P0410 errors, air injection check valves already replaced

[Sharondippity]

My boyfriend is a mechanic for Mercedes, has worked on Porsches and every type of car out there, is now learning my car due to recent check engine light annoyances.

P0410 came up in December, I read the threads here, he checked the valves, one was fused closed, so he replaced those on both sides.

My car got hot yesterday driving home (idling for about 25 minutes in a nightmare traffic jam) and the light came on, same P0410 error code.

He wants to check the O2 sensors and do some elaborate testing.

I wonder what the next likely culprits are, to spare him some time.

 

[c4c5specialist]

Hi there,
Simple start the car ice cold.
Listen for a humming noise coming from the lower drivers side headlamp.
That is the injection pump working.
If you do NOT hear it, you may have a blown fuse or a bad motor.
Very easy to check.
Allthebest, c4c5

 

[Sharondippity]

Thanks, he plans on looking at it next weekend, I'll post results.

Meanwhile, it's still safe to drive, right?

 

[wishuwerehere82]

Is that the sound that sounds like a turbocharger spinning up when the engine is idling?
Usually when I'm pulling into the garage?

 

[Sharondippity]

My car keeps coming up with P0410 and is not able to pass smog due to this. I reset the check engine light and it keeps coming back on in a a day or two.

It's at the dealer, they have tested "everything" and cannot find anything wrong with it. Check valves replaced. O2 sensors check. Air pump checks fine.

Any hints or help will be appreciated.

 

[c4c5specialist]

HI there,
Have them disconnect the steel pipes going TO the exhaust manifolds.
Then, they can turn the air pump on and make sure there is air coming out of the tubes.
If there isnt, chances are very high that either the vacuum solenoid is NOT opening up or the tubes are rusted internally, not allowing air to pass.
Allthebest, c4c5

 

[Sharondippity]

Thanks, I go to pick it up today and I will show your post to them if the light comes on again.

 

[Sharondippity]

HI there,
Have them disconnect the steel pipes going TO the exhaust manifolds.
Then, they can turn the air pump on and make sure there is air coming out of the tubes.
If there isnt, chances are very high that either the vacuum solenoid is NOT opening up or the tubes are rusted internally, not allowing air to pass.
Allthebest, c4c5

Light came back on, and this time when I took it in they found that the solenoid was faulty.

You were correct.

 

[navy2kcoupe]

Sharondippity, thanks for posting the fix and closing out the thread. It sure is nice to be able to follow a problem all the way to the conclusion.
Andy

 

[Sharondippity]

I find it amazing that the corvette "specialist" had to take two looks at it to diagnose it correctly, while c4c5specialist diagnosed it correctly sight unseen.