Cougar 4.6 V8 - Engine Troubleshooting


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Cougar 4.6 V8

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brightone
New User

Jan 21, 2009, 10:14 PM

Post #1 of 4 (1210 views)

Cougar 4.6 V8	Sign In

1994 Mercury Cougar 4.6 V8. New fuel pump, filter,EGR valve,and related parts. Car starts and idles but starts to run rough then dies when comes off cold start or when you try to increase RPM. Checked computer and ingition module all OK. Has spark and fuel.

autojoe
User

Jan 22, 2009, 1:18 AM

Post #2 of 4 (1205 views)

Re: Cougar 4.6 V8	Sign In

what condition are the plugs and wires?Maybe too lean condition.Does it stall in open or closed loop?How long does it take to stall?Will it stall if you dont touch the gas pedal?check engine light ever came on?it may have fuel but not enough.can you keep car running with carb spray or propane?That would tell you if it was a lean condition.Do you have a scan tool?how does car start......right away or take a few cranks?

brightone
New User

Jan 22, 2009, 7:11 AM

Post #3 of 4 (1200 views)

Re: Cougar 4.6 V8	Sign In

Plugs and wires are new. It will run for 5 or 6 minutes before stalling if you don't touch the gas pedal, stalls as soon as you do touch the gas. Check engin light is not on and my code reader finds no codes. Smells like gas when it starts running rough, and when you pull the plugs they are wet with gas, so I it is not a lean condition. Car starts right up when cold but after stalling it will not re-start. Have installed new fuel pump, filter, pressure reg, plugs, wires and coil packs. Will not keep running when ether is sprayed into intake.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jan 22, 2009, 7:40 AM

Post #4 of 4 (1197 views)

Re: Cougar 4.6 V8	Sign In

Hi,

Seems the engine is always being told it's cold which might be a connection or the sensor. A way to check it is at this link....

http://www.autozone.com/...eId=0900c1528006b830

It's not that expensive and very well might be it but my guess is more likely a connection as I don't hear of many on these engines failing?? Unlike some other makes this part is called "engine coolant temp sensor" or ECT for short. It's a maybe??

T

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