I have a 1976 Chevy Cheyenne that I seem to be having engine trouble
with. It runs rough at idle and surges a little when driving. When I
accelerate quickly and let off the gas I hear a popping noise, almost
like a backfire, but it’s not coming from the exhaust. I recently
replaced the ignition module on this truck when it failed, and while I
was there replaced the plugs, wires, distributor, and coil. Nothing
seems amiss with any of this, but I’m still wondering if this repair
has anything to do with the trouble I’m having. Any help would be
appreciated. Thank in advance.
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Check and see if you might have gotten the distributor in there one tooth or
more out of position. this could cause the trouble you are speaking of.
To put the distributor back properly, there is an old tried and true method.
Unplug the ignition plug form the distibutor. Take #1 spark plug out, and
hold your finger over the hole while somebody "bumps" the motor over a bit
at a time, when your finger blows off the hole, #1 is close to firing
position. Now, line up the timing marks at zero degrees (TDC) and put the
distributor in again, making sure the rotor points to #1 position. You will
have to reset the timing on the motor, but you will at least be in the ball
The distributor may not fully seat when you do this. if so, just have the
other person bump the motor a few more times, and it will seat. (The Oil
pump tang has to fit into the slot on the bottom of the distibutor shaft for
it to seat).
That 76 could care less where the distrib is installed tooth wise..
I could put it in so that it points 180 degrees, or 90 degrees or
any other spot I so choose from where the book says
and as long as I wire the distributor with that in mind it will run just
I had the same trouble with my 77..Bad camshaft...had a lot of bad ones in
Pull the valve covers, and see if the rockers are are all rocking , if
there is one or two just being lazy,
you have a bad cam...fun job!
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