Oil pressure seems low at idle
- Thread starter Parker_
- Start date
If it makes you feel any better. The LLY in my street rod idles at 10-12 on a hot day. Goes to 25+ at just above 1000rpm so I haven't been too worried.
I am having a similar issue and am hoping someone here can help.
My 05 LLY is having a low oil pressure alarm go off at idle. It just started doing this so my mechanic friend that happens to have the same truck knew about the instrument cluster repair so he did that. He also replace the sending unit (actual oil pressure sensor) at the same time. I am still having the same problem. As soon as the truck warms up the oil pressure goes very low at idle setting off the alarm. If I throw it in neutral and rev it up a little the alarm stops and I show a little pressure on the dash.
My mechanic hooked up his computer to it and at a warm idle it is reading 4.5psi of oil pressure.
The truck only has 80k miles on it and is running 15w40 oil to the best of my knowledge with a AC Delco oil filter. He drained the oil today and found nothing out of the ordinary.
Side note: Just prior to this problem I had a 52 gal Titan fuel tank installed. The heat exchanger thingy majig couldn't possibly be leaking diesel into my oil could it?? Again my buddy said the oil did not seem to have diesel in it but it did read a little bit high on the dip stick before draining it.
Side note #2: This truck is new to me and I have never owned a diesel. I just inherited it from my father in law that passed from cancer. Its an AWESOME truck with a full Banks kit on it with a mild lift and 4x4. I just need to get to the bottom of this oil pressure issue.
My 05 LLY is having a low oil pressure alarm go off at idle. It just started doing this so my mechanic friend that happens to have the same truck knew about the instrument cluster repair so he did that. He also replace the sending unit (actual oil pressure sensor) at the same time. I am still having the same problem. As soon as the truck warms up the oil pressure goes very low at idle setting off the alarm. If I throw it in neutral and rev it up a little the alarm stops and I show a little pressure on the dash.
My mechanic hooked up his computer to it and at a warm idle it is reading 4.5psi of oil pressure.
The truck only has 80k miles on it and is running 15w40 oil to the best of my knowledge with a AC Delco oil filter. He drained the oil today and found nothing out of the ordinary.
Side note: Just prior to this problem I had a 52 gal Titan fuel tank installed. The heat exchanger thingy majig couldn't possibly be leaking diesel into my oil could it?? Again my buddy said the oil did not seem to have diesel in it but it did read a little bit high on the dip stick before draining it.
Side note #2: This truck is new to me and I have never owned a diesel. I just inherited it from my father in law that passed from cancer. Its an AWESOME truck with a full Banks kit on it with a mild lift and 4x4. I just need to get to the bottom of this oil pressure issue.
I was hoping that it might be that simple but I thought it was far fetched. Has anyone ever heard of an oil filter problem?
I haven't really seen any issues talked about on the LLY engines. That's where I was thinking of a pressure relief mechanism or a check valve of some sort that could be clogged or stuck open.
I haven't really seen any issues talked about on the LLY engines. That's where I was thinking of a pressure relief mechanism or a check valve of some sort that could be clogged or stuck open.
I dont see how. I would try oil and filter first. Sadly I know 2 guys with the same issue as you, main bearings were shot....
CRAP! For some reason I have been thinking about main bearings as well. How would I know if it is main bearings? It doesn't make any noises or run rough. It has never been a tow vehicle for a giant trailer. It does have the Banks kit on it and the previous owner and myself tend to have a heavy foot from time to time.
Bustedknuckles, were the two that you are aware of the LLY engine?
Bustedknuckles, were the two that you are aware of the LLY engine?
If it is main bearings what will I notice? Vibration? Weird noises?
Are there any oil pump issues?
Thanks for your input. Are there any support groups sections on this forum? If I need main bearings in my 'new to me' bitchin new truck I will definitely need a therapy session or two. LOL
Are there any oil pump issues?
Thanks for your input. Are there any support groups sections on this forum? If I need main bearings in my 'new to me' bitchin new truck I will definitely need a therapy session or two. LOL
Sorry, Im not a real internet buff so it took me a while to come back to report the GOOD news.
When I said that the oil pressure had been verified with a manual gauge I was incorrect. The oil pressure switch had been replaced which gave the same low reading on the dash and through the computer. With a mechanical gauge it had 20psi at idle when hot. My mechanic then looked deeper at the wiring and connections in that circuit and found a bad connection that was causing resistance making the dash read lower than what the sending unit was actually reading.
I have been driving the truck now for quite a while with no further issues! I LOVE my new truck!
When I said that the oil pressure had been verified with a manual gauge I was incorrect. The oil pressure switch had been replaced which gave the same low reading on the dash and through the computer. With a mechanical gauge it had 20psi at idle when hot. My mechanic then looked deeper at the wiring and connections in that circuit and found a bad connection that was causing resistance making the dash read lower than what the sending unit was actually reading.
I have been driving the truck now for quite a while with no further issues! I LOVE my new truck!
