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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E30 (1982 - 1993)

E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 05-17-2015, 09:46 PM
Bilsuperman Bilsuperman is offline
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Mein Auto: 1988 325i
Unhappy crank no start

hey guys... i have a 1988 325i
symptoms:
cranks with no start
has spark
has new fuel injectors
has new fuel pump
has new fuel filter
has fuel pressure at engine
no fire at injectors
tried changing ECU
also cleaned all of the connectors

If anybody has any ideas please let me know
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  #2  
Old 05-17-2015, 11:51 PM
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BMWFatherFigure BMWFatherFigure is offline
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Broken wire(s) to injectors. Even your 2nd ECU was defective or incompatable.
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I've just changed my wiper blades and now my reverse lights don't work. Should I change my fuel pump relay?
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  #3  
Old 05-19-2015, 09:35 PM
Valla Valla is offline
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Research the mass air flow sensor- and the crankshaft position sensor (pulse sensor) mounted up front over the crankshaft pulley - Both of these sensors incorporate all ignition and fuel injection systems into the ECU therefore ignition timing is electronically controlled and not adjustable. There are ways to test these sensors. I know for sure you can test the mass air by sticking a volt meter into probe terminal 7 and 12 of your wiring harness to the ecu (should be a 55 pin connector I believe. While opening the throttle body watch for a smooth increase and decrease in resistance as the door on the airflow meter is opened and closed
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  #4  
Old 05-19-2015, 09:38 PM
Valla Valla is offline
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post a new thread to find out how to adjust or test the pulse sensor. I am guessing a straws like you right now
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  #5  
Old 05-20-2015, 04:57 AM
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BMWFatherFigure BMWFatherFigure is offline
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Valla, if he has spark and fuel pressure it cannot possibly be the CPS defective. Without specific test equipment it is hard to tell where the problem is, IE injectors not opening or burnt /defective plug leads.

Bilsuperman, are the plugs wet after cranking? Did you get a spark at the plullead end or coil output? Wet pulgs, attention to HT leads etc, Dry plugs - injector electrics.
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Current:
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E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
I've just changed my wiper blades and now my reverse lights don't work. Should I change my fuel pump relay?
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  #6  
Old 05-20-2015, 03:02 PM
Bilsuperman Bilsuperman is offline
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Quote:
Originally Posted by BMWFatherFigure View Post
Valla, if he has spark and fuel pressure it cannot possibly be the CPS defective. Without specific test equipment it is hard to tell where the problem is, IE injectors not opening or burnt /defective plug leads.

Bilsuperman, are the plugs wet after cranking? Did you get a spark at the plullead end or coil output? Wet pulgs, attention to HT leads etc, Dry plugs - injector electrics.
Ok... We put ether in it and it starts... And the spark plugs are dry
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  #7  
Old 05-20-2015, 04:02 PM
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downhiller downhiller is offline
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next check for the injectors clicking. long screwdriver is best way.

could of also knocked some junk free somewhere in the fuel line and clogged the new injectors
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  #8  
Old 05-20-2015, 04:12 PM
Bilsuperman Bilsuperman is offline
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Quote:
Originally Posted by downhiller View Post
next check for the injectors clicking. long screwdriver is best way.

could of also knocked some junk free somewhere in the fuel line and clogged the new injectors
It hasn't started so I can't check for the clicking
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  #9  
Old 05-20-2015, 06:10 PM
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hornhospital hornhospital is offline
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It doesn't have to start for the injectors to click. Just spinning it over trying to start it should have them firing.
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  #10  
Old 05-20-2015, 06:25 PM
Bilsuperman Bilsuperman is offline
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the injectors do not fire

Last edited by Bilsuperman; 05-20-2015 at 06:26 PM.
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  #11  
Old 05-20-2015, 06:25 PM
Bilsuperman Bilsuperman is offline
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it pains me to say it because its an amazing looking car, but its about to go to junk
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  #12  
Old 05-20-2015, 06:32 PM
Bilsuperman Bilsuperman is offline
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it has power at the injectors... bwtween 1.6 and 2.0 when trying to start
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  #13  
Old 05-20-2015, 06:50 PM
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hornhospital hornhospital is offline
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VOLTS? It should have 12v at the injectors when the key is on. They are fired by GROUNDING them through the ECU.
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Quotes to live by:
guessing gets expensive...drivinfaster
nothing is more expensive than a cheap BMW...c4harpe13
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Ken Kanne, Silverhill, AL, E36 Forum Mod/Craigslist addict/Hoarder of all sorts of stuff
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1995 318is "Bebe"; 1993 325is "Elvira"; 1985 635CSi "Katja"; 1984 633CSi "Sylvia"; 1987 325is "Odette"

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  #14  
Old 05-20-2015, 07:06 PM
Bilsuperman Bilsuperman is offline
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is there a sensor that could cause the injectors not to fire?
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  #15  
Old 05-20-2015, 10:10 PM
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hornhospital hornhospital is offline
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No. Only the crank position sensor, and you have spark, so that eliminates the possibility of it being bad. You would have no spark and no fuel pressure if the CPS were bad, because it lets the ECU know that the crank is turning when you try cranking it, and that tells the ECU to turn on the fuel pump, the injectors and the the ignition pulses.

The very low voltage at the injectors is really suspicious.
__________________
Quotes to live by:
guessing gets expensive...drivinfaster
nothing is more expensive than a cheap BMW...c4harpe13
buying a ratty example (of a BMW) is a parasitic relationship.(and you ain't the mosquito) 7pilot
Ken Kanne, Silverhill, AL, E36 Forum Mod/Craigslist addict/Hoarder of all sorts of stuff
BMW-CCA #441426
1995 318is "Bebe"; 1993 325is "Elvira"; 1985 635CSi "Katja"; 1984 633CSi "Sylvia"; 1987 325is "Odette"

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  #16  
Old 05-20-2015, 10:36 PM
Bilsuperman Bilsuperman is offline
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Quote:
Originally Posted by hornhospital View Post
No. Only the crank position sensor, and you have spark, so that eliminates the possibility of it being bad. You would have no spark and no fuel pressure if the CPS were bad, because it lets the ECU know that the crank is turning when you try cranking it, and that tells the ECU to turn on the fuel pump, the injectors and the the ignition pulses.

The very low voltage at the injectors is really suspicious.
What could that mean?
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  #17  
Old 05-21-2015, 02:06 AM
Bilsuperman Bilsuperman is offline
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also could this be the round connector that is below the intake?
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  #18  
Old 05-21-2015, 04:43 AM
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downhiller downhiller is offline
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recheck the connections and look for corrosion on the pins.
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  #19  
Old 05-22-2015, 05:43 AM
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BMWFatherFigure BMWFatherFigure is offline
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+1 on downhiller
__________________
Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL; E34 535i; 2 X E38 735iL (Oxford Green and Alpine White); R50 Cooper; R55 Cooper Clubman. E38 Parts Car
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
I've just changed my wiper blades and now my reverse lights don't work. Should I change my fuel pump relay?
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