# 2001 Honda CR-V acceleration issues

**URL:** <https://community.cartalk.com/t/2001-honda-cr-v-acceleration-issues/67635>\
**Category:** Maintenance/Repairs\
**Created:** [September 4, 2011, 2:13am UTC](https://community.cartalk.com/t/2001-honda-cr-v-acceleration-issues/67635 "2011-09-04T02:13:24Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![outbackbob](https://avatars.discourse-cdn.com/v4/letter/o/ecb155/32.png) [@outbackbob](https://community.cartalk.com/u/outbackbob)\
**Post date:** [September 4, 2011, 2:13am UTC](https://community.cartalk.com/t/2001-honda-cr-v-acceleration-issues/67635/1 "2011-09-04T02:13:24Z")

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Greetings fellow Simians of the Lube;

I recently replaced the 181K mile valve-burned engine in my 2001 Honda CR-V with a 40K mile engine from Japan. Since the swap idle is slightly erratic, acceleration from a stop is sluggish and check engine light indicates “P1508 error code” which is “Idle Air Control valve circuit failure.” Also have an issue with the A/C cycling on and off rapidly when idling that goes away as soon as the engine rpm is slightly increased. New OEM IAC valve is around $360 so I hesitate to replace it without informed opinions from the Car Talk oracle. All parts other than the engine itself are from my original engine in my CR-V. Any and all assistance is greatly appreciated.

Sincerely, outbackbob

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [September 4, 2011, 2:18am UTC](https://community.cartalk.com/t/2001-honda-cr-v-acceleration-issues/67635/2 "2011-09-04T02:18:24Z")

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The next time the idle acts erratic, take the handle of a screwdriver and rap on the IAC valve. If this causes the engine idle speed to change, then more than likely there’s a problem with the IAC valve. Have you checked the prices for an IAC valve from a local parts supplier?

Tester

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**Author:** ![outbackbob](https://avatars.discourse-cdn.com/v4/letter/o/ecb155/32.png) [@outbackbob](https://community.cartalk.com/u/outbackbob)\
**Post date:** [September 5, 2011, 6:25pm UTC](https://community.cartalk.com/t/2001-honda-cr-v-acceleration-issues/67635/3 "2011-09-05T18:25:09Z")

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Hey Tester;

Thanks very much for the feedback. Local dealership wants around $360 and local Napa dealer wants around $200. I think it may be a bit less from an online warehouse, but any suggestions you would like to put forth are, as always appreciated.

Thanks, outbackbob

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**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\
**Post date:** [September 5, 2011, 6:32pm UTC](https://community.cartalk.com/t/2001-honda-cr-v-acceleration-issues/67635/4 "2011-09-05T18:32:42Z")

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Its a circuit failure code which could indicate an IAC valve issue - or just a wiring problem. Having had an engine swap done it would be no surprise if a wire or connector was damaged / dirty, etc. Did you at least pull the IAC plug, clean & inspect and plug it all back up?