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Discussion Starter #1
Had my GTV V6 (year 2000) for over 8 years now and it’s always been great. Ran on Shell V Power but then local Shell station changed to Esso so now use their premium unleaded with some Tesco Momentum. Last year started having fuel starvation/power loss at high revs. Was intermittent and sometimes would clear quickly, sometimes had to pull over and let engine idle before would run smoothly again. Mechanic said it was fuel pump, so replaced with new Bosch fuel pump. Still got same issue however, and it’s getting worse and more frequent. Now getting reduced power at lower revs with fluctuation in power delivery, mid range fine but over 5k revs it almost always loses power. Once this has ‘kicked in’ I lose power throughout rev range and it’s almost like coasting. I either have to select 6th gear and reduce revs right down or idle the engine, and eventually it picks up and I’m back to full power. Assumed this might be bits of old fuel pump in system so ran a bottle of Redex through it but doesn’t seem to have made any difference. Any thoughts? I’m going to take it to Alfa specialist but thought I’d see if anyone had experienced this issue with a V6 Busso engine.
 

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Any other recent work done on the car? I would think given the age of the car it could be related to just about anything, so not just a fuel problem. High rev problems sounds like a MAF issue or vacuum leak from what I have read about on the forums. See if you can get any codes read, as there is no point in throwing away good money replacing all sorts of parts just yet.
 

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Discussion Starter #4
Thanks. I’ve not had an engine management light come on at any point so will there be any fault codes? Am going to an independent specialist with Fiat/Alfa diagnostics so will find out then. Will let you know outcome.
 

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Check the rubber inlet hose flexible section isn't split in the bottom of the convolutions letting air in (usually on the underside so you will have to take it off). If it is and you clean it scrupulously with ie Autoglym engine degreaser (fantastic for cleaning rubber items) and a scrubbing brush or old tooth brush, followed by washing up liquid, rinse well and then use some meths on a cloth finally and leave to dry somewhere warm. You can superglue the split(s) back together very easily and it should last well too.
 

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Dodgy Maf, try unpluging it and see if it makes any difference. Try a throttle re-set. fuel injector braking down or a bad spark plug. I had that on my TS once one plug had a crack in it. For some reason the garage hadn't changed them are it went in for a cam belt change. New plugs and all was back to normal.
 
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