Marcusdil

Having used the car now for a couple of days I can say that the noise is no more.I took the car to main BMW dealer and the mechanic sat in the car with me.....Of course the noise wasnt occuring..typical.Anyway I played a recording of it to him and although they had replaced the fuel line under warranty, he said that the noise is related to the HPFP.In many cases replacing the fuel line only does solve the problem but if not, then the pump needs to be replaced.Although the pump was working with no fault code it was creating an uneven flow of fuel causing vibration of the fuel the pipe.Replacing the pipe often solved the problem because sturdier clips are used to make the pipe more rigid and thus eliminating the noise.I guess this is the stock remidy that BMW adopted as it was not necessary in all cases to replace the pump . So for anyone coming across this post with humming/croaking noises,be assured it is the HPFP causing the problem and if you are lucky, replacement of the fuel pipe might stop the noise but if not then the pump will have to be replaced.I am assuming they have upgraded the pumps now.The BM mechanic was not sure what caused the actual problem in the pump but added that it is the first sign of the pump failing and could be due to cheap supermarket fuel corroding the internals. The 'noise' is a known issue at BMW and incidently in North America there was a blanket recall to replace the pumps on certain year cars. The BMW dealer really looked after me on this and although there was not a fault code generated by the HPFP, they replaced it under the 12 month used car warranty. I 'rest my case' and now can start enjoying the car...Thanks everyone for you input on this and I hope my re telling my experience will help someone else with 'frogs' in the engine.

UPDATE! Main BMW dealer had the car back again for 2 days.Got it back today.....They changed the HPFP under warranty....So far no croaking noise.Could be a result,will update again in a couple of days.........

Yes does sound if its from under the passenger seat area....Dealer wants me to go in with the car tomorrow to see if I can replicate the noise for them but not sure it will be a waste of time because they are not going to replace the HPFP just on hearing a croaking noise...Will just have to wait till it packs up like yours did.Will let you know the outcome....Thanks for you input on this.

Yes I will keep you updated as to outcome. Meant to ask you if you still have the car as I see your original post was August last year.If so, are you still 'chirp/croak free?

Hi Andrew, No, the noise was not present on my last car.It went into limp mode a couple of times during last couple of months with the engine icon coming on but as soon as I restarted the engine it cleared then came back again.It was due in for a service at my 'indi' and I mentioned it to them.They rang me to say it had error code and was the HPFP and needed to be replaced so I got them to do it. Didnt bother with a warranty on my previous car as from years of various BM s and no issues I was under the assumption they were bullet proof...not anymore me thinks.Anyway they charged me £400 fitted. With this 'chirp' car I am told the warranty does not cover odd noises.. apparently. I assume it would cover a replacement HPFP.The only way it seems that I would get the pump changed under the warranty was if the pump actually failed and an error code created...Seems that might happen sometime soon. (I am in UK and bought it from local BMW main dealer.)......Oh happy days!

Hi Andrew, Thanks for reply.This is interesting...So it seems it might be the fuel pump...Interesting because there seems to have been some issues with the fuel pump on certain 325i e90 and e92 of 2008 year or thereabouts.I bought the car beginning of Feb from main BMW dealers. Coincidently I p/exed my 325i auto (2008) and I had to have the fuel pump replaced on that because of the same symptoms you had of car going in to limp mode and the yellow engine light on but no chirping issues.It was an expensive week and that prompted me to change the car..I fancied a manual to the auto anyway.It could the dreaded fuel pump curse is following me! As I said BMW dealers had the car in this last week and played them a recording of the noise and they said there is a notice on their Puma system and a known fault and the cure was to replace the fuel pipe ..which they did 'apparently'.This was done on the used car warranty and through goodwill they say I would not be charged as normally noises that come and go are not covered and added to the fact I had only had the car for a few weeks..That cheered me to know the problem was solved and no more 'croaking'noise.Until I drove it.... got about 8 miles and then the 'frog' was chirping away as I waited at some lights.Really P****d off now.Rang them and they want me to take the car back to them to see if the noise is present.Now they say they could not hear the noise at all during the time they had it.Beginning to think I'm going round in circles and now I am thinking that I will try and find where the noise is coming from and try and sort it myself.I am sure next time they will replace something else and bill me anyway and it still might not be solved.Thanks for your input Andrew on this, as the more I research the issue the sooner I will get it sorted...hopefully

Hi, I have the same issue with the same noise.Car went to dealers last week and they replaced a fuel pipe under the warranty (Said that was the problem).Well got car back and still this strange croaking noise,,,,wondered if you ever found a solution as to what it is and the fix.