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Author Topic: Both CPS? at the same time?  (Read 16155 times)

Wrench

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Both CPS? at the same time?
« Reply #15 on: March 18, 2012, 07:58:02 PM »
I've seen the short rubber coupling hose fail on some pumps. It has a sort of dampener assembly but it could be leaking or it's been replaced by a poorly fit hose. It's worth pulling it out and having a look. Fairly easy procedure.
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If it don\'t work, mess with it. If it breaks, it needed replacing anyway.

Geoff

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Both CPS? at the same time?
« Reply #16 on: March 19, 2012, 05:25:18 AM »
to answer your question,  I have seen fuel pumps go bad where they would "make a noise" but not pump fuel.   if the fuel supply to the pump is unrestricted, then the pump must be bad.
                                                            Geoff
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sfinsf

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Both CPS? at the same time?
« Reply #17 on: March 19, 2012, 02:52:29 PM »
Thanks guys, ordered the TRE pump today.

Dave, thanks for the link. The best part was that I discovered in the process of reading the entire thread, "Zen and the Art of e30 Maintenance".... Holy Crap, if you havent seen his build, it's a must read. Serious M42 porn!
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sfinsf

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no start update - help!
« Reply #18 on: April 28, 2012, 08:45:30 PM »
Alright guys, could use some more input/help. Still battling this no-start. The list is long now...
 - new fuel pump TRE 340, it's getting 12v and is pumping fuel to rail
 - bought stethoscope, confirmed injectors are working, no way to know for sure if they are providing proper spray
 - have spark, checked all wires and plugs
 - checked all vacuum hoses
 - both cps test at appropriate ohm readings
 - new battery
 - new main and FP relays
 - new plugs
 what is next?
It cranks solidly, makes little back fire sound in intake/airbox, plugs are wet after cranking it over a bunch
I'm thinking at this point that it could either be,
 - not enough fuel pressure?
 - bad injector? Would that result in a no-start?
Please chime in....:confused:
« Last Edit: April 29, 2012, 09:04:30 AM by sfinsf »
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bmwman91

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Both CPS? at the same time?
« Reply #19 on: April 28, 2012, 10:52:16 PM »
Weird. It sounds like the fuel system has been properly covered.

Here's a long shot, but it happened to me once. The EPROM in the ECU was loose in its little socket. It took forever to think to look in there, but I eventually did & it wasn't seated. Did you ever install a performance chip or anything?
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sfinsf

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Both CPS? at the same time?
« Reply #20 on: April 29, 2012, 09:05:59 AM »
no, I havent messed with ECU at all, I will look at it today. Any way I could pay you for some onsite diagnostics, I'd rather give you money for your new motor than give it to a random machanic.
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bmwman91

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Both CPS? at the same time?
« Reply #21 on: April 29, 2012, 05:38:02 PM »
Where are you located? I usually take FOOD as payment for work for fellow enthusiasts!
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Visit HERE for a plethora of 318iS stuff and some other randomness.  Would you say I have a, plethora, of pinatas?

sfinsf

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Both CPS? at the same time?
« Reply #22 on: April 29, 2012, 08:15:06 PM »
I'm in Moraga, food, beer, cash, whatever you need the most! Tried a bump start today, no luck.

Inspected ECU with my limited experience and all seems well and connected solidly.
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bmwman91

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Both CPS? at the same time?
« Reply #23 on: April 30, 2012, 01:48:43 AM »
As far as helping out...I am out of commission for a little while. My M42 had a timing chain oops, and I am having a custom motor built to replace it, so I don't have a car at the moment. I also fly to Seattle for work every Sunday-Monday, so that doesn't help anything! I bet I can work out a Saturday to check it out though.

At this point, it sounds like the issue is just going to end up being ONE stupid thing. If it is getting fuel and spark, and the crank sensor is working, it should run. If the fuel or spark was malfunctioning, it should at least run POORLY. The total lack of running indicates that something critical in the control system is pooped out or disconnected. Have you cleaned the idle control valve? Does opening the throttle when trying to start it help at all?

The motor should at least run (badly) if the throttle sensor or air meter were busted. The same goes for the ignition coils...all 4 would have to be totally dead to prevent it from running at all. I think that something in the controls is pooped out so that the ECU is not firing the ignition coils, because if you have fuel, some ignition activity would lead to some sort of operation.

Did you remove the ECU entirely? Did you shake it to see if anything was rattling around inside? I would assume that a loose EPROM would mean that you got NO fuel injection at all, so it seems unlikely that this is the culprit. Since the car died while driving, it obviously isn't like you unplugged or switched something.

The one other thing I can think of is that the ignition coil driver IC crapped out. It has happened. The coils get constant 12V, and the ground gets switched through the ECU, so getting 12V at the coils isn't indicative of anything other than that the main relay is working. Is there anyone local to you with a spare ECU, or just the one out of their M42 that you can plug in to see if that helps? At this point, a dead ignition driver IC seems like the most likely culprit. Sorry I didn't think of that sooner.

I'd lend mine to you, but the car is 20 miles away and not running lol. There are other Bay Area guys on here...surely someone can lend a hand and ECU!
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sfinsf

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Both CPS? at the same time?
« Reply #24 on: April 30, 2012, 07:41:15 AM »
sounds like a mighty busy schedule!
gave the ICV a little clean and inspect when I removed the mess under the intake, but what is best, complete method?
when you say "open the throttle" are you referring to removal of the boot? or manually or what?
did not pull ECU, i will try that next. Is the Ignition Driver IC an electronic component on the board of the ECU that can be replaced?
Appreciate the input!
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bmwman91

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Both CPS? at the same time?
« Reply #25 on: April 30, 2012, 10:31:01 AM »
Sorry, when I say "open the throttle" I mean to push the gas pedal a little. If the ICV is stuck shut, opening the throttle a little like that would let in some air.

If the coil driver is dead, you COULD solder in a replacement, but I don't think that that IC is commercially available. You would have to pull one from a known-good ECU...and at that point, you might as well just swap the ECU. They are really cheap on the forums. It would be fun to find some sort of modern driver IC with the same pinouts & develop a database of new-replacement parts for our aging ECUs though! I think it's called Megasquirt........
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Visit HERE for a plethora of 318iS stuff and some other randomness.  Would you say I have a, plethora, of pinatas?

sfinsf

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4 days in the shop
« Reply #26 on: May 29, 2012, 11:52:24 PM »
so I finally gave in and took my 318is into a shop to see if they could get it to start. After 4 days of testing and diagnosing, they called to say they had given up. I purchased a used DME at one point and that seemed to make things worse. So far all sensors test out good and everything seems to operate on it's own, it's when all are together that some part of the system doesn't function as it should. I'm still in a no start situation and sadly have to tow my girl home and start replacing parts.
If anyone is following this thread, here is where I am going next.
- purchased OEM fuel pump, to replace TRW that I just recently installed
- purchased new Cam sensor
right now the fuel pump is producing correct pressure, the issue is that the DME is not firing the injectors (or so it seems), when bench tested they all work as they should
fuel pump fuse blows according to tech, so I am hoping that the OEM model will eliminate this issue. :mad
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sfinsf

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Both CPS? at the same time?
« Reply #27 on: June 25, 2012, 02:11:49 AM »
I'm about ready to give up and sell my 318is. No one can seem to bring this engine back to life. Anybody have any new ideas on what to check/look for? We have replaced and tested so much stuff I'm beginning to lose it. This damn M42 has all it needs to start but just wont come back to life.

Please help!!
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keflaman

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Both CPS? at the same time?
« Reply #28 on: June 25, 2012, 07:13:02 AM »
Quote from: stjE30go;113356
I'm about ready to give up and sell my 318is. No one can seem to bring this engine back to life. Anybody have any new ideas on what to check/look for? We have replaced and tested so much stuff I'm beginning to lose it. This damn M42 has all it needs to start but just wont come back to life. Please help!!


It appears you have spark, air and fuel, but do you have compression?

Looking through your thread http://m42club.com/forums/showthread.php?t=14555 regarding the timing chain makes me wonder if the timing sprocket on the crank was also changed and if not, is it worn enough for the chain to have skipped a tooth?
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sfinsf

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Both CPS? at the same time?
« Reply #29 on: June 25, 2012, 11:32:23 AM »
Quote from: keflaman;113360
It appears you have spark, air and fuel, but do you have compression?

Looking through your thread http://m42club.com/forums/showthread.php?t=14555 regarding the timing chain makes me wonder if the timing sprocket on the crank was also changed and if not, is it worn enough for the chain to have skipped a tooth?


when it was at the shop, the mechanic tested compression and confirmed that it was very good. He also confirmed that the timing was correct based on a visual crank check
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