350 TBI Engine Miss

[fred75]

I'll look and let you know the part number for the plugs.

Fred,
when you time the TBI trucks you have to disconnect the two prong plug near the booster before you set the timing.
Factory spec says TDC but it has a little more get up and go at 2 degrees.

Hard to explain the interuption in the idol. Some are very light interuptions, no significant drop in idol, and others are heavy causing the rpms to drop noticeably.

   Gotcha on the plug & +2 degrees. I thought you might see what you saw in the plugs. My Hog passes a little oil up top, and when I had it overly rich on the fuel, the plugs would load up really quick. Looked to me more like oil fouled than rich. Leaned out the fuel and that cleaned them up real good. How many plugs not showin good color? Number of loaded up plugs pretty even on both banks?

[DnStClr]

This info from ACDelco surprises me. My maint manual also says .045 gap-

http://parts-catalog.acdelco.com/catalog/catalog_search.php

[Lt.Del]

TexasRed, .40 S&W

[JC_32]

I'll look and let you know the part number for the plugs.

Fred,
when you time the TBI trucks you have to disconnect the two prong plug near the booster before you set the timing.
Factory spec says TDC but it has a little more get up and go at 2 degrees.

Hard to explain the interuption in the idol. Some are very light interuptions, no significant drop in idol, and others are heavy causing the rpms to drop noticeably.

I don't have any way to adjust the fuel mixtures bc it's all computer controlled.
The plugs were definitely oil fouled.
I'm going to have to test to see if it's rings or seals?
The cylinders that didn't have the oil foul looked pretty good.
   Gotcha on the plug & +2 degrees. I thought you might see what you saw in the plugs. My Hog passes a little oil up top, and when I had it overly rich on the fuel, the plugs would load up really quick. Looked to me more like oil fouled than rich. Leaned out the fuel and that cleaned them up real good. How many plugs not showin good color? Number of loaded up plugs pretty even on both banks?

[fred75]

   Yup, you did say it was a TBI setup, and I've never seen a TBI run rich. Hopefully just seals... Have you done a compression or leak down test yet???

[JC_32]

Not yet, just not enough time in the day.

[fred75]

  Know what you mean....