Why do my plugs keep fouling?

5

Asked by Mar 09, 2017 at 03:00 AM about the 1987 Chrysler Fifth Avenue Base

Question type: Maintenance & Repair

I have changed coil, plugs, wires, cap and rotor. my fuel economy went from
20mpg to 15mpg , my plugs keep fouling

4 Answers

104,235

So judging by your loss in mpg it sounds like it's running very rich, have you checked the codes to see if they lead you somewhere? Could be fuel pressure regulator, O2 sensors, map sensor, one or more of the temp sensors, even a wiring issue, you may need to take it too a shop that has some of the old equipment for the old Chrysler system.

54,535

What do the plugs look like when they are fouled? Are the plugs oily wet or sooty wet. Does the car use any engine oil. How many miles on the vehicle? As tennisshoes said above it could be many different things.

5

the plugs are sooty dry fouled, 57k original on engine, oil is good

104,235

Yep way too rich, getting the codes would be the first thing too do.

Your Answer

Fifth Avenue

Looking for a Used Fifth Avenue in your area?

CarGurus has 8 nationwide Fifth Avenue listings and the tools to find you a great deal.

ZIP:

Chrysler Fifth Avenue Experts

  • #1
    alicat3373
    Reputation
    70
  • #2
    Charlie Denbigh
    Reputation
    40
  • #2
    nazar
    Reputation
    40
View All

Related Models For Sale

Used Cadillac DeVille
3 Great Deals out of 1,511 listings starting at $1,999
Used Dodge Charger
338 Great Deals out of 30,091 listings starting at $2,000

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.