The oil pressure in my 89 gxl is messed up, or is it the guage? When I start it up it raises to about 60psi, but only for a few seconds. It will slowly drop down to about 30psi whether or not its being revved, and it continues to slowly drop down to pretty much nothing. The oil level is normal, and it doesnt seem to run hot.



I know 3rd gens have an oil pressure sending unit which has been known to go bad, but I havent found anything about those with the 2nd gen. I just hope I dont have to replace the oil pump... kind of a pain in the ass. Any ideas would be great.



Thanks

its possible its the sender, we used to stock it n201-14-820



mike

where is that located? I cant find it in the manual

Pretty much underneath the oil filter location.



C

The stock gauge does that in my 88, it sort of floats around while your driving it. I put in an aftermarket one, works good.

so should i replace the gauge? or the sender? i figured out where it is. it has some crusty ass wire plugged into it. i tried cleaning it off and i still get same results. is there any way to test it? everything seems to be fine but i dont wanna be driving this thing around if i might be damaging the engine.

take a quick oil sample to see if metal shavings are in the oil.

Usually the senders go bad. I need to replace mine on the T2 right now.

Its probably the sender on mine as well, I just sort of used the term gauge for the whole shabang. I bought an autometer one for around 50 bucks from summit, it seems to work just fine.

nice. my oil seems to be fine... all clean of shavings and no leakage. I'll let you know if I blow up. anyone know where I can get a replacement? We're sort of strapped for parts stores in my town. Thanks

You can order the sender through www.Mazdatrix.com

ive got one i can send you for like 20 bucks if you want it, its a new one from mazdatrix. I got it and it didnt work properly with the autometer gauge i had, different volatges or something. Bought it because i thought the old sender was bad but it ended up doing the exact same thing... So anyway, replaced that with a mechanical one. No more electrical problems.

Mine was doing this, it either read zero (most of the time) or it would pin above 110 (???). Cleaned the wire, pulled the sender, couldn't get it to work.



Then, one day, I pulled the sender while there was oil in the system (accidentally https://www.nopistons.com/forums/pub... ). An ounce or two drained out, replaced the sender, works great ever since. I think there was something clogging the sender (alternately giving it no access to the oil, or creating a high-pressure spurt) and opening it with the draining oil cleared it out.

i just put 10/30 motor oil in my T2 and the oil pressure is WAY HIGH i mean like 3/4 the way up the gauge (i don't know exactly what psi that is) but i mean good oil pressure is good right?

when is it reading 3/4? I think that is fine... my stock guage reads about that above 3k rpm and my Autometer which is reading from the oil pedestal holds 65-75psi above 3k usually and 24psi at idle.. 20w50 oil