I recently got a Service Engine Soon light and had to clean my MAF sensor. The car runs strong once again, however the Boost PSI gauge sits just left of center (0) at idle.
I thought it used to go all the weay down to -10 at idle.
I does still rise up to right of center (0) as I accelerate.
Does anyone know where the BOOST PSI gauge should sit while at idle speed.
Thanks
BOOST PSI gauge
BOOST PSI gauge
Last edited by David CO on Sat May 30, 2009 4:21 pm, edited 1 time in total.
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viper8907
- Posts like an L36
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Re: BOOST PSI gauge
my aeroforce indicates around -19 psi. As far as I know thats normal.
-Tom
2003 Silverado Ext. Cab - Charcoal - 128,000 miles - Stock...for now.
2000 SSEi - Gone, but not forgotten.
2003 Silverado Ext. Cab - Charcoal - 128,000 miles - Stock...for now.
2000 SSEi - Gone, but not forgotten.
-
J Wikoff
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- Posts: 17080
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- Year and Trim: 1992 SSE
2009 G8 GT - Location: Central Illinois
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Re: BOOST PSI gauge
It should sit well into the negative range. If you get full boost at WOT, I'd look for a vacuum leak somewhere in the BCA or BCS and surrounding lines.
The BCA is the boost control actuator. It's the black cylinder with an arm coming out the bottom, on the front side of the engine, near the throttle body, with the arm connected to a rod coming out of the supercharger.
The BCS is the boost control solenoid. It's a little black box right close to the BCA with wires running to one side, and a short vacuum line running to the bottom of the BCA.
Unplug the wires to the BCS, and see if the idle vacuum changes. If it does, there's likely something wrong with the BCS. If it doesn't, pull the vacuum line between the BCA and BCS off the bottom of the BCA. If the idle vacuum still doesn't change, there's something wrong with the BCA or the nearby vacuum lines. Listen for hissing, that would be vacuum leaks.
The BCA is the boost control actuator. It's the black cylinder with an arm coming out the bottom, on the front side of the engine, near the throttle body, with the arm connected to a rod coming out of the supercharger.
The BCS is the boost control solenoid. It's a little black box right close to the BCA with wires running to one side, and a short vacuum line running to the bottom of the BCA.
Unplug the wires to the BCS, and see if the idle vacuum changes. If it does, there's likely something wrong with the BCS. If it doesn't, pull the vacuum line between the BCA and BCS off the bottom of the BCA. If the idle vacuum still doesn't change, there's something wrong with the BCA or the nearby vacuum lines. Listen for hissing, that would be vacuum leaks.
Last edited by J Wikoff on Sat May 30, 2009 5:25 pm, edited 1 time in total.
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Re: BOOST PSI gauge
Much easier to understand..thanks
Re: BOOST PSI gauge
Wow you guys are impressive. BCA looks fine, moving to the BCS is a different story the hard plastic hose coming off of the left side and running across the front of the engine is broken at the BCS connection as well as the opposite end of the line where is enters the engine again.
In all honesty I may have cracked the line on the end near the BCS as I was replacing my valve cover gaskets.
So what is this line called? I believe it is in two parts as it 'T's off at one point.
It looks like an easy fix and I can get my vacuums back in order.
ANSWER
The Part is called a Supercharge Boost Harness. GM Part #24508742, cost me $23.90
In all honesty I may have cracked the line on the end near the BCS as I was replacing my valve cover gaskets.
So what is this line called? I believe it is in two parts as it 'T's off at one point.
It looks like an easy fix and I can get my vacuums back in order.
ANSWER
The Part is called a Supercharge Boost Harness. GM Part #24508742, cost me $23.90
Last edited by David CO on Wed Jun 03, 2009 9:42 pm, edited 1 time in total.