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V50 engine strange fault/behaviour

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Old Jul 23rd, 2019, 23:39   #1
winther611
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Default V50 engine strange fault/behaviour

Greetings from Denmark.

Can I pick your brains and perhaps make good use of your vast experience.

I have a volvo v50 2.0 diesel from the year 2005.

It has covered 200.000 miles, and has been running fine, until last week, where I was driving around 60 mph, and all of a sudden I noticed a lack of power.

I managed to drive a couple of miles to find a good place to park, all while the engine was slowly deecelerating. When I shut of the car and turned it back on again, it would only idle. When I was trying to drive, it would cut out completely. I tried to disconnect the battery, hopefully forcing the ECM to reset, or at least go in to limp mode. No succes. I got the car towed to my workshop, where I coupled up my vida dice- clone. It showed NO fault codes. I then tried to disconnect the hose coming from the intercooler, at the throttle body. Then the engine would idle, but when I connected the hose again, it will choke. Likewise, if I disconnect the vacuum tube going from the TCV-valve to the turbo, the engine will idle, but once reconnected, the engine will cut off. That has led me to believe at faulty turbo, or TCV valve, but they both checked out good. I also tried changing the cranckshaft sensor, with no succes. Do you guys have any ideas, as to what is wrong with my beloved Volvo?

Sincerely,

Søren Winther
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Old Jul 24th, 2019, 19:29   #2
x DTR x
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Is the throttle flap fully open? I've had it a couple of times recently where it has stuck closed after the engine has been stopped briefly. If car has no dpf, try blanking the egr and unplugging it in case that's causing an issue?
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Old Jul 24th, 2019, 22:41   #3
winther611
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Hi, and thanks for the reply.

I all ready checked the throttle body, as I know, from reading this forum, they can cause problems. It is moving freely, and is not stuck.

The EGR- valve is moving freely as well, and is quite "clean".

And (luckily) my car has no DPF...
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Old Jul 25th, 2019, 23:06   #4
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Will it drive when you disconnect the vacuum pipe ?
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Old Jul 25th, 2019, 23:22   #5
winther611
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Hi.

No, it will only idle. And when i reconnect the vaccum hose, the engine dies...
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Old Aug 13th, 2019, 11:42   #6
winther611
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Solved.

It turned out to be the magnetic coil for the EGR- valve. I just can not understand why that did not trigger a fault code.

I have blanked the EGR off, and it now drives even better than before...
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Old Aug 13th, 2019, 19:28   #7
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Quote:
Originally Posted by winther611 View Post
Solved.

It turned out to be the magnetic coil for the EGR- valve. I just can not understand why that did not trigger a fault code.

I have blanked the EGR off, and it now drives even better than before...
You’ll find a slight improvement in MPG too... It’s breathing clean air now

TT
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