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Old 02-23-2011, 08:31 PM
rlm1014 rlm1014 is offline
2004 Ford Ranger 3.0
 
Join Date: Feb 2011
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Default Engine seems to idle very high

I noticed while sitting the other day in my truck that it seems to idle high. Even when I let off the gas the truck goes nearly 10 mph all by itself. Anyone else experience this and if so should I or what could I do about it? Thanks.

NOTE: 2004 Ford Ranger Ext Cab 3.0 Automatic
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  #2  
Old 02-24-2011, 12:11 AM
blueranger1801 blueranger1801 is offline
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Default Re: Engine seems to idle very high

Quote:
Originally Posted by rlm1014 View Post
I noticed while sitting the other day in my truck that it seems to idle high. Even when I let off the gas the truck goes nearly 10 mph all by itself. Anyone else experience this and if so should I or what could I do about it? Thanks.

NOTE: 2004 Ford Ranger Ext Cab 3.0 Automatic
Alright this should not be hard to fix at all as i had the same problem.

First what i want you to look for is any vaccume leaks under the hood. Look very carefully at all the lines. Follow them make sure they are all tight and non are cracked or anything.

The most notorious one to crack is the PVC valve hose. This was the culprit in my truck and i replaced it with one that i designed my self and it cured the high idle and now my truck runs like new.

If all your hoses are OK or you found one that is broken and fixed it but still experiencing a high idle then your next thing to look at is your idle control valve.

Go ahead and give the i.c.v a good cleaning with electrical contact cleaner. If that dont work you can just go and get a new one and install it. ( I also suggest if you got that spray to go ahead and clean the mass air flow sensor as well this is very beneficial as it will calibrate the air/fuel ratio in your engine alot better once cleaned well.)

Check your spark plugs as well see what condition they are in. It may be time to get new ones.

After doing any of this you should go ahead and reset the computer. This is once again really beneficial as it guarantees that your engine computer completely re-calibrates everything after making these changes.

Basically what i have stated above is the basic things that one would do when confronted with a problem such as high idle. These are the most common culprits to the problem and easy to fix. It all falls back to some t.l.c

One more thing i will suggest to you as i do suggest to every one is to sea foam your engine. Just go to any store that sells it and pour it right into the brake booster vaccume like. This really helps your engine breath alot better and work more efficiently and you could see some gain in power that your engine lost over the course of its life due to carbon build up and gunk and all that nasty crap.If you dont know anything about this just ask me and i will explain it all to you. and one last thing about sea-foaming. I recommend doing this before changing your spark plugs.

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BTW where in Florida are you? Im beginning to think im the only one in Miami lol.
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Old 02-24-2011, 04:17 PM
rlm1014 rlm1014 is offline
2004 Ford Ranger 3.0
 
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Posts: 19
Default Re: Engine seems to idle very high

Wow that is some great information, thanks. Any way I could get links to some walkthroughs or guides? I am very handy and feel I can do most if not all the work on this truck, which is what I have done with all of my other vehicles, however I would just need a good step-by-step if available. For now I'll look over on the how-to section. Thanks again.
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Old 02-24-2011, 07:00 PM
blueranger1801 blueranger1801 is offline
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Default Re: Engine seems to idle very high

Well just tell me what you want a how to for and i will look for it if you dont find it.

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I can tell you right now. If you wanna look for vaccume leaks. One thing you can do is get a can of Brake Fluid Cleaner. The spray ones not the ones where you just pour it. And go into your engine bay with your engine running. Spray the brake cleaner around vaccume hoses and areas were they connect and stuff. And listen to your engine. If while spraying a particular area your idle suddenly changes like surges or what ever then that means your vaccume leak is around that spot. You can keep spraying around that spot to isolate the leak until you finally find it. This is the easiest way to find a leak. But you need to make sure you spray in all possible areas that have anything related to vaccume.

Remember. I am not saying that this is your problem. Im just saying that its one thing you need to check.
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Old 02-24-2011, 07:03 PM
terryduanemiller terryduanemiller is offline
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Default Re: Engine seems to idle very high

bad EGR will cause surging
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Old 02-28-2011, 07:44 PM
rlm1014 rlm1014 is offline
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Default Re: Engine seems to idle very high

UPDATE:

I cleaned the MAF sensor and the IAC this evening. After they were reinstalled I noticed a slightly lower idle and less shuttering. I ran the rpms up a little and they settled around 800-900. I have not had a chance to drive it but I think it helped.

Also, sorry I'm not ignoring you but I didn't see when you asked what part of FL I am from. I was born in Brandon but have lived in Bushnell ever since.
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