2011 CTS Coupe Premium
Orlando - We take orphans
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Don't you remember his other posts?I mean, WTF? A little stressed, are we?
Hmmm. All those spikes - and no real misfires. Makes me suspect a tank of really bad gas or a failing sensor or a failing connection to a sensor - but which one could cause your LTFT to jump around like that? And on both banks? Hmmmm.I checked the hoses are tight fitting on the connectors - nothing loose or leaking.
there really isn’t a PCV valve, it’s more of just an elbow. But I did remove it and there’s no blockage and it’s really not oily either. (Hose goes from air intake to pcv elbow and is good.)
Air filter was replaced about 7000 miles ago.
The $8 iridium spark plugs. They were pregapped around 45 (which is correct for the 3.0 engine) so I didn’t adjust the gap.Hmmm. All those spikes - and no real misfires. Makes me suspect a tank of really bad gas or a failing sensor or a failing connection to a sensor - but which one could cause your LTFT to jump around like that? And on both banks? Hmmmm.
What spark plugs did you use and what are they gapped at?
I’m guessing the fuel filter isn’t along the line under the car?Yup. Misfires don't seem to be the problem. It seems to be fuel delivery. But why?
No "in-line" fuel filter on these cars.I’m guessing the fuel filter isn’t along the line under the car?
I still feel like it’s more “behind the engine” related, I wonder if a tranny mount or the flex discs that attach the shaft are causing the bucking...
And I’m assuming without a lift I can’t check the tranny fluid to see if it’s fowl or low.
ok, here’s the car at idle in the driveway for 5 mins from a cold start.Well, the stutter shows in the fuel trims levels, fuel rail pressure, and a host of other things. I am out of my depth on this but I do wonder if there's a problem with either the high pressure fuel pump or a sensor that manages the signals to it. Those swings in critical numbers are very abrupt - I just can't see them being caused by the transmission. Maybe the throttle position sensor??
If it is the TPS, it's easily tested. But if there was a problem, you'd think there'd be a CEL and a code.
What are you seeing in throttle position and fuel rail pressure at a steady idle and at a steady 1500 rpm?