Author Topic: Yes, another crank no start.  (Read 17726 times)

Dusty B

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Yes, another crank no start.
« Reply #15 on: December 19, 2012, 07:17:50 PM »
Double post.
« Last Edit: December 19, 2012, 07:20:48 PM by Dusty B »
91 318is: Alpine Slicktop-work in progress!

Dusty B

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Yes, another crank no start.
« Reply #16 on: December 19, 2012, 07:19:37 PM »
Have now also drained the tank. Given it 4 gallons of fresh 91, cranked car while supply line off rail and let purge line into a drain pan. Reconnect supply line and try to start. Remember, I'm cranking with dry plugs and letting the cylinders dry out between tests also.....

No difference to report.
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sfinsf

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Yes, another crank no start.
« Reply #17 on: December 19, 2012, 09:39:19 PM »
Dont give up Dusty! I got super discouraged many times, thought I tried everything, brought it to a mechanic, he had it for four days, still no luck, couple of tow bills and then after more than six mths of nothing I brought it to another fresh set of eyes, he hooked a computer up to it and found it in a hour. It was the damn cps that three other qualified people had checked. Just keep running through all the major sensors and input, you will find it! It will make your week, even your month. It made me realize how important sticking to the basics are. If nothing else, you will know your M42 really well and you'll love it even more. :D

Make sure you try everything anyone suggests, even if you think you've done it.
91\' 318is
89\' 325i

Dusty B

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Yes, another crank no start.
« Reply #18 on: December 20, 2012, 06:04:40 AM »
Quote from: sfinsf;118632
Dont give up Dusty! I got super discouraged many times, thought I tried everything, brought it to a mechanic, he had it for four days, still no luck, couple of tow bills and then after more than six mths of nothing I brought it to another fresh set of eyes, he hooked a computer up to it and found it in a hour. It was the damn cps that three other qualified people had checked. Just keep running through all the major sensors and input, you will find it! It will make your week, even your month. It made me realize how important sticking to the basics are. If nothing else, you will know your M42 really well and you'll love it even more. :D

Make sure you try everything anyone suggests, even if you think you've done it.


Haha, thanks for the encouragment. I agree, that the basics is where it's at. That's what led me to drain the tank last night. The wet plugs didn't smell like fresh gas to me. Took a look at the tank, drain plug still had factory undercoating on it, and had never been pulled! Drained tank and there was a distinct discoloration to the fuel, and just didn't smell strong (condensation anyone???). It made no difference though as I suspected it wouldn't, but it's something else to check off the list.

Another task performed last night was removing the ICV and bench testing. Got nothing out of it... appears dead. I'm assuming the WOT start test would bypass the ICVs usefulness and still allow to start if everything else was ok?

Another oddity last night. I actually got one singular exhaust pulse/puff out of her last night. Heard that "ignition noise" and then a monster can that happened to be 3 feet away from the exhaust started rocking back and forth, almost falling over. Wasn't a fireball or anything like that, just something I noted.

Intake may be coming off next. Judging from the ICV hoses, I'm sure to find other cracked/nearly broken vacuum lines. Thinking of trying to figure out my own vacuum distribution block to clean up the nest underneath.

I have from tomorrow till Jan 3rd off, with mulitple days free. So I may just be holed up in the garage trying to figure her out. If anyone nearby wants to come by and lend an eye/ear and wants some food and beer, by all means let me know.

EDIT:Something else to keep me busy I think. Found what I believe is an aftermarket Alpine alarm system under drivers side knee bolster along with a switch wired to it for some reason.... I did not recieve any remotes for this system. I don't feel it's the culprit, as I'm getting spark and usually those interupt ignition.... Still, it would be good just to remove anyhow.
« Last Edit: December 20, 2012, 07:35:13 AM by Dusty B »
91 318is: Alpine Slicktop-work in progress!

colin86325

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Yes, another crank no start.
« Reply #19 on: December 20, 2012, 09:01:19 AM »
What brand was the aftermarket CPS?

Also, a dead ICV can cause a no-start condition because it is supposed to be open part-way to admit air during the cranking process.  You might be able to remove the ICV from the hose circuit and start the car.

My friend who is a mechanic always removes aftermarket alarms whenever there's a problem starting a car.

Dusty B

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Yes, another crank no start.
« Reply #20 on: December 20, 2012, 10:11:03 AM »
Quote from: colin86325;118648
What brand was the aftermarket CPS?

Also, a dead ICV can cause a no-start condition because it is supposed to be open part-way to admit air during the cranking process.  You might be able to remove the ICV from the hose circuit and start the car.

My friend who is a mechanic always removes aftermarket alarms whenever there's a problem starting a car.


Think the brand for AM CPS was "Forecast".

I did exactly just that, and removed it from the equation just to see if any change at all, which there was none :(.

I am going to remove the alarm. Maybe that'll be my next project. I'm trying to keep from touching too many things at once to eliminate myself from being my own enemy and problem generator. Change one thing, put it back, move on.
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colin86325

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Yes, another crank no start.
« Reply #21 on: December 20, 2012, 11:15:51 AM »
Facet seems to be the popular CPS brand that I see the most.

BTW, the air gap spec for the M20 and M50 engine is 1mm +- .3mm

Good luck with the alarm removal.

Dusty B

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Yes, another crank no start.
« Reply #22 on: December 20, 2012, 11:28:52 AM »
Quote from: colin86325;118650
Facet seems to be the popular CPS brand that I see the most.

BTW, the air gap spec for the M20 and M50 engine is 1mm +- .3mm

Good luck with the alarm removal.


I did notice the Facet branded one also.

Thanks for the gap spec. I'll try to hunt down the m42 one. I can tell you just from installing that sensor last night thought that it's air gap is MOST deffinitely larger than 1mm when installed....

Possible for CPS to see some signal to turn on the pump, but not see a clear enough digital signal to time correctly? Who knows.

I think I need as much luck as I can get with this one!
91 318is: Alpine Slicktop-work in progress!

colin86325

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Yes, another crank no start.
« Reply #23 on: December 20, 2012, 11:54:20 AM »
FYI, I was reading another thread where a guy replaced the CPS several times with  aftermarket sensors that read too high (900+ ohms). Finally a genuine BMW sensor worked.  So you might want to see what the resistance is on the sensor you just bought.

http://forums.bimmerforums.com/forum/showthread.php?t=1680085&page=3


As fars as your question, who knows!  I've also heard rare cases where the harmonic balancer came loose or even delaminated against its rubber, resulting in an inaccurate CPS signal.

Dusty B

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Yes, another crank no start.
« Reply #24 on: December 21, 2012, 08:16:54 AM »
Yeah I've gone over just about everything....

Have a few leads out for puters right now. Going to grab one as a spare if nothing else. Also have to try to find a ICV and fix all the vacuum hoses.

EDIT:Picking up known good puter after work. Hopefully I'll have time to instal on Monday and see if it helps.
« Last Edit: December 21, 2012, 08:46:22 AM by Dusty B »
91 318is: Alpine Slicktop-work in progress!

Geoff

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Yes, another crank no start.
« Reply #25 on: December 22, 2012, 07:37:24 AM »
I hope a new computer does it for you.   I am kinda leery of an aftermarket
one,  hopefully you can get your hands on a good original one.  Cleaning up the mess of hoses under the intake "may" not solve your main problem, but it is a great way to eliminate about 300 possible vacuum leaks..and I  have found vacuum leaks to be a problem for these cars when all that stuff is original.
                                                                 Geoff

Dusty B

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Yes, another crank no start.
« Reply #26 on: December 25, 2012, 08:30:24 PM »
No updates to report. Haven't been to my garage where the car is stored. I did pick up a known good outer and icv on Friday after work. Might make it down to change them in next day or so. Hope everyone had a good Xmas.
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bmwman91

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Yes, another crank no start.
« Reply #27 on: December 25, 2012, 10:36:56 PM »
How did you check the fusible link? Visually, or did you check for 12V at the second, smaller terminal block up on the firewall above the main one?

When you crank it, can you smell raw gas in the exhaust, or if you pull a spark plug is it wet with fuel? It sounds like fuel is not being delivered. This could be from a bad pump, clogged filter, dead pressure regulator (unlikely) or bad connection in the injector wiring harness.

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bmwman91

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Yes, another crank no start.
« Reply #28 on: December 25, 2012, 10:36:57 PM »
How did you check the fusible link? Visually, or did you check for 12V at the second, smaller terminal block up on the firewall above the main one?

When you crank it, can you smell raw gas in the exhaust, or if you pull a spark plug is it wet with fuel? It sounds like fuel is not being delivered. This could be from a bad pump, clogged filter, dead pressure regulator (unlikely) or bad connection in the injector wiring harness.

06/05/2011 - 212,354 miles
Visit HERE for a plethora of 318iS stuff and some other randomness.  Would you say I have a, plethora, of pinatas?

Dusty B

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Yes, another crank no start.
« Reply #29 on: December 28, 2012, 05:30:35 PM »
Welp..... I'm almost ready to give up on this car. Known good and correct puter and icv in her now. No change.
91 318is: Alpine Slicktop-work in progress!