Car engine dies while at red light or standing still...

180

Asked by Dec 28, 2015 at 10:19 AM about the 2002 Mercury Grand Marquis GS

Question type: Maintenance & Repair

I recently changed intake manifold, spark plugs,
coil packs, battery, thermostat, and EGR
recirculation tube. After all of this, my check
engine light is on and continues to flash while
hitting gas and driving. When cranking the car it
acts as if it's about to die down and there is not
much power. The engine doesn't have much power
while driving it,  and will die out at red light or while
standing still. I was asked if my new plugs were
gapped but I'm not certain.  Any suggestions would
be greatly appreciated.

17 Answers

180

This is a 2002 Mercury Grand Marquis by the way.

1 people found this helpful.
139,645

First thing that comes to mind is that there may be something hooked up wrong like vacuum lines. How about the timing?

180

I was told to get the vacuum lines checked. Are these all signs of timing problems?

139,645

Only if it is way off. Was the distributor moved?

180

It was not

180

I used Autolite spark plugs and I was now told that the plugs should have been gapped but the person who put them on for me was not sure if they were gapped, just by inspecting them

139,645

Then a nay on timing. How was it running before you changed the intake? Why was it changed, and back to original intake?

180

The original intake was leaking antifreeze, so I changed it out. Before this it was not cutting off

180

That is why I changed all spark plugs and coil packs

139,645

Auto light spark plugs are normally gaped pretty close to what they are suppose to be, but would double check afterward, don't think that is the problem unless they were way off. Three things to do... check vacuum line routing...take some carb cleaner and spray along the intake gaskets having the engine idle at a steady rpm, and around throttle body, anywhere there is vacuum, if there is a leak the rpm will pick up...and put a scanner on it to see what codes are there, Reading these codes will point you in the right direction. You can post them here so I could analyze these.

180

Yesterday I put it on a machine at autozone and it said replace coils and spark plugs, but I had already done so. I was told the reason that was because the check engine light had not been reset after putting on new coils and plugs.

180

Does it seem as if it may be the timing after giving you all this information

139,645

Ya but was it? If it was reset then there is a new set of codes. Check engine light is on for a reason.

139,645

Never hurts to check the timing. There is a crankshaft sensor and a camshaft sensor. Thats why I'd like to know if there are new codes. These two sensors affect the timing and how the engine runs.

180

The check engine light has not been reset after putting on new coils and spark plugs

180

So do I need to reset it and then put it back on a scanner

1 people found this helpful.
139,645

Codes need to be reset since you did a fix for them. Check out the other things I mentioned above first, It's just that if we had a new set of codes that would point us to the right direction of a fix. I believe you just may have something not hooked up or plugged in, or a vacuum not hooked up right. Don't get hung up on the codes until you do some checking. Resetting the codes is not going to fix the problem.

Your Answer:

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 8 nationwide Grand Marquis listings and the tools to find you a great deal.

Postal Code:

Mercury Grand Marquis Experts

  • #1
    Tracy Hooks
    Reputation
    7,420
  • #2
    Js08016
    Reputation
    2,990
  • #3
    Trippmeister
    Reputation
    2,670
View All

Find great deals from top-rated dealersTM

Search

Related Models For Sale

Used Lincoln Town Car
13 listings starting at $9,995
Used Chevrolet Impala
28 Great Deals out of 787 listings starting at $2,495
Used Ford F-150
186 Great Deals out of 14,414 listings starting at $2,000
Used Ford Mustang
64 Great Deals out of 1,807 listings starting at $6,000
Used Honda Accord
44 Great Deals out of 1,876 listings starting at $590
Used Chevrolet Silverado 1500
100 Great Deals out of 13,664 listings starting at $3,995
Used Chevrolet Tahoe
22 Great Deals out of 924 listings starting at $6,871
Used Ford Taurus
10 Great Deals out of 346 listings starting at $3,468
Used Lincoln Continental
26 listings starting at $35,988
Used Toyota Camry
56 Great Deals out of 1,525 listings starting at $1,550

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. Content will be removed if CarGurus becomes aware that it violates our policies.