Should I replace IAC Valve? - JeepForum.com
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  • 2 Post By Delta0
  • 1 Post By carlsondrew3
  • 1 Post By Double E
  • 1 Post By Double E
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post #1 of 10 Old 08-03-2021, 01:00 AM Thread Starter
Ojivar
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Should I replace IAC Valve?

Recently cleaned my IAC Valve out as best I could and wondering if maybe it is beyond a simple clean and should be replaced?


It's looking a bit sad but then I've no idea what it should look like after being in use. Any thoughts? Is it something that needs regular replacement?

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post #2 of 10 Old 08-03-2021, 03:14 AM
Delta0
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How's your tick-over?
If your tick-over's good, leave well alone.

How's your finances?
If you've got money to burn, replace it.
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post #3 of 10 Old 08-03-2021, 09:53 AM
carlsondrew3
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If your idle is fine and youíre not having any stalling issues when stopped/parked than Iíd leave it alone as well.
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post #4 of 10 Old 08-03-2021, 03:23 PM
Double E
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It is not a frequent fail item but just needs a clean off occasionally. If you pull on the pintle out too far, it will seem to be broken but it does still work if you put it back in.
The TPS that rests alongside it is a more problematic item that needs to be replaced every few years.

When I clean mine, it's shiny so you might go after it once more.
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post #5 of 10 Old 08-04-2021, 12:09 AM Thread Starter
Ojivar
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Well the reason I cleaned it was because performance was dropping, whenever I get to 50mph the car revs up and down on it's own.



From the comments I'm guessing this is not an IAC issue as the car idles fine?
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post #6 of 10 Old 08-04-2021, 09:23 AM
blueseasons
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The IAC manages idle speed. If you have fluctuations, drops in the RPMs when idling , stoped in traffic etc. The sensor is suspect, and or the throttle body needs cleaning.You cant tell by looking at them if they work or not. I always hit that plunger tip with some "Super Fine" steel wool. It will shine right up. Check for some codes for the other issue.
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post #7 of 10 Old 08-04-2021, 09:53 AM
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The next item to look at if the TB is cleansed and the TPS is new is the Crankshaft Position Sensor. It's a little involved to get to but still DIY and not very expensive. It is at the Starter and measures the position of the crank shaft in relation to everything else that's rotating. It will require removal of the starter to access and can be tough to access even then ...but be patient and it will come out.

I believe those that have had difficulty with it coming out are in the winter salt-use areas. There are posts on remove/replace of it.

Here is my story on it: https://www.jeepforum.com/forum/f310...15min-3521098/
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post #8 of 10 Old 08-04-2021, 10:04 AM
HampshireWJ
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Revs rising and falling on their own at around 50 mph sounds like throttle position sensor (TPS) problem.
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post #9 of 10 Old 08-04-2021, 04:00 PM
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Quote:
Originally Posted by Double E View Post
The next item to look at if the TB is cleansed and the TPS is new is the Crankshaft Position Sensor. It's a little involved to get to but still DIY and not very expensive. It is at the Starter and measures the position of the crank shaft in relation to everything else that's rotating. It will require removal of the starter to access and can be tough to access even then ...but be patient and it will come out.

I believe those that have had difficulty with it coming out are in the winter salt-use areas. There are posts on remove/replace of it.

Here is my story on it: https://www.jeepforum.com/forum/f310...15min-3521098/
If you remove the plate that the shifter goes through the bolt to the ceank sensor is sitting right there looking at you.. Atleast on the left hand drive models

Sent from my LM-G710VM using Tapatalk
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post #10 of 10 Old 08-05-2021, 01:43 AM Thread Starter
Ojivar
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Quote:
Originally Posted by Double E View Post
The next item to look at if the TB is cleansed and the TPS is new is the Crankshaft Position Sensor. It's a little involved to get to but still DIY and not very expensive. It is at the Starter and measures the position of the crank shaft in relation to everything else that's rotating. It will require removal of the starter to access and can be tough to access even then ...but be patient and it will come out.

I believe those that have had difficulty with it coming out are in the winter salt-use areas. There are posts on remove/replace of it.

Here is my story on it: https://www.jeepforum.com/forum/f310...15min-3521098/
Quote:
Originally Posted by HampshireWJ View Post
Revs rising and falling on their own at around 50 mph sounds like throttle position sensor (TPS) problem.

I've replaced TPS about a year ago for a different issue, it is of course possible the new one is a dud. Luckily I still have the old one.


I have a new CPS but I can't even find the current one, let alone get to it.
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