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Forum LockedCan crank sensor cause car not to start?

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L8RNS View Drop Down
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    Posted: 26-February-2008 at 22:02

HI MY CRANK SENSOR WAS DIGNOSED FAULTY A MONTH AGO IT WAS HAVING PROPBLEMS STARTING BUT NOW I TRY TO START IT IT TURNS OVER FOR AFEW SECONDS THEN MAKES A ZZZZZZZZ NOISE THEN I KEEP TRYING TO START AND IT KEEPS HAPPENING?THEN EVENTUALLY AFTER 10 MINS IT STARTS.

ANYONE HELP?

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L8RNS View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote L8RNS Quote  Post ReplyReply Direct Link To This Post Posted: 26-February-2008 at 22:17
OH AND I HAVENT REPLACED THE SENSOR YET,IM JUST VERY PARANOID WITH THIS CAR BECAUSE IT SEEMS TO ME THAT A SENSOR COULDNT GIVE ME THEESE OUT COMES.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote < FORZA WEST Quote  Post ReplyReply Direct Link To This Post Posted: 26-February-2008 at 22:23

The crank shaft sensor is needed for the firing order reference.If the signal fails it cant start.

ZZZZZZZZZZZZZZZz no idea

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Post Options Post Options   Thanks (0) Thanks(0)   Quote L8RNS Quote  Post ReplyReply Direct Link To This Post Posted: 26-February-2008 at 22:26
SORRY LOL OK IT SOUNDS LIKE YOU TURNED THE HOOVER ON AND THE TICKING OVER HAS STOPPED.I HOPE THATS BETTER
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jetsetwilly2000 Quote  Post ReplyReply Direct Link To This Post Posted: 27-February-2008 at 14:37
DOES YOUR KEYBOARD HAVE A CAPSLOCK KEY? 

what car is it? 
The zzzz/hoover noise - could it just be the starter motor winding down?

had endless trouble with my E34 a while ago, turned out to be a failing alarm/immobiliser.  The CPS showed a fault but was not to blame, but in theory it certainly could be the CPS.

The takehome message unfortunately is you have to start investigating - I'd start with listening in the boot for the fuel pump, then changing the fuel filter (cheap and easy tests).

Best of luck!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote stheaney2007 Quote  Post ReplyReply Direct Link To This Post Posted: 27-February-2008 at 21:35

yes mate definatley, i had an e30 325i, when i tried to start it would wind and wind, when u take the HT lead off one of the plugs and hold it to the head it wont spark, this is the the crankshaft sensor.....thats what mine was!!!

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Post Options Post Options   Thanks (0) Thanks(0)   Quote < FORZA WEST Quote  Post ReplyReply Direct Link To This Post Posted: 27-February-2008 at 23:15

Thats probabely the secondary air intake system firing up,runs for about 2 - 3 mins during warm up phase.

They become noisy and sound just like a hoover.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote thepits Quote  Post ReplyReply Direct Link To This Post Posted: 27-February-2008 at 23:42

L8RNS - please don't shout

Originally posted by <FONT face=Arial><strong>Forum Rules and Guidelines Forum Rules and Guidelines wrote:

No Cap Locks.
Please do not post messages with the subject or post all in capital letters, or your message will be deleted. Words all in capitals are not only annoying but are read 50% slower than normal writing.

lookie here...... http://www.bavarian-board.co.uk/forum_posts.asp?TID=10&P N=1

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Post Options Post Options   Thanks (0) Thanks(0)   Quote 540 V8 Quote  Post ReplyReply Direct Link To This Post Posted: 29-February-2008 at 12:04

Failed crank sensor will cause the engine not to start. The control unit needs to know what position all the cylinders are at so it can send signals to the rest of the systems that run the engine. Without knowing this basic information the engine has no way of running.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Cambell Quote  Post ReplyReply Direct Link To This Post Posted: 29-February-2008 at 16:27
My E39 had the crank sensor go, caused intermittent starting and then failed while doing 50MPH (not a good feeling) Just change it mate, only a few £££s from ECP
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Post Options Post Options   Thanks (0) Thanks(0)   Quote L8RNS Quote  Post ReplyReply Direct Link To This Post Posted: 01-March-2008 at 14:43
thanks guys i had the crank sensor done and WOW it has made a big diffrence in drive,gearchange and starting.the wind noise was the starter motor but its ok now that i had the crank done.thanks guys
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 540 V8 Quote  Post ReplyReply Direct Link To This Post Posted: 03-March-2008 at 20:29

Originally posted by L8RNS L8RNS wrote:

thanks guys i had the crank sensor done and WOW it has made a big diffrence in drive,gearchange and starting.the wind noise was the starter motor but its ok now that i had the crank done.thanks guys

That's what we are here for!

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Post Options Post Options   Thanks (0) Thanks(0)   Quote bmr4evr Quote  Post ReplyReply Direct Link To This Post Posted: 10-May-2008 at 08:32
Originally posted by L8RNS L8RNS wrote:

thanks guys i had the crank sensor done and WOW it has made a big diffrence in drive,gearchange and starting.the wind noise was the starter motor but its ok now that i had the crank done.thanks guys



congratulations!  did you replace both crank sensors (intake and exhaust), or just one of them?

to all experts in this board, i replaced my intake crank sensor only and the car was fine for a week, but now it seems like i am having the same problem again.  did the exhaust sensor just failed, or maybe i didn't do a good job installing the new one?  thanks, any help would be appreciated!

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Post Options Post Options   Thanks (0) Thanks(0)   Quote kbannon Quote  Post ReplyReply Direct Link To This Post Posted: 10-May-2008 at 09:49
There is only one crank sensor!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bmr4evr Quote  Post ReplyReply Direct Link To This Post Posted: 11-May-2008 at 06:42
Originally posted by kbannon kbannon wrote:

There is only one crank sensor!


hmmm, maybe i got myself confused between crank and camshaft...

an auto-part store employee told me that a camshaft position sensor is the same as crank position sensor.  we were discussing code P0340 which stated that "the camshaft position sensor is monitored for error" for my car.  i expressed my doubts that they were the same, but he insisted that they were.  so are they really not the same thing?  sorry, if this question sounds dumb...  and thanks for clarifying...

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Post Options Post Options   Thanks (0) Thanks(0)   Quote kbannon Quote  Post ReplyReply Direct Link To This Post Posted: 11-May-2008 at 09:47
My 523i has only one cam sensor also
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