i have a 95 riviera w/a 3800sc i have installed a 2.3" pulley and im making only 9psi boost. with the 2.55" i made 7psi boost. my car is stockexcept for CAI and removed cat,resinator, and installed dual flowmasters. why am i limited to only 9psi on a 89 degree day. and when i make full boost i get a slight hesitation like it needs more fuel. could it be from KR. i got factory platinum plugs which are new and new wires. i replaced the coupler in the sc. [/b]

Ummmm have you ever scanned for KR? if not DO IT NOW!

Also if you have not gotten a smaller belt or a bigger Tensioner Pulley then you most likely are getting belt slip at the higher RPMS

Platinum plugs are a HUGE no no. My car had them when I purchased it and it had nowhere near the performance it should of.

Are you running a larger tensioner pulley? What about the marks on the tensioner? where is the arrow on the scale?

What about vaccum leaks, have you checked all the lines?

And finally, a 2.3 is pretty small for a Gen 3 M62, have you scanned for KR?

no i havent scanned for KR. the tentsioner is all the way extended i am gonna put a new tentsioner and smaller belt

The very first thing you need to do is scan for KR. you can & will you engine if you are getting a lot of KR.

how would KR cause low boost?

The PCM would dump boost. Pull the vac line off the bottom of the BCA. If you get more boost, the PCM is dumping boost or the BCS is going bad. If you don't get more boost, check for vacuum leaks in the BCA or line leading to it.

And remember to put the bottom line back on the BCA when you're done. It may be protecting you engine for a good reason.

do i need to also upgrade to 255lph pump and 36lb injectors from a series 2 or 3. and where can i get a pcm upgrade for my car.what type of scanner do i need to hook up to my car to check kr. i have the obd2 connector but not obd2 program.

Don't go throwing tons of fuel at it till you know what'* going on. You need a scan tool capable of OBD 1.5 and I don't have any experience with 1.5.

One of these scan tools work very nice

http://cgi.ebay.com/ebaymotors/ws/eB...138689108&rd=1


and then your going to need one of these cables from one of th members on here

http://i114.photobucket.com/albums/n...old/CABLE3.jpg

Members name is : Slug

Just PM him.