I have just recently noticed at times when my truck is idlingmy RPMs will drop to about 500 and sometimes lower. If i give it a little bit of gas and let off it will do fine. it just started happening a few days ago. Today i replaced all of my vacuum lines because i had a few cracked ones, but it did it after that also. Does anyone have any ideas what could be happening?

 

no one here has any clue...

 

could be a number of things to be honest

TPS, AFM, IACV, fuel pressure regulator, and so on and so forth...

check your intake tube for cracks and leaks as well

 

tps....the the throttle position sensor...the easy way to do it if you have a problem with this is to disconnected and run the engine... if the engine still doing whatever is doing then the tps is good and it is something else......P.S. please let us know what you drive, year, model and engine.....I am assuming you are driving the truck you have in your avatar.

 

Like the others said, it could be a lot of things.

Year, model, engine, mileage, any mods that you've done, recent maintenance that's been done, etc...

Fink

 

sorry guys, its in my sig so i figured that was fine but its a 95 3.0 just did all the vac lines a couple days ago and i did the head gaskets a couple thousand miles ago. i have a K&N but that has been there for a good while before this started. And just today it would drop at start up to about 400 and surge between that and 500 and that happened about an hour or two after i drove about three miles. And when i drove it around the block a couple times it idled fine at about 750 or 800.

 

Pull the throttle body and give it a good cleaning, and then check and adjust the throttle body if needed.

 

alright il pull that off as soon as it cools down. the tps is right behind the the throttle body right? When i unplugged it it idled at 1100.

 

X2, 3, and 4.

So, you disconnected and the idle went up. Did it even out? Have you driven around, yet, to see how it's affecting things?

 

I agree with the TB cleaning suggestion - I would also hit your MAF with a little cleaner while you're in there.

Fink

 

what does maf stand for? can i use carb cleaner for it?

 

no i just let it idle. but it stayed there. and i can go drive it but i was clean the carb and stuff wile i got the nose of the truck pulled into my store room of a garage

 

Does anyone know what the little plate on the back of the throttle body is. its a bronze or brass color and has a tear drop shape on it. Well all of the screws holding it on were very loose and the thing could have fell completely off

 

Is it the actual valve itself?
Does it rotate on a pin in the center?

Fink

 

no its on the back of the throttle body. cant really explain how it looks. im trying to get the picture of it on the computer from my phone.

 

alright finally got this thing to cooperate. here is what im talking about. the rag is just because it was hot, and that is with the camera on the firewall facing the grill and the plate is on the back of the throttle body. the rag is on the surface where the throttle body connects to the plenum. http://s993.photobucket.com/albums/a...9.jpg&newest=1

 

here let me help you with that






looks like just an access point to something? did tightening it back up fix the problem?

I have no idea... not a 3.0l guy

 

didnt fix it but the motor doesnt do it as bad until it warms up a little bit. i have a small crack in my intake tube right at the throttle body but that has been there ever since i can remember and it has never had problem. could it be that my distributor needs to be advanced a little bit because if i recall the 3.0 is suppose to idle at 800 and now its at 700 or 750 could that cause a problem?

 

did you drove your truck with the tps disconnected?

 

i didn't drive it but it idles smooth and no surges or anything at 1100 maby i could just leave it disconnected or buy a new one and adjust the timing. im thinking that may be my problem or how do you adjust them