Engine: D52447: Limp mode problem

[blackscience]

I have a problem with my 2003 plated XC90. My XC90 goes into limp mode when you accelerate quickly. My local garage has plugged it in and it started an issue with the boost valve the one located and attached to the air filter box. This was changed with a genuine Volvo part. The XC90 is still going into limp mode. The next to be replaced was the boost switch attached to the radiator, , again this didn't help and still goes into limp mode. The garage found that a pressure pipe from the rear engine mount was broken at the mount. They blanked the end of the pipe. The front engine mount was checked and the pipe was intact. All the pipes have been replaced by the garage. The XC90 still goes into limp mode.
Can anyone help with any ideas or advice please.

[john langrick]

Hi, you need to let the forum know what the code was that was generated when the car enters limp mode. It sounds like your garage should know and if you can let the forum know we may be able to help.

For example, when I had similar, I cannot quite remember the code but related to fuel pressure and a simple replacement of the full filter sorted the problem 100%.

You may well have had other problems that your. Garage has fixed, but can you update with current error code?

Hope this helps

John l

[blackscience]

Thanks for replying John. I will pop back to the garage tomorrow and obtain the code.

Neil

[gmonag]

This sounds more like an overboost issue. Can be caused by vacuum leaks (engine mounts/turbo actuator) or can be caused by sticky (coked up) turbo inlet guide vanes. An in-place turbo clean might help but the only real solution is to remove/clean/replace the turbo.

[AB-UK]

It does sound like the garage doesn't know what the real problem is, and is trying various fixes, replacing components one by one, presumably at your expense, until they hit upon the correct solution by chance.
Is it a Volvo dealership?

[XJSDriver]

I had similar problem with my Ford Galaxy which uses a variable vane turbo - this stuff (Forte Diesel Turbo Cleaner) fixed it; I poured 2 bottles into the tank and thrashed the car for 1/2 an hour and the sticking vanes disappeared!

I did not believe it would work. The first time this happened I paid £600 for a new turbo at 100,000 miles, so the 2nd time at 200,000 miles(!) either this worked or the car was off to the scrappie! Fortunately, it did the job (6000 miles now and all good) and so I have bought 2 more bottles and put one in the Galaxy and the other in the Volvo (preventative maintenance)

[blackscience]

The code is ECM8605 Engine requires service. It states Turbo Boost Control Valve.
The Garage is a local one I've used for the past 25yrs, trust them a lot. Because they couldn't fix there was no charge. Been to local Volvo Specialist and I wouldn't trust them as for as I could them.

[gmonag]

There is no ECM-8605 code. I think you have ECM-6805 Boost Pressure Control. Faulty Flow.

That code is the result of the issues I listed above. It does not have to be a faulty control valve. See:

https://www.volvoforums.org.uk/showt...hlight=ecm6805

[Shadeyman]

Originally Posted by blackscience

The code is ECM8605 Engine requires service. It states Turbo Boost Control Valve.
The Garage is a local one I've used for the past 25yrs, trust them a lot. Because they couldn't fix there was no charge. Been to local Volvo Specialist and I wouldn't trust them as for as I could them.

The Turbo Boost Control Valve controls the Turbo using a vacuum. You need to test all the vacuum pipes, make sure they're not leaking.

Check out this thread ..
https://www.volvoforums.org.uk/showt...ighlight=Boost