brogers at terrix.com
Tue Mar 21 11:26:27 EST 2006
my motor seems to be idling a little rough these days -
Idle speed is just over 750 rpm. First I thought maybe it was a slight vacuum leak - haven't ruled it out yet - but the ECU has no stored codes. I did pressure test the system not too long ago and found no leaks. Also vaccum at cold idle was only about 9psi yesterday - usually it is closer to 11 -12. Forgot to check again today. FWIW temps are cold now - single digits and teens and my oil is old by my standards (but maybe not be some other people's, ahem) - M1 w/ about 7000 mi +/- (includes a 4500 mi highway roadtrip). Warm idle vacuum is about 12 psi. Was about 12-13+ psi vacuum last I remember....
so lower vaccum at idle would indicate a small leak - I'll have to see if this was just due to extra cold..??? When I go to lunch I'll try to remember to look at idle vacuum at cold start.
So maybe there is a very small tear in a hose - any other ideas? How much vacuum should there be at idle? I know this is difficult to answer for many of you do to that awesome digital boost gauge...
Also - the motor does seem to be performing on par.
Any other thoughts? Any input appreciated-
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