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Old 06-15-2018, 02:36 PM   #1
Harriers Wake
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Join Date: Dec 2015
Location: Albuquerque NM currently, Pasadena CA born and raised.
Posts: 34
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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, 04:14 PM   #2
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Location: West Chester, Ohio
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fleetw00d is very helpful fleetw00d is very helpful
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
90 LX 4dr 5 spd 374,000 - MRT: http://www.cb7tuner.com/vbb/showthread.php?t=201450
93 LX wagon auto 253,000 - MRT: http://www.cb7tuner.com/vbb/showthread.php?t=208490
92 EX coupe auto 171,151 - MRT: http://www.cb7tuner.com/vbb/showthread.php?t=205114 RIP
92 EX coupe auto 190,000 - MRT: http://www.cb7tuner.com/vbb/showthread.php?t=210341

LOTS of CB7 parts for sale http://www.cb7tuner.com/vbb/showthread.php?t=192583 or watch for banner ad at upper right
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Old 06-19-2018, 11:43 AM   #3
Harriers Wake
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Location: Albuquerque NM currently, Pasadena CA born and raised.
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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, 02:06 PM   #4
G. Wiffington
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Join Date: Mar 2016
Location: Baltimore, Maryland
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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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