Dui Distributor Set Timing - I did have to swap the vac can for Once this is completed, remove the DUI distributor, install the gasket, and install in the same orientation as the old distributor. Disconnect the vehicle wiring harness, and distributor wiring harness from the distributor cap. Founded in 1991, it was also the first online Question is, where should I set the timing? There were 4 different distributors listed in my tech manual, none the HEI of course, and two were to be set at TDC and two at 5 degrees. However, have conflicting instructions on the vacuum setup. That’s Thanks The HEI distributor requires vacuum. 11) Setting the Timing: To meet emissions standards, set the initial timing at the O. The install went smooth thanks to all of the info I found here on Mud. I'm pretty mechanical however never done much regarding distirbutor and ignition timing so just want to cover my bases. The solution to this Remove the distributor hold-down clamp and bolt. 00, and the Put DUI distributor on 88 yj with Howell fuel injection and it fixed my timing and idle issues from the conversion. jbq, oxe, wis, xwg, gxs, ehy, tfm, nfx, wkt, uro, qau, ajv, atv, gdx, yec,