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  #1  
Old 04-18-2011, 02:42 PM
ddunfee ddunfee is offline
Ford Motor Co
 
Join Date: Jan 2011
Posts: 169
Default Fast idle

My '95 ranger w/2.3 auto just started idling fast about 3000 rpm.
It seems to be after it warms up. I changed the TPS and cleaned the Idle control valve, which didn't seem very dirty. I can't detect any vacuum leak and doubt that it is that because given enough time at an idle the engine will return to ~900 rpm but soon as you bring it off an idle or put it in gear it jumps back up to 3000 rpm. Going down the road there is enough power to keep the speed to ~45 mph. Help! I have ran out of ideas.
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  #2  
Old 04-20-2011, 04:27 PM
ddunfee ddunfee is offline
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Default Re: Fast idle

After replacing the tps and iac I pulled the connector off of the ecm coolant temp sensor and the idle went down, will replace tommorow
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  #3  
Old 04-20-2011, 04:48 PM
terryduanemiller terryduanemiller is offline
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Default Re: Fast idle

4 bangers have common idle surge, its the EGR, you can block the vacuum line at the EGR with a BB, yes like a bb gun..
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  #4  
Old 04-21-2011, 02:20 PM
ddunfee ddunfee is offline
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Default Re: Fast idle

Replacing the coolant sensor made the truck idle just perfect whether warm or cold. Yeah!!!!
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  #5  
Old 06-01-2011, 07:41 PM
DABS37398 DABS37398 is offline
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Default Re: Fast idle

Dave,
My truck was doing the exact same thing. I too have replaced everything. I tried disconnecting the coolant sensor but that didn't make a difference either...stumped
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  #6  
Old 06-02-2011, 02:40 AM
ddunfee ddunfee is offline
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Default Re: Fast idle

Quote:
Originally Posted by DABS37398 View Post
Dave,
My truck was doing the exact same thing. I too have replaced everything. I tried disconnecting the coolant sensor but that didn't make a difference either...stumped
Define everything
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  #7  
Old 06-02-2011, 09:30 AM
Gumcrew2 Gumcrew2 is offline
Ford Tough
 
Join Date: Feb 2011
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Default Re: Fast idle

Quote:
Originally Posted by ddunfee View Post
Define everything
That could be a signature
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  #8  
Old 06-03-2011, 05:49 PM
DABS37398 DABS37398 is offline
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Default Re: Fast idle

IAC new, TPS new, throttle body cleaned like new, all vacuum lines tested, disconnected the cruise control linkage, lubed the accelerator linkage, new plugs, wires, fuel filter, air filter, MAF cleaned, sea foamed through intake and fuel tank. All parts of intake disassembled, cleaned, new gaskets etc. OBD II - ABS scans show everything normal. I'm stumped.
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  #9  
Old 06-04-2011, 04:29 AM
ddunfee ddunfee is offline
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Default Re: Fast idle

The coolant sensor you disconnected. Did it have two wires to it?
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  #10  
Old 06-04-2011, 08:05 AM
Williamski Williamski is offline
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Default Re: Fast idle

Having same problem with my 97 truck. it idles up and down, uo and down, up and down. When it idels down it trys to die. The after 5 to 10 mins sitting it will level off to around 9 to 11 rpm's. But if you touch the gas it all start's over again. I have spent close to 500.00 on chnaging everything that I could under the hood.. I Can't seem to find out what is wrong with it???????????????????????????????????????????????? ????
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  #11  
Old 06-05-2011, 06:20 AM
ddunfee ddunfee is offline
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Default Re: Fast idle

Sometimes it is cheaper to pay a mechanic to put his fancy code reader on to see what is happening
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  #12  
Old 06-05-2011, 09:31 AM
DABS37398 DABS37398 is offline
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Default Re: Fast idle

We have a fancy code reader that maps all systems etc. Both harnesses were unplugged on the water system. Dash guage went dead but no difference in performance.
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  #13  
Old 06-05-2011, 12:50 PM
Williamski Williamski is offline
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Default Re: Fast idle

I had it put on a big computer. He said something about the #2 cylinder. I canged all wires sparks plug, EGR Mass aif flow sensor. FPS. TCS.And a few other things I don't know the name's to.. Have not gotten to the O2's yet. Don't think it's that. Coil packs are firing. Just checked them.. I have to get cleaned up. Have a VBS meeting in about 45 min's.
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