2001 Mercury Marquis weirdest thing happen to me

Tiny
PMYHAL
  • MEMBER
  • 2001 MERCURY MARQUIS
  • V8
  • 2WD
  • AUTOMATIC
  • 70,000 MILES
Hi every one,

I had the weirdest thing happen to me. I took my car to garage to have the radiator flushed.

When I pickup my car it started missing at 40 mph.

The TECH'S change the plugs for me and I know I Have A miss AT 55 MPH ON THE highway still.

I am wondering if flushing out the radiator fluid had something to do with making my car miss?

Pawlo
Wednesday, December 12th, 2007 AT 7:15 PM

12 Replies

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
HArd to say what happened. The source needs to be identified before making judgements.

You have it flushed.A miss turns up at 40 mph. May or may not be related depending on what actions were taken, intentional or accidental. There should be no relationship.

The plugs are changed. Miss moves to 55 mph. Same problem as before, or was a new problem created? Such as a wire not seated, bad plug gap etc.

Need to go back and take someone for a ride, point it out and ask why. A reputable garage will take care of it if on their end. Need to find out why first.
Was this
answer
helpful?
Yes
No
Wednesday, December 12th, 2007 AT 7:23 PM
Tiny
TXBIGBULL
  • MEMBER
  • 2 POSTS
My 2001 Grand MArquis did the same thing. I found that one of the spark plug coils started breaking down due to getting wet. I frequently have a slight miss whenever the engine is cold and maybe has moisture in the air. Hope this helps!
Was this
answer
helpful?
Yes
No
Monday, January 7th, 2008 AT 11:11 AM
Tiny
PMYHAL
  • MEMBER
  • 12 POSTS
I a Purchased a new COIL ON plug (COP) and by the process of elimation by removing each COP and replacing old one with the new one then going out for test drive I found the bad cop.

However, this does not explain way after my antifreeze was replaced I had such noticeable miss. Then they replaced spark plugs it to minor mis to a bad cop # 8 away from the thermostat and heater hoes.

The only I a can figure had something to dowith the coolant sensor being cleaned during flush and it was more sensitive to sending messages back to the CPU saying change your spark plugs and # 8 cop is really bad know, I the CPU can not compensate these bad plugs and cop # 8, since you cleaned antifreeze in the block.

Anyone have comment on :mrgreen: my star track theory
Was this
answer
helpful?
Yes
No
Tuesday, January 8th, 2008 AT 11:19 AM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,750 POSTS
Purely coincidence my friend. These cops fail all the time. Did you notice coolant at the end of the coil? Ive had #4 coil failing because of a light drip from the heater core hose leaking into that cylinder. Cyl #4 is the rear cyl on the passenger side.
Was this
answer
helpful?
Yes
No
Tuesday, January 8th, 2008 AT 11:29 AM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
I'm wondering if the coil had got wet during the flush?

The coolant snesor essentially tells the temperature of the coolant only.
Was this
answer
helpful?
Yes
No
Tuesday, January 8th, 2008 AT 11:32 AM
Tiny
PMYHAL
  • MEMBER
  • 12 POSTS
What is the life span of COP is by years or miles?

How long do COP last.

:
Was this
answer
helpful?
Yes
No
Tuesday, January 8th, 2008 AT 11:39 AM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Some go the life of the car. Not letting the plugs badly worn help prevent failures due to ecessive power needed to fire a worn plug.
Was this
answer
helpful?
Yes
No
Tuesday, January 8th, 2008 AT 11:41 AM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,750 POSTS
I usually see them go bad around 100,000. Some as low as 30,000. Some dont go bad.
Was this
answer
helpful?
Yes
No
Tuesday, January 8th, 2008 AT 11:41 AM
Tiny
PMYHAL
  • MEMBER
  • 12 POSTS
So much for the 100,000 mile tune up interval.
Was this
answer
helpful?
Yes
No
Tuesday, January 8th, 2008 AT 5:28 PM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Santa clause, Easter bunny, tooth fairy. Lol
Was this
answer
helpful?
Yes
No
Tuesday, January 8th, 2008 AT 5:42 PM
Tiny
PMYHAL
  • MEMBER
  • 12 POSTS
Ok i want to drive my car 200,000. problem free.

Should i change out the spark plugs every 60,000 miles and cop at same time. or change out the cop at 100,000.miles.

back in the olden days 1987 if wanted to run tip top you replaced wires , rotor cap and plugs ever 24K for top performace.

In the case of the newer cars with 100,000 miles tune ups no wires rotor and cap. just cop and plugs what do you recommend or seasoned tech would recommend for tip top performaring moderen car for cop plugs


https://www.2carpros.com/forum/automotive_pictures/67757_grad01_1.jpg

Was this
answer
helpful?
Yes
No
Tuesday, January 8th, 2008 AT 7:55 PM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
HEH, HEH. IF your talkin going another 130,000 problem free, were venturing back into the make believe. Lol.

If it were mine.

I wouldn't do anything with the cop unless there was a problem. Plugs about 60,000-80000 dependng on wear. The long life plugs are much better than there were. But I have seen them lose performance early sometime.

Fuel filter and transmission filter every 30,000.

Differential at 50,000.

Coolant flush every 3 years.

I don't think that has a cabin air filter, if it does every 30,000.

PCV when its a litle gummy

Tire rotation every other oil change

Oil every 3000

Power steering fluid and brake fluid when it discolors.

Plan on budgeting about 10-15 cents for repairs and maintenance and you'll probably be okay.
Was this
answer
helpful?
Yes
No
Tuesday, January 8th, 2008 AT 8:58 PM

Please login or register to post a reply.

Related Engine Misfire Content

Intermittent Misfire
VIDEO
Intermittent Misfire
Instructional repair video
Misfire Random Code P0300
GUIDE
Misfire Random Code P0300
The world of automotive diagnostics can be complex, with numerous codes and potential issues to keep track of. One of the more common engine diagnostic codes is P0300, which...
VIEW MORE