# B18C Build Troubleshooting **URL:** \ **Category:** PittSpeed Automotive\ **Created:** [April 9, 2008, 5:37am UTC](https://forums.speedlife.net/t/b18c-build-troubleshooting/196698 "2008-04-09T05:37:33Z")\ **Posts on this page:** 1\ **Showing post:** 63
**Author:** ![dyingwish](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/dyingwish/32/6041_2.png) [@dyingwish](https://forums.speedlife.net/u/dyingwish)\ **Post date:** [April 15, 2008, 7:45am UTC](https://forums.speedlife.net/t/b18c-build-troubleshooting/196698/63 "2008-04-15T07:45:08Z")
> [@hey guess im a newb around here, some pics.](https://forums.speedlife.net/t/hey-guess-im-a-newb-around-here-some-pics/35945/11): > > Are you 100% positive there are no adjustment screws, that will close off the bypass holes? If they are indeed just a passage from one side of the plates to the other you could just pull off the ITB’s and pack the holes with JB weld and then smooth them off once cured. > > Sounds like the TPS is shot or else the loose wire problem you reported previously is not correctly fixed. Also, I would be sure to check your input voltage and your output from the TPS with a multimeter to be sure of the values and not some odd problem with your modified ecu set-up. > > Could you please clarify the changes in MAP pressure? Are you seeing more vacuum initially or after a little while when the revs go up? There are no adjustment screw for bypass allowance, just one that adjust the relative position for each plate. They are all synchronized now and closed 100%. The bypass holes are just a simple plate bypass…they could be JB welded easily. May do that tonight actually. The TPS is getting the proper 5V reference with the key in ON position, signal voltage is stable and correct (.5V closed, 3.5V WOT…values added to RTP calibration map…using MAP for primary load, TPS for seconday load) When the sensor is off of the throttle shaft…it sounds like something is loose inside. It also must be wound relative to the throttle shaft a full 360 degree before it will read anything less than a full 5V. ONce wound it will make a smooth transition in increasing voltage until WOT. THe MAP is seeing MORE vac pressure initially and it goes down as RPM goes up --- _[View the full topic](https://forums.speedlife.net/t/b18c-build-troubleshooting/196698)._