No Oil Pressure On Cold Start???? Knock Knock Knock Knock!! Help

C

cturboaddict

Founding Member

Jul 14, 2002

268

7

18

Collinsville, IL (Previously South Jersey)

Aug 5, 2003

#1

• Aug 5, 2003

• #1

ok, for the past week ive been noticing a disturbing trend!
When i first start my car up in the morn, everything is fine, but after driving to work~ when i start it up for lunch the oil pressure gauge reads nada, and you can here the motor knocking for about 3 sec. then the needle pops up and the knock goes away!
Park the car after lunch, when i start it up to go home, it does the same thing! BUT if im driving the car somewhere and shut it off to go in a store or something, when i come back out IT DOESNT DO IT???? First thing in the morn IT DOESNT DO IT?????
Whats the deal?

 

MustangPunk302

Founding Member

Sep 11, 2002

1,051

0

36

West Michigan

Aug 5, 2003

#2

• Aug 5, 2003

• #2

You check your oil?

 

P

pnawang

Founding Member

Sep 21, 2002

87

0

0

Aug 5, 2003

#3

• Aug 5, 2003

• #3

sounds like lack of oil pressure or the oil pump is on it way out. how
many miles on the engine? maybe time for a rebuild. good luck

 

C

cturboaddict

Founding Member

Jul 14, 2002

268

7

18

Collinsville, IL (Previously South Jersey)

Aug 5, 2003

#4

• Aug 5, 2003

• #4

yes, ive checked the oil, its fine! Burns a little here and there but its nothing much!
Motors got 110,000 on it now!

 

MustangPunk302

Founding Member

Sep 11, 2002

1,051

0

36

West Michigan

Aug 5, 2003

#5

• Aug 5, 2003

• #5

I bet there's something messed with your oil pressure sending unit.

 

F

forced88lx

New Member

Jun 3, 2003

252

0

0

Aug 5, 2003

#6

• Aug 5, 2003

• #6

Go replace your oil pump. Theres nothing wrong with your sending unit.

This is what happens:

When the car is cold the metal/seals in your oil pump SHRINK. Thus the suction of the pump is terrible. Once the oil gets hot, the pump seals swell and it acts fine.

So When you go to the store and start your car, it's seals are already swollen and it operates fine, however if you let the car sit for hours, you dont have startup oil pressure.

The knocking you are hearing is your lifters

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

34

129

Aug 5, 2003

#7

• Aug 5, 2003

• #7

forced88lx said:

Go replace your oil pump. Theres nothing wrong with your sending unit.

This is what happens:

When the car is cold the metal/seals in your oil pump SHRINK. Thus the suction of the pump is terrible. Once the oil gets hot, the pump seals swell and it acts fine.

So When you go to the store and start your car, it's seals are already swollen and it operates fine, however if you let the car sit for hours, you dont have startup oil pressure.

The knocking you are hearing is your lifters

Click to expand...

that is all well and good, but he says he has good pressure when the car sits all night and goes in the morning. that negates your theory, no???
it may still likely be the pump, but im curious for someone to have an explanation.

 

B

brianmef

20+ Year Stangneter

Nov 19, 2003

138

0

16

Mar 2, 2004

#8

• Mar 2, 2004

• #8

If it knocks, it isn't getting oil. It wouldn't be the oil pressure sending unit. From what I've read here, it's acting normal! No oil pressure = no reading on the gauge = no oil getting to vital parts in the engine = you will eventually ruin this engine if you keep driving it. Take it in to a mechanic. I agree with forced88lx. It's the oil pump.

 

C

cturboaddict

Founding Member

Jul 14, 2002

268

7

18

Collinsville, IL (Previously South Jersey)

Mar 2, 2004

#9

• Mar 2, 2004

• #9

actually it was the fram oil filter! I replaced it, no problem! Next oil change i put a fram in, after a couple months SAME PROBLEM!

 

B

brianmef

20+ Year Stangneter

Nov 19, 2003

138

0

16

Mar 2, 2004

#10

• Mar 2, 2004

• #10

cturboaddict said:

actually it was the fram oil filter! I replaced it, no problem! Next oil change i put a fram in, after a couple months SAME PROBLEM!

Click to expand...

So replacing the filter fixes it for a while and then it does it again? How many miles in between oil/filter changes?

 

C

cturboaddict

Founding Member

Jul 14, 2002

268

7

18

Collinsville, IL (Previously South Jersey)

Mar 2, 2004

#11

• Mar 2, 2004

• #11

trust me when i tell you! Look at how old this post is! after i replaced the fram with a ford motorcraft i had no problem for 3500 miles, replaced it with a fram 1200 miles and it started again!
Its the backflow valve in the filter!
Look it up, you will see similar reports of the same problem!

 

B

brianmef

20+ Year Stangneter

Nov 19, 2003

138

0

16

Mar 2, 2004

#12

• Mar 2, 2004

• #12

cturboaddict said:

trust me when i tell you! Look at how old this post is! after i replaced the fram with a ford motorcraft i had no problem for 3500 miles, replaced it with a fram 1200 miles and it started again!
Its the backflow valve in the filter!
Look it up, you will see similar reports of the same problem!

Click to expand...

I guess I'll stick to Motorcraft then. Thanks for the info. I didn't realize that this thread was soooooooo old. I'm out-a here!