I have a 205 XRDT which has given trouble-free service for years. Recently it started to lose power intermittently - it's just as though I took my foot off the accelerator, so it just ticks over. Then after a minute or so it's back to normal. Full power is available when required, unless there's none at all. I can feel the turbo coming in as usual. It might be ok for several days, or happen several times in ten minutes; either cold or hot. It always starts first time, even after standing for a couple of days, so it does not appear to be air leaking into the fuel line. No drips on the garage floor/on the engine, so it's not fuel leaking out. I can't find any particular circumstances when it happens - going uphill/downhill/round corners whatever.
I have:
- Drained the filter bowl & blown out the fuel feed & return lines - no problems.
- The manual primer pump on the filter works ok.
- There is no perceptible hiss on opening the fuel filler to indicate a blocked vent to the tank, and while blowing out the fuel line I can hear a hiss from the vent.
- It has been relatively warm recently, so it's not going waxy.
- Checked connections to the solenoid valve.
Any ideas, anyone? I'm stumped.
Dave