89 635 csi no start
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89 635 csi no start
Hello all,
need your help with no- start
my 89 635csi one fine day decided not to start,
occasionally i would fire up for a sec and then died.
First i suspected fuel as i couldn't hear the fuel pumps.
so i jumped the pins on the fuel pump relay ... fuels pumps are fine , pressure seems ok.
replaced fuel pump relay and main relays still no start.
what should be my next step..
need your help with no- start
my 89 635csi one fine day decided not to start,
occasionally i would fire up for a sec and then died.
First i suspected fuel as i couldn't hear the fuel pumps.
so i jumped the pins on the fuel pump relay ... fuels pumps are fine , pressure seems ok.
replaced fuel pump relay and main relays still no start.
what should be my next step..
87 535is ~
83 944 ~
83 635csi -x-
86 635csi great white
83 944 ~
83 635csi -x-
86 635csi great white
- hornhospital
- Platinum Member
- Posts: 2940
- Joined: Sun Jul 11, 2010 6:46 pm
- Location: Silverhill, AL
- Contact:
Re: 89 635 csi no start
Without the relay(s) being jumped, does it have fuel pressure at the rail? The crank sensor (either one) could be bad. The ECU won't fire up the fuel pump if it doesn't "see" the crank turning.
Ken Kanne
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"
Re: 89 635 csi no start
Great direction thanks ill check it.
87 535is ~
83 944 ~
83 635csi -x-
86 635csi great white
83 944 ~
83 635csi -x-
86 635csi great white
Re: 89 635 csi no start
crank sensor was covered in oil smudge,
bench tested it, came out 562 Ohms
replace it ?
bench tested it, came out 562 Ohms
replace it ?
87 535is ~
83 944 ~
83 635csi -x-
86 635csi great white
83 944 ~
83 635csi -x-
86 635csi great white
Re: 89 635 csi no start
Replaced crank sensor from the yard
Replaced good used ecu
Replaced all spark plug wires
New coolant temp sensor.
replaced main and fuel relay with used ones from e30.
What else am i missing here
Replaced good used ecu
Replaced all spark plug wires
New coolant temp sensor.
replaced main and fuel relay with used ones from e30.
What else am i missing here
87 535is ~
83 944 ~
83 635csi -x-
86 635csi great white
83 944 ~
83 635csi -x-
86 635csi great white
- hornhospital
- Platinum Member
- Posts: 2940
- Joined: Sun Jul 11, 2010 6:46 pm
- Location: Silverhill, AL
- Contact:
Re: 89 635 csi no start
Test the crank sensor. I've seen too many of them from the wrecking yard that were DOA.
The main and fuel pump relays from an E30 may not be compatible with the E24.
The main and fuel pump relays from an E30 may not be compatible with the E24.
Ken Kanne
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"
Re: 89 635 csi no start
Thanks hornhospital !
Will do that
Will do that
87 535is ~
83 944 ~
83 635csi -x-
86 635csi great white
83 944 ~
83 635csi -x-
86 635csi great white
Re: 89 635 csi no start
Car fired up when i jumped both main and fuel relay.
What would that point out ?
What would that point out ?
87 535is ~
83 944 ~
83 635csi -x-
86 635csi great white
83 944 ~
83 635csi -x-
86 635csi great white
Re: 89 635 csi no start
What happens when you jump the main relay by itself ?
What happens when you jump the fuel relay by itself ?
Is the E30 relay the correct type ?
Do you have a year specific Electrical Troubleshooting Manual ?
Do you have a multimeter ?
What happens when you jump the fuel relay by itself ?
Is the E30 relay the correct type ?
Do you have a year specific Electrical Troubleshooting Manual ?
Do you have a multimeter ?
1986 635csi LOCUTUS / Arktis Blau Metallic / Pearl Beige / S38B36/ Close ratio dogleg 5sp
2002 E46 M3 / Topaz Blau Metallic / Black Nappa / 6 speed SMG software tuned / Bilstein PSS10 Coilovers / CMP RACP reinforcement
2002 E46 M3 / Topaz Blau Metallic / Black Nappa / 6 speed SMG software tuned / Bilstein PSS10 Coilovers / CMP RACP reinforcement
Re: 89 635 csi no start
baders wrote:What happens when you jump the main relay by itself ?
What happens when you jump the fuel relay by itself ?
Is the E30 relay the correct type ?
Do you have a year specific Electrical Troubleshooting Manual ?
Do you have a multimeter ?
new finding car runs when jumping relay by itself.
fuel relay seems fine.
i have put my multimeter to use, there's voltage at pin 86 on the main relay.
87 535is ~
83 944 ~
83 635csi -x-
86 635csi great white
83 944 ~
83 635csi -x-
86 635csi great white
-
- Posts: 47
- Joined: Mon Mar 11, 2013 12:06 am
Re: 89 635 csi no start
I had what seems like the same problem with my '88 635 Csi - starts for a second and then dies. It turned out to be microscopic cracks in some solder joints inside the ECU. There is tech article that describes how to remove and open up the ECU and points out the three solder joints attached to a aluminum heat sink inside. I touched each joint for just 1 - 2 seconds with a fine tip Hakko soldering iron. Reinstalled the ECU and after months of frustration it started immediately.