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

25

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

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

1,335

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.

25

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.

1,335

I should have thought of that the IAC. Thanks.

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