Pinging and high idle...
Thread Starter
|
New User
Joined: Aug 2004
Posts: 13
Likes: 0
Pinging and high idle...
I have a 2004 Ranger 4x4, 4.0 , 5spd, 50,000 miles. My truck has been pinging since I first got it at 30,000 miles. I've cleaned the MAF sensor and looked for vacuum leaks. No luck. Another problem I've been having is when driving through town, every time I put the clutch in the engine revs up to about 2000 rpms or so, and doesn't drop back down until I come to a stop. The main reason I'm posting this is because I feel like these two things could be related, but since I don't know everything there is to know about me engine I'm not making the connection, and I'm hoping that some one out there can. Any ideas? Thanks!!!
Elder User
Joined: Feb 2007
Posts: 771
Likes: 0
From: Aurora
Not sure about the rev situation, but the pinging might be due to carbon build up in the combustion chamber. I've read here time and time again that Seafoam is a good additive to take out the carbon. Try a higher octane gas to see if it helps. She's about due for some other maintenance checks. Ask your dealer for a list or check your owners manual.
hope it helps
Fred
hope it helps
Fred
Senior User
Joined: Aug 2001
Posts: 357
Likes: 0
I have a '93 with the 4.0 and it has had the same symptoms. I've asked a lot of these same questions. First of all, the pinging will go away at running temps if it's carbon build-up. Second Is it pinging, or more ticking. Mine ticks constantly and I am now quite sure there is something wrong with a lifter. I've accepted the fact that I am going to have to go ing there and take a look at the lifters on the driver side.
Idleing high? Very frustrating isn't it? Facing the engine on the drivers side, and near the intake of the throttle body, there is a shiny tube looking thing with a small wiring harness attached to it. This is the IAC. (Idle air control. It is a solenoid) It controls your idle (somehow). It may be bad. After engine is up to temps, unplug the IAC and if the idle does not change, replace it. If the idle drops to almost dying, then the IAC is good.
Other than that, I just live with it.
And . . . Oh yeah . . . there's good reading in the first forum that says "Read First".
Idleing high? Very frustrating isn't it? Facing the engine on the drivers side, and near the intake of the throttle body, there is a shiny tube looking thing with a small wiring harness attached to it. This is the IAC. (Idle air control. It is a solenoid) It controls your idle (somehow). It may be bad. After engine is up to temps, unplug the IAC and if the idle does not change, replace it. If the idle drops to almost dying, then the IAC is good.
Other than that, I just live with it.
And . . . Oh yeah . . . there's good reading in the first forum that says "Read First".
Last edited by live2hunt; Apr 2, 2007 at 09:16 AM.
Elder User
Joined: Jul 2006
Posts: 601
Likes: 0
From: Denver
I also suspect the iac is causing high idle, but the above description of checking it may not work, in my experience.
The most common problem with the iac is that they stick open, so the engine won't idle down when approaching a light, etc. I would get the engine to operating temperature, then shut it off for a couple of minutes. Unplug the iac and restart - idle should be quite low - under 700 rpm. plug it in and idle should be at normal speed. You can also clean the iac (but it won't last long after that, in my experience) to confirm that its sticking.
The fuel injectors can make a lot of noise on these engines, so before you get too crazy changing things, make sure its not the injectors you are hearing.
The most common problem with the iac is that they stick open, so the engine won't idle down when approaching a light, etc. I would get the engine to operating temperature, then shut it off for a couple of minutes. Unplug the iac and restart - idle should be quite low - under 700 rpm. plug it in and idle should be at normal speed. You can also clean the iac (but it won't last long after that, in my experience) to confirm that its sticking.
The fuel injectors can make a lot of noise on these engines, so before you get too crazy changing things, make sure its not the injectors you are hearing.
Thread Starter
|
New User
Joined: Aug 2004
Posts: 13
Likes: 0
So the iac is basically a controlled vacuum leak right? So if mine is getting stuck open would it make sense that this is also causing it to ping? Also something I noticed is that it never pings unless it is above 50 degrees outside. Doesn't my engine adjust to the outside temperature in some way?
More Turbo
Joined: Dec 2006
Posts: 624
Likes: 2
From: FL
Originally Posted by nybeat84
So the iac is basically a controlled vacuum leak right? So if mine is getting stuck open would it make sense that this is also causing it to ping? Also something I noticed is that it never pings unless it is above 50 degrees outside. Doesn't my engine adjust to the outside temperature in some way?
