What causes my Merc to not idle after short trips and bog down going up steep hills?
105

Asked by Msfixit12 Jun 05, 2017 at 09:22 AM about the 1989 Mercury Grand Marquis LS Sedan RWD

Question type: Maintenance & Repair

It idles fine when first started. After driving and parking, it won't idle when I
restart. Once I park it over nite, It  starts and idles fine again. Also, after a long
day of starts and stops, it bogs down on steep hills.

3 Answers
5,295

Trippmeister answered 6 years ago

Do a scan, or have one done. Could be you need to clean or replace the MAF sensor. Could be TPS sensor. Maybe valve body dirt, or clogged passages. There are guys on here who know more. Also check fuel pressure.

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105

Msfixit12 answered 6 years ago

Update: It turned out to be the Idle Air control Valve. Just had to remove and give it a good cleaning to remove the carbon. Thankx for taking the time to try to help.

1 people found this helpful.
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