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Re: [T3] Engine/backfire


On 29 Oct 98, at 11:39, oofacts@earthlink.net wrote:

> Let me ask you, when I'm driving on the highway, I can hear a low
> ticking coming off the guard rails. Not pinging (I've had that - bad gas).
> I can't tell with the engine cover off what it is because its so noisy in
> general and my ear is untrained and unfamiliar with a properly tuned
> engine.. And when I'm at idle, all I hear is the exhaust steadily
> puttering. 
> Checking my valve clearance this weekend.

Yes, check valves.  I recommend .004/.006, I/E.  Also check your 
compression (engine warm, throttle wide open.)

> Also, every now and then, especially when warming up, I get little
> backfires. Tiny and occassional, but sort of like a miss. Before I put in
> the new distributors and sparks, when I was up at Keith's he noted the car
> was too rich because it was so sluggish starting up and then noticed only
> two cylinders were firing. I figured this had to do with fouled up plugs
> and once the car had a few minutes to warm up, all four cylinders were
> running again. I have the new distrib and the carbs synced but every now
> and then....pop pop.

True backfires occur when the mixture is too lean.  Misses can have 
many causes.

Jim
-
*******************************
Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA
*******************************

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