What should vacuum be at idle?

[DChan415]

Does anyone know what vacuum should be at idle?

I'm getting 14 inches at 700 rpm. Sounds low to me...

 

[FRANK]

Does anyone know what vacuum should be at idle?

I'm getting 14 inches at 700 rpm. Sounds low to me...

If it is a stock motor usually somewhere between 17-22" is the norm. You may have a slight vacuum leak somewhere. Is the car running good? You can always spray carb cleaner around the intake ports to see.

 

[Jack B]

The acceptable range is 16-22" Hg

 

[FRANK]

Put it this way...anything less than 17" of vacuum on a stock engine would be somewhat of a concern for me...I've had many stock motors pull 20"-22"...must I go check my vacuum gauge to see where the green area ends lol?

 

[DChan415]

I thought 14 was low, but... I figured maybe the uneven firing v10 has different vacuum specs.. the car runs good and passed california enhanced emissions test a few weeks ago.

I will go check for vacuum leaks

 

[Tomer]

Danny, where are you measuring this?

Tomer

 

[FRANK]

Spray some carb cleaner around the intake ports...if the idle rpm goes up...you have just found your vacuum leak. Personally I don't think vacuum specs on a V-10 would be ANY different than on a 4 ******...