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Old 04-21-2014, 01:39 PM   #1
Dannoel
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Default ECTS change, yet the problem persists

So I have been having some intermittent idle issues. My car runs fine otherwise but from time to time if I put it in park after driving for a while my RPM will jump up to around 2000. I had also noticed that my temp gauge tended to stay around the 1/4 mark all the time so I decided to change the ECTS. I followed the directions in Wolfman's how-to post and it was a really easy job. The old resin sensor was indeed cracked but the connector/wires looked good and no coolant was leaking. My temp gauge now appears to be correct but the idle problem is still there. I'm thinking it may be the TPS, because shutting off the car and starting it back up makes it idle normally (800-900 RPM).
Just want to know if yall' think I'm on the right track before I go buy a TPS. Thanks for the help.

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Old 04-21-2014, 01:51 PM   #2
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Default Re: ECTS change, yet the problem persists

When the fast idle consistently corrects if you shut off and restart the engine, the TPS is suspect. I replaced mine several years ago after a long bout with a 1700 rpm idle and the problem has never returned.

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Old 04-21-2014, 02:57 PM   #3
ddeuces22
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Default Re: ECTS change, yet the problem persists

It's either that or a vacuum leak at cyl 1 intake manifold gasket. 3rd gens are notorious for this due to a wrinkle in the gasket.

You can either a.) observe your tps reading with a scan tool when your idle escalates. If it stays at 0 while idle rises it's not your tps sensor, if your tps % goes up with your idle and your not pressing the gas pedal then your tps is shot

B.) check for the vacuum leak with some carb cleaner. Spray at the intake manifold gasket right at cyl 1 and if your idle changes when you spray then you have a vacuum leak and that's what's causing your idle

Simply turning your car on and off is one way to get an idea the tps is going, it's nice to be sure though and those tests will determine that

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Old 04-21-2014, 05:26 PM   #4
Dannoel
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Default Re: ECTS change, yet the problem persists

Okay, I'll pick up some carb cleaner and check that first. I plan on getting my own OBDII code reader/real time scanner soon so if I don't find a vacuum leak then I'll check the TPS reading before I go buy a sensor.

...
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Old 04-21-2014, 09:35 PM   #5
SLfun
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Default Re: ECTS change, yet the problem persists

Before you buy any parts, clean the throttle body, make sure there it is sparkly clean. The slightest bit of crud can hold the t plate open just enough to make the idle high or low or just plain crappy.

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Old 04-21-2014, 11:08 PM   #6
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Default Re: ECTS change, yet the problem persists

Quote:
Originally Posted by SLfun View Post
Before you buy any parts, clean the throttle body, make sure there it is sparkly clean. The slightest bit of crud can hold the t plate open just enough to make the idle high or low or just plain crappy.
Is there any specific method to cleaning it?
What sort of cleaner would you suggest I use?

...
Dan

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Old 04-22-2014, 01:27 AM   #7
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Default Re: ECTS change, yet the problem persists

Quote:
Originally Posted by Dannoel View Post
Is there any specific method to cleaning it?
What sort of cleaner would you suggest I use?
Brake cleaner or throttle body cleaner are good. You might use an old toothbrush or smaller brush to scrub inside the cavities, too.

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Old 04-25-2014, 03:06 PM   #8
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Default Re: ECTS change, yet the problem persists

I received the OBDII reader that I ordered in the mail. I went for a short drive to make the problem appear and when I got back and put it in park it was idling around 2000 RPM. I plugged up my OBDII scanner and it showed that the absolute throttle position was 2.7%. I turned the car off for 5 seconds and turned it back on. The RPM went up to 1500 for a second then went down to about 900 and the absolute throttle position read 0%. So does this mean the sensor is shot? Or could a good throttle body cleaning still take care of it?

...
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Old 04-25-2014, 03:20 PM   #9
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Default Re: ECTS change, yet the problem persists

If you didn't touch the gas pedal between it idleing at 2000rpm @ 2.7% throttle and restarting at 900rpm @ 0% throttle than it's the sensor.

It's never a bad idea to clean the throttle body, and it's much much easier to take the TPS off with the throttle body off. You'll do a better cleaning of it with it off.

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Old 04-25-2014, 04:03 PM   #10
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Default Re: ECTS change, yet the problem persists

Quote:
Originally Posted by fetchitfido View Post
If you didn't touch the gas pedal between it idleing at 2000rpm @ 2.7% throttle and restarting at 900rpm @ 0% throttle than it's the sensor.

It's never a bad idea to clean the throttle body, and it's much much easier to take the TPS off with the throttle body off. You'll do a better cleaning of it with it off.
I watched Richpin's throttle body cleaning video and his TPS changing video. Looked to me like changing the TPS would be a lot easier to do with the throttle body off.
Thanks everyone, I'll let y'all know if it takes care of the problem.

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Old 04-25-2014, 08:05 PM   #11
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Default Re: ECTS change, yet the problem persists

Quote:
Originally Posted by Dannoel View Post
I had also noticed that my temp gauge tended to stay around the 1/4 mark all the time so I decided to change the ECTS.
If the ects did not correct the temp gauge reading then you need a thermostat. The gauge should read between 3/8 and 1/2 when fully warmed up.

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Old 05-11-2014, 08:10 AM   #12
Dannoel
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Default Re: ECTS change, yet the problem persists

I'm a little late on this update, but I changed the TPS last Sunday and gave the throttle body a thorough cleaning. During my drive to church, my temp gauge fully redlined, which made absolutely no sense because its only a 5 minute drive to church and it was a cool morning. When I got back home I pulled out the ECTS and found that the whole brass tip was gone. I'm not sure how on earth this happened but I showed the piece to an old mechanic buddy of mine and he said that it must have been defective when I bought it (it was Duralast brand). So I picked up another ECTS and installed it. The difference is absolutely amazing! I feel like I have a whole new car. The high idle is gone, the accelerator was a little sticky and that's gone, the engine feels a little peppier, and my MPG's have gone from 31 to 36! I couldn't be happier, thanks everyone for the helpful info!

...
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Old 05-11-2014, 08:23 AM   #13
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Default Re: ECTS change, yet the problem persists

The brass tip was gone, wow.

Glad you got it corrected, it's amazing how much control those buggers have!

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