High Idle, then Low. - Nissan Frontier Forum
 
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#1 (permalink) Old 11-17-2011, 08:48 PM
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High Idle, then Low.

I replaced my TPS(Throttle Position Sensor) on my truck since it was a bad sensor, cost about $100 or so. Once i replaced it, my truck idled at 2000 RPMs, it always seemed to stay like this and whenever i shift it into drive the RPMs drop down to about 1000, more or less. After i replaced the TPS, i had to replace the Knock Sensor since it was bad also.

Is this normal? My instructor said that it should be back to normal once i drive it around for the knock and TPS sensor to adjust.

2001 Nissan Frontier XE 3.3L V6
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#2 (permalink) Old 11-17-2011, 10:03 PM
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Did you replace the knock sensor in the stock location? If so, are you sure nothing was damaged or left disconnected during reassembly? Also note that the TPS can be physically adjusted, it's not something you simply install and forget. Consult a service manual for adjustment procedures if you haven't already.

2002 XE CC LB 4x4
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#3 (permalink) Old 11-17-2011, 11:41 PM
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I also had this problem when I adjusted my idle. I did the adjustment to reset my idle because it seemed to idle around 1100 rpm. After I did the adjustment it took a couple of days and now after the engine is warm it idles nice and smooth at about 700 rpm. I would give it a couple days and see what happens. The pcm has to relearn with the new sensor installed. You can buy a Haynes Repair Manual and it will tell you everything about the TPS and how to adjust it.

Last edited by Riz; 11-17-2011 at 11:55 PM.
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#4 (permalink) Old 11-18-2011, 01:17 AM
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Knock sensor is in the same location as it was before, in the intake. I checked the connectors before I put the new sensor in. Connections were good, but the knock sensor was bad. I do know that it can be physically adjusted, i tried this and it just pushed my RPMs higher. I turned my TPS so that it wouldn't open the throttle or keep it open, and it just sat at 2000 RPMs, so if i adjust the TPS to open the throttle, it pushes the RPMs higher. I have a Haynes Repair Manual sitting in my garage, didn't think they would have anything about a TPS, I'll look that up. Thanks! I have an EVAP something malfunction code, i believe its a P0450. Would that have anything to deal with a high idle? EVAP is dealing with fuel, right?

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