Still no joy!! Fitted the sensor test drove soon as it comes under load engine note changes down in power and error 9150 comes up, turn or tractor and restart back full power. I found oil in the wiring loom from the injectors into the ecu but don’t think this is causing it because it’s not missing or anything. I’ve seen a few threads with the same problem but no one ever seems to say what fixes it. I took the tank out cleaned it no gauze or in line filter there, romeved the two filter housings cleaned them out a blew them down with an air line. I’m going to try another set of filters tomorrow just Incase. Anyone have any ideas??
mf 6490 error code 94 help
- Thread starter beaconsboy
- Start date
beaconsboy
Member
- Location
- south powys
We had to have a new wiring loom to the ecu cos there was oil coming down the wires. It stuffed the ecu on the end. It was also what caused funny error codes. I dont think you got a fuel problem. Im affraid you will have to get the dealer out
I rang the dealer and told him about the oil in the loom and he said it would cause it to miss if this was the case. But it definitely isn’t going to do any good I cleaned it all out with contact clearer but we bought the tractor secondhand last year with 8k hrs so god knows how long that oil was sitting there it could of made its way into the ecu. It did this one before when it was under warranty but the dealer couldn’t remember what he did to fix it. I wanted to just leave it into them so they could have a good look at it but was told it’ll be 2weeks before they could look at it!!
dee
Member
- Location
- Derry/Londonderry
Did you fit a new relief valve
dee
Member
- Location
- Derry/Londonderry
No the relief valve in the common rail
- Location
- Waikato
Had fuel line stuck behind tank or I be looking at pump especially if worse under load
Had the fuel line off did notice it was kinked were it’s secured to the tank but it’s not restricting the flow. If I had a way of checking fuel pressure i could fuel that pump out.
dee
Member
- Location
- Derry/Londonderry
Glad to be of help
Pheasant Surprise
Member
- Location
- Woodbridge, Suffolk
Maybe you missed it but @Glaws mentioned the same part and issue above (about 2 weeks ago). Anyway your sorted!Dee you legend!!!Took off the relief valve this morning and found a tiny wire stuck in the end of the valve it was rightly stuck in there took it out refitted and she’s back full bull. Thanks so much for your help.
Yeah I took off the regulator on the injector pump never realised there was a mechanical one on the end of the rail.
Back going 100% now hope it stays that wayDid anyone one ever come across this happening before, on my 6490 if I put on my full lights and only my full lights the front suspension will drop and my diesel gauge will stop working. If you disconnect the wiring loom under the bonnet for the lights it stops doing it. I did find oil in my injector wiring loom and in the ecu. Does anyone know if the main engine ecu control the front suspension?
dee
Member
- Location
- Derry/Londonderry
Check all the earth's especially the one that screws into the front of the cab. The front suspension has its own ecu
I have the 9150 code since I remember, its getting worse. Happens only in winter time, it used to happen below -20C but now it does it when warmer, +5C. It used to happen under load, but always after engine warms up. Had it to dealer and they scratch their heads. Looking at injectors again. Replaced fuel pressure sensor and relief valve... nothing. replaced injection pump... nothing. Replaced the control board with local farmer but nothing. Reprogrammed cpu, nothing. Let me say it again, happens only in winter. We think it could be sticky injectors, winter fuel is less lubricative. Not sure, I have been adding all sorts of fuel additives with no response. I wonder if maybe it has to do with temp sensors, why does it happen only in winter and when engine warms up? the engine de-rating is what is driving me nuts. Runs fine otherwise. I might try the fuel relief valve again and clean it, but we just replaced it with new one. Any other ideas?
It was exciting to read that it could be just the relief valve, even though I have had it replaced. But what could possibly contaminate the valve again? Unless something is wearing out with pressure pump. I will definitely look at it again, but I am no mechanic, do I need to worry about it being under pressure? or can I just loosen it up?
Also, how does that explain why it happens only when it is cold? I use this tractor every day, for feeding cows and cleaning manure. In the summer I use it also for cutting silage and hay, also I have used it to plow. No problems whatsover in the summer time, no error codes, no bad running of the engine.
As for the cpu, there is no oil leaking there. I had local farmer lend me the cpu from swather and swapped it to see if it was the board itself, the mechanic that did that did not see any oil in there either.
As I stated before, it is the derating of the engine that bothers me the most, since tractor runs fine before error code. In fact when its cold (-20) or lower, in derate mode, anything will stall the engine, it runs really poor because the computer is telling it to run bad. When I restart, it waits a few seconds before derating again, slowly bringing me back to 1500rpm and reducing HP. Is there a mod or something to get around this derating? I have looked at remapping and buying a chip to work around that, but I am not ready to spend money on that yet.
Thanks for getting back, but yeah about that relief valve, is the pressure there when tractor is off or is it only there when running?
Also, how does that explain why it happens only when it is cold? I use this tractor every day, for feeding cows and cleaning manure. In the summer I use it also for cutting silage and hay, also I have used it to plow. No problems whatsover in the summer time, no error codes, no bad running of the engine.
As for the cpu, there is no oil leaking there. I had local farmer lend me the cpu from swather and swapped it to see if it was the board itself, the mechanic that did that did not see any oil in there either.
As I stated before, it is the derating of the engine that bothers me the most, since tractor runs fine before error code. In fact when its cold (-20) or lower, in derate mode, anything will stall the engine, it runs really poor because the computer is telling it to run bad. When I restart, it waits a few seconds before derating again, slowly bringing me back to 1500rpm and reducing HP. Is there a mod or something to get around this derating? I have looked at remapping and buying a chip to work around that, but I am not ready to spend money on that yet.
Thanks for getting back, but yeah about that relief valve, is the pressure there when tractor is off or is it only there when running?
Glaws
Member
- Location
- Gloucestershire
Can you post a picture of the relief valve you’ve changed?
It’s the bolt head that sits in the end of the rail. Should be no pressure there with engine off but give it a couple of minutes to be safe.
Way to stop the derating is to fix the issue. At the moment it’s doing what it’s supposed to do.
Reason it’s doing it in the colder weather is down to tolerance. You only need that valve to have half a hairs width gap on the seat and it’s going to leak under high pressure.
In the summer there will be some expansion closing the leak.
Chances are there is another fragment stuck in that relief valve. Get it changed again.