Idle issue
Idle issue
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Junior User
Joined: Feb 2003
Posts: 68
Likes: 0
Idle issue
The idle in my '95 Explorer has been acting up lately and I'm trying to figure out what's wrong. It lopes after being started on WARM engine. It will jump from 400 to 1500 rpm few times (stall sometimes) and then settles at normal idle speed. Same thing happens when driving at low speed, after letting go of gas, the RPM drops and bounces back up. I already checked IAC valve (seems fine), cleaned the throttle and I'm replacing the PCV valve. I'm really stumped.
Please HELP!
P.S. Does anyone know where exactly the PCV valve is on '95 4.0 engine? Haynes manual says it's close to brake cylinder, but I couldn't find it.
Please HELP!
P.S. Does anyone know where exactly the PCV valve is on '95 4.0 engine? Haynes manual says it's close to brake cylinder, but I couldn't find it.
Senior User
Joined: Jun 2000
Posts: 216
Likes: 0
From: CANADA
Idle issue
The PCV valve will be located on the left rocker cover near the firewall/brake booster.
Have you changed your filters? Maybe they are all plugged? Run the codes on then engine and see what you come up with.
Have you changed your filters? Maybe they are all plugged? Run the codes on then engine and see what you come up with.
Logistics Pro
Joined: Jan 2001
Posts: 4,123
Likes: 2
From: Fort Smith
Idle issue
Are you comfortable working with ohms and testing the Throttle Position Sensor? I am at work now, but can look up the ohms specs for it when I get home. You can test it and see if that could be the problem...
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Postmaster
Joined: Dec 2001
Posts: 3,742
Likes: 2
From: UT
Idle issue
I had a car that did the same thing. It would stumble at stop lights. Sometimes, when I started the engine and let it warm up, I could pinpoint when it went into closed loop, because the engine would start to lope. I would usually get a CEL (trouble code was an O2 sensor indicating rich). Tried replacing the O2 sensor, and that didn't fix it. Turned out that something had failed in the computer so it wasn't reading the O2 sensor correctly. In essence the computer thought that the engine was running rich when it wasn't. The computer then caused to engine to run too lean.
Does your CEL come on? Are you in a position to hook it up to a scanner and verify some of the sensor inputs?
Does your CEL come on? Are you in a position to hook it up to a scanner and verify some of the sensor inputs?
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New User
Joined: Jun 2002
Posts: 24
Likes: 0
Idle issue
Pull your idle air control unit and thoroughly clean it. You mentioned it looks clean - doesn't take much to gum it up and make it stick. Get some carb/choke cleaner, some small tools, and get after it. Also, disconnect the neg batt terminal for 10-15 mins, then reconnect; engine's computer will hunt for the correct "idle" conditions next time you start it up.
