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> Rpm Needle Hops After Car Warms Up
silencer25321
post Feb 28 2008, 01:33 AM
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Hi, I have a problem with my car. I recently replaced the MAF sensor because it was supposedly bad but the problem persists. When the car is cold everything runs fine and stays normal, but once it warms up, the RPM needle starts hopping and it doesn't idle. Also, when I try to rev the engine when it is doing this, the car chokes. Please help. This might help ... when I unplug the MAF sensor it idles fine and no problems (New MAF). I have a 1997 eclipse spyder gs (2.4L).
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silencer25321
post Feb 29 2008, 05:29 PM
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Also, the check engine light is on with error code P0505. Can anyone please help?
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Ross1224
post Feb 29 2008, 09:28 PM
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P0505 is showing in my book as an IAC Fault. So maybe you need to check out your Idle Air Controler.
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silencer25321
post Mar 1 2008, 12:33 AM
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Thank You for your reply. Would that be the same as the IAC valve? Or are they 2 diff things?
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Ross1224
post Mar 1 2008, 12:46 AM
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They are the same. Check all your wiring to it before you replace it. PM me if you need to know how to test it. The IAC is about $50 at autozone. Pick up a manual, it makes these little checks on sensors and stuff so much easier. They only cost about $14 at autozone or advance.
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silencer25321
post Mar 1 2008, 08:32 AM
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where is it located? is it under the throttle body and yes please tell me how to check it. I will buy the repair manual today when i go to autozone.
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Ross1224
post Mar 1 2008, 11:33 AM
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Your IAC motor is on your throttle body. It is on the front by the throttle spring.

Check
Make sure your coolant temp sensor is below 68 deg F. (Chill it with ice if necessary.
Listen to the IAC motor while an assistant turns on the car. You should hear a clicking sound. If not check the wiring to the motor. If the harness is good proceed with the following

Disconnect the IAC wiring harness. Looking at the plug on the IAC motor with the locking tab up your terminals should be 1-6 with 1 being at the top left and six at the bottom right. Connect one lead of an ohmmeter to terminal 2. Connect the other lead to terminal 1 and then to 3. The reading should be between 28 and 33 ohms. If not replace the IAC motor. If reading is good proceed to the next step.

Connect lead to terminal 5 and the other to 4 and then 6. You should get the same reading 28-33 ohms. If not replace it.

Hope that makes sense :thumbsup:
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silencer25321
post Mar 1 2008, 03:31 PM
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thank you, i will try this.
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Ross1224
post Mar 1 2008, 06:36 PM
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Keep us informed...
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silencer25321
post Dec 31 2008, 11:00 AM
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How do I tell what model engine I have? I have a 97 mits eclipse spyder 2.4l N/T. Thank You ahead of time!
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calin666
post Dec 31 2008, 11:42 AM
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Here is some info on the engines:

90 - 94
1.8l - 4G37
2.0l Turbo and Non-Turbo - 4G63

95 - 99
2.0l Non-Turbo - Chrysler 420A
2.0l Turbo (also Turbo Spyder)- 4G63
2.4l Non-Turbo (Non-Turbo Spyder only) - 4G64
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silencer25321
post Dec 31 2008, 03:46 PM
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Thank You again, much appreciated!
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pwee05
post Jan 2 2009, 09:41 AM
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Drives: 1996 Talon AWD. Built, but no longer drives: 1997 mitsubishi eclipse RS; 1990 Talon AWD; 1995 Talon AWD, 1997 Talon AWD. Seems like a pattern
did you get that other problem worked out?
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silencer25321
post Apr 30 2009, 05:24 PM
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ok guys ... i know ive been away for a while but finally got most of the codes cleared.
I just have one more code (P1500) which is Manf Cntrl Veh. Spd. Idle Speed Control Auxiliary Inputs.
And the RPM needle still hops and gradually climbs on its own. If anyone could help i would greatly appreciate it. thnx guys.
Oh and by the way just finished changing the IAC Valve.
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silencer25321
post Apr 30 2009, 08:49 PM
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i found out why the rpm would creep up and hop ... the BLISS screw was open to much ... just closed it to keep a nice idle at around 700 RPM ....
But I still have that one Code P1500 ... I was searching around and came across someone that said it might be the Alternator. What do you guys think?
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jonbonazza
post May 3 2009, 08:43 AM
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Its either an open circuit in your alternator fr terminal circuit or your ECU is bad.
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silencer25321
post May 4 2009, 11:28 AM
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What do you mean open Circuit?

Also

I have detected that while the car is on the voltage changes from 14.1 to 12.3 randomly every now and then.
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jonbonazza
post May 4 2009, 04:26 PM
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QUOTE (silencer25321 @ May 4 2009, 12:28 PM) *
What do you mean open Circuit?

Also

I have detected that while the car is on the voltage changes from 14.1 to 12.3 randomly every now and then.


it means a circuit that is not complete. could be disconnected, blown fuse, bad wiring, etc...
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silencer25321
post May 4 2009, 09:10 PM
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oh ok ... i will check it out and look into it .ty
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NWM_Tech
post May 4 2009, 10:59 PM
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QUOTE (silencer25321 @ Apr 30 2009, 08:49 PM) *
i found out why the rpm would creep up and hop ... the BLISS screw was open to much ... just closed it to keep a nice idle at around 700 RPM ....


Yeah, someone tried to compensate for the bad IAC by bumping the idle
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