Firing order, spark plugs, compression......


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Posted by chriscase on Sunday, August 21, 2005 at 11:15PM :

In Reply to: slant 6 -225 backfiring problem?? posted by jamie(ky) on Sunday, August 21, 2005 at 9:12PM :

Was it back firing before you swapped parts, or did something go in wrong?

A quick test to eliminate mechanical problems is a 'cranking balance tast'. Unplug and ground the secondary lead from coil to cap, then crank engine. It should sound monotonous- wump, wump, wump, wump. A weak cylinder will have a rhythm: wump, wump, erk, wump.

Next do a dynamic balance test: with engine idling, pull one plug wire from the cap at a time. each should cause a similar loss of revs- the one that don't cause any worseness in idle is a bad one. Do all cylinders, you may have 2 wires crossed....

The firing order on all inline 6's is 153624. Remember this:

15 is too young,
36 is too old,
24 is just right.

( just a menomic, NOT the opinion of the author. Besides, sheep don't life that long)

Getting a hold of " A little old lady from Pasadena's" car can cause some headaches. Carbon from not driving hard enough can come loose and cause damage. Or she never revved it, so it has a ridge in the cylinders. Then you drive it hard enough that the piston fly up and the rings hit the ridge, and break the rings....

Most /6's had solid lifters, it may have a tight valve....

We're here to help, just ask.



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