Question about 1986 Mercury Grand Marquis

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86 grand marquis spits and sputters at cruise speed

Upon acceleration and decelertion it stops and starts up again when cruise speed is reached. Tune up did not help

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  • Wayne Holden May 11, 2010

    When is the last time you had the catalytic convertor checked?

  • Dar
    Dar May 11, 2010

    What did the tune up involve? What was replaced? Carb job?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

eitan
  • 291 Answers

SOURCE: engine spits and sputters

check your spark plug wires.

Posted on May 15, 2008

autodr
  • 260 Answers

SOURCE: Car sputters when you accelerate

is the engine lite on? if a misfire shows, and the plugs are new, could be coil or wires. how does it idle? maybe air leak between mass air flow sensor and throttlebody.

Posted on Nov 15, 2008

janinedave37
  • 16 Answers

SOURCE: Wiper blades stop in up position on 1999 Grand Marquis

Its the intermittant/park relay.

Posted on Dec 13, 2008

  • 3 Answers

SOURCE: Rough idle, Car shakes, sputters and misfires upon acceleration

It sounds like you may have a problem feeding the fuel to your engine, I had the same problem with my 89 RS. All the 1989 model's fuel systems were recalled. I think you may need a new fuel pump. The fuel pump is located inside the gas tank in the rear of the car right under the rear axle. The fuel pump itself isn't too expensive, but with other small parts such as the electrical harness upgrade and fuel filter and the labor you should be looking somewhere in the $500 range. I hope this helps.

Posted on Jan 12, 2009

chuck943
  • 783 Answers

SOURCE: Location of blower motor switch resistor on 2004 Grand Marquis

The blower speed controller is located under the hood on the right or passenger side on the heater housing just to the side of the heater hoses near the very back of the right cylinder head.
Yes that would cause the concern you are having.

Posted on Feb 05, 2009

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1 Answer

I have a 1999 Grand Vitara JLX that putters and spit at idle taking off at red lights or stop signs when it's in full speed or at a decent speed it runs fine what could it be?


ever get a tune up this decade.
like new spark plugs? at 30k or 60k miles per the owners guide.?

sputters is misfiring, and is 90% caused by owners never doing service. regular service,
same answer for 100 years, gas engines.
time to get it serviced,

if it it is tuned up.??????
then EGR stuck open, lean it or replace it.
or one or more cylinders are misfiring.
a scan tool is next to see if its 1 cylinder or all cylinders misfiring, and lots more (test wise)
or better yet? ask your mech (tecH) to find cause.

no engine stated. so.... no details. ever.
G16
J20
H25 engines?

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1 Answer

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Could be clog catalytic converter.Tune up fuel filter,coils,air filter.

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Acceleration promlems


Check for fuel supply problems as it sounds that at sustained high speed the fuel supply is not good enough. Possible pump dosen't have enough capacity

Feb 01, 2013 | Cars & Trucks

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How can i minimize the fuel consumption of my jeep 2000 cherouki laredo 6 cylinders ?


There are several things you can do. Make sure the engine is in good tune, replace the air filter, Air the tires up to 34 pounds air pressure to lessen the rolling resistance, How you drive is most important. Take off from traffic light and stop signs slowly. accelerate steady, don't be in a hurry to reach cruising speed, unless, of course, you are merging with fast traffic. Anticipate stops. Start slowing down sooner when coming to a stop sign or traffic signal. Coast on the downhill streets, and use the cruise control as much as possible. Don't waste gas warming up your vehicle in cold weather. It will warm up quickly while you are driving. Any time spent idling is zero miles per gallon.

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Sputters at cruising speeds, but not when floored


have you had you fuel system cleaned? meaning had your injector cleaned?

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to funny, My car an 07 equinox with 52000 miles on it just today started sputtering. I googled equinox sputtering and I came up with this sight reporting the same exact problem-- help

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1 Answer

2006, mercury grand marquis with EATC issue while accelerating.


Hello Bryan,

You either have a horrendous vacuum leak... or a muffler or catalytic converter (collapsing) starting to block you exhaust system...

A decent exhaust shop with code readers ought to be able to tell...

You would most likely be tripping OBD (on board diagnostic)
codes around your fuel system, oxygen sensors... and getting poor power and mileage...

Certainly worth a look...

I was STRANDED twice: once by a muffler... and again 15 years later by a collapsed catalytic converter.

Tow truck time.

Good luck.

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What are the functions of Resume &Coast buttons in steering wheel


If set at a specific speed and you have to slow down by hitting the brakes, The brakes turn off the cruise control. Pressing resume automatically turns the cruise control back on and accelerates to the previous speed setting. You can also use it to accelerate and by releasing it the new speed will be set.

Jun 18, 2009 | 1996 Mercury Grand Marquis

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