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Post by lxexpress on Oct 12, 2005 23:44:32 GMT -5
i got an 88 mustang 5.0 ,lotsa mods no power adders,my idle will randomly decide to run at 1200 rpms sometimes,sometimes it runs right at 750 rpm,pull up to a light push the clutch in,boom 1200 rpm ,shut the car off,turn it on,750 rpm,  ? idle air motor,mass air meter all the normal stuff has been checked...any ideas???could do it 6 times a day,maybe not for 2 days,hot cool weather doesnt matter |
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foursix
1st Gear
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Posts: 32
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Post by foursix on Oct 13, 2005 6:46:40 GMT -5
I've got a 96 Ranger with the 2.3 4banger doing the exact same thing. Exept mine if I'm stoped and its idleing high I hand hold the brake and load the engine by slowly letting out on the clutch until the truck almost dies then push it back in the idle will stay down. I've been chasing this problem for a year now.
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Post by Luis on Oct 16, 2005 21:47:14 GMT -5
Hello Bro hear is something that may help how to adjust the TPS sensor and even how to check it you may have one that is bad or needs adjustment.
How To Adjust TPS
The throttle position sensor is one of those things that falls into the category of "computer stuff" that makes a big difference and is easy to deal with, but average people like us would never know about. Without the proper adjustment, the throttle position sensor (TPS) will give the computer a false reading as to the exact throttle opening. A false reading will limit wide open throttle performance (something we definitely don't want). A voltage reading must be taken using a digital volt/ohmmeter (DVOM) with the Key On/Engine Off and with the Key On/Engine Running. A Radio Shack DVOM, part No. 22-185A, works well for this job.
The TPS is located directly on top of the throttle body and is adjusted by loosening the two phillips mounting screws and swiveling the sensor until the highest reading is found. It may be necessary to elongate the holes with a small file to achieve the desired reading.
The spec range for Key On is from .88 to 1.0 volt; shoot for the .97 to .99 volt. With the engine running, the voltage should be no higher than 1.05 volts.
Incorrect Throttle Position Sensor (TPS) voltage will result in reduced performance. The best way to take a TPS voltage reading is by using two safety pins through the wires coming from the sensor. The positive lead is attached to the green wire, while the negative goes to the black wire. Always ground the meter through the sensor's black wire. This gives a direct, and more accurate ground into the computer.
the other things to look for is any vacuum hose that may be leaking like a pin hole, spray con tack cleaner and see if your idea changes, also cleaning the air intake, throttle body and plenum wont hurt it also. Will I hope this can help you if not let me no i Will ask some 5.0 guys i no for advise.
Goodluck
Luis
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