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E34 M5 (1988-1995)

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  #1  
Old 04-07-2013, 07:02 PM
4heid 4heid is offline
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Mein Auto: E34 M5
Ignition coil wire readings

I have recently purchased a 91 M5 and am beginning the process of review for restoration.

1.
Recently, the idle seemed less than idle. I can here it studder but its not visible in the tach and now its holding idle at about 600rpm which I know is a little low.

This evening I took some readings from my plug wires after replacing the plugs.

They were from 5.68 to 6.35 k ohm on the spark plug wires, end to end but the Ignition coil wire, that which runs from the ignition coil to the distributor showed 2.186 k ohm.

Is there any reason this cable should show less than the others which are in spec as per the Bentley manual? I cant seem to find where this wire has another indicated range.

could anyone verify?

2.
I removed the plenum and cleaned the ICV which was quite dirty but it had no effect on the studdering idle.

I have not yet replaced or checked the distributor but perhaps its an area of issue also. I did check the valve actuator and it at no times performs the self-test thus I have to assume the electric valve that actuates it is not working, could this be an issue related to idle also?


3. I just watched the idle again and noticed that if I activate the A/C, the idle issues significantly better themselves. Its not perfect but its uniform and not lumpy and studdering. once the A/C is shut off it begins again.
thanks,
chris

Last edited by 4heid; 04-13-2013 at 04:54 PM. Reason: more info
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  #2  
Old 04-13-2013, 04:35 PM
4heid 4heid is offline
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  #3  
Old 04-14-2013, 05:02 PM
4heid 4heid is offline
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"TPS readings"

Pin 1-2 = 3.67kohm, always steady, throttle position makes no difference in reading
Pin 1-3 throttle closed = 3.12 kohm
Pin 1-3 throttle half = approx 2kohms and moves with each movement of the throttle
Pin 1-3 full throttle = 352ohms, this is the bottom

Is it not the case that the resistance increases as the throttle is opened? My readings have no relation to those I have found online which sate 2kohm closed, 2-10khm as the throttle moves and 10kohm full throttle.

Pins 4-5-6 show no readings.
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  #4  
Old 04-15-2013, 07:45 PM
4heid 4heid is offline
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Mein Auto: E34 M5
Throttle position sensor update

pins at 10 and 2 o'clock - 0 to 1.2mV (closed to WOT)
pins at 10 and 12 o'clock - 1mv steady

thoughts?
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  #5  
Old 04-18-2013, 04:46 AM
4heid 4heid is offline
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Location: Miami
 
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Mein Auto: E34 M5
I replaced the distributor and rotor and it seems it was the major culprit. There is still some random studder but its much better now.
I am still unsure of my TPS readings as to whether its on its way out or not.
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