Help! only getting 3-5 psi!!!

[urabusturbo]

I just got a 94 touring wagon for dirt cheap and have changed all the fluids, added a k&n, and installed a boost gauge. I have been getting around 5 psi and sometimes less. i have checked all the vaccume lines and tried several methods to get it back to its stock level. i do have a CEL with codes 35 and 49, Canister purge solenoid valve, and MAF. could these be the reason or am i overlooking something obvious?

[Legacy777]

It's possible the MAF sensor could be causing it....but are you sure you have hoses connected properly to the wastegate solenoid?

[urabusturbo]

i swapped on my maf from my other t-leg and all the hoses look fine, i cut a small hole int he wastegate line and was gettiing close to 9 psi but then the fuel cutout issue was happening

[Binford]

Where did you tap into for the boost gauge? You may not have a correct boost reference.

[rallysam]

I'd be worried that your boost gauge is wrong before you start doing stuff like punching holes to raise boost. Hook up a laptop with the BC-BF scan tool, or borrow a friend's boost gauge.

I had an autometer boost guage that read 5-7 psi. I kept turning up the boost, and over time the reading kept sagging back down. Eventually I started hitting fuel cut. It turned out I actually was hitting 13-14 psi and the boost gauge was just crap. Good thing I didn't have an FCD installed yet.

Also, tell us where the gauge taps off.
Also, push on the wastegate lever and confirm that it moves and springs back.

[urabusturbo]

i hooked up the boost gauge off of the line coming out the manifold and i have another boost guage i can try, im using an old autometer that has been in a few cars, i'll hook the other one up after work and see what happens. The car fells slower than it should, and according to my g-meter im not pulling as strong as my last t-leg. does the computer lower boost if a CEL is on?

[free5ty1e]

Yes, especially when it detects regular and not premium gasoline... at which point you'll get wastegate boost, about 5-6psi

[urabusturbo]

seems like you all were rite, after re-checking the boost gauge, emptying the tank of gas that came with the car and filling premium, and re-doing all the vaccume lines, ect, the car is boosting to normal levels, it rained today and i am enjoying sideways conditions again finally , i bought a can of seafoam he other day, where should i add that stuff?