HEART ATTACK! GT3 996 OIL PRESSURE
07-19-2018, 01:21 PM
#16
Subscribed. I don't have much to add to the good suggestions made by others, but I'm interested in what is found. If you hadn't just had the oil changed, the oil pressure sending unit would be a prime suspect. But it's odd and disconcerting that the sending unit would choose to fail simultaneously with the oil change. I endorse first pulling the filter out and apart and examining it very carefully. You don't need to drain the oil to do this. It will allow you to examine the filter and cavity system, and you can pull apart the paper filter element to see if there are any metallic particles that would indicate deterioration has already taken place. If not, you can breathe a sigh of relief. I think. And you can continue the diagnosis. But I would first want to get my arms around the worst case possibility, to make sure that no damage has already occurred. Then connect a mechanical pressure gauge and verify whether your electric gauge is making sense -- which should be obvious in just a few seconds of running. In fact, you can get a valid signal just by turning the engine over on the starter motor (pull the fuel pump fuse so it doesn't fire). However, I'm not sure where you can best tap into the system to externally monitor pressure. If you find a true oil pressure deficiency, then the engine should not be run at all until you've done whatever disassembly is necessary to get to the bottom of it. Very interesting problem; I hope (and suspect) it's something minor. Please report in once you know.
07-19-2018, 01:41 PM
#17
Rennlist Member
"tired engine" BWHAHahahahahahhahahahaha
I wouldn't let that guy check the pressure in my tires.
I hope the suggestion of simply replacing oil and filter does the trick.
I wouldn't let that guy check the pressure in my tires.
I hope the suggestion of simply replacing oil and filter does the trick.
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Doug DeArmond (04-12-2022)
07-20-2018, 01:02 AM
#19
I've tried to do a summary of all of the insightful comments and will go through each of these points with the workshop next week, thanks again.
check the oil filter for correct fitment (including the small O ring @ the bottom of the plastic spike)
Check for any foreign objects down the well post removing filter
connect a mechanical oil pressure gauge to double check the pressure.
Check if removed the oil pressure bypass fitting by mistake and did not re-install correctly
Oil filter original Mann HU 719/5 x or equal quality.
SENSOR:
Could the oil pressure sensor be the problem?
check the oil filter for correct fitment (including the small O ring @ the bottom of the plastic spike)
Check for any foreign objects down the well post removing filter
connect a mechanical oil pressure gauge to double check the pressure.
Check if removed the oil pressure bypass fitting by mistake and did not re-install correctly
Oil filter original Mann HU 719/5 x or equal quality.
SENSOR:
Could the oil pressure sensor be the problem?
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Doug DeArmond (04-12-2022)
07-20-2018, 01:10 AM
#20
Rennlist Member
Find a new shop!
ie get a second opinion.
ie get a second opinion.
07-20-2018, 01:24 AM
#21
fact that issue occurred directly after oil change means the areas touched should be reviewed first, oil filter area is most likely. Oil pressure senders have been widely known to have issues with the wiring connectors at the sensor failing off/poor connection as well...sensors have also been semi common item.
Manual gauge check is smart move if above doesn't have an obvious issue, Mann or Mahle OX128/1D filter both excellent, shop mistaking pressure spring port another great suggestion.
Manual gauge check is smart move if above doesn't have an obvious issue, Mann or Mahle OX128/1D filter both excellent, shop mistaking pressure spring port another great suggestion.
07-23-2018, 03:48 AM
#22
Great news! Diagnosis has been made of a faulty pressure sender unit, the unit itself, not the electrical connections.
Workshop admitted they missed it
manual pressure gauge fitted, excellent pressure, no problems with filter either.
thanks again to everyone for the great support
will be jumping into a race track now again, not jumping off a cliff!
Workshop admitted they missed it
manual pressure gauge fitted, excellent pressure, no problems with filter either.
thanks again to everyone for the great support
will be jumping into a race track now again, not jumping off a cliff!
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Doug DeArmond (04-12-2022)
07-23-2018, 07:02 AM
#23
Racer
That's a good outcome BUT...
Personally, looking @ the excuses the shop made re "tired engine, oil thickening up & too many track days" (meaning its not really their fault) before they investigated further & actually tested the oil pressure with a mechanical gage, I would not use them again.....
Personally, looking @ the excuses the shop made re "tired engine, oil thickening up & too many track days" (meaning its not really their fault) before they investigated further & actually tested the oil pressure with a mechanical gage, I would not use them again.....
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Doug DeArmond (04-12-2022)
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Doug DeArmond (04-12-2022)
07-23-2018, 06:32 PM
#25
That's a good outcome BUT...
Personally, looking @ the excuses the shop made re "tired engine, oil thickening up & too many track days" (meaning its not really their fault) before they investigated further & actually tested the oil pressure with a mechanical gage, I would not use them again.....
Personally, looking @ the excuses the shop made re "tired engine, oil thickening up & too many track days" (meaning its not really their fault) before they investigated further & actually tested the oil pressure with a mechanical gage, I would not use them again.....
07-23-2018, 07:41 PM
#26
Rennlist Member
I completely agree with this statement. You dodged a bullet, but I wouldn't want to risk letting that shop hold the gun again. If an oil change caused all this heartache, imagine what might happen when you need some *real* work done, and you get a nonsensical diagnosis. I'm glad to hear it's okay, thank you for sharing the outcome. Now to find a better shop...
07-25-2018, 01:28 AM
#27
Thanks again to all, can't tell you how much of a relief it is! My engine has always run brilliantly after a pretty tough life. starts first time even after leaving in the garage for say two months.
That engine is one of the most amazing Porsche items ever made 996 & 997 GT3 the only way to go.
ps I'm struggling to find the part number for the oil pressure sender on PET I'm not a mechanical guru either. Have attached some screenshots.
any wisdom re the part number? Thank you
That engine is one of the most amazing Porsche items ever made 996 & 997 GT3 the only way to go.
ps I'm struggling to find the part number for the oil pressure sender on PET I'm not a mechanical guru either. Have attached some screenshots.
any wisdom re the part number? Thank you
07-25-2018, 05:59 AM
#29
Racer
I'm pretty sure its item #38 on the first PET illustration. Porsche part #996 606 203 03 (Oldruckschalter).
Its not difficult to change - if you look @ the engine, its located on the r/h/side under the inlet manifold. Just pull off the 2 x electrical connections and the unscrew the sender unit.
Its not difficult to change - if you look @ the engine, its located on the r/h/side under the inlet manifold. Just pull off the 2 x electrical connections and the unscrew the sender unit.
04-10-2022, 10:01 AM
#30
Three Wheelin'
Hi all. Resurrecting this old thread as I very intermittently exp the failure notification and would like to replace the oil pressure sender (original to the car).
Can anyone confirm the info in Posts 28 on; ie, the part number provided and the location of the unit?
Does anyone have a pic of the location of the unit (to protect me from doing stupid things to my car lol)?
Any been there/don't do that issues ;-)?
TIA!
Edit - shld have chked here 1st - there is a link over to the 996 forum in the "must read threads" above [ https://rennlist.com/forums/996-foru...ement-diy.html ] w pics etc.
Let me know if any of you know of updated or differing part numbers or gen exp (to be avoided or to be practiced :-) TIA!
Can anyone confirm the info in Posts 28 on; ie, the part number provided and the location of the unit?
Does anyone have a pic of the location of the unit (to protect me from doing stupid things to my car lol)?
Any been there/don't do that issues ;-)?
TIA!
Edit - shld have chked here 1st - there is a link over to the 996 forum in the "must read threads" above [ https://rennlist.com/forums/996-foru...ement-diy.html ] w pics etc.
Let me know if any of you know of updated or differing part numbers or gen exp (to be avoided or to be practiced :-) TIA!
Last edited by cello; 04-10-2022 at 10:23 AM.