temperature and oil pressure problem...help please
#1
06-29-2008, 07:52 PM
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temperature and oil pressure problem...help please
I bought a 97 xk8 with a blown headgasket. I had both heads rebuilt as a precaution, changed gaskets,thermostat,waterpump and an aluminum thermostat housing as the previous one had a small split in it.) Took it out for a spin yesterday for the first time and all was well till I saw the temp creap up from the half way mark on the guage...as soon as that happened the 'low oil pressure' light came on and I looked at the guage and it was low, gave it a quick rev and it came back up...then I shut the engine off. I restarted it this morning, it was obviously cooled down, and ran it at idle for 25 minutes-temp and pressure was good and it is in the mid 80's here with a high humidity. at the 26 minute mark I noticed the oil pressure guage bobling a little then it dropped down again but the water temp was still good at the half way mark? I reved up again and the pressure bounces back up to the half mark then once I lay off the gas it dropps again...the oil is clear and freshly changed after the flushing when the headgasket was changed and hasn't ran since.
for the temp problem...could it be rad??
for the oil pressure is it sender related or need a new pymp...compression is good??
any help is great for me thanks !!
for the temp problem...could it be rad??
for the oil pressure is it sender related or need a new pymp...compression is good??
any help is great for me thanks !!
#2
07-08-2008, 12:57 AM
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RE: temperature and oil pressure problem...help please
had some time to look into the problem, ran it again for 23-25 minutes and all was good, temp held well, then the oil pressure guage dropped again and with a few revs comes back up and when idle is resumed, drops again...
could this be a oil viscosity problem or a pump issue, as far asI understand the pump is mechanical and my understanding is if it were defective it would not work from the getgo or at least not as long as it does?
any help from the guru's would be great...the summer is passing by and my new baby is still in the garage...uggghhhh
cheers
could this be a oil viscosity problem or a pump issue, as far asI understand the pump is mechanical and my understanding is if it were defective it would not work from the getgo or at least not as long as it does?
any help from the guru's would be great...the summer is passing by and my new baby is still in the garage...uggghhhh
cheers
#3
07-08-2008, 06:55 AM
Veteran Member
RE: temperature and oil pressure problem...help please
Todd,
I am certainly not a guru but I would suggest that you chase the sensor/electrical side before tearing into the mechancial. Remember, the oil pressure guage is not an analog guage but simply an idiot light disguised as a guage. Sending unit is located down near the oil filter.
Unless the head work left a large oil passage open when it should not be I cannot see why that would have caused the problem.
I am certainly not a guru but I would suggest that you chase the sensor/electrical side before tearing into the mechancial. Remember, the oil pressure guage is not an analog guage but simply an idiot light disguised as a guage. Sending unit is located down near the oil filter.
Unless the head work left a large oil passage open when it should not be I cannot see why that would have caused the problem.
#4
07-08-2008, 12:00 PM
Veteran Member
RE: temperature and oil pressure problem...help please
I once had a Bonneville (I was young!) and I had the same problem with oil pressure you are describing. It was fine when I first started it but after about 30 minutes (just long enough to get to class) the pressure would drop. Usually it sat for several hours while I was in class and when I came back out the pressure was fine. Then I would drive it to work and by the time I got there the pressure had dropped again.
The problem turned out to be trash in the oil pan. Apparently when I first started the car, the screen on the end of the pickup tube in the oil pan was clear and the pump could pull the oil freely from the oil pan. As I drove and the oil in the pan circulated, the trash would accumulate on the screen of the pickup tube and block the pumps ability to pull the oil from the pan. I took the pan off and sure enough, it had a lot of trash in it. I cleaned it off, put it back on and the problem went away.
But I agree with test point - check the smaller stuff/sender before tearing into mechanical possibilities. I hope your pump is not gone.
I don't know if you can change the oil pump out on these engines without cracking open the block.
The problem turned out to be trash in the oil pan. Apparently when I first started the car, the screen on the end of the pickup tube in the oil pan was clear and the pump could pull the oil freely from the oil pan. As I drove and the oil in the pan circulated, the trash would accumulate on the screen of the pickup tube and block the pumps ability to pull the oil from the pan. I took the pan off and sure enough, it had a lot of trash in it. I cleaned it off, put it back on and the problem went away.
But I agree with test point - check the smaller stuff/sender before tearing into mechanical possibilities. I hope your pump is not gone.
I don't know if you can change the oil pump out on these engines without cracking open the block.
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