Question about 1998 Ford Escort

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98 escort high idle

When i start my 98 escort it runs at about 3000 rpms constantly. cleaned mass air flow sensor still high idle. if i unplug the maf it idles very low and almost dies

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Check for vaccuum leaks.. try spraying brake cleaner around the lines and see if it changes anything with the idle spped.. if it sucks in some it will chug while you spray it.. That helps locate a leak..

Posted on Apr 22, 2013


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Posted on Jan 02, 2017

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SOURCE: 91 Taurus idles @ 2000 to 2300 RPM's Have checked

try cleaning the air bypass solenoid at the throttle body,holds on with 2 bolts and is long and round with a wire plugged in at the end.its probably carboned up and sticking open

Posted on Sep 07, 2009

Testimonial: "Thank you for your responce. The problem was the Idle Air control valve. The diaphragm was torn. "

michigan man
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SOURCE: At startup my 94' F150 will oscillate from high to low idle

I had this problem once on an econoline van and it was the plantum gasket but before you change this check all the vacuum lines and get a digital volt meter and test the voltages on the mass air flow sensor and if you have to change the plantum gasket auto zone can print you out a diagram stating all you have to remove to replace it

Posted on Jan 09, 2009

  • 21 Answers


on the sohc engine there is a rubber elbow on back of the valve cover going over to a line at the fuel injection that cracks at about 100K miles and lets the engine **** air and it will idle horrible til you fix it. Check this and see if it's not your problem...I've had it happen to 3 sohc engines and the dealer wanted $400 to fix the first one for my friend...Took about 30 seconds to pop the hood and pull it off, 3 minutes to glue it back together, an hour to dry, and 30 seconds to reinstall it...

Posted on Feb 03, 2010

  • 186 Answers

SOURCE: 2000 expedition- mass air flow sensor and computer

Sound like you have a big vacuum leak. Check the hoses that attch the PCV valve on the valve cover on the passenger side. Also reach way back on top of the engine there's another hose there that is known for going bad. The dealer has those hoses and they call it the Heated PCV valve hose assembly. Very common problem.

Posted on Mar 02, 2010

  • 2309 Answers

SOURCE: I got error code for bad o2 sensor. and MAF sensor

you're looking at this the wrong way, i suspect you have an engine problem, do a compression and leak down test, also look for a vacuum leak after the maf sensor

Posted on May 28, 2010

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2 Answers

2003 ford explorer idle surged on me driving. Stopped and put in neutral went up to 3000 rpms. Fast idle now

Given all the electronic sensors that could cause this problem , your best bet is to take it to a qualified repair shop where they have advanced testing equipment . Just so you do spend all your money replacing parts ,,here is just a couple that can cause this problem ! Idle air control valve , throttle position sensor , vacuum leaks , map sensor . dirty throttle plate . mass air flow sensor . A qualified repair shop has a scan tool that can check data for all these sensors .

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The mass air flow sensor, the throttle body and the idle air control motor need a good cleaning. Use a brush and brake clean everything except the Mass air flow sensor, just spray it down, both sides. After you clean it, it will take a few second to restart.

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2003 Grand Am Has P0102

It is not an ECM/PCM problem.
P0102 - Mass or Volume Air Flow Circuit Low Input
Possible causes- Faulty mass air flow sensor
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Why does my 1995 240sx bog and sputter

bad maf? happens once in a while especially with this 15 year old car. buy some maf cleaner for ^ bucks and spray the maf off the car. dont use anything to dry it just the spray. do what the previous poster suggested and id change the o@ sensor since its obviously a bad fuel to air ratio.

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Something is disconnected.Is the MAF (mass air flow tube on ) is the MAF electrical part connected in its socket,Vacuum hose to the intake manifold. (Will have a way high idle and you would hear it) Idle air control hook up? Can you maintain a high idle pressing on the gas pedal,if you can the IAC(idle air control) is the problem,other than that some thing is disconnected.

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If it idles up and down real high, its the throttle body sensor. If it's a low up and down idle and runs rough it is mass air flow meter. If you unplug the mass airflow meter and it will just low idle (no up & down) then the mass air flow meter is bad.

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When i start my car in the mornings to warm up it idles for about 5 minutes then the starts to jump up and down from about 1500 rpms to about 2500 rpms one the car warms up more then its from 1000 to 1500...

Try unplugging the mass air flow sensor and see if it levels out.If so I would change the mass air flow sensor.If not try the same technique with the throttle position sensor.

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