# 94 Explorer runs rough on warm restarts

**URL:** <https://community.cartalk.com/t/94-explorer-runs-rough-on-warm-restarts/13773>\
**Category:** Maintenance/Repairs\
**Created:** [May 8, 2008, 9:59pm UTC](https://community.cartalk.com/t/94-explorer-runs-rough-on-warm-restarts/13773 "2008-05-08T21:59:35Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![dalecarlile](https://avatars.discourse-cdn.com/v4/letter/d/e19b73/32.png) [@dalecarlile](https://community.cartalk.com/u/dalecarlile)\
**Post date:** [May 8, 2008, 9:59pm UTC](https://community.cartalk.com/t/94-explorer-runs-rough-on-warm-restarts/13773/1 "2008-05-08T21:59:35Z")

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I have a great running engine until I need to restart it soon after shutting it off. It will try to run, but very rough. It will not respond to the throttle either. after a few tries over about 10 minutes it will start and run normally. I have changed the plugs and wires, no improvement. Old plugs were all a nicek light almost white color. Car has 110K miles, does not use oil. Where do I start.

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**Author:** ![87\_Ranger](https://avatars.discourse-cdn.com/v4/letter/8/f14d63/32.png) [@87\_Ranger](https://community.cartalk.com/u/87_Ranger)\
**Post date:** [May 13, 2008, 7:57pm UTC](https://community.cartalk.com/t/94-explorer-runs-rough-on-warm-restarts/13773/2 "2008-05-13T19:57:29Z")

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Fortunately checking the fuel pressure on this is only slightly more challenging than checking tire pressure.

There might be a leaking injector or the pressure regulator thats flooding a cylinder or cylinders.

Make sure it holds pressure with the engine off.

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**Author:** ![Opera\_House](https://avatars.discourse-cdn.com/v4/letter/o/9dc877/32.png) [@Opera\_House](https://community.cartalk.com/u/Opera_House)\
**Post date:** [May 14, 2008, 11:33am UTC](https://community.cartalk.com/t/94-explorer-runs-rough-on-warm-restarts/13773/3 "2008-05-14T11:33:41Z")

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The fuel pressure regulator valve seat can wear on these and cause this problem. This can cause a vapor lock situation because the pump only turns on for 5 seconds until the engine starts. Turning the key to ON about every 10 seconds 4 times before starting the engine can usually clear the bubble. You could invest in a new fuel pressure regulator for about $60 since there is no way to test this item. Disconnect battery after replacement to reset the computer so it learns the new regulator.