I need advice on oil pressure Please - Forums at Modded Mustangs
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post #1 of 23 Old March 28th, 2015, 09:12 PM Thread Starter
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I need advice on oil pressure Please

I just did a 4V swap on my 02 GT. I removed the 4V from the 97 Mark 8 myself. I started the car numerous times and ran it by spraying fuel into the intake to listen for knocking noises. The fuel pump was bad in the lincoln. I just tried to start my GT and I have no oil pressure. I have fuel and spark but the engine wont run. I pulled the oil pressure sensor and spun it over and not a drop came out of the port. I lowered the stock pick up tube by an inch so I know it was submerged in oil. Could this oil pump just no work all of a sudden??
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post #2 of 23 Old March 28th, 2015, 09:29 PM
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What oil pump are you using? Is this the one that was already on the used mark engine or the one from your GT?

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post #3 of 23 Old March 28th, 2015, 09:53 PM Thread Starter
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I used the mark pump and pick up tube. Mark oil filter adapter. I just cant believe I have zero oil pressure.
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post #4 of 23 Old March 28th, 2015, 11:48 PM
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You could have lowered it too much and it might not have any clearance between the suction and bottom of the pan. There is a spec on how much clearance needed. I would have a book somewhere but I'm not sure where it's at. Joys of still unpacking. Lol

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post #5 of 23 Old March 28th, 2015, 11:59 PM
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You should use the GT's pickup tube.

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post #6 of 23 Old March 29th, 2015, 12:09 AM
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I agree it could be a clearance issue.
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post #7 of 23 Old March 29th, 2015, 09:30 AM Thread Starter
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The sump 3/4 inch from the bottom. It clears fine. I think the oil pump has just completely stopped pumping. with me spraying fuel into the throttle body I guess I just bypassed the no oil pressure signal by putting fuel into it. The sensor must tell the computer to inject fuel is why it wont crank now. I am wondering no how the sensor references the computer. Does it show ground when pressure is applied. I would like to make it fire once to make sure my wiring is ok before I pull this motor and go through it.

---------- Post added at 08:30 AM ---------- Previous post was at 08:23 AM ----------

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You should use the GT's pickup tube.
GT's pickup tube wont fit the mark oil pump. Its too small.

I simply used a longer bolt and a spacer and moved the pickup tube lower into the pan. Its not on the bottom about 3/4 inch from the bottom.
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post #8 of 23 Old March 29th, 2015, 09:32 AM
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If you think its a computer issues clear the computer. As far as the oil pump it is mechanical so not a lot to go wrong a couple things come to mind for me..

Did you put the O ring back on the oil pickup tube where it bolts to the pump? If not your not sealing off enough to create a good suction.



Your not going to get oil pressure turning over a motor It physically has to be running, And if you have not primed the oil system yet you will not get any oil pressure.


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post #9 of 23 Old March 29th, 2015, 09:54 AM Thread Starter
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Quote:
Originally Posted by SSG Pate View Post
If you think its a computer issues clear the computer. As far as the oil pump it is mechanical so not a lot to go wrong a couple things come to mind for me..

Did you put the O ring back on the oil pickup tube where it bolts to the pump? If not your not sealing off enough to create a good suction.



Your not going to get oil pressure turning over a motor It physically has to be running, And if you have not primed the oil system yet you will not get any oil pressure.
I believe this might be my problem. I dont know how long the engine sat in the mark 8 before I bought it. I didnt know I had to prime the system. I never removed the pick up tube only lowered it. I guess Im gonna get a cheap garden sprayer and adapt it to 1/4 NPT and try priming it.
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post #10 of 23 Old March 29th, 2015, 09:57 AM
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You'll need to also make sure your o ring is installed if you cant remember, and your clearances are correct between the pan and pickup which it sounds like you already checked.


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post #11 of 23 Old March 29th, 2015, 03:13 PM
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do you come to the conclusion that you have no oil pressure because of the factory gauge?

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post #12 of 23 Old March 29th, 2015, 06:59 PM Thread Starter
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Update...
I bought a cheap pump sprayer and a 1/4 air hose repair kit from home depot. I piece of rubber hose clamped on the nozzle and the other end to the oil pressure port. It took about 15 to 20 mins to pump 5 quarts into the motor. I slowly rotated the crank as it pumped in. After it all went in. I poured in the last qurat and put the sensor back in. Turned the key on and the gauge read pressure before I even cranked it. I spun it over and it wouldn't crank again. Fuel pressure is steady at 45 psi. I pulled the plugs just out of curiosity and the gap and wear was huge. Over 100 thousands gap on everyone. I gapped them all to 40 thousands and reinstalled. Motor fired but wouldn't run well. Mass airflow meter doesn't fit in the mark intake tube. I haven't gotten the cold air yet, so on a whim i duct taped the meter to the tube just as a temporary thing to see and the motor fired right up and idled ran great.. starts first time every time now. I don't trust the oil sensor at all so I am going to hook a manual gauge tomorrow and check the actual pressure. If it has pressure then I will continue to get it finished. Thanks for all the help
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post #13 of 23 Old March 29th, 2015, 07:33 PM
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Good deal it sounds like the reason its running rough is because your MAF is displaced not getting a good signal.


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post #14 of 23 Old March 29th, 2015, 07:36 PM Thread Starter
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Originally Posted by SSG Pate View Post
Good deal it sounds like the reason its running rough is because your MAF is displaced not getting a good signal.
Definetly. Do you have any ideas on a mark 8 throttle body to stock gt mass air meter tubing? I have the mark tube and gt tube but only the gt mass air meter
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post #15 of 23 Old March 29th, 2015, 07:58 PM
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Can you post a picture of the TB? I am sure we can find a coupler to adapt it to the GT housing but I cant remember what the TB looks like off hand.


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post #16 of 23 Old March 29th, 2015, 09:09 PM Thread Starter
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Best pic I have at the moment


---------- Post added at 08:09 PM ---------- Previous post was at 08:01 PM ----------

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post #17 of 23 Old March 29th, 2015, 09:52 PM
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ok your going to need to measure that TB and order a silicone couplers that goes from oval to round. I personally don't know what size it takes but with a quick measurements you'll be able to order the right one.


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post #18 of 23 Old March 29th, 2015, 10:35 PM Thread Starter
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Quote:
Originally Posted by SSG Pate View Post
ok your going to need to measure that TB and order a silicone couplers that goes from oval to round. I personally don't know what size it takes but with a quick measurements you'll be able to order the right one.
Ok I will take some measurements tomorrow and order the couplers. Thanks
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post #19 of 23 Old March 30th, 2015, 08:17 AM
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Quote:
Originally Posted by Froush View Post
You could have lowered it too much and it might not have any clearance between the suction and bottom of the pan. There is a spec on how much clearance needed. I would have a book somewhere but I'm not sure where it's at. Joys of still unpacking. Lol
Off the top of my head I think it was either 3/8" or 1/2."

Quote:
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ok your going to need to measure that TB and order a silicone couplers that goes from oval to round. I personally don't know what size it takes but with a quick measurements you'll be able to order the right one.
Another one I think I recall, it should be about 4.25" for the oval TBs. I think most of the adapters are 4.25 to 3.5 or 3.
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post #20 of 23 Old March 30th, 2015, 01:12 PM Thread Starter
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I had some good news this morning. 90 PSI oil pressure at startup on a manual gauge
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