JZTRK

95 5.0 W/T5 we let the car come up to temp shut it off pulled the spout restarted it and set the timing to 13 degrees shut it down put the spout back in and restarted it and it pings like a s.o.b
so we did the same thing to put back to 10 degres and it dose the same thing any where we set the timing the car has a few mods like msd 6al and msd coil it has a new distributor in it and it runs on 91 octane

mattdel

Distributor's a tooth off. Or more. Re-stab it.

Samsbolt390

The SN95 in question is mine, after replacing a bad msd coil it was cheap insurance to install a new Dist (the old one had corrosion). It was installed exactly like it came out and the timing was reset with the spout out, I decided that since it passed emissions that I could bump it to 12 degrees, we locked it down at 12.5 and it ran solid so I figured done deal and installed the spout. The minute I pulled away it began to knock and back fire under load and also backfired through the exhaust while slowly accelerating. I pulled the spout again and it ran fine. My mileage went away so back in with the spout after setting it to 10degrees. Felt great around the block but after a restart it was missing and knocking under load. I can see where if the dist is a tooth off with the spout in it maybe to far advanced by the computer. If this sounds logical than it maybe the next step but I'd like some more feed back If you all don't mind. Thanks Sam.

mattdel

Backfire + recent distributor install = distributor isn't in correctly.