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Old 17-08-17, 12:51 PM   #1
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Default 807 power loss

Hi, i need help on this one. I have 807 hdi 80kw. One month ago it have loss of power. I have put him on diag and there is no fault.

The car seems to go much better during colder weather (under 20c), during hot days it loose more power, on steep hills tend to cut it even more during driving.

On highway in 4th and 5th gear you can feel slight engine jerking, feels like little cut offs.

I have try to disconnect MAF and it goes even worse! Usually what i have read if you disconnect MAF it goes well.

Does somebody knows what is this all about?
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Old 17-08-17, 03:57 PM   #2
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Maybe change the fuel (& air) filters as a start. Always worth rinsing out the dpf if your 807 has one, at least you will see how blocked it is before running water through.
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Old 17-08-17, 03:58 PM   #3
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Disconnecting maf and it goes worse means maf is working

Check vacuum lines for leaks check wiring loom on engine for rot these are the 2 most common issues
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Old 17-08-17, 06:48 PM   #4
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Thank's for reply. I have put new air filter and thinking of replace fuel filter, although it is 6 month old. It does not have DPF.

Maybe vacuum lines are problem. So when it is cold outside lines shrink, so there is less leak?

Maybe it is ECU? How does bad ECU manifest?

Forgot to tell after 3000 rpm goes much better. I would say with normal power.

Last edited by dr.ante; 17-08-17 at 07:34 PM.
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Old 17-08-17, 07:50 PM   #5
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It is NEVER the ecu !!!!
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Old 18-08-17, 08:06 AM   #6
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Quote:
Originally Posted by reliable406 View Post
It is NEVER the ecu !!!!
At least some good news. Thank's
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Old 28-08-17, 06:47 AM   #7
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Hi all, here is little update. I have found swirl valve diaphragm with broken rod and vacuum leakage.
So i buy new one and still no progress.
Same symptoms remain.

Should i continue to search vacuum problems?
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Old 28-08-17, 08:47 AM   #8
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Have you actually measured the vacuum levels are you getting some ?
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Old 28-08-17, 09:25 AM   #9
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I do not know to do that, but i can see diaphragm rod moving up and down or stay in one position when i accelerate engine revs.
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Old 01-09-17, 05:17 PM   #10
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Ok,i have use my vacuum brake bleeding kit to test vacuum and it looks like vacuum is ok.

But i have found some pressure readings too low. My guess is that fuel pressure sensor or something like that is bad.
I have take screenshot. Can you tell more from this?
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dsc_1524_1504286278631.jpg  
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