Could you have picked up a load of dirty fuel? How long since your last fuel filter change?
Add all of the fuel problem questions you can think of.;)
Cheers
Simon
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Could you have picked up a load of dirty fuel? How long since your last fuel filter change?
Add all of the fuel problem questions you can think of.;)
Cheers
Simon
Tried this today: hi range error @ 2500 rpm, lo range @ 4000 rpm (approx). looks like it is the TPS, then?Quote:
Originally Posted by Blknight.aus
One questions, though: it does the same also when I engage cruise control. Does CC use the TPS to regulate car speed? Sounds a bit silly to me, but then again I am not car designer ...
Georgie
Mine did it yesterday after a Friday night of wading average 2 foot of floodwater whilst getting home, one puddle took me by surprise and had a big splash. Today I checked the air filter, and immediately bought a new one. I was complete, but slightly soggy on one corner and torn. Yes the rest of the airbox was dry. My car had only travelled 200km's since the big splash.
Car had only done this once and hasn't done it since. May be a co-incidence.
I would also make sure that the wastegate is not stuck closed, this will cause an overboost condition and momentarily the ECU will shut off fuelling to avoid engine damage. Just get a pair of multigrips and see if you can move the wastegate actuator rod away from the actuator, extending it against the internal spring pressure. It is quite difficult but it should move smoothly . If it is sticking, soak the shaft where it goes into the manifold housing with CRC or similar and move it manually for a while to free it up.
This also fits with the high and low range check, as the engine will not work hard enough in low range until high RPM to cause enough boost for the wastegate to try and open. You will never get a wastegate to open on a diesel engine without load applied, IE driving up a hill or driven hard.
This is not uncommon and will cause bad surging and sometimes a very quick miss, like a petrol engine having its coil lead momentarily disconnected.
JC
thanks, justinc, will try to have a look.
i will need to consult the RAVE disk first to see which part you mean. :)
georgie
OOPS, sorry. The wastegate actuator sits on top of the turbocharger housing, in front of the heat shield and has a rod coming out of one end with an adjustable ferrule in the middle of it. This rod goes partially under the exhaust heat shield where it is attached to the wastegate flap controlling 'lug'. The actuator has a small 3.5mm rubber hose going to it, and this is the pressure hose that forces the actuator rod out under boost and the rod opens the wastegate, bleeding off excessive boost.
I should also mention at this point that Disco's have a wastegate duty cycle controller switch, and this is bolted to the side of the A/C compressor and controls the bleed of pressure through this little hose to the actuator via signals from the ECU. These can sometimes fail, but the symptoms can be far more annoying, IE NO ability to accelerate at all, 'limp mode' Check engine lamp and poor starting etc.
Hope this is of some use G
JC
justinc,
staring is excellent, acceleration is there (up to the point where the stupid on-off thing occurs), so i hope the situation is not that bad an can be remedied with a bit of wd 40 ... or a new TPS at the worst.
again thanks for your help.
georgie
Just as an aside, IF you had access to a diagnostic tool, like RCL or testbook etc, a Throttle pedal potentiometer fault will show up as a 'driver demand circuit 'error, whereas a sticking wastegate can sometimes display an 'overboost condition'. This will mostly be a 'soft' or intermittent code.
JC
nope, no way.
however: is testbook a purpose-built tool, or simply a piece of software on a standard notebook? in that case, where do i get the software from?
georgie
Simon,Quote:
Originally Posted by abaddonxi
no idea when the fuel filter was last changed, I just owned the care for approx 500 km. Is there not a warning light for fuel filter replacement?
Called the mech, he said that it could be a fuel problem, i.e. in line with your suggestion. Maybe it is a good idea to change the fule filter just in case. However, the mech said about putting it on the dyno & hooking it up to all sorts of analysis tools, which sounds to me like big bucks before the problem is even fixed. Would like to avoid that.
How can I check the TPS? Should I just check for a loose connection? Plug / unplug?
Georgie