i just changed the spark plugs in my 92 cougar 3.8.I had to idle it up so it would stay running in drive.Now when I drive it for about 30 minutes or so.It seems to hesitate when I try to accelarate.What could be the problem?

Asked by dooba Jul 13, 2016 at 02:06 PM about the 1992 Mercury Cougar LS Coupe RWD

Question type: Maintenance & Repair

I've changed plugs,and air filter.Getting poor accelaration

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Auto_Centric answered 7 years ago

Few possibilities scan it for DTC codes as a start. OBDII port

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dooba answered 7 years ago

so changing the wires will help me with my idiling problem and bad acceleration?

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firebird338 answered 7 years ago

Did you check the gap on the spark plugs before installing them ? I know that plugs are pre gapped to fit most vehicles they go to but sometimes they need to be gapped for certain vehicles.

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Bob answered 7 years ago

1992 Cougar with a 3.8 is NOT distributorless ignition. I would look at the distributor cap, rotor and sparkplug wires first. How many miles on this Cougar?

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dooba answered 7 years ago

it's over 150.000 miles on it.Someone said it could be the fuel filter.I've never changed it.And I had the car over 10yrs.

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Bob answered 7 years ago

If it were mine I would change plugs, wires, distributor cap, rotor and fuel filter. I am not saying this will solve your problem. The 3.8 engine also had many issues with head gaskets. I personally repaired bad head gaskets on a 1993 Cougar we owned many years ago. Keep us posted on what you find the problem to be.

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dooba answered 7 years ago

i did have to repair the heads a couple yrs ago.I repaced the disrtibutor cap,rotor about 2 mnths ago.So I'll try the wires and the fuel filter.Thanks

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i just changed the spark plugs in my 92 cougar 3.8.I had to idle it up so it would stay running in drive.Now when I drive it for about 30 minutes or so.It seems to hesitate when I try to accelarate.What could be the problem? 7 Answers

I've changed plugs,and air filter.Getting poor accelaration

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i just changed the spark plugs in my 92 cougar 3.8.I had to idle it up so it would stay running in drive.Now when I drive it for about 30 minutes or so.It seems to hesitate when I try to accelarate.What could be the problem?

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i just changed the spark plugs in my 92 cougar 3.8.I had to idle it up so it would stay running in drive.Now when I drive it for about 30 minutes or so.It seems to hesitate when I try to accelarate.What could be the problem?

7 Answers

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