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My E30 Updates

#1 User is offline   Gavlin Icon

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Posted 22 May 2017 - 09:40 AM

Hi Guys,

So its been a while since i did an update so here goes:
I received my e30 last year car was driving but had a starting issue, it is a 320 with 325 crank gas flowed head and the block was bored.
Decided after checking the car out the root problem seemed to be the AFM and ICV, but that been said swapped in ones that are known to be working and car still didn't start.
Started stripping and the starter was botched, had to replace that, then the radiator pipes, thermostat, fuel pump, fan motor and blades, exhaust manifold, exhaust, breaks, cleaned out the pipes, cam belt, new AFM boot, and a general good on service.
put on the known working AFM and ICV and she was alive, driving like a dream...
car was parked for a few weeks as work took priority... and yesterday decided i wanted to take her for a drive and... no start...
spent almost an hour trying to start her up but nothing, engine never even get warm, so i put it down to either the O2 sensor or cold start issue.
so my question is, do you think management system will fix this issue or is there another underlining problem?
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#2 User is offline   MYBRIDH Icon

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Posted 22 May 2017 - 09:04 PM

My thinking is that if it has gone from..... driving like a dream.... to not starting, it is very likely that it could be an issue that could be resolved.

I think you should keep troubleshooting and determine what it is that is preventing startup.

I would start by checking that spark is getting to the plugs.
Check that there is fuel pressure.
Check that the injectors are pulsing.

If you have all that then start delving into finer details like cold start, timing etc.

It could be an underlying problem that wont be resolved by management in which case you may end up still needing to troubleshoot to find the problem before you get it running with a management system.

Later
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#3 User is offline   Gavlin Icon

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Posted 23 May 2017 - 09:06 AM

thanks for the feedback, i will check those items out, i know it is getting spark and there is fuel pressure, would need to check the injectors.
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#4 User is offline   Gavlin Icon

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Posted 24 May 2017 - 09:12 AM

So fiddling with the car yesterday, it cranks but does not turn over.
Checked the battery and it is also fine, so not sure what to check next.
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#5 User is offline   MYBRIDH Icon

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Posted 24 May 2017 - 09:21 AM

Gavlin, what do you mean Cranks but does not turn over? (those mean the same thing as best I know)

If you mean that you can hear the starter motor run when trying to start but the motor itself is not turning, it is likely that the starter is not engaging the flywheel. If this is what is happening it may be that the solenoid is the culprit.
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#6 User is offline   Gavlin Icon

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Posted 25 May 2017 - 08:54 AM

Sorry for not been clear, i mean the engine cranks, but does not start.
i can hold the key for as long as i wanted the engine only cranks but just won't start, i checked fuel, sparks, fuel pressure.
from reading a few posts on the form, i see a few people had the same problem which turned out to be the C191 multi plug?
didn't have time to check mine yet but do you think that could be the problem?
they also say a crank sensor but I'm not sure how to test that.

Note that this only started happening after the day of rain that we had.
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#7 User is offline   MYBRIDH Icon

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Posted 25 May 2017 - 09:59 AM

From e30ZoneWiki

"The C191 is a connector on the engine loom of Motronic 1.3 cars. It allows you to disconnect the wiring to the fuel injectors without having to remove the entire loom.
It is located underneath the intake manifold, and is a known water trap. The resulting corrosion of the wires leads to mis-fuelling, either to failure of the injectors or lack of data from the temperature sensor to the ECU"

Certainly sounds like a good place to continue your troubleshooting. If you have spark, and fuel pressure, checking injectors pulsing would be a good next step.
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#8 User is offline   Gavlin Icon

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Posted 25 May 2017 - 11:09 AM

awesome, thank you for the assistance, will check those out today and update
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#9 User is offline   Gavlin Icon

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Posted 26 May 2017 - 04:48 PM

so after checking the C191 it seems that it is fine, removed it there was no corrosion, i also removed the crank sensor, there was a cut in the wire and a dent on the sensor. going to replace that and hopefully that solves the problem.

This post has been edited by Gavlin: 26 May 2017 - 04:48 PM

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#10 User is offline   MYBRIDH Icon

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Posted 26 May 2017 - 09:18 PM

Best of luck.
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#11 User is offline   Gavlin Icon

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Posted 29 May 2017 - 09:36 AM

so i changed the crank sensor, and still no luck.
so i went back to square 1 and re tested everything, i have spark, battery is good, checked power to the fuel pump and i see that is no power.
Check the fuse and that is fine, so checked the relay and seems like that is where the problem is.
not sure how i missed that the first time.

and then i go and do something very silly, i got my hands on another relay that seemed to be the same, plugged it in i think i may have shorted my ECU!!!(that is what happens when you work late at night tired and try to rush things)
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#12 User is offline   MYBRIDH Icon

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Posted 29 May 2017 - 12:40 PM

Oh nooooo........I have got a similar T-Shirt.

I could not tell you which pins, but there are two pins you could connect together on the connector that effectively bypass the relay (mimic its contacts) to power the pump.

You could try that to test the pump and conform which of the relay or pump are faulty.

Fingers crossed that you have not damaged the ecu.

Good luck man.
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#13 User is offline   Gavlin Icon

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Posted 29 May 2017 - 02:59 PM

Thanks MyBridh.
me being a noob at this stuff is likely why I'm making these silly mistakes, i have downloaded a guide on how to test that the ECU is still okay, will hopefully check that today (fingers crossed its okay), are there any other fuses that i need to check, the only ones i can see are the ones in the engine bay, in the main fuse box, are there any other ones that you can think of, as i am getting nothing on the inside, no lights no ignition no cluster lights, and does not crank anymore.
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#14 User is offline   Quintt Icon

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Posted 29 May 2017 - 07:19 PM

View PostGavlin, on 29 May 2017 - 02:59 PM, said:

Thanks MyBridh.
me being a noob at this stuff is likely why I'm making these silly mistakes, i have downloaded a guide on how to test that the ECU is still okay, will hopefully check that today (fingers crossed its okay), are there any other fuses that i need to check, the only ones i can see are the ones in the engine bay, in the main fuse box, are there any other ones that you can think of, as i am getting nothing on the inside, no lights no ignition no cluster lights, and does not crank anymore.


Relay wires normally are pin 30 is batt positive pin 85 is batt negative pin 86 is signal in like signal from ecu and pin 87 is signal out. Wire to feul pump so if u bridge 86 and 87 pump should work
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#15 User is offline   bmwmaniac Icon

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Posted 29 May 2017 - 07:31 PM

View PostQuintt, on 29 May 2017 - 07:19 PM, said:

Relay wires normally are pin 30 is batt positive pin 85 is batt negative pin 86 is signal in like signal from ecu and pin 87 is signal out. Wire to feul pump so if u bridge 86 and 87 pump should work

thats the quickest way to pop the ECU
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#16 User is offline   Gavlin Icon

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Posted 29 May 2017 - 08:19 PM

Thanks @Quintt.
I tried that yesterday which is how I fried the ecu.
Maybe I did something incorrecto. Or maybe there was already a fault... not sure.

So I found a guide online for checking the different connectionstyles for the ecu and the fuel relay is not working. And also I may have fried my ecu.
Next would be to open the ecu to check if there are any wires burnt.
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#17 User is offline   MYBRIDH Icon

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Posted 29 May 2017 - 08:48 PM

View PostGavlin, on 29 May 2017 - 02:59 PM, said:

....... i am getting nothing on the inside, no lights no ignition no cluster lights, and does not crank anymore.


Can't tell you off the top of my head but sounds like a main 12v supply is not getting where it should.

I would imagine that even with the ecu unplugged you should still get lights and cluster etc.

Don't rule out the ignition switch. Check for power at the switch and any main fuses or relays that supply the ignition switch or fuse box.

Wish I could be more specific but my knowledge of e30 is not at that level.
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#18 User is offline   Quintt Icon

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Posted 30 May 2017 - 06:42 AM

View Postbmwmaniac, on 29 May 2017 - 07:31 PM, said:

thats the quickest way to pop the ECU


I have done that many times and not once have i fried an ecu. And dnt think u will fry an ecu that quick.... iy has protection circuits. Just gotta be carefull.
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#19 User is offline   Quintt Icon

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Posted 30 May 2017 - 06:44 AM

View PostGavlin, on 29 May 2017 - 08:19 PM, said:

Thanks @Quintt.
I tried that yesterday which is how I fried the ecu.
Maybe I did something incorrecto. Or maybe there was already a fault... not sure.

So I found a guide online for checking the different connectionstyles for the ecu and the fuel relay is not working. And also I may have fried my ecu.
Next would be to open the ecu to check if there are any wires burnt.


If there is no power at all on cluster i would check all the fuses aswell as the power relay on car. Are you anywhere near alberton? If so look me uo and i might be able to assist in fault finding
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#20 User is offline   Gavlin Icon

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Posted 30 May 2017 - 08:51 AM

View PostQuintt, on 30 May 2017 - 06:44 AM, said:

If there is no power at all on cluster i would check all the fuses aswell as the power relay on car. Are you anywhere near alberton? If so look me uo and i might be able to assist in fault finding


No i am in cape town :(
Yesterday i decided to do the wire checks as mentioned and yes now i am getting cluster lights and ignition, but when i plug the ECU in i do not get anything, is there a fuse for the ECU or a relay for the ECU that i can check?
I have checked the fuses already and all of them are working, the main relay(the one next to the fuel relay) is working. the ECU connection wire, i checked for ground, live ignition etc and all are working, have i missed something?
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