Trying to get my E30 on the road again. It was initially parked because I couldn't figure out what was going on.
1986 325e All stock
Found 2 bad fuel pumps, so I converted to a single high pressure in tank pump.
Once I had fuel, I just knew it would start.... no dice. I had no spark now either.
I went through all the Bentley manual's ignition diagnostics.
Installed New spark Plugs (someone had platinums in it)
Coil checks good.
No Ground signal coming from DME to fire the coil. (Checked with test light)
Found 1 blown fuse, (interior lighting etc)
Replaced fuse, checked all relays (good)
Unplugged both engine speed and pulse sensors, and both checked good with Ohm meter. (plugs are very brittle on sensor side and started cracking apart) Plugged back in, and checked for Ground signal at coil. We have a flashing test light now!!!
The old girls starts up, though rough. I was thinking that a couple of injectors were stuck, because after letting it run for a few minutes, getting it up to temperature, and giving it some RPM off and on, everything cleared up for the most part. I took it for a quick spin up the road and back, and all seemed good. I shut it off, so I could tie up some loose ends and put little stuff back together in the fuel pump area. Start it up again, to move it into the shop. Now its firing on about 3 cylinders sounds like. Run out of time.
Come back that night, and won't start at all. Sounds like 1 cylinder is firing way late through exhaust or something. Loud ticking once per engine revolution.(estimate) Throw hands up and go to bed.
Current Status:
Back to having no gound signal to fire the coil. Although the loud ticking when cranking has stopped also.
Double checking Crank sensors. Both ohm out within spec.
Decided to check voltage coming to these sensors. One of the plugs, I get 5v on the first pin, a few mV on middle pin and ground on 3rd pin. (seems right) The second plug however, I have 1.5v on first pin, 1.5v on middle pin, and ground on 3rd pin.
I expected both of these to see 5v, considering RealOEM lists the same part# for both sensors. I do not have continuity between any of the 3 pins on either plug, and only the 3rd pin checks continuous to ground. Voltage was checked with key on. Continuity between pins checked with key off.
I do have 2 new sensors on the way, but trying to further troubleshoot in the mean time.
Question:
Does anyone know for sure what voltage each of these is supposed to have coming from the DME? I would like to know for sure they both are supposed to have 5v with key on, before I go removing a harness, to hunt for a bad wire.
Thanks!
1986 325e All stock
Found 2 bad fuel pumps, so I converted to a single high pressure in tank pump.
Once I had fuel, I just knew it would start.... no dice. I had no spark now either.
I went through all the Bentley manual's ignition diagnostics.
Installed New spark Plugs (someone had platinums in it)
Coil checks good.
No Ground signal coming from DME to fire the coil. (Checked with test light)
Found 1 blown fuse, (interior lighting etc)
Replaced fuse, checked all relays (good)
Unplugged both engine speed and pulse sensors, and both checked good with Ohm meter. (plugs are very brittle on sensor side and started cracking apart) Plugged back in, and checked for Ground signal at coil. We have a flashing test light now!!!
The old girls starts up, though rough. I was thinking that a couple of injectors were stuck, because after letting it run for a few minutes, getting it up to temperature, and giving it some RPM off and on, everything cleared up for the most part. I took it for a quick spin up the road and back, and all seemed good. I shut it off, so I could tie up some loose ends and put little stuff back together in the fuel pump area. Start it up again, to move it into the shop. Now its firing on about 3 cylinders sounds like. Run out of time.
Come back that night, and won't start at all. Sounds like 1 cylinder is firing way late through exhaust or something. Loud ticking once per engine revolution.(estimate) Throw hands up and go to bed.
Current Status:
Back to having no gound signal to fire the coil. Although the loud ticking when cranking has stopped also.
Double checking Crank sensors. Both ohm out within spec.
Decided to check voltage coming to these sensors. One of the plugs, I get 5v on the first pin, a few mV on middle pin and ground on 3rd pin. (seems right) The second plug however, I have 1.5v on first pin, 1.5v on middle pin, and ground on 3rd pin.
I expected both of these to see 5v, considering RealOEM lists the same part# for both sensors. I do not have continuity between any of the 3 pins on either plug, and only the 3rd pin checks continuous to ground. Voltage was checked with key on. Continuity between pins checked with key off.
I do have 2 new sensors on the way, but trying to further troubleshoot in the mean time.
Question:
Does anyone know for sure what voltage each of these is supposed to have coming from the DME? I would like to know for sure they both are supposed to have 5v with key on, before I go removing a harness, to hunt for a bad wire.
Thanks!
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