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92 corolla manual idles up and down while in neutral and engine temp increases to the max.Radiator is cold

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Try replaceing the engine temperature senser,it may cure both problems.If it does'nt fix the surging the try a throttle position senser.

Posted on Nov 16, 2009

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My heating just stopped working as I was driving what can be wrong with it


Check your coolant level after the engine has cooled and check radiator reservoir also . Its best to check with the engine cold because it more of a precise level then with the engine at operating temp. Plus you take a chance a getting burned really bad checking the antifreeze with the engine at operating temp also. On the side of the reservoir is a max fill line somewhere about half way down and with the engine cold,that's where the antifreeze level should be when its full. The reason the max line isn't at the top is because of expansion when the engine temp rises. Good luck and stay safe and keep us posted!

Dec 26, 2015 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Why does my heater blow cold at idle


  1. You May perform the following with the vehicle in park or neutral with emergency brake firmly on.
  2. Check the coolant level when the engine is cold. With proper coolant, fill radiator to top and reservoir to the COLD LEVEL mark.
  3. With radiator cap off, start the engine and let it idle.
  4. After 10 minutes of running at idle, you should observe a coolant flow in the radiator.
  5. if you observe flow, reach inside car and turn on the heater to high and max temp.
  6. Now observe the radiator fill level. If the level has dropped substantially, add more coolant to the system to the top. the coolant should be warm or even HOT. If it fails this observation go to #8
  7. If so, replace the caps on your system. Take the vehicle for a short drive and check your heat at an idle inside the car. It should be normal if you have made all the above observations.
  8. If coolant remains cool or cold, it is likely a faulty component. A bad thermostat will cause this symptom. Faulty servos or valves that control the flow of air in the cab.
  9. There could still be air in the system. Some systems are actually higher on the engine components than the filling points and have to have the air bled off.
  10. You may consider a qualified service Mechanic to make the repairs.

Dec 18, 2015 | Cars & Trucks

1 Answer

Normal idling speed


A manual transmission is about 400 RPM and and automatic is about 700. When you put the automatic in gear it will drop by about 200. When the engine is cold you can be about 1100.

Mar 28, 2014 | 2005 Toyota Corolla

1 Answer

What is an OBD code 51 on 1990 toyota corolla 1.6L 4A-FE and how to test?


Well this answer is going to be a bit fuzzy.
Code 51 is for a switch signal issue. The possible causes are the throttle position switch, the neutral safety switch, and the ac compressor switch. One of those three is not sending a signal to the computer. So if its the ac switch, you know why.
But all three would need to be checked out.

Feb 06, 2014 | 1990 Toyota Corolla

1 Answer

2005 Honda Pilot. Temp guage goes up but then comes back down to half when the a/c or defrost is on. If sitting in traffic is still goes up until moving again.


There are several possible problems causing the temp increase.
  1. Low coolant level
  2. Leak in radiator hose
  3. Leak in radiator
  4. Bad waterpump
With low coolant levels by any 1 or a combination of 1-4, the vehicle will run hot at low speeds and at idle. Running the AC or heater pushes the remaining coolant through the system faster, aiding in cooling the engine but all indications are you've definitely have a cooling system issue that should be looked at immediately before doing damage. If the coolant level is good (when car is cold, open radiator cap and check for coolant level), the issue most likely lies in the waterpump.

May 04, 2011 | 2005 Honda Pilot

2 Answers

I am not sure if the radiator fan is working on my 92 v6 camry its not over heating but never see or hear the fan running is there a fuse or relay that might have gone out. I cant even see any wires that...


The radiator fan in the 92-95 models of V-6 Toyota and Lexus vehicles is a weird design. The fan is not electric but runs off the power steering pump. The power steering pump moves fluid through hoses to the radiator fan, thereby creating its rotation. A sensor monitors coolant temperature and signals a solenoid on the power steering pump when more or less cooling is needed. The power steering pump then speeds up or slows down to provide more or less fan speed.

This system seems to work pretty well. However, there is a connector that goes to the power steering pump that is critical to proper operation. In engine work this connector often gets overlooked when reassembly is done. This results in the fan running at constant speed and not increasing rotation when more cooling is needed. This becomes a problem primarily when the car is idling or moving at a slow speed.

If your car is not overheating in these situations, the fan is probably operating okay.

Oct 20, 2009 | 1992 Toyota Camry V6

1 Answer

Idles up and down after warm up


THE COOLANT LEVEL IS LOW

on the older hondas even the newer ones idle speed is coolant temp controlled.

when the engine idles up the electronic coolant temp sensor is submerged in coolant and reads warm, so the engine computer idles the car down. the coolant level if low than drops from around the coolant temp sensor and it says the engine is cold, so the engine computer idles the car up.

which results in the constant rise and fall in engine rpm.

ADD COOLANT TO THE RADIATOR AND WATCH THE CAR MAGICALLY FIX ITSELF.

Apr 10, 2009 | 1993 Honda Accord

1 Answer

Corolla repair manual


can y tell me what enigne size ?

Mar 23, 2009 | 1993 Toyota Corolla

1 Answer

Overheating engine: termo guage at the middle during idle


The Temp gauge should read in the middle of the gauge at operating temperature. This is normal. The radiator fan should come on after idling (not driving) for 20 minutes. The fan should also come on when you turn on the AC. Are you experiencing overheat problems?
Please reply if you have overheating issues.

Oct 16, 2008 | 1994 Toyota Corolla

1 Answer

I have a Toyota corolla 2002. It is only 56'000 miles. Recently the gas mileage becomes so bad. It gives like 21 MPG. There is no check engine light. I changed the air filter and checked out the sparkles...


I have seen this problem countless times, and no computer can give you the answer, The problem is your ECT. The Engine Coolant Temp sensor. It tells the computer what temp the engine is at and it uses this input to regulate the fuel. When the engine is cold, the fuel is increased to act as the choke for easier starting. As the engine warms up, the fuel is cut back. When the sensor locks cold, the computer runs the engine in choke mode all the time, sending the fuel ecom\nomy down the toilet.

Jul 28, 2008 | 2006 Toyota Corolla

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