High Idle on Disco 2

**Redback** · 19th June 2007, 06:54 AM

The idle on the Disco is now nearly 1000rpm it has also developed a whistle that sounds like the turbo whistle, now from my experience with motorcycles when an engine starts idling high, it's usually sucking in extra air (ie) running lean, 2 stroke engines aspecially do this.

Any thoughts and could the whistle sound be the sucking of air in, it is only apparent when the engine is at full running temp.

I was thinking the broken exhaust studs again but this is different, the idle was never effected by the broken studs.

Baz.

**ladas** · 19th June 2007, 09:18 AM

Baz, I have heard of a few occasions where the engine coolant sensor has failed causing this.

Apparently the fault make the 'brain' think the engine is cold and increases the fuel etc., like applying and automatic choke.

Or fuel temp sensor

Don't know about the whistle.

**Redback** · 19th June 2007, 10:30 AM

OK thanks Ladas, i had another thing mentioned too of an oil leak from the intercooler hose causing this, is this possible?

Baz.

**ladas** · 19th June 2007, 11:27 AM

Originally Posted by Redback

OK thanks Ladas, i had another thing mentioned too of an oil leak from the intercooler hose causing this, is this possible?

Baz.

Sorry Baz, but my knowledge on turbo's/intercoolers is minimal - to say the least

The sensors are easy to test if you have a meter

The fuel temp sensor AND the Engine Coolant Temp Sensors should read

(Yep both have the same resistance at the same temp)

Temp C------------- ohms

-10 ----------------9397
0 ------------------5896
10 -----------------3792
20 -----------------2500
30 -----------------1707
40 -----------------1175
50 ------------------834
60 ------------------595.5
80 ------------------322.5
100 -----------------186.6
125 -----------------100.2

Obviously if either sensor is open circuit it is faulty

**Redback** · 19th June 2007, 12:33 PM

Thanks Ladas, i'll check that too.

**Redback** · 20th June 2007, 02:37 PM

Problem solved Ladas, it's the bloody exhaust manifold studs again

Had a good look over the car and found the black soot up the front of the manifold, guess i'm going to be an expert with this now, after we come back from the Flinders it's the upgrade to the 10mm studs.

Baz.

**ladas** · 20th June 2007, 05:21 PM

Good, nice simple repair.

**discowhite** · 20th June 2007, 06:55 PM

after we come back from the Flinders it's the upgrade to the 10mm studs.

Baz.

or fit an egt gauge and monitor what its doing while you are towing,
then throw that bloody BD chip out the window!

problem solvered....

cheers phil

**Redback** · 20th June 2007, 08:00 PM

Originally Posted by discowhite

or fit an egt gauge and monitor what its doing while you are towing,
then throw that bloody BD chip out the window!

problem solvered....

cheers phil

The power Phil, it's the power

Could well be the cause and yes a egt gauge is on the cards, as well as an intercooler to bring the exhaust temp down, gotta find out the temp to see if the chip is causing the studs too break.

So many things too do, so little money

90s looking good

Baz.

**discowhite** · 21st June 2007, 03:46 PM

just rember that the more you get the manifold decked the thinner it gets. that should make the expanding and contracting of it quite rapid.
and it will get brittle too.

cheers phil

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