High Oil Pressure in 1999 FD
Thread Starter
Full Member
Joined: Dec 2024
Posts: 62
Likes: 6
From: Houston Texas
High Oil Pressure in 1999 FD
I couldn't find any specific threads on what would be too high for oil pressure. Online I get conflicting information and I assume that something is wrong with oil pressure this high. After installing an Oil pressure gauge it has always shown over 100psi after 3k RPM. Idling it is around 45PSI, which I assume is normal. Can anyone point to some troubleshooting tips I can look at? Not sure how difficult it is to replace or inspect the oil pressure relief valves, but I would suspect them first, or something else? The engine has 40k miles on it, but not sure that makes a difference since it is over 25 years old. Any assistance would be greatly appreciated~!
Your oil pressure readings are within the range of what we've seen. 0-150psi should be the range for oil pressure sensors and gauges on our cars since 100+ psi is not uncommon for cold starts.
My oil pressure on my '99 usually pegs out at high revs. Freaked me out the first time that happened. This was after it was discovered my oil pan was dented up against oil uptake, restrictimg my pressures to under 50 psi, and that problem was fixed,
(Lesson: don't ignore a dented up oil pan.)
On an unrelated matter. As an owner of a "99, are you aware that the coil position was changed by Mazda after late 1995?
Best look into it to prevent getting your coils harness or plug leads hooked up in the wrong order by an unsuspecting mechanic.
(in fact, go out and check it now.)
(Lesson: don't ignore a dented up oil pan.)
On an unrelated matter. As an owner of a "99, are you aware that the coil position was changed by Mazda after late 1995?
Best look into it to prevent getting your coils harness or plug leads hooked up in the wrong order by an unsuspecting mechanic.
(in fact, go out and check it now.)
Thread Starter
Full Member
Joined: Dec 2024
Posts: 62
Likes: 6
From: Houston Texas
My oil pressure on my '99 usually pegs out at high revs. Freaked me out the first time that happened. This was after it was discovered my oil pan was dented up against oil uptake, restrictimg my pressures to under 50 psi, and that problem was fixed,
(Lesson: don't ignore a dented up oil pan.)
On an unrelated matter. As an owner of a "99, are you aware that the coil position was changed by Mazda after late 1995?
Best look into it to prevent getting your coils harness or plug leads hooked up in the wrong order by an unsuspecting mechanic.
(in fact, go out and check it now.)
(Lesson: don't ignore a dented up oil pan.)
On an unrelated matter. As an owner of a "99, are you aware that the coil position was changed by Mazda after late 1995?
Best look into it to prevent getting your coils harness or plug leads hooked up in the wrong order by an unsuspecting mechanic.
(in fact, go out and check it now.)
BTW Nice to meet some 99 FD owners!
I see I mentioned this before in a earlier thread of yours.
Here is a thread discussing the coil position change.
Click on some of the links in that thread as well, for more detail.
Congeatulations on your '99. I see the prices in Japan continue to move up for "S8" cars.
Might slow down the number of newly imported ones into the US.
Here is a thread discussing the coil position change.
Click on some of the links in that thread as well, for more detail.
Congeatulations on your '99. I see the prices in Japan continue to move up for "S8" cars.
Might slow down the number of newly imported ones into the US.
Trending Topics
Thread Starter
Full Member
Joined: Dec 2024
Posts: 62
Likes: 6
From: Houston Texas
I see I mentioned this before in a earlier thread of yours.
Here is a thread discussing the coil position change.
Click on some of the links in that thread as well, for more detail.
Congeatulations on your '99. I see the prices in Japan continue to move up for "S8" cars.
Might slow down the number of newly imported ones into the US.
Here is a thread discussing the coil position change.
Click on some of the links in that thread as well, for more detail.
Congeatulations on your '99. I see the prices in Japan continue to move up for "S8" cars.
Might slow down the number of newly imported ones into the US.
A sudden change in the runability of your car may point to that problem.
People working on the car for other reasons, may disconnect things to make room to work, then lazily rehook the leads in the wrong order.
This has happened to me on several occassions.
People working on the car for other reasons, may disconnect things to make room to work, then lazily rehook the leads in the wrong order.
This has happened to me on several occassions.
I have a 0-150psi pressure sensor on my car, the data gets logged by the ECU. I wouldn't be surprised to see 105-110 psi at idle when the engine is very cold, or at high RPM when the engine is warm. The 0-150psi gauge would be a good choice.
Thread
Thread Starter
Forum
Replies
Last Post