Engine surge/idle ECU relearn solved - Nissan Versa Forums
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post #1 of 4 Old 08-25-2017, 08:15 AM Thread Starter
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Engine surge/idle ECU relearn solved

See the long story below of electrical connector, engine surge, etc posted below. I have done the online ECU, throttle position relearn procedure at least 20 times with no help. I have been driving my Versa to work the past 2 days. At every shut down I do the relearn procedure with no help. Last night I did the procedure again on a hot engine. This time as soon as the check engine light stopped blinking I started the car and it still surged between 1000 and 2200 rpm so I put it in 1st and slowly let out the clutch and brought the engine speed to idle-650rpm. When I pushed the clutch back in the Rpm stayed there. That hasn't happened since I replaced the head. The rpm hunted around 500 - 800 rpm for about 20 seconds then settled down to 650. I reved it a couple times and each time it went right back to 650. I let it run a bit and was hesitant to turn off the engine. I didn't want the surge problem to return. After shut down and restart it went right back to 650. Its been running normal now. That was a long frustrating process and I'm very thankful to be done with that. Hopefully everyone adds a step to the relearn procedure to bring the engine to idle with the clutch immediately after doing the relearn procedure. It may work for an automatic also if you put it in drive and put your foot on the brake. Oh by the way, the electrical connector is still laying loose with no place to connect to. I'm convinced it must be a connector for an auto transmission. Thanks for the forum. Hopefully this will help someone in the future
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post #2 of 4 Old 08-25-2017, 02:00 PM
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Don't be too sure it's fixed, vacuum leak issues can do that and often. I chased one down for over a year when it would repeatedly fix itself to not do it at all for weeks at a time until it showed up again. Finally found it and done permanently then.

Your method will not be an OEM approved one as you can damage the clutch doing that.

Just sayin' and I hope it works out for you. But be ready............
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post #3 of 4 Old 08-25-2017, 11:57 PM
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When I had a vacuum leak I had a high idle about 2 thousand rpms and a check engine light regarding lean condition or some technical phrase like injector out of range or something.

A quick spray of something under the hood should of pointed that out.

Like amc said, Ive seen some 4 bangers with boots and suck rubber cuplands that flex when the engine twist and split leaking in air. Then when the engine idles its seated.
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post #4 of 4 Old 08-26-2017, 01:41 PM
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You can get say a leak across an internal idle bypass passage at TB/manifold that will not show on the outside if the engine uses an IAC.

Fuel soaked rubber hose can then bubblegum up to suck a soft-walled hole in it to then reseal up and run fine until it does it again and drives you nuts.

If electronic TB then the TB aircrack can get buildup on it at the butterfly edges that then affects the aircrack there and then engine can have issues trying to decide where to put the throttle blade at idle. The surge being that, TB tries to drop back where it was used to running before the buildup and too low idle, then ECM tells it to open for greater rpm and too much and then it goes into a cycling surge between the two.
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