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Downhilljack

330D down on power :(

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Hello

 

I am really hoping one of you wise folk can help. 

Right story so far- 

 

My 2003 330d sport has been lacking power for a while, it feels sluggish and when you hit 3000rpm the power tails off sharply. It had a maf fault so this has been changed with new Bosch unit- no difference. To confirm this I had a dyno run and it was only making 145bhp. It was remapped after the first run and now makes 185bhp, but the tuner told me it should be making 290bhp and something is holding it back. Live data from my modis shows that the actual maf signal is way below expected signal even though it's a new unit. 

 

Any help greatly appreciated! 

Many thanks Jack 

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 Have you tried another maf sensor? Just 'cause it's new it doesn't mean it works. 

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 If the maf is ok then the next thing I would be checking for is air/vacuum leaks. Or possibly a bad connection or break in the wiring to the maf. Also, it may be worth  putting this in the e39 section as they are fitted with the same engine and there are some knowledgeable chaps up there^^. 

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Your symptoms are very similar to signs of in line fuel pump failure on an E39 530d, I'd assume an E46 would have a setup much the same. 

 

Mine would barely rev above 3k and was sluggish below, but I swap out the pump and all was well. 

 

Is it possible your Maf readings are due to the boost being cut due to lack of fuel pressure? 

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Thanks for the input, the low pressure fuel pump has been changed. 

 latest is-

its been to a BMW specialist, all systems checked and found ok. They can't find anything wrong and suggest that the turbo may be worn and not spooling up properly. Expensive thing to try though if it doesn't find that 100hp that's missing. 

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