Question about 1997 Mercury Cougar XR7

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My 1995 cougar xr7 stalls when it de-excelerates. Also fails to start after engine is shut off.

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My 1995 cougar xr7 stalls when it de-excelerates - idle_air_solenoid_ford.gif

FORD IDLE AIR BYPASS

Ford doesn't use idle air bypass to regulate idle speed on its older throttle body (CFI) applications, but uses a solenoid or vacuum diaphragm instead to open the throttle linkage. Idle air bypass is used only on multipoint injection applications. On older pre-OBD II cars, codes 12, 13, 16, 17 & 19 all indicate idle speed is out of spec (too high or too low). Codes 47 and 48 indicate a fuel mixture problem which could be caused by an air leak. On OBD II vehicles (1996 & newer), codes P505 to P509 indicate a fault with the idle speed control system.

The diagnostic procedure when any of these codes are found is to turn the engine off, unplug the ISC bypass air solenoid connector, then restart the engine to see if the idle rpm drops (it should if the ISC solenoid is working). No change would indicate a problem in the motor or wiring.

The ISC solenoid can be checked by measuring its resistance. With the positive lead of a digital volt/ohm meter on the VPWR pin and the negative lead on the ISC pin, measure the resistance of the solenoid. On many applications, the spec calls for 7.0 to 13.0 ohms. If it is out of specs, the ISC solenoid is bad. Also check for shorts between both ISC solenoid terminals and the case.

If the ISC checks out okay, check for battery voltage between the ISC connector terminals while the key is on. Voltage should also vary when the engine is running. No voltage indicates a wiring or computer problem.

Posted on Aug 13, 2012

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Sounds like a Idle Air control valve. Replace it. By any chance does it need a little pedal to get it started. This is a sign its an IAC valve problem

Posted on Jul 18, 2009

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My 1995 mercury cougar xr7 in the morning the fuel pump runs along time like a couple of minutes befor it shuts off so it will crank,but 5 hours later it cranks up fine.what is the problem?


Can you be more clear? The pump only runs for 2 seconds until the engine starts cranking and then it stops immediately when cranking stops.

Aug 17, 2013 | 1995 Mercury Cougar

1 Answer

97 cougar starts but wont stay running shut s right off


Can be many things. Should have generated a "check engine" light. Which it may have but dies too soon for you to notice.

Check your fuelpump pressure at the fuelrail test tap. Gauges may be available at Autozones' tool loaner program. If you have residual pressure, then an electrical problem exists. For starters, the fuelpump relay may be bad.

Ford uses a 2 computer system in some models. A starting circuit gets the engine going and then after 10-15 seconds the main computer takes over. The second computer could be bad and fails everytime the transfer of operation takes place.

Sometimes the O2 sensors do not provide the feedback the engine controls need to adjust the engine for running. The parts work for the cold start, but when warm, they fail to provide the info the components need to adjust everything and the engine just dies.

The fuelpump could be failing once the initial start is over or the relay is kicking out. That is why measuring residual pressure is important.

Aug 14, 2012 | 1997 Mercury Cougar XR7

1 Answer

What's your problem?i have a 1995 mercury cougar xr7 its the 4.6L v8 model...it was in a ditch during a heavy rain. Car passenger side, was submerged in water about halfway. Water was in the inside on...


somewhere in that area is the ECM so it may need need replacing
check for water in all of the connections inside and in the engine compartment

Jun 26, 2017 | 1995 Mercury Cougar

1 Answer

Were is crankshaft position sensor located on a 95 mercury cougar xr7?


First, if you would like to receive USEFUL information about your vehicle, (ESPECIALLY when you are asking about engine controls) it would be nice if you would mention WHICH ENGINE your vehicle is equipped with!

1995 Mercury Cougar XR7 was equipped with 3 different engines:
3.8L NON-SC VIN CODE [4]
3.8L SC VIN CODE [R]
4.6L V-8 VIN CODE [W]

The crank sensor for both of the 3.8L engines is located at the lower right FRONT of the engine.

The crank sensor for the 4.6L engine is located at the lower right REAR of the engine.

Jan 14, 2012 | 1995 Mercury Cougar

2 Answers

Check engine code 1407


two people told me it was the egr valve
one guy said he replce the hose and it worked for him
I hope this helps

Feb 03, 2009 | 1996 Mercury Cougar XR7

1 Answer

1997 3.8 cougar stalling . no power soon after start up


Try looking for engine vacuum leak,around the injector seals inlet etc.Is the air box lid and hoses tight and leak free?Could also be fuel pressure problem Try squeezing the fiel return line with the appropriate tool so you dont damage it and see wether the engine idles properly.If idles better more than likely fuel pressure problem.

Oct 22, 2008 | 1997 Mercury Cougar XR7

1 Answer

1995 Mercury Cougar XR7


I replaced the ball joints and fixed the problem on mine.

Jun 27, 2008 | 1995 Mercury Cougar

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