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E36 General discussion and technical help for (E36) 1992-1999 3 series cars. 318, 323, 325, 328.

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Unread 07-25-2009, 04:03 AM   #1

Name: Serge
Title: United Newb
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Location: Australia
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Your Ride: 318is
Exclamation Please Help me and My 318is overheating and very low idle

I have made too many posts and I apologise from now on I will stick to only this one, firstly I have replaced head gasket, all gaskets, seals, etc.. I put her all back together and I am overheating, I compression tested the engine and she is very healthy sitting at 180psi on all 4 cylinders.

I have tried 2 different thermostats, 2 water pumps, I have bled the system so much that there is barely any coolant left in the system as the water has overcome it. The engine seems to warm up very quickly from cold say approx 4 mins? I have bled the system accordingly including draining rad and block many times

Here is a list of all the items I have replaced

1. All vacuum and rubber fuel hoses
2. All gaskets intake, exhaust, head gasket, timing case profile gasket, valve cover gasket you name it I replaced it.
3. All coolant and radiator hoses
4. Oxygen sensor
5. Throttle Position Sensor
6. Spark plugs
7. Ignition Leads
6. All pulleys
7. All belts
8. Fuel/ Oil/ Air filter
9. Coolant Temperature Sensor (still have issue will get to that)
10. Coolant temperature sending senso (to cluster)
11. Knock sensors x2

The head was machined and pressure tested without any dramas.

Only three concerns are

1. The overheating
2. Very low bumpy idle at approximately 400- 600rpm (nearly stalls
3. Peake Research tool throwing up coolant temp sensor fault

The car is a 1993 318is M42 4Spd Auto.

All the parts are genuine BMW purchased from Pelican parts (cost me an arm and a leg)

There are no other fault codes apart from the coolant temp sensor error, which I figure must be a short or ground within the engine harness, I will get onto that.

What symptoms would arise from coolant temp sensor? bad idle?

She seems to have a slight miss, I will replace the coil pack and new fan clutch and report back...

Any help from anybody would be very highly appreciated as I'm running out of clues, patience and money. Serge
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Unread 07-25-2009, 11:01 AM   #2
Big Evil
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Name: Big Evil
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Location: Tempe, Az
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Your Ride: 1994 BMW 525i, 1987 325is, 1986 325
Sounds like the wiring to/from the sensor may be at fault. If its grounding out or shorted to pwr it could cause what you're describing. Since you've done everything else that's where I'd focus and see what happens
Big Evil, The BMW driving monster of the American Southwest (Currently on BMW #5)
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Unread 03-10-2010, 08:38 PM   #3

Name: Ricardo567
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Your Ride: 1994 E325IC
Hello community, I am new here. I have had 325IC convertible 1994.
I got some video about my Idle components under intake manifold to share.

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