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I agree with Justin my first thought is always to be skeptical of factory gauges, especially oil pressure. These days they usually don't provide a real reading but are buffered or even processed through the ECU so as not to alarm people by, you know, actually moving. I have a '79 vehicle and even the replacement sender I put in buffered the actual oil pressure to the gauge basically making it useless (it shows two readings, no oil pressure or some or more oil pressure) compared to the original sender which gave a true reading and actually moved.
Anyway, the test is to hook up a mechanical test gauge. The dealer will most definitely have one, or a parts store or the internet will have one. It will have fitting for most vehicle. Don't know if the LS has an easily accessible oil pressure port, but if they replaced the sender they can sure hook up the test gauge. You can snake it out the back of the hood and drive around with it sticking up in front of the windshield.
I am a bit nervous about this being a mechanical issue though since it's so consistent with the movement of the car. The obvious thing would be that the oil pump pick up tube fell off. I'd be curious if the tube is at front of the engine, since that would be consistent with losing pressure on acceleration. Certainly in the old small block chevy days this could happen rarely, and some rebuilders tack weld the pick up tube to the pump for extra security. I have no idea about the LS though. You'd really have to pull the oil pan to check it out, and again no idea how easy that is on these vehicle, or potentially use one of the those fiber optic gizmos to stick in the oil drain hole to check things out down there. That's the only mechanical issue I could think of potentially causing this, though again I'm not familiar with the LS (and I'm confused why the dealer would think of this - they don't sound very 'diagnostic focused' honestly). You did check your oil level, right :)
posted by 66.91.209...
, Thu, 10 Dec 2015 14:44:51
, Fri, 11 Dec 2015 12:25:28
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