Low Oil Pressure.. - ZR-1 Net Registry Forums

maxxpower · 05-13-2011

Hi All...

It's been a while since I've been on the forums as unfortunately my '91 ZR has set idle for the better part of 2 years as life and building a new house got in the way. However it did get a little run time shuttling it from here to there. All I can say is, with as crazy as things have been the last couple of years, thank goodness the car always started, ran perfectly and never gave me a moments concern! Thank you Marc!!

Anyways, I had the car out yesterday getting my emission test done (had to put cats on it first) and when coming back I was flogging it a little bit (as I always do) and the LT5 didn't miss a beat, pulled strong, felt and sounded great! But, a few miles down the road I noticed the oil pressure about a 1/3 of what it normally is and when I slowed to an idle the pressure gauge went hard to 0! The gauge wasn't erratic at a steady rpm, but wasn't completely solid as it has been in the past. There was also no strange noises or warning lights, so I basically didn't let it go to an idle again and limped home where it sits now on the hoist. I had a good look and didn't see anything obvious so I pulled the oil drain plug figuring an oil change couldn't hurt anything and left it. I have run Amsoil in it since new and the oil always looks good coming out. This time was no exception, all looks normal. The car has 36K kilometers (23K miles) on it, most of them a 1/4 mile at a time.

I don't know if the few runs to 7K had anything to do with it or if this was just a coincidence? I was just wondering if there is a common item that others have had the same condition with or any thoughts as to what might be wrong... oil pressure sensor, switch, oil pump bypass stuck??

Thanks... Greg

05-13-2011	#1
maxxpower Join Date: Apr 2011 Location: Guelph, Ontario Posts: 9	Low Oil Pressure.. Hi All... It's been a while since I've been on the forums as unfortunately my '91 ZR has set idle for the better part of 2 years as life and building a new house got in the way. However it did get a little run time shuttling it from here to there. All I can say is, with as crazy as things have been the last couple of years, thank goodness the car always started, ran perfectly and never gave me a moments concern! Thank you Marc!! Anyways, I had the car out yesterday getting my emission test done (had to put cats on it first) and when coming back I was flogging it a little bit (as I always do) and the LT5 didn't miss a beat, pulled strong, felt and sounded great! But, a few miles down the road I noticed the oil pressure about a 1/3 of what it normally is and when I slowed to an idle the pressure gauge went hard to 0! The gauge wasn't erratic at a steady rpm, but wasn't completely solid as it has been in the past. There was also no strange noises or warning lights, so I basically didn't let it go to an idle again and limped home where it sits now on the hoist. I had a good look and didn't see anything obvious so I pulled the oil drain plug figuring an oil change couldn't hurt anything and left it. I have run Amsoil in it since new and the oil always looks good coming out. This time was no exception, all looks normal. The car has 36K kilometers (23K miles) on it, most of them a 1/4 mile at a time. I don't know if the few runs to 7K had anything to do with it or if this was just a coincidence? I was just wondering if there is a common item that others have had the same condition with or any thoughts as to what might be wrong... oil pressure sensor, switch, oil pump bypass stuck?? Thanks... Greg