ill be at idle in neutral at a stop and my ef9 will be idling ok then randomly itll drop down rpm like it wants to die but it stays alive its weird any help...?

 

Is it like droping from 1k rpm to like 100 and bouncing up and down like that?

 

kind but its not constant it does it then goes back to normal for a min then again and again etc

 

have u tried cleaning iacv?

 

also is the battery old? and hows ur altenator? are they good? could be electrical, like incorrect amount of voltage, and like stated the IAVC, its located on the intake manifold

 

yeah i have cleaned the eacv its different but does the same thing anyways yeah its been cleaned but whats the best way to clean it with and also i do need to get a new battery i dont think the alternator is bad but i am gonna rebuild it later on some also told me could be the timing belt on too tight

 

i use brake cleaner... i might be having the same issue as you. i check my timing and it was dead on, cleaned iacv, checked for leaks and still have a roaming idle. tomorrow i will try another iacv. i'll let u know the result.

 

ya also check ur batterys n see what that does for u.

 

It happened to me also, the shop could not figure it out and I was not throwing any codes,it turnd out to be exhaust.bad cat convert it rotted inside and clogged.

 

mine is doing the same thing after i swapped out my throttle body and tps...might be because i didn't calibrate the tps and properly adjust the throttle cable and idle screw after installation...FML

 

Don't listen to this person.

 

Sounds to me like a voltage issue. you could also check the fast idle valve.

 

pay 3 bucks at autozone and buy a new pcv valve. helps idles alot because the pcv valves are usually the stock ones 20 years old lol.

 

didn't get to try another iacv, but i cleaned and tightened the fitv and i still have the same problem...

however, when i move the wiring harness near the distributor my idle goes up. it's kind of weird. not sure if it has anything to with it.

 

well wut this guy said seems to b the problem. cause i had this with my lsv-t set up, i thought it wus a bunch of vac lines nd **** but it was the battery bein crapped out

 

yeah im a get a new battery i ran a voltage test on it and its not charging all the way but also gonna swap out all my belt just in case some are a little loose

 

just found out it does it when the fan goes on what could it be

 

Does it also do it if you turn your lights on? Or other electrical devices? It could be a bad ground perhaps?

 

yeah it does but not as bad as when the fan goes on

 

Then i'd be checking all of your ground wires and making sure they're attached correctly.