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Car shutting off at idle after replacing spark plugs


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slimmer6
New User

Feb 21, 2018, 5:07 PM

Post #1 of 6 (455 views)
Car shutting off at idle after replacing spark plugs Sign In

2002
Mitsubishi
Lancer
180000 miles

Hi,

As the title states, I just replaced my spark plugs and now my car sputters and turns off at idle. A little background, I replaced my spark plugs six months ago, and just yesterday got a code again that they were misfiring. I think this is due to multiple factors including that my engine burns oil, and I believe I have an exhaust leak (can smell it). Working on fixing the exhaust leak, but I'm wondering why my car is turning off at idle since it's a much more immediate problem.

Any help is welcomed.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Feb 22, 2018, 3:10 AM

Post #2 of 6 (423 views)
Re: Car shutting off at idle after replacing spark plugs Sign In

Did you use exact correct plugs?
Mostly questions for you. How do you know it's "burning oil" not just leaking it? If really getting oil into combustion then suddenly burning that off IDK but so much oil burning all at once could just throw whole system off, sensors, converter weak or plugged up. Can't allow the exhaust leak either alone a cause to stall.


What did old plugs (6 mo. old look like + hope you marked which came from what cylinder! Check that one if an oily plug, fouled horribly came out focus on that but after sealing exhaust leak.


Codes! You must have many to confuse the diagnosis now probably time to do a full compression test by the book get a clue if this engine has too much wear or what.


Last: Oil "burning" or consumption that's excessive suggests you've run way too low once or more already the wear when oil pressure drops out is fatal if this was new.
Check away but you might have passed the useful life of this engine?


T



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 22, 2018, 3:11 AM

Post #3 of 6 (421 views)
Re: Car shutting off at idle after replacing spark plugs Sign In

First eliminate all vacuum or air leaks in the system (very important)

. You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
Ultimate Carjunky / Moderator
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Feb 22, 2018, 5:32 AM

Post #4 of 6 (407 views)
Re: Car shutting off at idle after replacing spark plugs Sign In

What is the code number? What did the old plugs look like when you pulled them out? Did you replace the plug wires and coil boots? Is there oil down in the spark plugs wells? How much oil does it consume?





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flat rate mechanic
User
flat rate mechanic profile image

Feb 25, 2018, 3:10 PM

Post #5 of 6 (314 views)
Re: Car shutting off at idle after replacing spark plugs Sign In

Would definitely need more info. If you keep your foot on the gas a little will the car stay running?

(This post was edited by Hammer Time on Feb 25, 2018, 3:11 PM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 25, 2018, 3:12 PM

Post #6 of 6 (308 views)
Re: Car shutting off at idle after replacing spark plugs Sign In

Your signature needs to go. You can't advertise your business here.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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