# 2001 Oldsmobile Alero cylinder 1 misfire

**URL:** <https://community.cartalk.com/t/2001-oldsmobile-alero-cylinder-1-misfire/105095>\
**Category:** Maintenance/Repairs\
**Tags:** alero, oldsmobile\
**Created:** [June 19, 2017, 4:40pm UTC](https://community.cartalk.com/t/2001-oldsmobile-alero-cylinder-1-misfire/105095 "2017-06-19T16:40:54Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jonathan\_mangol](https://avatars.discourse-cdn.com/v4/letter/j/439d5e/32.png) [@jonathan\_mangol](https://community.cartalk.com/u/jonathan_mangol)\
**Post date:** [June 19, 2017, 4:40pm UTC](https://community.cartalk.com/t/2001-oldsmobile-alero-cylinder-1-misfire/105095/1 "2017-06-19T16:40:54Z")

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I have a 2001 Oldsmobile Alero. It started idling and driving rough yesterday. It has trouble with the rpm and acceleration when driving so I ran a scan and it came up as a cylinder 1 misfire. I changed all the plugs, wires and ignition coils but it is still running rough and coming up as a cylinder 1 misfire. I am at a loss as to what could cause this issue. Any help would be appreciated.

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**Author:** ![kurtwm1](https://avatars.discourse-cdn.com/v4/letter/k/13edae/32.png) [@kurtwm1](https://community.cartalk.com/u/kurtwm1)\
**Post date:** [June 19, 2017, 5:03pm UTC](https://community.cartalk.com/t/2001-oldsmobile-alero-cylinder-1-misfire/105095/2 "2017-06-19T17:03:25Z")

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Could be fuel injectors. Switching #1 with another one and see if the problem moves to the switched cylinder.

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [June 19, 2017, 5:31pm UTC](https://community.cartalk.com/t/2001-oldsmobile-alero-cylinder-1-misfire/105095/3 "2017-06-19T17:31:08Z")

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Was the plug from #1 clean and light tan in color? Or black and sooty? Or black and oily?

@kurtwm2010 s suggestion is a good one if the #1 plug looked light tan. If its oily, you may have a valve seal or rings going bad in that cylinder. Do a dry and wet compression check to determine which.

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**Author:** ![TwinTurbo](https://avatars.discourse-cdn.com/v4/letter/t/8baadc/32.png) [@TwinTurbo](https://community.cartalk.com/u/TwinTurbo)\
**Post date:** [June 19, 2017, 5:49pm UTC](https://community.cartalk.com/t/2001-oldsmobile-alero-cylinder-1-misfire/105095/4 "2017-06-19T17:49:07Z")

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The condition of the removed plug may have interesting clues as Mustangman suggested. I would probably do a compression test first, followed by the injector swap if compression results looked OK.