I've gone out to jump in the car to go somewhere, doesn't matter what time of the day or night, after sitting for periods of twelve hours or better, she'll start up horribly.
To describe it, it's like starting up a small two-stroke motor that is bone-cold or flooded. It'll barely rev and kick a few times than snap out of it into normal RPM. My 3.5 is doing just that, you start it up than it goes quiet and a few second later builds up RPM. The whirling I experienced before is not present, but it "taps" like a bastard for a few seconds. Swapped my rocker arms twice now. Starting to think it may be the SRV valve?
As far as the chugging start up, either a bad coolant mix or maybe a vacuum leak I assume?
Bad coolant mix would not affect startup (I mean unless you're in really sub-zero temps and it's freezing solid - not likely).
Likely you have leaking fuel injectors or leaking fuel pump check valve or pressure regulator emptying the fuel rail when it sits for very long. The rough running is while air gets purged out of the rail (and also getting raw fuel out of a cylinder(s) if the problem is one or more leaking injectors).
I had Bosch Platinum in there, and YUCK! no power, horrible starts, etc. Champion Coppers, More power than any of us are used to, starts right up, sounds a LOT better, and the Platinums only had something like 4.5K on them (That was back when we didn't drive here everywhere)
Make's sense, Peva. Wouldn't I smell gas in the oil or outside of the car if that were to be the case?...
If you have a leaky fuel injector, yes, because the cylinder with a leaky injector is getting flooded - so you get a raw gas smell out the tailpipe when it starts. But if leaky fuel pump check valve or pressure regulator, no - because that just means the fuel in the rail drains back into the fuel tank - no external exposure of fuel, so no smell. In fact if one of those things is the problem, that's how you tell which.
Looks like I got some digging too do than, thanks for the info guys.
Do you think crummy plugs could be a possibility Peva by any chance?
This morning she did the same thing. Fire ups at 200-300 RPM range and than after a few seconds speeds up. She tapped badly too, positive it's the SRV, as I've been through three sets of rocker arms. Never had issues until after having a HO intake.
Guess I'll check for a gas smell under the hood and exhaust pipe (I've always noticed an excessive amount of drips, presumed to be condensation). Which should determine what the deal is as far as the fuel system goes based on Peva's advice. I'll have to check the plugs for tightness as well, in fact just buy some new coppers, to hell with the platinum. It's roughly when I did the HO intake and plugs all the tapping started. I'm gonna try and rip the flap off the SRV (get another at the yard) to see if it's that causing it as well. It's odd, no whirling anymore, just the top-end rocker arm sounding rapid tap, that fades away 10-20 seconds into the startup
Last edited by SRT6INTREPID; 11-23-2012 at 06:44 PM..