Re: [DML] Back on track! (update)

[Heydudetoo@xxxx]

Steve;
When your engine backfires, is it through the intake or out the tail pipe? 
An engine that back fires has either an intake or an exhaust valve 
open when the gas mixture for that cylinder explores. Carbon buildup in the 
engine can stay hot enough to light off gas mixer at the wrong time or the 
plug can receive fire at the wrong time. Valves must both (intake & exhaust) 
be closed tight when the mixture explores or you will get a backfire. 
The most likely thing is carbon in a plug, fire jumping inside the 
rotor cap,( bad plug wires cause this) or a weak / broken valve spring.
Pull a couple of plugs, are they carboned up? (black build up around 
the tip) If so, put in 6 new ones of the correct rating. The wrong heat 
range lets them run to cool to burn off the carbon and you get build up and 
back fires.
No carbon on the plugs, pull the rotor cap and check for blacken lines inside 
the cap.
Normally jumping fire will blacken this area. If there are black lines 
inside the cap replace the cap, rotor and plug wires.
A weak valve spring will give you backfires at high RPM, a broken one will 
give you Lots of backfires.
I believe this engine uses oil pressure to keep tension on the timing chains, 
how is your oil?
Anyway, just my two cents.
Jerry
Vin# 4890


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