[paulv7260]

Originally Posted by paulv7260

A couple of issues:

1. When I start er up and rev there is a mild backfire, not loud but more distinct than a cough.

2. Decelerating then cruising at 1500 RPMS there seems to be a lot of lag and what I think are vibrations coming from the chassis.

3. Car runs smoothly but at idle the lope is noticeable especially under my seat. To be expected with the L99?

860 miles on her. Thoughts from the experts before I take her in? I'm also waiting for the clip to fix the A pillar pop-out problem (its on backorder). Think I can wait until then?

Thanks

Paul

I promised an update when I had this stuff looked at so here it is:

OK, waited for break-in to go to the dealer. Did that yesterday with 2300 miles on her. I was really lucky because the mechanic that looked at my car also owns a 2010 L99 SS AND he is a tranny specialist.

On item 1 he says it is normal as the start-up mixture tends to be rich and leans out as the engine warms. Unless GM does a new program that's the way it is.

On item 2 he says it too is normal and his car does it too. He chalks it up to the program trying to conserve as much fuel as possible.

Item 3 is normal and I figured that out long ago so I didn't ask the mechanic.

The A-pillar fix was done weeks ago.


Paul