Hi,I'm at the final stages of converting my '90 K2500 Silverado from a 6.2 diesel to a 350 TBI from a '94 burb. One thing I didn't realize before sending the donor to the scrapyard is the VSSB/DRAC module that's supposed to be in there some where.
Is that really a signal that's needed by the PCM (which is a 7427 btw)? The tranny is a 700R4, and the lockup is controlled by vacuum (kit by TCI). During the first startups I experienced some rough idling, just as if a cylinder wasn't firing. And on the test run it hit the rev limiter at 4000RPM, would at least expect it to rev closer to 5. Could this be the PCM stopping it prematurely because it thinks the car is stationary?
If a VSSB/DRAC is needed, what parts am I looking for? Where on the car is it located? Is it just a case of inputing the signals from the VSS from the back of the transfer, and then it splits the signal into one going to the PCM and two to the speedo?
The fuel vapor thingy is also missing (the black box connected to the intake with a line going back to the fuel tank). Will that have any side effects?
Kind regards,
Martin
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