1997 Mercury Cougar Recently repaired car, shakes.

Tiny
JESSICAGALIN
  • MEMBER
  • 1997 MERCURY COUGAR
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 103,031 MILES
This vehicle is in fairly good condition. 2 weeks ago, I acquired it after having the fan motor changed, the back right tire replaced, and the oil changed. It was running great. I drove it from where I bought it, Tennessee, to New Orleans where I live. About 370 miles. It ran fine, no troubles.

About 4 days after the trip it began vilently shaking. I had put regular unleaded in the tank, let it get almost down to empty before I refilled it with reg unleaded. Thats when the trouble started. I contacted the previous owner and they informed me that it shakes sometimes when not given mid grade gasoline. Since then, I have put mid grade in it, which has done nothing to improve the shaking.

All of the guages read fine. The knocking/shaking is constant. It gets worse when the A/C is turned on. Previously, the A/C blew extremely cold, now it blows warm sometimes. Basically the shaking has phases: it basically has three-four levels of knocking. At park, A/C off, it doesn't knockas badly. At park, AC on, it knocks. At Drive, A/C off, it knocks a bit, At Drive, AC on it knocks hardest.

The check engine light is on constant, but was when purchased. During the shakes it sometimes flashes.

HELP!
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Monday, September 21st, 2009 AT 11:58 AM

3 Replies

Tiny
RACEFAN966
  • EXPERT
Well lets start with the engine light and see what the car can tell us. Call around to your local parts stores and find one that will do a free scan and have them scan it. Write down the codes and then have them clear the codes. Get back to me with what codes are found and we will take it from there.
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Monday, September 21st, 2009 AT 4:31 PM
Tiny
JESSICAGALIN
  • MEMBER
The codes read as follows:

P0304

Cylinder misfire detected- cylinder number 4

EXPLANATION:
The powertrain control module monitors the crankshaft speed and has detected a misfire.

Probable Cause:
1. Ignition system fault-spark plug(s), ignition wires, coil
2. Vacuum leak
3. Injector fault
4. High or low fuel pressure

P0430

Catalyst efficiency low-bank 2

EXPLANATION:
The oxygen sensors monitor the catalytic Converters ability to store oxygen.

Probable cause:
1. Catalytic converter defective (failure possibly due to # 2, 3 or 4)
2. Engine misfire or running condition
3. Large vacuum leak
4. Engine oil leakage into exhaust-valve guide seals, piston rings.

P1443

EVAP canister purge valve mechanical fault or VMV fault condition.

EXPLANATION:
ECM detected a fuel tank pressure change greater than a minus 7 inches of H2O in 30 seconds with purge less than.02 lbs per minute.

Probable cause:
1. Failed Evap pressure sensor
2. Blocked hose between purge bable and FTP sensor
3. Evap purge valve stuck closed.
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Tuesday, September 22nd, 2009 AT 8:27 AM
Tiny
RACEFAN966
  • EXPERT
Ok good now lets take it one code at a time here. First the P0304 for cylinder 4. I need you to check the plug wire to that cylinder, with a multi meter ohm it and tell me what the ohms are and the length of the wire. Also pull the spark plug and check it is there any oil on it or is it all carboned up and check the gap on it should be.054. Now I need you to unplug the injector to that cylinder and ohm the injector shoud be 11-18 ohms. Let me know what you find here and if all this is good then we will go to the next code.
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Tuesday, September 22nd, 2009 AT 10:27 AM

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