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Old 06-15-2018, 01:36 PM   #1
Harriers Wake
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Surging idle corrected by hard acceleration/Check engine light?

So something odd happened the other day. My '90 LX has a surging idle whenever the clutch is depressed. A fairly common issue that I've yet to remedy as I barely ever drive the car. I understand the need to do a vacuum leak search, clean or replace the IACV, etc. I drove the car for the first time in a couple months the other day and decided to get on her pretty hard because (let's face it) it's fun even if they're not exactly rocket ships stock. So I wind her up to almost redline in first and shift to 2nd. I catch a check engine light so I back off and depress the clutch. No surging idle. In fact it's dead set at 1500 rpm, not even a hint of a waver. It's like this all the way home. Park, kill it and fire her up again. No Check engine light and the dreaded surging idle has returned. Anybody know what's happening here?
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Old 06-15-2018, 03:14 PM   #2
fleetw00d
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First thing would be to pull the code (it should still be in the ECM memory). Surging idle many times is the Fast Idle Thermo Valve (FITV): http://www.cb7tuner.com/vbb/showthread.php?t=206012
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Old 06-19-2018, 10:43 AM   #3
Harriers Wake
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Thank you sir, If I take it to autozone will they be able to run the codes? Also, thanks for the link, I will check it out.
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Old 06-21-2018, 01:06 PM   #4
G. Wiffington
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Just use the blue service connector that is located under the dashboard on the passenger's side.

There are links on here about how to do this.

Put a paperclip in the connector to "jump" it. Turn the key to the on position.
Then you will see the Check Engine Light blink. A long blink indicates the first number of the code (10). The short, quick blink represents the second number of the code (1).

Here is the Thread: http://www.cb7tuner.com/vbb/showthread.php?t=21259
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