CPS ohms and Bentley wrong? no start

[darrenforeal]

Bentley says the crankshaft position sensor should read at around 1280 ohms. But I read others say it is actually 550ohms and bentley is wrong? Mine reads about 545ohms right now. Is that still a possible cause for my no start? Should I get a new one?

The car still doesn't start and I did a ton of searches. So far i jumped the fuel pump relay and I can hear the pump go on. I also checked that fuse. Also when I turn the key on, the volts at the fuel pump read around 12v but it doesn't make noise then.

Basically what happens, is I turn the ignition on and it fires and cranks up to around 1800rpms as normal, but instead of dropping into idle, it dies. This is in the course of about 2 seconds.

So if Bentley is wrong what next should I try?:help

[darknezz7]

I thought the cps would make it not fire at all. sounds like what mine was doing when my icv got stuck closed. posibly maf too.

can you hold the pedal down a little and start it and keep it running? also try unplugging the maf.

[darrenforeal]

I thought the cps would make it not fire at all. sounds like what mine was doing when my icv got stuck closed. posibly maf too.

can you hold the pedal down a little and start it and keep it running? also try unplugging the maf.

And ya I have been getting mixed messages re: the CPS

Also if I try to give it gas it stays going for a bit more( like a sec) but then makes a pop sound and dies.

I'll try unplugging the MAF tomorrow I guess. But I thought I may have found the cause with the CPS reading lower ohms than it should, but now I am getting mixed messages on what it should be. It was so out of the blue. The car was running great.

[DUDMD]

mine read at 524ohm when checked and your CPS is all good man, if it was out then it wouldn't fire at all. Fuel pump only comes on during cranking instead of KOEO like most cars. Your issue is somewhere else, so you need to troubleshoot one step at a time.

[darrenforeal]

mine read at 524ohm when checked and your CPS is all good man, if it was out then it wouldn't fire at all. Fuel pump only comes on during cranking instead of KOEO like most cars. Your issue is somewhere else, so you need to troubleshoot one step at a time.

Damn Bentley failed me. ahhh... I wish I knew that before I took it out. lol. Do you think the fuel pump could still be the issue? Although I did hear it run when I jumped the relay and it was replaced in May of 2006 :/


UPDATE: finding out that the CPS is actually supposed to be around 540 ohms, not 1280 like bentley says, I cleaned it out and try to get rid of all the grease where it sits and reads the crank shaft position. Then I used electrical lubricant on the connections. So i go to turn it on and it starts and stays on!!! Awesome! but WTF. I'm still a little nervous i'll be stranded somewhere.

[darknezz7]

sounds like it just got gunked up

[DUDMD]

my car ran with a ton of grease/dirt on the sensor, but i still cleaned it all up when I pulled it out.

OP: so does the car run fine now or just starts/runs but rough?

[darrenforeal]

sounds like it just got gunked up

ya, still weird that it just wouldn't start all of the sudden though because of that. i am still a little uneasy about it possibly not starting again, but I will keep my fingers crossed.


my car ran with a ton of grease/dirt on the sensor, but i still cleaned it all up when I pulled it out.

OP: so does the car run fine now or just starts/runs but rough?

No, it runs perfect again. Starts just fine and runs well. It's crazy to think that just some gunk on the magnet made that difference. I did spray the connector with electrical lubricant also so there may have been a less than stellar connection there.

[jingjoh]

CAS definitely in the 500-600 ohm range, I went through the same thing 2 yrs ago and found heaps of archives in roadfly E34 section.

The ICV sticking could be an issue too, it would be worth removing it and cleaning it, check it first carefully to see if it sticks in any position.

A mechanic mentioned the PCV plate on the back of the manifold when my friends E39 started doing this, the PCV was new though as was the cam sensor, I am wondering if his CAS is all gunked up or a little low in impedance, something for us to check now that you have cleaned yours and found a change!

[darrenforeal]

CAS definitely in the 500-600 ohm range, I went through the same thing 2 yrs ago and found heaps of archives in roadfly E34 section.

The ICV sticking could be an issue too, it would be worth removing it and cleaning it, check it first carefully to see if it sticks in any position.

A mechanic mentioned the PCV plate on the back of the manifold when my friends E39 started doing this, the PCV was new though as was the cam sensor, I am wondering if his CAS is all gunked up or a little low in impedance, something for us to check now that you have cleaned yours and found a change!

ya it's just crazy that some oil and dirt caused it to stop working all of the sudden, considering it's pretty much a magnet. Again, it also may have been where it connects to the connector, which I used electrical lubricant on.

I'm still uneasy about the whole thing.