Losing Boost

[DocBoom]

This is my situation, maybe someone can lend some advice.

I have a 3.5MSP. I have been noticing a drop in my boost level...it now appears that I'm only hitting 4psi. This is after:

1) I changed the vacuum lines about 6-8 weeks ago. I did not note a loss in boost at that time. I will admit however that the lines behind the motor maybe off by a fraction of an inch. I have two different size silicon hoses and I think think that I may have got a little mixed up when I was cutting and putting them on. They all went on fitting tight and without too much effort. Aswell they are all clamped.

2) Replaced tires 2-3 weeks ago. Pirelli 210 Snowsport 195/60/15. (Lots of fun!)

3) Winter came and has been significantly below zero since I bought the tires...a day before even...I am an occasional procrastinator.(drunk)

I have also noticed a significant increase in gas mileage (which IS much appeciated)...and no, this is not due to speed reduction because of the bad weather

I am just wondering if this is normal or am I going back to the dealership yet again.

oh...no MBC on the car at current time... fuel cut

(msptitani

 

[DiscreetSpeed]

id check for a leak, but what is your normal boost?....and is it steady at 4psi?

 

[DocBoom]

generally runs at about 5-6 now it is 3-4.

I will check for leaks, but I really doubt that there are any, I was quite careful putting them on (with exception of the slight size discrepency of course. I was more suspicious of the cold as this was when I first noticed it. Does cold weather do this sort of thing? even after hour long drives?

 

[Black Majik MSP]

Why did you post this twice?

 

[DocBoom]

Crappy mouse. double clicked. Don't know how to remove the double post

 

[MSPDAVE125]

What kind of boost gauge are you running?

Check to see if the vac line to your gauge is not crimped.

Does the car "feel" slower?

 

[DocBoom]

well that is the thing I'm not sure if it really does feel slower, or if I have just become velocitized....I will check that vac line though...it is a distinct possibily...was fitting the pillar about a couple days prior....crossing fingers.

Thanks...

 

[igdrasil]

theres a BIG difference when running 3psi vs 6psi.
You may have a leak on the boost gauge line or is hooked up wrong