Good morning I just wanted to know my Alfa 156 wont rev above 4500 revs and wont give me any power. I have changed the feul pump and took out the knock senser and the MAF sensor has been cleand and changed the tdc sensor has also been changed. When it gets hot it shits down and won't start until it is coold down. It gets feul to the engin.
Yes, good point. Sounds like fuel supply issue to me. If it's petrol, I'd measure fuel pressure at the rail. My guess is very low pressure when fault occurs. It should be 3.5 bar. In a case of intermittent fuel flow and pressure, check fuel pump inside tank for moisture or dirt before changing pump.
Having read this again, I think that diagnostic equipment may be needed but I'd swap over things with the main relay, fuel pump relay and ECU relay with a fan relay to be sure it isn't simply a strange power supply problem. What age of 156 is it? Are you sure the engine management light/info screen is working?
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