by didicoy » Thu Feb 16, 2017 9:47 pm
Advice needed. My 1995 mk5 banana 2.5 turbo Di has been a really reliable engine. It's been stood for many months. Until last week, when started normally. Left to run for five minutes. I noticed it was revving a little higher than usual. Hour or so later started engine and red (engine block) warning/attention light came on and stayed on. Engine had not power. Very slow and sluggish to rev, slowly building up revs but seemed flat and powerless. I drove it up the road and it would eventually build up speed but on pulling up. The red engine block light stayed on. Having checked in engine bay. I found nothing. Later I turned key and red engine light went out at same time as alternator light did. Throttle seemed to return to normal noise and engine response. Just like it had resumed to full power. However. It appears to be revving a little sporadic when idling. Ben revving high. I've run it for 5 miles and it appears to drive normally, turbo working etc. Just before I reached my destination. I felt the power reducing and the symptoms returned. Only crawling with limited response from engine. again I let it stand for half hour and tried engine again. It did start a little sluggish,light went out but the throttle did eventually respond . Parked it up over night and when tying to start engine next day. It Completely felt powerless again. Engine would slowly rev up, (again red engineblock warning light on) but obviously quieter and not responsive on the throttle. Having stopped and started it several times on the key. It fired up quite normal again. Raved up fine, red light went off and had all the power back through the turbo. I drove it a further 5 miles, ran fine. Possibly a little trembly on the eves at if speep I'll revs, a tiny bit juddery? I Stopped to get fuel. Engine revving sporadic during idle. Like it's revving it's self a little. If red engine block service light is on, no power, revs low and quiet, slow to build up revs. If red engine light off, sounds back to normal. Revs up responsive. Turbo sounds healthy. But it has a erratic idle rev. P and down like it's searching for fuel or air? I also think it's getting hot under the bonnet, more than I would expect, almost like its over revving while Im driving it or stationary. Can anybody one please point me in a direction of diagnosis? Your time and advice greatly appreciated.