Can ignition system affect vacuum?

[habitatguy187]

Searched and didn't find anything, but my question is....

Is there anything in the ignition/fuel system that can affect vacuum at idle? Because I have had a vac of -16 ever since I've had my car and I've done so many boost leak tests with so much soapy water and even a smoke machine. I'm so stumped.

So is there anything else besides a leak that can affect vacuum?

BTW my car idles like crap on hot starts. (coil packs maybe)

 

[hubz91talontsi]

-16 vac is fine...Nothing wrong is that. The vacuum depends on 2 things. How strong your motor is, and how high above sea level you are. I have -20 with a motor that has less then 500 miles. If it idles like crap its your throttle body. The TPS and ISC in 1g's all go bad. Which will cause the car to jump around only at idle. Correct? I hope this helps ya out

 

[habitatguy187]

Could you explain what you mean by, "how strong your motor is"? And is it the higher above sea level you are the lower the vac? Thanks

 

[hubz91talontsi]

How many miles are on the motor? Do you live in the mountians...come on man. If you live in the mountians the air is going to be thinner

 

[habitatguy187]

125,000 miles and no I live in Indianapolis IN.

 

[hubz91talontsi]

When i had 150k i was around on -16 so your fine. Find a new TB