Re: Popping 258 engine

[amcnut@xxxxxxxxxxxxxx]

Sounds like you have a valve stuck open or a burnt valve. You may need to pop off the valve cover and see if perhaps you have a bent pushrod or if there's something awry with the valvetrain. With the valve cover off, start the engine and let it idle (don't rev it, you'll have oil everywhere!) Watch to make sure all the valves are working, especially on #6. 
It might require a valve job, but that's not too bad a deal to do.

Jeff Reeves
79 Spirit GT
73 Javelin 401
72 Javelin SST
69 Ambassador DPL

Date: Sun, 17 Jul 2005 23:46:34 -0600
From: Teamamc <teamamc@xxxxxxxxxxx>
Subject: Poping 258 engine Any suggestions
To: mail@xxxxxxxxxxxx
Message-id: <007601c58b5c$0fa94210$6500a8c0@quicker>

I have an 81 Concord. 258 auto air.
At Idle the car gives off a poping sound through the carb.
If I pull number 6 wire the poping goes stops.
If I put the wire back on and rev the engine the pop turns into a violent bang through the carb.

I have changed plugs wire cap and rotor.
Adjusted timing. Compression is 145-150 across all cylinders.

It appears to be timing but I can't figure out whats left.
no matter where I put the distributor the pop is present.
With all 6 wires on the engine will idle.
As soon as you pop it in to gear the engine bangs and stalls.
If I remove #6 wire  I can put the car in gear and drive it.

Any Idea's.
I am stripping the car but want to make sure the engine runs well before pulling.


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