Engine loosing power

 
 
 
 
 
 
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Re: Engine loosing power

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Posted: 12.10.2019  ·  #41
No, I’ve read that wrong ....sorry.
MAF/MAP won’t cause a ‘cut out and stop’ .
Difficult one really, if it’s so infrequent and not manifesting itself regularly or causing an EML condition then it can be difficult to emulate and find. Be interesting to see the output from the rail sensor and if it’s between the tolerances. There is various sensors that will cause an engine shutdown should they get a momentary open circuit which is the most likely explanation.


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Engine loosing power

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Posted: 12.10.2019  ·  #42
As advised earlier I would be looking at the fuel supply, is there something pulling against the intake in the tank or the outlet port of the filter. is there a gauze filter on the intake pipe,


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Re: Engine loosing power

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Posted: 12.10.2019  ·  #43
I know not the answers to any of these questions. But on the fuel supply side, filter etc. would we expect the fuel to be completely shutoff intermittently, resulting in an engine stall? A partial blockage would be more likely to cause the engine to Labour would it?


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Re: Engine loosing power

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Posted: 12.10.2019  ·  #44
I know a guy in another Club that was plagued by his Motorhome staling, it is a fairly modern Pilote built on a sprinter chassis, he solved it by drilling a small hole in the fuel cap, what ever vent that is in the fuel tank to allow air to replace fuel as it is burned must be blocked. might be worth replacing the cap for a short while with something a bit of plastic held on with an elastic band and a small hole in the plastic, Jason.


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Re: Engine loosing power

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Posted: 12.10.2019  ·  #45
That’s interesting Pat. I had a similar issue with my water tank cap. It wasn’t venting. I knew there was a problem when I struggled really hard to open the cap as there was a partial vacuum in the tank. That couldn’t have been good for my Shurrflo pump.

I’all keep that in mind.


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Engine loosing power

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Posted: 12.10.2019  ·  #46
Quote by The Rambler

I know not the answers to any of these questions. But on the fuel supply side, filter etc. would we expect the fuel to be completely shutoff intermittently, resulting in an engine stall? A partial blockage would be more likely to cause the engine to Labour would it?


I had a situation a long number of years ago, where they painted the inside of the tank and after a while it started to lift off and curl into small strips which when driven hard or when the booth was out down, they would be sucked into the fuel line and stop the engine, when there was no more draw they just fell away allowing the engine to restart when it was turned over enough to bring fresh fuel to the carb. could leave you sitting in the outside lane, while trying to overtake.


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Re: Engine loosing power

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Posted: 12.10.2019  ·  #47
Quote by sprinter

Quote by The Rambler

I know not the answers to any of these questions. But on the fuel supply side, filter etc. would we expect the fuel to be completely shutoff intermittently, resulting in an engine stall? A partial blockage would be more likely to cause the engine to Labour would it?


I had a situation a long number of years ago, where they painted the inside of the tank and after a while it started to lift off and curl into small strips which when driven hard or when the booth was out down, they would be sucked into the fuel line and stop the engine, when there was no more draw they just fell away allowing the engine to restart when it was turned over enough to bring fresh fuel to the carb. could leave you sitting in the outside lane, while trying to overtake.


Had the same problem with a Morris Marina all of those years ago. Some Leyland tractors suffered the same problem with paint flakes getting into the fuel system too


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Re: Engine loosing power

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Posted: 12.10.2019  ·  #48
Quote by The Rambler

I know not the answers to any of these questions. But on the fuel supply side, filter etc. would we expect the fuel to be completely shutoff intermittently, resulting in an engine stall? A partial blockage would be more likely to cause the engine to Labour would it?


A heavily clogged filter can restrict fuel supply. If this is severe enough, the pressure in the fuel rail can in theory drop below its minimum operating range, it will be the engine management thats killing the engine to protect the high pressure pump, the engine management throws up a red STOP ENGINE light and the stored code is fuel rail pressure sensor out of range.

At rest, the crud in the fuel filter can fall to the bottom and hey presto you're good to go for another while.

This may or may not be the root cause but filters are cheap and if you don't know when it was last done, it's a no brainer to change it ASAP.


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Re: Engine loosing power

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Posted: 12.10.2019  ·  #49
I see what you’re saying BM. I’ll see if I can check it out when I get it back. Cheers!


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Re: Engine loosing power

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Posted: 24.07.2020  ·  #50
To all of you pointing to issues on the fuel supply side, it would appear your instincts are correct. I broke down cruising on the motorway yesterday. The same issue, a complete stall. This time I could not restart the engine so had to be towed to a garage in Galway. They looked at the fuel filter and found metal filings. They suggested I take it to a diesel injector/ pump specialist. Cleaning out the filter allowed it to restart and I could drive it to the diesel guy.

His prognosis is basically that the fuel line is very badly rusted and this is what is ending up in the fuel filter. So the line will need replacing, along with the pressure sensor that is about to fail, and possibly the injectors. What's also very worrying is the corrosion on the ECU housing. He said he would be frightened to even touch the housing for fear of it completely disintegrating, and for that reason alone you would not want to be driving anywhere until it is replaced.

I gave him the go ahead to carry out the work. It is now a race against the clock as we really want it ready for our planned staycation.


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Re: Engine loosing power

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Posted: 24.07.2020  ·  #51
I always change the diesel filter every time I do an oil change

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Re: Engine loosing power

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Posted: 24.07.2020  ·  #52
Quote by TommyS

I always change the diesel filter every time I do an oil change


Diesel filter every oil change is possibly excessive but as I said above, filters are cheap.

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Similar problem

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Posted: 24.07.2020  ·  #53
HI, we had a similar problem recently only just fixed, we have a 2006 Hobby on a Ford Transit cab and it turned out to be a sensor on the crank shaft overheating, seems to be a regular problem with old transits. Hope you get sorted.

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Re: Engine loosing power

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Posted: 24.07.2020  ·  #54
BM. Years ago my friend bought a Sierra and drove it 120k without changing the diesel filter, now that’s extreme

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Re: Engine loosing power

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Posted: 24.07.2020  ·  #55
I had a stalling issue on my Volvo S40 back in 2014 at 202k miles and took it to a main dealer who diagnosed a failing fuel pump, they found metal filings in the fuel line, and recommended a new pump and injector overhaul o.O . which was confusing as there was no lack of power when needed and apart from the stalling the engine ran perfectly at every throttle stage other than tick over.
A friend recommended a local Polish guy who said the presence of the filings were 'normal' for a milage of 202k and set about trying to sort the problem. After a few hours, he rang me to say the issue was a faulty fuel pressure sensor telling lies to the ECU, a second hand one for €70 was fitted .................. 52k miles later still running perfectly :D .


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