Low oil pressure warning light

[watisthis]

I know this has been asked before, but my circumstances are a bit different/dumb. Few days ago I flashed Lunds base tune, car battery died while trying to flash, replaced battery and was able to flash. First start up car cranks over but stalls within secs. Ends up being I forgot I had an aftermarket maf sensor (bought the car 2nd hand) and Lund was tuning for factory maf. Return maf to stock but I forget to seat the maf harness correctly and end up flooding the engine with gas (tried to start a few times both before maf change and after forgetting to seat properly so not sure if I damaged anything) prior to fixing said seating issue.

After all that I finally get the car started. Fires up nicely, holds rpm, no new noises that I can tell of. However, I get a low oil pressure light (didn't get said light when car was stalling, not sure if it had time to check?), I know this could be a tune issue. Car isn't PP but I'm not sure if prior owner had done anything to change that since it does have an aem afr gauge (could have set up for aem oil gauge too at the same time.) Lund has told me they sent me the non-PP tune. Not sure if its cause I flooded the engine with fuel if that could affect oil pressure that greatly, maybe oil pressure sensor just died, aftermarket sensor, something damaged, or tune.

I know this is an easy check, already triple checked dipstick levels and they're perfect, and I would have checked underneath last night if car wasn't lowered and I had a jack handy at my apartment. I know that's a lot but low workload today so my minds racing. Mainly just trying to figure out if flooding my engine with fuel would be a cause for my low oil pressure. Plan to change my oil and filter this weekend and get under the car and check the sensor. Last thing I want to do is drive it and it actually be an oil pressure issue.

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[armykyle1 [HACKED ACCOUNT]

It's pretty much Everytime this occurs, it's the wrong base tune. Flash back to stock. Crank the car, see if it comes back. If not, flash Lund tune again and if it comes back then, it's the tune.

 

[watisthis]

Oh yeah, didn't even think about trying to flash the stock tune. Question though, if I was tuned locally prior to flashing the Lund tune would it pull that tune which was already on the ecu or what? Not sure how it would get a completely stock tune just from reading the cars ecu if the previous tune wasn't stock at the time.

 

[Tricky Dickey]

If you have PP with the oil pressure gauge in the center dash you will need to make sure it’s tuned for it, otherwise low oil pressure warning light and gauge won’t work.

 

[ugstang17]

Oh yeah, didn't even think about trying to flash the stock tune. Question though, if I was tuned locally prior to flashing the Lund tune would it pull that tune which was already on the ecu or what? Not sure how it would get a completely stock tune just from reading the cars ecu if the previous tune wasn't stock at the time.

Whatever was in the ECU becomes the default tune as I understand it. My car had a Roush package put on it when it was purchased.

I had to reflash my car back to the original tune for the Roush phase 2 package to maintain it as such before I retuned with Lund so that the Ngauge would hold the Roush tune as factory. This allows me to put the original parts for the car back on and sell the car with the original phase 2 packge if that time ever comes. Had I not done this, the 3rd part y tune would have become the factory tune as far as the Ngauge was concerned.

 

[watisthis]

Yeah, that's what I figured. Seeing as the ngauge has no where to pull from other than the ecu and I doubt the ecu keeps a vin specific stock file cached outside of the last two (for me custom) known flashes. I'll flash the 'stock' tune tonight which I know didn't have low oil pressure light issues and go from there. Sitting at work anxious as hell, lmao.

 

[ugstang17]

Ngauge, SCT same same in that regard. Whatever the programmer sucks out of the ECU becomes your default tune unless you flash back first. People have taken their cars in for service with just the tune on the car. The service center providing a courtesy updates the ECU because a newer revision is out. Person gets car back and realizes something isn't the same. Plugs in device and it tells them the flash device is married to another car. So now they either go back and have the dealer back flash the tune (hoping that works) or they have to send the device to the maker and have it reset. In the case of the SCT unit it can be force reset (unmarried) 5 times before it locks up through software provided by SCT for your laptop. Don't know what Lund or HP tuner device would do in that case.

 

[watisthis]

Yeah, suppose I'll find out when I get home. Really hope I can flash whatever my 'stock' file is (I'm assuming it's the tune from my previous local tuner since that is what was last on the car prior to Lunds) back and the car will start right up without low oil pressure warning. Would be a whole lot easier to work on the car and diagnose things if I was able to drive it to my buddies, but would rather not risk it being an actual low oil pressure issue and driving it. But I would be surprised if it wasn't a tune issue cause all I've done other than flash Lunds tune from my previous tune is trying to start the car a few times with the wrong maf and a few more times with the factory maf not seating into the harness properly flooding the engine with gas. Checked plugs they had a small amount of gas on them but haven't smelled my dipstick to see if there was gas in the oil.

 

[ugstang17]

That was going to be my next question. Did the dipstick smell of fuel heavily? But I see you are already thinking in that direction. I would think not, but you have to rule things out before moving on to the next probable fault in the equation. Assuming only gets you chasing your tail.

That pressure sensor -- if you can locate it -- should be either open or closed if it is a conventional pressure sensor. On the 2011 the prints I have show the sensor as a NO (normally open) with no pressure present to generate an alarm. If pressure is present the sensor closes and provides ground to the circuit to satisfy that pressure is present.

The question of concern would be at what risk to the engine is this test in the event oil pressure is low? It is not uncommon on older vehicles to change oil and see the sending unit (oil pressure sensor) indicate low pressure until the oil moves through the engine for a few seconds after running. Some would claim the car should be cranked over with coil disconnected prior to starting after an oil change but I have never lost an engine over it in all my years of ownership. Do so at your reservation. It would be a tell tail that the problem resides in the tune if the sensor checks good with engine running or no presence of light on old tune -- whichever.

Sorry but not sure where the sensor is located on this car. It would likely be close to the oil filter I would presume but since there is also an oil temp sensor on the car as well as an oil level low on the car it would be a guess. I know where its at on a 2005 4.6L 3V. LOL!

 

[BmacIL]

When I loaded my AED base tune the oil pressure light was on. For the next revision he flipped it to the other sensor option and no more oil pressure light.

 

[watisthis]

When I loaded my AED base tune the oil pressure light was on. For the next revision he flipped it to the other sensor option and no more oil pressure light.

Haha, really hope thats what my problem is as well just really hesitant to try and drive the car.

 

[watisthis]

That was going to be my next question. Did the dipstick smell of fuel heavily? But I see you are already thinking in that direction. I would think not, but you have to rule things out before moving on to the next probable fault in the equation. Assuming only gets you chasing your tail.

That pressure sensor -- if you can locate it -- should be either open or closed if it is a conventional pressure sensor. On the 2011 the prints I have show the sensor as a NO (normally open) with no pressure present to generate an alarm. If pressure is present the sensor closes and provides ground to the circuit to satisfy that pressure is present.

The question of concern would be at what risk to the engine is this test in the event oil pressure is low? It is not uncommon on older vehicles to change oil and see the sending unit (oil pressure sensor) indicate low pressure until the oil moves through the engine for a few seconds after running. Some would claim the car should be cranked over with coil disconnected prior to starting after an oil change but I have never lost an engine over it in all my years of ownership. Do so at your reservation. It would be a tell tail that the problem resides in the tune if the sensor checks good with engine running or no presence of light on old tune -- whichever.

Sorry but not sure where the sensor is located on this car. It would likely be close to the oil filter I would presume but since there is also an oil temp sensor on the car as well as an oil level low on the car it would be a guess. I know where its at on a 2005 4.6L 3V. LOL!

Yeah, I know where the sensor is just don't have a jack at my apartment so have to wait for my buddy either tonight or tomorrow. Had my car idling for awhile to see where the oil temp would get to so I guess if it was going to seize my engine it would have already.

 

[ugstang17]

^^^ I've seen simple oops like this happen. A sort of more common one is that the AC unit will not come on after the tune is loaded. A simple revision resolves it. As much stuff as there is to remember, people are human and miss something like this once in a while. Just shows the tuner you put forth some effort to prove out your side before hollering 'wolf' so to speak. They tend to be more responsive on future revisions I have found as well.

 

[watisthis]

Exactly, not worried about the tune as I know they're crazy busy and shit happens. Just not trying to fuck around and drive with a low oil pressure warning, gotta manually make sure oil pressure is good and go from there.

 

[Minivanracer]

Exactly, not worried about the tune as I know they're crazy busy and shit happens. Just not trying to fuck around and drive with a low oil pressure warning, gotta manually make sure oil pressure is good and go from there.

Any update

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