Question about Honda Accord

3 Answers

My 1996 Honda Accord DX was recently rebuilded but the engine takes at least 5 mins to warm up and sounds like it is missing. When I come to a stop, the engine sounds like it wants to turn off. The mechanic who did the work says I need a new Coolant Sensor. This is after I have already paid 2k to fix it. Help!!

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  • fcaldera Sep 16, 2010

    This Honda had 210,000 when it was rebuilt and did not have any problems at all with the idle.
    The gas filter was changed, new spark plugs & wires, plus anew air filter. Check Engine light does NOT come on at all. I asked at my Honda dealership what they thought and they choose the most expensive part could be my problem, Electronic Ar Control Valve or the Fast Idle which comes out to $500.00 in parts alone. I had new heads put on and my Timing Belt with a new water pump replaced. I was leaking a lot of oil from the rear seal so that's why I decided to fix everything.
    I think I made an expensive mistake. The timing belt was worn out though.

  • fcaldera Sep 16, 2010

    Are there any other sensors I have to replace? I have a feeling this guy is going to nickel and dime me for every problem he can think off.

    In my personal opinion, I think the mechanice is just guessing and doesnt really seem to care if it gets fixed or not.

    I just want some good advice to know what to look for so when he says he doesn't know, I can at least be aware he is up to no good.

    Without your adice, I would be guesing too!

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3 Answers

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  • Honda Master
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5 minutes to warm up sounds about right to me, nothing wrong here.For your piece of mind you could ask the mechanic to take a look at the thermostat but i don't think it's necessary.
The mechanic's supposition that the coolant sensor is at fault is correct: an engine on which the fuel/air mixture is off behaves exactly how you described. But since the engine has just been rebuilt it looks much more likely to me that the sensor itself is ok and the electrical connections to it are faulty. So make him check the way this sensor is connected and the wires before spending another $50 on a new sensor.

Posted on Sep 16, 2010

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  • Honda Master
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Replace the thermostat 1st then road test.

Posted on Sep 16, 2010

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  • Master
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The Engine Coolant Temperature (ECT) sensor is a thermistor, which means it's resistance changes in response to engine coolant temperature. The sensor resistance decreases as the coolant temperature increases, and increases as the coolant temperature decreases. This input signal is used by the ECM/PCM help determine the correct air-to-fuel ratio for the engine's operating temperature. The ECM/PCM controls the fuel mixture by controlling how long the electrically triggered fuel injectors stay open. If the ECT sensor is unplugged, the ECM/PCM senses a very high resistance, and the engine may start when cold, however as the engine's temperature increases, a rich running condition will cause the engine to loose power and stall.

Removal procedure

  1. Disconnect the engine wiring harness from the ECT sensor.
  2. Connect an ohmmeter between the two ECT sensor terminals. With the engine cold and the ignition switch in the OFF position, measure and note the ECT sensor resistance.
  3. Connect the engine wiring harness to the sensor.
  4. Start the engine and allow the engine to reach normal operating temperature.
  5. Once the engine has reached normal operating temperature, turn the engine OFF .
  6. Again, disconnect the engine wiring harness from the ECT sensor.
  7. Measure and note the ECT sensor resistance with the engine hot.
  8. The ECT sensor should have 5,000 ohms resistance when the engine coolant temperature is cold. The ECT sensor resistance should decrease as the engine temperature increases. At operating temperature the ECT sensor resistance should be 100-400 ohms.
  9. If readings are not close, the sensor may be faulty.
The repair shop should have done this for you, and I can not see why they would not have in the first place, after spending your money for quality work on your vehicle. I have listed test procedures in case you want to tackle this yourself. The sensor is located in the thermostat housing on the engine.

Posted on Sep 16, 2010

  • 3 more comments 
  • GetMeOttaHere Sep 16, 2010

    Ok, so how do you rate me as somewhat helpful when I did not even get a chance to respond. I answered your original post as it was stated, now there is a whole different picture with a whole lot of info that was not previously mentioned. What are you expecting to achieve if I may ask. I know it is obvious, but are you doing the diagnostics and repairs??????????

  • fcaldera Sep 16, 2010

    Excuse me? I did not rate you at all because there was no button or scale to do that. All I got was a Accept this solution or Ask Another Expert. When I clicked on the Ask Another Expert button, it said to add more info to the previous post. I thought you did a very good job answering. I'm taking the car back to the mechanic and I don't want him charging me more money for what he should have fixed in the first place. If I knew how to fix it myself, I would have never paid for your advice. I feel this mechanic did a sloppy job and I'll take him to court if he doesnt fix my car but I need to be sure that I dont put another 2k into it before he says "Sorry" and takes my money. Sorry if you took this personal!

  • GetMeOttaHere Sep 16, 2010

    You don't have to rate in order to respond. I'm not talking it personal, I just want to know where I stand from a communication and diagnostic stand poit. As I said before, the shop should make this right for you.

  • fcaldera Sep 16, 2010

    I am taking my car back tomorrow morning to the mechanic. I am going to ask him to perform the diagnostic test you responded with to me. I am also going to tell him to change the termostate so I can at least rule out both of your advices to me. If he refuses to do these things, then I'm going to find another mechanic and just take him to court. This job wasn't cheap and he has not made any effort except to say buy more parts!

  • GetMeOttaHere Sep 16, 2010

    I feel bad for you. Your engine should be running correctly after they had it and repaired.Good luck, and be smart about it, don't loose any steam. Small claims court will not cost you a dime and you can recoup some if not all your loses.

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