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1991 Mercury Other bad stalling in idle

Tiny
CARWHELP
  • MEMBER
  • 1991 MERCURY
Basically. I wanted to clean my throttle body on my 1991 mercury grand marquis. I detached everything from the throttle body, and undid everything only to find it was too stuck to remove without me changing breaking everything. So I put everything back o to possibly do another day, only to find th at my car runs much worse than before!
Every time I start it, it idles really high and then just putters out. I did break a little orange hose and I don't see where this connects. I need help!
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Saturday, October 12th, 2013 AT 11:05 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
Sounds like that's a vacuum hose. A vacuum leak will cause a high idle speed. Also, on any car other than a Chrysler product, air sneaking into the engine that doesn't go through the mass air flow sensor will not get measured, and the amount of fuel commanded by the Engine Computer will not be correct. Stalling and poor performance will result.

There's a sticker under the hood that shows the vacuum hose routing. You can use that to see where the broken hose goes to. If that hose is hard plastic, it can spliced or replaced with a piece of rubber hose.
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Saturday, October 12th, 2013 AT 1:19 PM

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