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View Full Version : 99 740il Fuel pump issues


snypa718
05-17-2011, 02:47 PM
What sup I am new to this but I have a 99 740il and I think my fuel pump went bad. I dont know how to see the signs of that but I been getting codes like misfiring in clyinder 6 also fuel cut off. I change the coil pack also the fuel filter which was back up and the code stil pops up which gives me a horrible ride. Can anyone help?
novasol
05-17-2011, 02:57 PM
What's the poll for? :confused
nah2323
05-17-2011, 03:38 PM
you change the spark plugs too? if you're still getting the code, swap coils between two cylinders, and see if the code follows the coil.
Edwin NL
05-17-2011, 03:40 PM
Any vacuum leaks?
snypa718
05-17-2011, 05:28 PM
Well idk as of yet I guess not. My mech told me theres none . Once I drive normal speed itsok then when I accelerate kinda fast then the service light comes on and flash. I can prob have him run a test
seven4d
05-17-2011, 05:30 PM
turn the key on the car to ACC and listen to hear if the fuel pump comes on. you should be able to hear it.
darkstarmedia
05-17-2011, 06:55 PM
Well idk as of yet I guess not. My mech told me theres none . Once I drive normal speed itsok then when I accelerate kinda fast then the service light comes on and flash. I can prob have him run a test

For the most part fuel pumps either work or not... you might want to change your fuel filter. Go to your nearest chain auto parts store and have them read the codes and report back.
snypa718
05-19-2011, 02:28 AM
ok so heres the update. i replace the fuel filter also the fuel pump , replace the coil pack in cylinder 6 also change the injector in cylinder 6 and problem still occurs. the mech did a perssure test and it came out good. when the car is on i took out the coils to see if the engine would change signs and it did for all of them except #6. on the computer it says" cylinder 6 fuel trim cut off" i even change the maf sensor and no response...
IcemanBHE
05-19-2011, 04:26 PM
My guess...a wiring problem between the DME and either the coil or injector for #6.

Pull the #6 coil and see if you have spark there...
IcemanBHE
05-19-2011, 04:43 PM
Btw...I deleted your other thread...no need for multiple threads for the same issue.
snypa718
05-20-2011, 08:08 AM
Theres no spark on cylinder 6 . It does sounds more electrial to me now. Is it as byw as y to find out if its wiring?
swensodts
05-20-2011, 01:37 PM
Theres no spark on cylinder 6 . It does sounds more electrial to me now. Is it as byw as y to find out if its wiring?

English MF'er, Do you Speak it? Sorry not down with all these acroymns, what does the poll mean? and And what is "byw as y"?
snypa718
05-20-2011, 03:11 PM
Do I speak english? Funny guy . Its called mistakes when your replying from a touch screen phone . But I do apologize for setting up a poll as I said before I am new to this so I didnt really know what that was for . But I meant to say does anyone knows something I can try to see if its the wiring ?
DukeEllington
05-20-2011, 03:31 PM
English MF'er, Do you Speak it? Sorry not down with all these acroymns, what does the poll mean? and And what is "byw as y"?


Hey, hey what about some respect for forum members swensodts?


Seven series and cant buy class:rolleyes


I smell alot of hate in your post. could we have a new troll?



On topic: snypa; hope you get this sorted out fast, I'm researching it as well.
tommyb2b
05-20-2011, 03:31 PM
English MF'er, Do you Speak it? Sorry not down with all these acroymns, what does the poll mean? and And what is "byw as y"?

Yeah just some friendly advice for the NOOB, on here we DONT comment on peoples grammar. Like he said he was on his touch screen phone. Some people may not have great spelling but need help all the same ok.
tommyb2b
05-20-2011, 03:41 PM
Do I speak english? Funny guy . Its called mistakes when your replying from a touch screen phone . But I do apologize for setting up a poll as I said before I am new to this so I didnt really know what that was for . But I meant to say does anyone knows something I can try to see if its the wiring ?

It could be I suppose. But honestly I have never seen a wiring problem like this on an E38. They are just too well made in that respect! Have you swapped the coil around to see if the code jumps to another cyl?
swensodts
05-20-2011, 04:04 PM
Bad attempt at humor I suppose, its a quote from Pulp Fiction, anyway . . .My apologies. I thought the pharse "byw as y" was some kind of acroymn or something that I had missed.
IcemanBHE
05-20-2011, 05:55 PM
Its my job to be the grammer police and inform users to clean it up for better help.

But..back at the ranch...Ive personally never run into this either. But if you have no spark on 6, at least we have it narrowed down to electrical. Did you try to swap the coils as mentioned? That would prove if its the coil itself or not. Other than that, your going to have to test that coil wire all the way back.

Here you go. Works best with IE8.
http://www.bmw-planet.com/diagrams/release/en/