ok ive had this weird RPM issue going on for a while, it will jump between 500 and 1000 rpm during idle times, i took the IAC valve off and cleaned it with throttle body cleaner, scrubbed it, rinsed it and put it back on and now it made the rpms act worse than before, going slightly below 500 feels like the cars going to turn off, just got new vaccum lines so thats not it, ive heard disconnect the battery for 15 min to reset the comp, about to go do that just though id post and see if you guys have any ideas what it could be, thanks
Cleaning Idle Air Control Valve MADE IT WORSE!!
_MustangMan_
21 - 40 of 55 Posts
Joined
·
399 Posts
Now that its getting colder its really struggling to not stall out when its on , I couldnt even back out of my spot without my car stalling, imma take it to the shop tommorrow or Tuesday if it will make it there
Sent from my HTC One V using AutoGuide.Com Free App
Sent from my HTC One V using AutoGuide.Com Free App
Joined
·
348 Posts
If cleaning it didn't work than you need a new IAC valve. Went through this with my Explorer. That's my guess at least.
You can get OEM replacments for under $100.
RockAuto Parts Catalog
You can get OEM replacments for under $100.
RockAuto Parts Catalog
Joined
·
399 Posts
Yeah the shop just called me said it was the IAC valve, they also checked a sensor and said it needed to be replaced too
Sent from my HTC One V using AutoGuide.Com Free App
Joined
·
399 Posts
I get my car back today they said they had fixed it, they put a new IAC valve in and drove it said it was good to go. Well 10 min after driving away I park somewhere, when i shift into reverse the car almost stalls out, and as i sit there the rpms start bouncing around again! So i had to take it back, they said It might be a computer issue. This is so ANNOYING!!
Joined
·
2,938 Posts
Has anyone checked the throttle stop screw preset yet? Do not depend on the dealer mechanics to do this, most don't even know it's something that needs to be done.
Another possible trouble point is the PCV valve, if clogged that will also reduce the fixed bypass air entering the plenum...
Another possible trouble point is the PCV valve, if clogged that will also reduce the fixed bypass air entering the plenum...
Joined
·
399 Posts
no i dont think thats been checked yet, where is that located?
Joined
·
2,938 Posts
Ummm, you could try clicking on the link I provided--twice...
Joined
·
399 Posts
Oh my bad didn't see that before lol
Sent from my HTC One V using AutoGuide.Com Free App
Joined
·
399 Posts
ok so an update on the problem pretty much the shop doesn't know what is wrong with it, because it will run like a charm and then all the sudden start fluctuating rpms again out of no where. The said it wasn't clogged cats, or MAF, new IAC not the prob, brand new vacuum lines not the prob. Its not pulling any codes at all. They think might me a intake leak or something computer wise thats causing it. What do you guys think?
Joined
·
2,938 Posts
Has anyone checked the throttle stop screw preset yet?
Joined
·
399 Posts
im going to call the shop and have them check it, also I recently read someone replaced their aftermarket cold air intake with OEM park and it fixed the problem, i wil prob try that if it isnt resolved
Joined
·
399 Posts
Ok so an update on my problem the mechanic has tested my car with every test he has and shows nothing . I told him about the throttle screw and he said he will check it out but the computer should reset itself to match the position if the screw was moved , he ran a fuel pressure which it passed , he ran an intake test it passed , he ran a data point test and all the sensors passed , he thinks it could be the aftermarket bbk cold air intake so he's gonna take it off and run it regular and see if that fixes it
Sent from my HTC One V using AutoGuide.Com Free App
Sent from my HTC One V using AutoGuide.Com Free App
Joined
·
2,938 Posts
He is wrong, so it is good that he his going the check the setting--make sure he does. What he is referring to is the ratch voltage which is the lowest throttle position sensor voltage observed by the PCM, and is considered to represent "closed throttle" by the PCM. It is constantly updated, though the longer the engine runs the longer it takes to learn new values. The ratch voltage is unrelated to the throttle stop screw preset adjustment.
There is a scalar value in the tune named Airflow through throttle body (see below) that tells the PCM how much air is "flowing through the throttle body" (duh?) with the throttle "closed". Setting the stop screw as described will make the actual air flow as close to that value as is practical...
Joined
·
399 Posts
Ok thanks so much this helps a lotHe is wrong, so it is good that he his going the check the setting--make sure he does. What he is referring to is the ratch voltage which is the lowest throttle position sensor voltage observed by the PCM, and is considered to represent "closed throttle" by the PCM. It is constantly updated, though the longer the engine runs the longer it takes to learn new values. The ratch voltage is unrelated to the throttle stop screw preset adjustment.
There is a scalar value in the tune named Airflow through throttle body (see below) that tells the PCM how much air is "flowing through the throttle body" (duh?) with the throttle "closed". Setting the stop screw as described will make the actual air flow as close to that value as is practical...
![Image]()
Sent from my HTC One V using AutoGuide.Com Free App
Joined
·
399 Posts
Ok they think they figured out what the problem was. It was the fuel pressure, They said it had where 30lbs was the max so when the car started up it was fine but then it slowly leaks pressure as it goes on, said there was a wire that was shorting it out somewhere or something, not a cheap fix
Joined
·
399 Posts
Omg I'm so freakin pissed, more problems!! This morning when I drove her she was struggling to go in first like it was trying to stall, I had to put the clutch in and rev the rpms up then engage wtf could this be. So many freakin problems , this will be my third trip to the shop with pretty much the same problem
Sent from my HTC One V using AutoGuide.Com Free App
Sent from my HTC One V using AutoGuide.Com Free App
Joined
·
3,015 Posts
shops are useless :bash:
Joined
·
399 Posts
lol tell me bout it :facepalm:
Joined
·
399 Posts
21 - 40 of 55 Posts
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
