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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old March 10th, 2012, 08:29   #1
vgr
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Default Blinking Oil Light / oil pressure question

I started my car this morning in my driveway after it sat for 3 days and within 15 seconds of starting my oil light started blinking and beeping. I panicked and turned the car off. (I just assume if an oil light goes off its telling me "STOP")

I checked the motor and the undercarriage for oil spray and I didn't see any, nor is there any sign of leaking oil on my skidplate. The oil level is a little lower than it was a week ago when I checked it, but not significantly.

From my research here it seems like to properly diagnose this I need to do an oil pressure test. It sounds like this issue could just be the oil pressure sensor, however, it could also be an oil pressure problem which will cook the engine quick. (according to this thread). http://forums.tdiclub.com/showthread.php?t=334289

I live 3 hours from the nearest guru so taking it to a guru would mean a 3 hour tow, or a 3 hour drive, I'm not going to do the drive if I'm in question about this (hell I'm not going to do a 30 second drive). Is this something that with the right tools, I could accomplish myself? I did some searching and didn't find anything about how to do it, maybe I missed it?

My last thought is this, from talking with a friend who owned a tdi for several years, he said had this happen to him when the car would sit for several days in cold weather, and he would assume that the oil drained from the heads, and that it was never an issue for him. How plausible is this, as this is my exact situation.
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Last edited by vgr; March 10th, 2012 at 08:36. Reason: grammar
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Old March 10th, 2012, 09:32   #2
jettawreck
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I have never had the oil light come on from sitting in the cold even for months. Oil pressure builds almost instantly, unless maybe you are using some 15w-40 dino stuff.
I did have a few randon scares when I had the 2000 Jetta TDI while cruising down the road. Shut off immediately and looked it over and when restarted, no more light/buzzer. Months or year later it would happen again. Bad sending unit/connection??
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Old March 10th, 2012, 09:40   #3
whitedog
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The oil pressure switch is a single wire switch, so you can unplug it and touch it to ground to see if the flashing stops.

You should check to see what the oil pressure is though. The port thread is M10X1.0, but in a pinch you can use a 1/8 pipe thread adapter, but I don't know what it would do to the metric threads, so I don't recommend it.
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Old March 10th, 2012, 10:02   #4
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Jettawreck its quartz 15w40

Whitedog great information one question however what sort of tool do i use to test the oil, and would they sell it at advanced/napa (ive never done this sort of engine dianostics). I should note that i do have the full Bentley manual and vagcom cable
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Old March 10th, 2012, 10:55   #5
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NAPA should have what you need.
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Old March 10th, 2012, 11:10   #6
jettawreck
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Quote:
Originally Posted by vgr View Post
Jettawreck its quartz 15w40

Whitedog great information one question however what sort of tool do i use to test the oil, and would they sell it at advanced/napa (ive never done this sort of engine dianostics). I should note that i do have the full Bentley manual and vagcom cable

Wrong oil. '98 TDI is 5w-40 full synthetic. Get that out of there.
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2001 Jetta TDI GLS Silver-current driver (salvage)permanently vented-Panzer Plate-Sprint 520s-ScanGauge-CheckTemp III-ZeroStart heater-CAT 2 filter
2003 Jetta GLS Black w/leather (New Project Car) fixer-upper w/broken TB
2004 Cadillac SLS (wife's)
1999 GMC Suburban (It's MN-you need one)
197? Shibura 2cyl diesel 4WD tractor-loader/brushhog (very handy unit)
196? International TD340 Dozer-w/Drott 4-in-1 bucket/back ripper attachment

Last edited by jettawreck; March 10th, 2012 at 11:12.
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Old March 10th, 2012, 11:28   #7
vgr
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Quote:
Originally Posted by jettawreck View Post
Wrong oil. '98 TDI is 5w-40 full synthetic. Get that out of there.
Sorry, dumb not reading/typing on phone, it is 5w in the engine, I double checked the bottle I used (still in my shed)
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Old March 11th, 2012, 11:30   #8
MrSafety
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Default ... my Oil Pressure "idiot light" came on too... !

"vgr",
Yes, my Oil Pressure "idiot warning light" came on recently and
I too shut down the engine out of the same concern as yours....
but in my case it was my 1.6L diesel powered Rabbit p/u that is my latest project vehicle !
After checking to make sure my recent oil/filter change was still showing on the dip-stick,
I checked the pressure sender unit/switch... and not being convinced it was OK,
I changed it out anyhow for ~$8.00 !
Well my light kept turning on intermittently... so I abandoned paying any attention
to the dash cluster oil pressure Idiot Light and installed an
audible "ding-dong" alarm and hooked it up to the new pressure sender switch...
so now it really gets my attention... and essentially my problem went away.
So in my case the problem was intermittent and somewhere in the dash cluster light warning system!
Now that I have a reliable audible warning system, my idiot light still periodically comes on!
So maybe you have the same kind of problem... in your dash cluster!??
But IF I were you and you can adapt and hook up
an analog pressure gauge for a while to monitor your oil pressure
and also keep your dash idiot light working,
I would use both and look at the gauge regularly and
definitely look at it any time the dash idiot light came on!
I now kind of like my "ding-dong" alarm...
for it definitely does a better job of alerting the driver than the lights ever did!
I might keep my "ding-dong" alarm... for recently it alerted me that
I was a mere 0.5 qts low in oil when it kept giving me a single "ding" whenever I made a sharp left turn!!!
I added the oil and no more "ding" !!
Regards,
Sam Ross
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Last edited by MrSafety; March 11th, 2012 at 11:33. Reason: [edit] in Bright Blue!
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Old March 13th, 2012, 20:27   #9
Lawman36
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Where is the the oil sensor located?
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Old March 13th, 2012, 21:02   #10
whitedog
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On the oil filter housing, on the left side as you look down.
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Old March 13th, 2012, 21:03   #11
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Don't use a 1/8 NPT in the port it will ruin it. M10X1.0 threads are not tapered but NPT threads are (i.e. crush fit). You are going into aluminum not steel. Not sure where the sender is on a Jetta but on an A4 beetle it's near the base where the oil filter is. You can put in a tee adapter and have the stock oil pressure sender as well as one for an oil pressure gauge. Takes away the guessing.
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Old March 13th, 2012, 21:10   #12
whitedog
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Quote:
Originally Posted by KROWBAR View Post
Don't use a 1/8 NPT in the port it will ruin it. M10X1.0 threads are not tapered but NPT threads are (i.e. crush fit). You are going into aluminum not steel.
Absolutely agree, but sometimes a dogs gotta do what a dogs gotta do.
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