Off Boost and Throttle, RPM Spike While Shifting, Help?

[desant78]

Hello gvr4.org

Driving around work I noticed that I have a mini "rpm spike" of about 500 rpm, depending on boost, throttle position, and gear.

For instance, if I am in the 4-5.5k rpm range, in second gear, at about a litte less than half throttle, at 10 psi, and try to shift, I get a spike of 500 rpm.

If I just get off the throttle gently, and don't shift nothing happens. Also if I get off the throttle and wait for the BOV to stop, then shift nothing happens.

If I am shifting while my BOV is making any noise, I get an RPM spike. It varies, and I will post a video. I just noticed this today, and added the MBC last night.

Any suggestions?


Thanks in advance! I'll try and post a video tonight.

 

[xaisomboun]

Sounds like a sticky throttle cable or something..

 

[EfiniX]

Isn't this also a symptom of running a bit lean?

How's your engine temp?

 

[DynastyLCD]

learn how to drive /ubbthreads/images/graemlins/devil.gif




just kidding, Sal!

 

[boosted_85]

I have the same problem but my happens around 3k instead of 4-5.5k range. I have changed ignition coils, wires, plugs and ignition tranisistor and the problem still exist. Whats weird is that it doesn't show in any of my logs, must be bad wiring somewhere or something.