Surging Problem - Help

[Lawless]

Originally posted by moosejaw:
This a challenging problem.
I have some questions 1st. Do you have a blower bypass valve and is its connections to blower inlet anywhere near the air meter.

This kinda sounds like the bypass valve cycling open and shut at low load causing flow disruptions. If vortech shipped the Bosch bypass with your kit this could be the culprit. Adjustable bypasses are easier to setup for different cams.

To test this pull the vacuum line from the bypass and plug it. Drive the car with low to part throttle (no boost) and see what happens. It will idle funny with the bypass undone because the blower will push more air past the throttle blade. Look for that lean out condition while driving and don't rev it high with out the bypass!! The blower belt could jump off when you shut the throttle.

Hey PKRWUD lets see if we can get this one solved quickly.

Mike

Mike and Chris,

The MAF is located inside the passenger fender, it is mounted to a homemade power tube (not bad quality) from the back of the Vortech.

The racing bypass (HKS) is located in the tube that connects the Vortech to the throttle body. The top vacuum port is connected to manifold vacuum. The bottom port isn't connected to anything, also on the bottom is a adjustment bolt. I called HKS and they said the bottom port and adjuster bolt to limit your boost. I left it alone. The factory wiring harness was lengthened poorly (to relocate the maf to the fender) so I rewired it with the correct guage and properly soldered it up. I unbolted the sensor and cleaned the two wires.

I reinstalled it and tested it. No difference. The sensor is engraved to show it is recalibrated for the 36lb injectors.

I replaced both 02 sensors with Bosch, no difference. I received my new pressure regulator but havent had time to install it. I don't think that is the problem. The factory one is pushing 42 psi.

I will unplug the bypass valve (like you suggested) although I think I tried that already.

I hooked up a Snap On scanner, there were no codes. No trouble lights come on the dash ever.

The blower is run by a cog belt system.

The rich lean indicator does not register at idle, when you rpm it, the colors are all good. When the car surges..... most of the time the indicator is not registering.

Questions: Have you guys heard of Pro-Flo ?, (that is the brand of the maf). I am concerned about that.

Could the cam be to radical ? That's what the previous owner said. I am not sure on that one.

Any other suggestions ?

Thanks for your time.

Jay