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Replace the oil pressure switch but it still come on when I stop

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Double check to see if you have enough oil in the crankcase.

Posted on May 07, 2015

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Where is the oil sending unit on a 1996 mercury cougar xr7 ? Its cause my oil pressure gauge is bouncing up and down...i dont know why...can anybody please help me thank you so much


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The low oil pressure warning lamp will illuminate anytime the ignition switch is turned to the ON position without the engine running. When the engine is running, the light also illuminates if the engine oil pressure drops below a safe oil pressure level. To test the system, perform the following:
If the oil pressure light does not work, perform the following:
  1. Turn the ignition switch to the ON position.
  2. If the lamp does not light, check for a broken or disconnected wire around the engine and oil pressure sending unit switch.
  3. If the wire at the connector checks out OK, pull the connector loose from the switch and, with a jumper wire, ground the connector to the engine.
  4. With the ignition switch turned to the ON position, check the warning lamp. If the lamp lights, make sure the oil pressure switch is properly grounded in the cylinder block, and if so replace the oil pressure switch. If the lamp still fails to light, check for a burned out lamp or disconnected socket in the instrument cluster.
To diagnose an oil pressure light that stays on, perform the following:
  1. Check the engine oil level and top off as necessary. If the engine was 2 or more quarts low on oil, test start the engine after topping off the oil level and recheck the oil pressure light operation. If the light stays on, stop the engine immediately and go to the next step.
  2. Disconnect the wire at the sending unit, then turn the ignition switch to theON position. If the light remains on, check the wire from the sending unit to the gauge for being shorted to ground and repair as necessary. If the light goes out, turn the ignition switch OFF and go to the next step.
  3. Replace the oil pressure sending switch with a known good switch.
  4. Start the engine and check the oil pressure light operation. If the light stays on with the engine running, stop the engine immediately to avoid severe engine damage until the cause of the problem can be determined.

WARNING
If the oil pressure light remains on while the engine is started, stop the engine immediately. Do not operate the engine until the cause of the problem can be determined. Operating an engine with low oil pressure will cause severe internal damage.

Possible causes for an oil pressure light to stay on are:


Pinched or grounded sensor wireDefective oil pressure sending unitRestricted or severely leaking oil filterExcessive internal engine bearing clearance.Insufficient or severely contaminated engine oilBlocked oil pump pickup screen or severely worn oil pump

Mar 31, 2016 | Mercury Cars & Trucks

1 Answer

Low oil pressure when idling


A mechanic would either replace the switch or check oil pressure with a mechanical gauge to verify.

Feb 01, 2014 | 1993 Dodge Dakota

1 Answer

I have a 2002 jeep grand cherokee lerado with a 4.0 my oil pressure is normal when i drive but when i stop my pressure goes low


A low oil level will cause this. If the oil level is fine, then you need to have a mechanical gauge to verify the pressure is really low and that you don't have a bad oil pressure switch. You could try replacing the switch first if you don't want to put an oil pressure gauge in the vehicle. If the pressure is indeed low and the oil level is normal then replace the oil filter to see if that brings the pressure back up. If the pressure is still low, remove the oil pan to check the pick-up tube for debris. If it is clear of debris then you'll be needing to replace the oil pump. Another possible cause of low pressure is a damaged rod or main bearing and would require the engine to be rebuilt.

Jul 15, 2011 | 2002 Jeep Grand Cherokee

1 Answer

Where do i find the oil pressure switch on the toyota tarago is there one or to I replaced the one on the side of the motor near the starter motor but the red oil light is still coming on


First, do not keep driving if the oil warning light is on or your oil pressure gauge has dropped. Stop the engine, let it sit for a few minutes, then check the oil level.
If the dipstick shows a full oil level, then low oil obviously isn't your problem. The oil pressure may be low because of a worn or broken oil pump, a plugged oil pickup screen in the engine's crankcase, possibly a plugged oil filter or excessive bearing wear. Or, the oil pressure may be fine but the oil pressure sending unit has failed. Further diagnosis will be required to determine what's wrong.
Perform electrical tests on oil pressure switch http://www.clarks-garage.com/shop-manual/elect-19.htm
Replace pressure switch as the cheapest means of repair to see if the lights go out .
The pressure switch will be located on the engine block.

May 01, 2011 | Toyota Passenger Cars & Trucks

1 Answer

1997 Mercedes 300E diesel, 186K. Multiple instances of Check Engine Lights, Oxygen sensor replaced 2x. Engine has stopped unexpectedly while driving, 2 codes (Check Oil Pressure & ETS) , alternator...


Try or (have your mechanic) remove oil pressure switch and clean. They gum up and it's a safety feature that when car is in accident and/or roll over, when oil pressure drops (eng quits) power to fuel pump shuts off. Sticking oil pressure switch is common on Benz Diesels

Feb 26, 2011 | 1990 Mercedes-Benz 300 Diesel

1 Answer

Oil light comes on(no oil pressure pull over and stop turn off car)


This will indicate that there may be some sludge build up in the block, or the oil pressure switch is damaged. The more serious issue will be a failing oil pump. To isolate the issue, simply, have a oil pressure test ran on this engine. If the test indicates that the true oil pressure is optimal at idle, kindly replace the oil pressure switch. Now, if the test proves that the pressure is indeed lower than factory specifications, this will confirm that the pump is damaged. Have the pump, and oil pump screen replaced, in this case.

NOTE_ I would, also, recommend to have the engine flushed asap.

Jun 17, 2010 | 2000 Volvo S40

1 Answer

Oil light blinks and chimes when I come to stop. It stops blinking and chiming when I accelerate. I have changed the oil and know it is full.


the oil pressure switch may need replacing or youre oil pressure is low check the oil pressure switch first if it is leaking oil at the switch this will cause the problems

Nov 19, 2009 | 1997 Dodge Caravan

2 Answers

LOST OIL PRESSURE IN A 97 s10 AND IT WONT START


Do you have oil pressure now, if not the oil pressure switch cuts power to the fuel pump to stop engine damage

Jul 18, 2009 | 1997 Chevrolet S-10 Pickup

1 Answer

Oil pressure gauge drops to zero when stopped


The Oil Pressure switch is notorious for going bad on Dodge truck. I recently change out my oil pump on a 5.2 L engine only to find that I had a faulty switch. The switch for a 5.2L is only 16.99 at autozone and is less time consumming than replacing the oil pump.

Jul 19, 2008 | 1994 Dodge Ram

1 Answer

01 grand cherokee fan relay/oil pressure


I don't know if this will help anyone, but i had a issue with my jeep running hot and check engine light coming on as well. After alot of trips to different shops - the last one found that there were two senors in the engine for the fan that need to be changed. Everyone would aways fine the one up top but not the second one. After that, have not had any other problems like it since.

Jun 17, 2008 | 2001 Jeep Grand Cherokee

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