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post #1 of 3 (permalink) Old 12-28-08, 08:16 AM Thread Starter
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1991 Cougar 5.0 low power.

Hello everyone. Im having a problem with my wifes DD. 1991 5.0 Cougar. Last week it developed a low power problem. Came on suddenly. Car will not accelerate from a stop. Have to put your foot to the floor to get her moving. Once shes rolling and comes out of first gear she's not to bad but still down on power. Trans is not slipping, holds at full throttle and even on wet grass this thing wont break the tires loose. Feels like its starting a gear or two high. I have checked the air filter, MAF, the fuel pump and regulator are new, the engine runs fine with out a load on it, I checked the codes and got four codes. 157 and 158 for the MAF high and low, probably occured when i unplugged the MAF with it running. 332, egr valve but its had that code for a long time, and a PIP fault. I checked the distributor shaft and while its all intact it does seam to have some play. couild it have jumped a tooth on the cam and be out of time? I also plan to check the TPS and the coolant temp Sensor. A friend suggested plugged cats but it came on suddenly like a part failed not gradual so im thinking probably not. Its a 3 speed with OD automatic, did they have lockup converters and could it be stuck locked?? At this point i just need some other ideas of possible problems to check. Thanks in advance for your help....Shawn

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post #2 of 3 (permalink) Old 12-29-08, 08:49 AM
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Re: 1991 Cougar 5.0 low power.


You should post this at:TCCoA.com - Thunderbird & Cougar Club of America
Thunderbird & Cougar car Club of America
This club specializes in 89 to 97 Thunderbirds & Cougars


Paul tbirdtess
1990 Thunderbird Factory stock Circle Track Car #12
351W C4 3.90 open gear.
See my car at:www.tessier-racing.com
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post #3 of 3 (permalink) Old 01-01-09, 10:40 PM
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Re: 1991 Cougar 5.0 low power.

I had a 1990 Cougar and i could barely get the thing past 20mp but when i did it was better slightly.Turned out to be a broken disc pad that got stuck between the rotor and calipar.Thing was it didnt shake or have stopping issuse.Sometimes its not even engine problems.Just a suggestion.Also when flooring it does your R.P.M's go up and/or you hear a clunk when you finally do get it engaged?

Last edited by thundercougar; 01-01-09 at 10:46 PM. Reason: left things out
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