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Old 10-06-2005, 12:49 PM   #1
BerinG
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Temp gauge and Neutral RPM problem

My car has been acting weird in teh last week. Sometimes everything would be fine, and all of a sudden my temp gauge would go down to slowly from middle (normal) to low low.. when i did that, the rpms would go up to like 2000rpm and stay there.. so i'd be at like 2000rpm at a stop light, and then all of a sudden the temp gauge goes back up to middle as it should be, rpm goes down, and high speed fan turns on.. I really have no idea what it could be.When the rpms to go down, it doesn't stall or come close either so im thinking its not overheating even though the fan turns on and the temp gauge doesn't work properly. Then, another day passes and everything is fine, car runs perfect.

This morning coming to work, same deal, everything is normal, all of a sudden temp gauge goes down to almost zero and the rpms go up to like 3000rpms.. at this point i turned the car off.. and started it up again, and the rpms jump right back to 3000rpm and gauge is still not showing normal temp. Then the rpms start to drop slowly and then completely down to 800 and now the temp gauge is back in the middle where it should

At first i thought it might just be a coincidence that the 2 happened but now im sure they are related caus theres never one problem without the other.

It never goes OVER the middle.. so i don't know.. maybe the temperature sensor is gone and the ecu thinks its -100 degrees and gives the car a 5:1 a/f ratio ...

I could understand if the idle went up a bit if the car thought it was cold but 3000rpms seems a bit high in any conditions..

thank you


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Old 10-06-2005, 02:14 PM   #2
hEaT
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Sounds like the thermostat. I've started my car up on some mornings recently where it was about 40 and the car started at 2k and dropped down. I don't think I've ever hit 3k on a cold start though and that's with mornings below 0. Something definitley isn't right.
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Old 10-06-2005, 02:24 PM   #3
BerinG
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i finally got a code.. p1289..Cylinder Head Temp Sensor High Input

so i looked in my shop manual for where it was.. look at the harness and it was plugged and still holding but it wasn't "clicked in" .. ive changed my intake manifold a few weeks back and had to unplug about 10 sensors so thats probably when it happened.. but it had been working fine for the last month or so..

anyway went for a drive and it hasn't done it since so i assume that was it..

im so happy.. i just bought a house and im signing next week.. i can't throw money at the car to fix stuff like that anymore..
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Old 10-06-2005, 02:49 PM   #4
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"i finally got a code.. p1289.."

Sorta nice to have OBD-II nowadays. It isn't always right, but often it points you right to the problem. Without OBD codes, it might have taken quite a while to fgure that one out.
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Old 01-06-2008, 12:11 PM   #5
Spork Sports
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My car just threw a P1289 code, and is doing exactly as described in the first post.

In the Chiltons manual it says to remove the alternator. Is there any way around this? Anybody have any experience with this?
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