Hi all, I have a 1.8 tdci 90ps 07 plate connect. I have been getting intermittent MIL light, starting with cog light which cleared after I re started the van, now it's always the engine block symbol, and every time the code is always P141A, which I know is egr circuit intermittent.
I was reading a similar issue which "paul2012" posted some interesting answers, and as I haven't familiarised myself with the working of this engine yet, I was hoping for some advice / pointers as what to check and hat to replace.
My first thought was EGR valve has failed (I get a sluggish lacking power feeling quite often as though valve is sticking open slightly) However...... This is what I have done and fund so far:
Checked plug to EGR and wiring loom going back to main loom and can't find any defects / fault.
When turning the van off, the egr used to make a ticking noise for a couple of seconds, now I just get a high pitched wine/ oscillation type noise, but no movement sound from the valve.
I looked at the throttle valve (anti shudder valve) as was wondering if the sensor could be faulty...BUT. the valve moves freely if I operate the lever by hand, and the arm rests normally in the downwards position (is this normal?) On starting the van, the operator dosent move, on stopping the van, the operator dosent move Not sure if I should see it briefly close.
I pulled the vacuum hose off the operator bellows, and started the van..no suction. Stopped the van...still no suction..
Has my operator solenoid valve failed?? should I get something on this valve actuator when either stopping or starting?
Does the valve need suction to keep it open, and closes under Spring pressure, or the other way round? if it needs suction to close..how does it do that when switching engine off..just uses last engine rotations to generate enough vacuum to operate before engine stops altogether? I'm confused on how it should work, and or if mine is faulty in some way?
Also, if this valve isn't working would that explain my code and my egr not working properly?
So to sum up, is my EGR likely to have failed? If so can I check this somehow?
Is my anti shudder valve or its controls faulty in some way? or is it shut down because of the EGR?
Sorry for long post, just confused on how it should work
I much prefer my mk6 DI transit, much simpler systems and easier to diagnose lol
Andy