No just checking everything I can think of.
After driving it for a few days the biggest change so far is that the random slight misfire at idle seems to be intermittent. Sometimes sitting at a light I don’t feel it at all and other times after I park in a spot you can feel the misfires happening / engine shaking.
Hello socal K1500,
When I first purchased my '99 C2500 with the 454, the engine was mechanically quiet,
but the SES was on, there was a lot of misfiring at idle, a little chuggy at neighborhood speeds, but
seemed to run better the more throttle you gave it? And, confusingly, felt strong like bull on the Interstate?
Anyway, if you haven't seen this thread before, I show how it took me a total of (4) troubleshooting
passes to fix overlapping issues before I got the idle sorted out to my satisfaction. Now the idle
is smooth big block burble, and the gas pedal has that nice 'iron fist in a velvet glove' feel.
Whatever you want, smooth & sure. Always a little more available if you wish. :0)
Not saying that you have any/all of the issues in your engine bay that I had, but I'd ask you to give
your powerplant a critical eye and make sure that all the common sense stuff that can affect your idle
quality is known-good before we dig in and look for the most obscure/exotic rough idle reasons.
(
The Hunt for a smooth 7.4 idle)
The good news? If you are after a smooth idle, I actually believe that the SBC can deliver a smoother
idle than the BBC, all things being equal. (It gets into boring combustion chamber stuff that we'll not
go into here -- but this is one of those places where smaller is better when making only a couple % of
rated power.) We've budget blueprinted a couple of SBCs in the past, and they can be such a pleasure
to be around when everything is optimized, even in 'stock' tune.
For what it's worth. And if you discover anything of interest in your hunt for a factory smooth idle,
be sure to post photos and share the wealth.
Best of luck --