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Rough idle it fluctuates between 800 and 600 RPMs

Tiny
INTEGRA831
  • MEMBER
  • 2000 ACURA INTEGRA
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 98,000 MILES
I've been having an idle issue with my car where it fluctuates between 800 and 600 RPMs when at a stop sign or when I'm reversing etc. It has been doing this for a while and I have changed the PCV and ICV and nothing really has changed. There aren't any codes being thrown either so I'm kind of stumped. Any ideas you might have as to what's causing this?
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Sunday, July 10th, 2022 AT 8:50 PM

14 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,904 POSTS
I have seen the linear control solenoid cause this issue, is this the one you changed out? Check the diagrams below. Check out the diagrams (below). Please report back.
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Monday, July 11th, 2022 AT 3:06 PM
Tiny
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No, I haven't changed that out, would it cause idle to just jump up and down from 900ish RPMs down to like 600? Sometimes when I stop at a red light it feels like it's shutting off and sometimes it's stable.
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Monday, July 11th, 2022 AT 3:51 PM
Tiny
KEN L
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Yes, that is what this part controls, let us know what happens.
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Tuesday, July 12th, 2022 AT 10:52 AM
Tiny
INTEGRA831
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I recently just changed the solenoid and it's still causing it to not shift down at high speeds and at one point it when into “limp” mode where even in drive it felt like I was not in neutral. Any ideas what else it could be? Maybe the other solenoid possibly?
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Tuesday, July 19th, 2022 AT 9:44 AM
Tiny
KEN L
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Did that fix the idle fluctuation?
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Wednesday, July 20th, 2022 AT 12:06 PM
Tiny
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No it did not, could it be the shifting solenoid? Or could it be that my transmission is going out?
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Wednesday, July 20th, 2022 AT 7:35 PM
Tiny
KEN L
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I could be the transmission itself engaging and disengaging, have you checked the transmission fluid level or condition? If not, it could need a transmission service. here is a generic guide to help with specific instructions for your car in the diagrams below:

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

A/T Fluid

Type .................... Honda Premium Formula ATF
Capacities

A/T Fluid

Change .................... 2.7L (2.9 Qt)

Total .................... 5.9L (6.2 Qt)

Check out the diagrams (below). Please let us know what happens.
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Thursday, July 21st, 2022 AT 10:38 AM
Tiny
INTEGRA831
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I recently got a check engine light with the code P0740.
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Sunday, July 24th, 2022 AT 7:37 PM
Tiny
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Could it be the shift control solenoid on the transmission?
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Sunday, July 24th, 2022 AT 7:38 PM
Tiny
KEN L
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Yep that can do it, or you have a bad torque converter. Can you try the engine idle problem in neutral and see if anything changes? Here is the converter clutch solenoid location in the diagrams below.
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Monday, July 25th, 2022 AT 12:45 PM
Tiny
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I know for certain its not the torque converter going bad since I recently changed it about a month ago, I just bought the clutch solenoid and will change it when possible.
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Monday, July 25th, 2022 AT 12:47 PM
Tiny
KEN L
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Sounds good, let me know. Like I say if you try the car in neutral or park it will let you know for sure, I have seen rebuilt parts go bad.
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Tuesday, July 26th, 2022 AT 11:47 AM
Tiny
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So, I have changed the TCC solenoid and it seems like the idle is holding steady when I come to a stop but when in neutral it does shake a bit. Do you think the trans just going bad?
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Thursday, July 28th, 2022 AT 9:37 AM
Tiny
KEN L
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I don't think so, the engine has a rough idle now. This sounds like a new problem. Please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Cheers, Ken
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Thursday, July 28th, 2022 AT 10:31 AM

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