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formulaben

DIY - Replacing Idle Air Control valve (IAC) or Throttle Position Sensor (TPS)

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justgary

Next time I'm out with my friend in his '03, I'll pay more attention.

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Levi900RR

Just to cloes the loop on this... I put a set of spark plugs in my boat today and it is a totally different animal. It was way past due. It had started skipping pretty badly. After I installed the new plugs the surging at idle condition has gone away. Wish I had done that two years ago!

:Doh:

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MadMan

Just to cloes the loop on this... I put a set of spark plugs in my boat today and it is a totally different animal. It was way past due. It had started skipping pretty badly. After I installed the new plugs the surging at idle condition has gone away. Wish I had done that two years ago!

:Doh:

How bad did the plugs look? Any pictures?

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Levi900RR

I have them... I'll try to find time to take pics today. Some looked ok some looked bad

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Woodshed

Mine was 37$ at O'Reilly of a Ford Focus. Odd that it's a Chevy engine....

I just removed and replaced everything works great.

Woodshed

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Levi900RR

How bad did the plugs look? Any pictures?

Here you go...

24BEED99-6300-4B03-A0E4-7CA15B9FE550.jpg

81E79553-5EC0-4CFA-B41E-826DBA01B61E.jpg

9EBD23DA-394A-4151-9E2A-0AE5545D6784.jpg

33900E18-C658-485A-A3E5-71A49394BB8A.jpg

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Levi900RR

I got my IAC for $37 and the TPS for $41 at the local O'Reilley's...

Do you have any part numbers? Or did you just remove them and match them up in the store?

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formulaben

I used a 1999 Chevy Suburban 350 as the part reference, as per someone else here. Looked to be a perfect match of the old one.

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Levi900RR

I used a 1999 Chevy Suburban 350 as the part reference, as per someone else here. Looked to be a perfect match of the old one.

Great, thank you!

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King115

Curious to know where are the pins located? 

We have a mastercraft x7 2005.

I am currently helping my husband with his boat we bought roughly 6 months ago. 

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95echelon
On 9/29/2014 at 7:46 PM, formulaben said:

I got my IAC for $37 and the TPS for $41 at the local O'Reilley's...

Do you happen to have the part number or what I should search for? Do they have a marine parts finder?

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formulaben

I just followed someone else's advice here and told them it's off a 1999 Chevy Suburban 350 and it matched perfectly.  Not sure about newer engines though...

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95echelon
lorien

Can any of you savvy veterans tell me if a 2007 LXI SE with a 383 Hammerhead will have an IAC (and if so, where it's located)?  I cannot find it on my engine, though I didn't remove the plenum yet.  Boat is fuel injected and drive by wire so I'm not certain it has one, but is experiencing stumbling acceleration, surging at speed, smells rich, and long cranking starts.  I had one backfire a near full throttle when I was testing things.

 

 

 

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justgary
32 minutes ago, lorien said:

Can any of you savvy veterans tell me if a 2007 LXI SE with a 383 Hammerhead will have an IAC (and if so, where it's located)?  I cannot find it on my engine, though I didn't remove the plenum yet.  Boat is fuel injected and drive by wire so I'm not certain it has one, but is experiencing stumbling acceleration, surging at speed, smells rich, and long cranking starts.  I had one backfire a near full throttle when I was testing things.

Change the cap, rotor, plugs, and wires.  If it isn't fixed check the fuel pressure.  If it isn't fixed, clean the throttle body.  If it isn't fixed, come back and report here.

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lorien
On 5/23/2020 at 6:49 AM, justgary said:

Change the cap, rotor, plugs, and wires.  If it isn't fixed check the fuel pressure.  If it isn't fixed, clean the throttle body.  If it isn't fixed, come back and report here.

Thanks for this Gary!  Problem was solved when the plugs were changed.  I had already cleaned the throttle body and air filter, but the plugs made everything go back to normal.  I will swap out the cap/rotor/wires as soon as they arrive.  Couldn't get that locally for my setup.  

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