Originally Posted by rlm1014
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.
BTW where in Florida are you? Im beginning to think im the only one in Miami lol.