[urq] Engine Warmup Operation

[Rick Petrow]

	Thanks for the feedback as this gives me confirmation of the range
to look for. 

	Over the balmy weekend I removed the aux air valve to check the cold
vs hot positions of the internal sliding valve. Seems that after cooling
down the valve in the freezer to simulate a cold start air flow was
restricted and probably resulted in a very rich mixture. Adjusted the pivot
pin to allow more air flow & reinstalled back on the engine. Next morning
the car idled nicely @ ~1000 RPM and seemed to behave OK on light loads. 

	Thanks again for the cold weather info.
	

	

 	  

-----Original Message-----
From: Louis-Alain Richard [mailto:laraa at sympatico.ca] 
Sent: Monday, January 30, 2006 11:27 AM
To: 'rpetrow'; 'Brandon Rogers'; urq at audifans.com
Subject: RE : [urq] Engine Warmup Operation



>    I take it that the idle speed should be constant during warmup, say
> somewhere between 850 & 1000 RPM? 

On my stock WX, that is correct. Exterior temperature can be as low as -15C
or as high as +30C, startup idle speed is always the same.

It doesn't ramp up to ~1500 for a short
> period like most EFI systems and then drop back to 850?

No. However, I found that the idle speed is not perfectly stable. If the
engine is very hot, idle speed will go up a bit for a few minutes. It seems
to be temperature related (underhood temperature, that is). 

Louis-Alain
Montreal