1991 Lincoln towncar shakes and backfires while driving

Tiny
VDAWG
  • MEMBER
  • 1991 LINCOLN TOWN CAR
Hi, I have a 1991 lincoln towncar executive with a 4.6 ohc v8 141,000m, I have had this car for 4 years and no problems until now, I was recenlty going to sell the car(it was running fine)so I took it to the car wash to spray down the engine with enginebrite to get at least some of the dirt and oil off, after that I drove it to a gas station and it was still running fine, it drove fine all the way home, I let it sit for about a day, then I went to start it and it started up fine but was now idling a lil rough, I looked at the engine, it looked ok, but when I drove it down the block it started shaking real bad and backfireing(popping) but only when im starting out or going about 5-10 mph, the transmission seems to shift ok, could this be faulty wires?Plugs. Distruibuters? Or something else the exhaust is also spitting out water but I think its always done this. Note:i have cleaned MANY engines this way and this one in the past and have never had a problem. Any help would be greatly appreciated thank you.
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Monday, February 20th, 2006 AT 6:33 PM

3 Replies

Tiny
PEPPERMRJ
  • MEMBER
I would look/listen for a vacuum leak. Sounds like something came loose/off. Check the PCV setup closely.

Good hunting and let us know. :)
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Monday, February 20th, 2006 AT 7:36 PM
Tiny
VDAWG
  • MEMBER
Hey thanks guys, I went ahead and just about pulled my hair out tryin to find somthing wrong :evil: (vacuums/fusable links/modules/etc. Etc.)I pulled the codes and I was getting an egr little or no voltage (345) but that wasnt it, I recently smogged the car, it passed and that wasnt even connected, problem came after. So I decided it had to be the ignition system, I checked the plug wires with a cool lil tester I found at kragen/checker auto for 4 bucks(sweet !) Wires were all fine, but when I pulled the spark plugs, they had been fouled and rusted. Due to me in my infinite wisdom filling the plug holes with water. Although, the plugs should have been properly installed with some sort of anti rust/sieze to seal them, the previous owner did not plus the gap was at.060 not at.054 like they should have been, I was surprized it ran so well like that before, NOTE:be very carefull not to let any WATER! Debris or oils, fall into your combustion chambers, I used an aeresol electronics air duster to clean them out before I took the plugs out because I do not have an air compressor with a hose to blow them clean, anyways, new plugs, problem solved, thank you, hope this helps someone else. God speed
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Thursday, March 30th, 2006 AT 4:24 AM
Tiny
PEPPERMRJ
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Thanxs for the update.

Happy motoring :)
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Thursday, March 30th, 2006 AT 6:20 PM

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