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dies when i take foot off the accelerator


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zoggnoff
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May 19, 2009, 5:52 PM

Post #1 of 15 (3313 views)
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I have to step on the gas to get the engine started and when I take my foot off the pedal the rpm gauge falls drastically til it dies. what could be causing this problem?

it's an '03 eclipse gt 3.0L 6cyl


Hammer Time
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May 19, 2009, 5:55 PM

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You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.




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Loren Champlain Sr
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May 19, 2009, 7:07 PM

Post #3 of 15 (3301 views)
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zoggnoff; Does this occur when the engine is cold, hot, or both? If you are having to open the throttle, that's telling me that it is getting too much fuel and not enough air.
Loren
SW Washington


Hammer Time
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May 19, 2009, 7:42 PM

Post #4 of 15 (3298 views)
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Quote
zoggnoff; Does this occur when the engine is cold, hot, or both? If you are having to open the throttle, that's telling me that it is getting too much fuel and not enough air.


Also a symptom of a stuck closed IAC.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Loren Champlain Sr
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May 19, 2009, 7:44 PM

Post #5 of 15 (3294 views)
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Absolutely. I thought about that after I replied. Same thing, huh? Lack of air. Oooops.
Loren
SW Washington


zoggnoff
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May 20, 2009, 12:22 AM

Post #6 of 15 (3285 views)
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In Reply To
zoggnoff; Does this occur when the engine is cold, hot, or both? If you are having to open the throttle, that's telling me that it is getting too much fuel and not enough air.



It's like this, I get in, turn the key, hear the engine turning but not starting, so I step on the gas and vroom it starts up but then the RPMs fall and it dies. I say both.

When this recent problem happened I had the engine running, car parked and the AC on high.
That's significant because over the past year I could never run the AC at idle without it stalling until about a week ago when I replaced the radiator and did an oil change.

I was really amazed at how well it ran after that until all this happened...


zoggnoff
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May 20, 2009, 12:25 AM

Post #7 of 15 (3281 views)
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In Reply To
You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.



i'll give it a shot


Loren Champlain Sr
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May 20, 2009, 6:41 PM

Post #8 of 15 (3257 views)
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>>when I replaced the radiator and did an oil change<< The plot thickens! Check the cooling system to make certain that it is full (that there are no air pockets). If the CTS (coolant temp sensor) isn't fully immersed in coolant, the PCM won't get the proper reading for fuel delivery.
Loren
SW Washington


zoggnoff
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May 21, 2009, 3:08 AM

Post #9 of 15 (3251 views)
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>>when I replaced the radiator and did an oil change<< The plot thickens! Check the cooling system to make certain that it is full (that there are no air pockets). If the CTS (coolant temp sensor) isn't fully immersed in coolant, the PCM won't get the proper reading for fuel delivery.



plot thickens :)

sorry i didn't mention it before - the book said 8.4 quarts of antifreeze but i was only able to put 4 quarts in.
How would I go about looking for air pockets?

I took the air assembly off, the throttle body out, removed the IAC motor, sprayed and scrubbed all the carbon off.
I was able to retract the pintle on the IAC so i think it might be alright but i'm going to test it with an ohm meter.


zoggnoff
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May 24, 2009, 6:03 PM

Post #10 of 15 (3206 views)
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In Reply To
You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.



Okay I removed the throttle body and cleaned it up, still waiting for new throttle body gasket, will have monday.
I bought a multimeter to test the IAC and the book says it should read between 28 and 33 ohms on all connectors.
the top connectors give a reading of over 29 ohms.
the bottom reads 27.8 ohms on the left and 1.2 ohms on the right.

Where can I get one of these that won't brake my wallet?


Hammer Time
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May 25, 2009, 11:48 AM

Post #11 of 15 (3194 views)
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You'll have to check the discount parts storers to see if they make an aftermarket version for that car. If nnot, you'll be stuck with the dealer.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



zoggnoff
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May 26, 2009, 12:06 AM

Post #12 of 15 (3181 views)
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In Reply To
You'll have to check the discount parts storers to see if they make an aftermarket version for that car. If nnot, you'll be stuck with the dealer.



I found an IAC from a salvage yard that was in a 4 cylinder 2.4L mitsubishi.
I have not bought it yet because I wanted to get your opinion.
My engine is the 6 cylinder 3.0L, will this work in my car?

It has the same dimensions as my old one as far as screwing and plugging it in goes.
Around the motor itself though it appears to be more round than the old one.

The only markings I have found on the old one are 5611 and the new one has 9ZG1

What do you say?


zoggnoff
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May 26, 2009, 1:47 AM

Post #13 of 15 (3176 views)
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Here is a picture of the IAC 3.0L part that broke. I looked it up in CAPS and the part number is MD628174


This is the used part for the 2.4L

Used part 2.4L different angle


Hammer Time
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May 26, 2009, 9:11 AM

Post #14 of 15 (3164 views)
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I'm not a fan of used parts but they appear the same in the picture.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



zoggnoff
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Jun 8, 2009, 10:59 PM

Post #15 of 15 (3118 views)
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I went with the new part.
she runs again.
idle seems to be high, around 1500.
did not bother with the anti-freeze other than replacing what I drained.
bought the mikunni brand.




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