Engine Mapping

Markd said:
It does sound as if the pump or its pressure regulator is suspect given the variety of failure conditions.
A free pump to use as a test of the theory doesn't sound too bad.
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I think it’s the only ‘big’ thing left to try as I’ve had a new fuel rail sensor and the fuel regulator so fingers crossed.
It won’t be fitted for a couple of weeks yet but I’ll post the results on here 👍🏼
 
Let's hope it does the trick.
I have a Passat estate that was heavily remappped when I bought it and I had it pulled back down to something much more civilised.
The tuner said at the time that the map was calling for conditions beyond safe working limits of some components - so glad I had it sorted.
It has PD engine so more limited options than with later Common Rail system.
 
Clarkey said:
Hi mark, it seems to go into limp mode when driving steady 60-65 ish.
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I think it's a fair assumption that the engine had enough power to drive at a steady 60-65 ish before it was remapped, which suggests that it isn't likely to be the remap causing the pump to do more work than its maker intended.
 
in h said:
I think it's a fair assumption that the engine had enough power to drive at a steady 60-65 ish before it was remapped, which suggests that it isn't likely to be the remap causing the pump to do more work than its maker intended.
Click to expand...
TBH re-mapping shouldn't make the engine any worse as all it's really doing is asking for a little more fuel mix when needed but I suppose it does possibly up the pressure slightly?

My T5 has been done for over 5 years now and still runs perfectly - extra grunt but no smoking etc. My X Trail the same - runs smooth as a bell with no smoke and that went from 173 to 221!
 
My freelander 2. Did the same. cruise ok But put a bit of pressure on the gas. Uphill or accelerate. And it went into limp mode. My friendly mech had a look. It has a Peugeot diesel 2.2 hdi engine. Same as my Moho That surprised me. . He changed the diesel filter. it was filthy. All goes great now. So poss dirty Fuel. filter
 
Even slightly dirty filters can cause a lot of issues. I now have mine changed every service for peace of mind - it's cheap enough so why not.
 
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