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Old 12-11-2007, 13:52   #1 (permalink)
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Weird idle problems

Hi. I have a 97 escort with a manual transmission. Today while I was driving home and was stopped the idle rpms were moving up and down from about 500 to 1500. It did it at a couple of other stops and to keep the car from dying I had to keep my foot on the gas. I just had an oil change a few days ago and the air filter was replaced. Im really not sure what to do about it. Any help?
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Old 08-06-2008, 01:50   #2 (permalink)
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Re: Weird idle problems

Hate to bring up a dead post. But I recently experienced an idle problem with my 01 zx2.
It started the dreaded Low Idle to fast idle.
I started searching the engine over for loose wires, checking sensors, Plugs..etc.

Long story short. I ended up replacing all the vacuum lines on the back of the plenum. Still didn't help.....There is one vacuum line that is hidden. Under the throttle body. it runs from the beside the water pump to the bottom of the intake. There...it had dry rotted.


Just thought I would throw it out there....check your vacuum lines well.
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Old 08-22-2008, 19:42   #3 (permalink)
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Re: Weird idle problems

Quote:
Originally Posted by rescue76 View Post
Hate to bring up a dead post. But I recently experienced an idle problem with my 01 zx2.
It started the dreaded Low Idle to fast idle.
I started searching the engine over for loose wires, checking sensors, Plugs..etc.

Long story short. I ended up replacing all the vacuum lines on the back of the plenum. Still didn't help.....There is one vacuum line that is hidden. Under the throttle body. it runs from the beside the water pump to the bottom of the intake. There...it had dry rotted.


Just thought I would throw it out there....check your vacuum lines well.
Checking the Vac lines is a possibility, but I would start with the MAS..(Mass Air flow Sensor), and the TPS..(Throttle body Positioning Sensor).

Have you gotten a Engine Lite yet?...if so go to Auto Zone, or Advance Auto, and have the Error Codes Read.
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Old 01-06-2009, 06:44   #4 (permalink)
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Re: Weird idle problems

I'm getting the same thing here with my 95 4 door. 600-1500, up and down, up and down. No particular time of the day or reason. It starts, then stops.

I had my wife in the car when it started one time - she started giving me these looks. I had to go through this little "It's not ME, the car is doing it - all by itself...". She didn't believe, so I took my left foot off the gas and showed her. "See, the car is doing this, all by itself".

My guess is it is electrics. Some sensor telling the computer wrong data.


Quote:
Originally Posted by mrroboto89 View Post
Hi. I have a 97 escort with a manual transmission. Today while I was driving home and was stopped the idle rpms were moving up and down from about 500 to 1500. It did it at a couple of other stops and to keep the car from dying I had to keep my foot on the gas. I just had an oil change a few days ago and the air filter was replaced. Im really not sure what to do about it. Any help?
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Old 02-01-2009, 03:43   #5 (permalink)
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Re: Weird idle problems

We have a similar problem, Irratic idle, fluctuating between almost/ sometimes stall and 2000 rpm. its getting worse.. I have gotten hold of techdata for sensors etc all seem to be ok. i do have a couple of weird sensor readings..... although the electical resistance of the TPS and 5V across it are correct, the data i have says that i should have a varying voltage between pin 16 on the ECU and another on the TPS wiper pin. it corresponds to throttle position. but i read ZERO all the time. PIN 16 is grounded as it should be. and i can pick up the varying voltage between the beginning or end of the TP track and the wiper connection.

the other weirdo is 5000 ohms from air sensor and aparently it should be 2.5 ohms... but again i have a voltage present that agrees with idle and 2000 rpm airflow.....

any ideas......
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Old 02-08-2009, 04:17   #6 (permalink)
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Re: Weird idle problems (SOLVED)

Dunno really what the cause was this time.... but it seems that a geally good squirt of carb cleaner into the mass airflow sensor pipe and into the throttle body has fixed it for now.... a mate reakons that the idle air control valve was stuck.... so fingers crossed.... hope this helps
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