonable indi

Item 8: https://www.deroure.com/partinfo.asp?MAK=0&MDL=0&TBL=0&SMA=1&SMO=20&ST=Actuator&SC=0&PBID=1089168  

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Mine also has been running for a while with P0172/P0175 codes. Also replaced all the same things you did, in addition to the pre-cat O2 sensors. Idle is fine, and I don't really notice a huge hit to fuel economy, so I haven't spent too much effort resolving it. I did take it in to my indie shop and had them update the ECU with the latest code, which resolved it temporarily, but it's come back after a few weeks. They did indicate that if the update didn't fix it, it's likely fuel pressure related (which was a bit out of spec). I went ahead and ordered both a replacement fuel rail (comes with the fuel pulse damper that you can't get separately for some reason) and the pressure regulator found at the fuel pump. Haven't had a chance yet to install either (and my next inspection isn't for another 2 years 😂), but will follow-up once I do if this resolves it. 

 

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17 hours ago, Elmagnoon said:

I've been battling a check engine light

Do you know what the codes are?

88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

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On 27/10/2020 at 15:14, Elmagnoon said:

Hi everyone. I've been battling a check engine light for a few months now and the dealership doesn't seem to get the grasp of it. My car is running rich. Replaced the mass airflow sensor, air filter, a leaking fuel injector, many ECU resets and a vacuum leak but the problem always comes back. My car has around 58K KM still on the factory spark plugs. Fuel economy is terrible in the city, slightly rough idle and a considerable loss of power on lower rpm. It stalled on me quite a few times on hard braking down to a stop. Any feedback is highly appreciated.

Very similar issues to mine!

Sounds strange but changing the clutch pedal sensor did make a bit of a difference for me.....

I'm changing the plugs next....

I'm on 64k miles.

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On 01/11/2020 at 06:54, Hangar 111 said:

Is it a supercharged car? If so check the function and integrity of the bypass actuator.

Dave

Sorry, just to clarify, are we talking about the supercharger bypass actuator? How did you check function of it please?

Thank you!

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On 02/11/2020 at 12:02, Reindeer said:

Sorry, just to clarify, are we talking about the supercharger bypass actuator? How did you check function of it please?

Thank you!

Make sure that it can hold a vacuum - if the diaphragm is knackered, that's a potential unmetered air leak which would upset the mixture.

If it holds itself open at idle, that's a reasonable indication, but there is a decent chunk of vacuum at idle.  If you can vacuum test it, that's a better test.

If bypass is not operating correctly at low rpm then you will be getting boost when you shouldn't.

Dave

Edited by Hangar 111
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Dave thanks for the explanation. 

Amateur question, just to clarify......if I apply a vacuum to the actuator.....I'm looking for it to stay open? And not slowly close? Is that correct?

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