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Old 01-05-2009, 06:56 PM   #1
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Idle speed

Hey gents another small issue. After putting in a thermostat when there wasn't one to begin with, the idle speed is all over the place. At idle it's at pretty cose to 1000, sometimes it will come down to 800. It tripped the check engine light, but then that went off and seemed to be idleing ok. Then the check engine light went back on and it started to idle high again. I pulled the throttle body off today, carb cleaned the whole thing including the idle air control and the throttle positioning sensor. Started up fine then went to idle at around 2000. Every time I stop at a light it idles at something different. If I neutral drop it while im rolling it bounces or surges between 1000 and 2000. Is the idle air controller shot, or maybe the computer is trying to re learn. I put about ten miles on it after putting the throttle body back on.

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Old 01-05-2009, 07:43 PM   #2
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How did you clean the IAC?

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Old 01-05-2009, 08:18 PM   #3
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Jerry, I cleaned the metal caseing of the idle speed control with carb cleaner. I then spayed a small amount on the sensor and wiped it with a towel, I tried not to spin it in any way. I just drove to work about ten miles on the freeway and the middle headers were glowing red.
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Old 01-05-2009, 08:22 PM   #4
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With glowing headers, it sounds like you've got a different issue. Possibly a bad upstream 02 sensor but that's just a WAG.
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Old 01-05-2009, 10:06 PM   #5
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What is a WAG? Does it sound like the idle speed sensor is shot?
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Old 01-06-2009, 04:35 AM   #6
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Yeah all of the headers are glowing bright red, idle speed is very high around 2000 rpm now.
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Old 01-06-2009, 02:48 PM   #7
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So it started after you installed the thermostat, remove the thermostat and see how it runs, just curious if you installed the correct thermostat and is it installed properly
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Old 01-06-2009, 03:38 PM   #8
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When I put the thermostat in I changed the oil and tightened up the header, basically just went along the the top snug down the top didn't put my wieght into it, and tightened the collector bolts. I just got back from autozone its throwing a p1294 code which says definition: Target idle speed not reached Explination: No other code set; ECM detected idle speed not within specified range. Probable causes 1. Mechanical prob vaccum leak, 2. Throttle cable not free 3. Idle speed screw mis adjusted. I think I may just pull the thermostat back out, see what happens or pull the intake and exaust manifolds off and see if I cracked them somehow. Any suggestions would be swell. Thanks, Chris
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Old 01-06-2009, 03:42 PM   #9
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Oh and I checked all three on the list no vaccum leak that I could see, Throttle cable is fine, and I never touched the idle speed screw, I don't even see one.
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Old 01-07-2009, 06:49 PM   #10
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First, a WAG is a wild ass guess. A SWAG is a scientific wild ass guess. Also, there is no idle control screw. That ability went out when computers took over that function.

Has the intake manifold ever been pulled/replaced for any reason? How are your power brakes? Working normally?
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Old 01-07-2009, 06:53 PM   #11
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I had the same problem.
After many hours I figured out, that the electrical connector in the center of the big hose from the air box to the engine (sorry, I don´t know the English word for that part) was dirty and had a loose connection. I cleaned it and the problem was gone.


EDIT:

I´m talking about this connector. Sorry I have no better picture...

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Old 01-07-2009, 09:45 PM   #12
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On the big hose, I have a AEM brute force air intake and there is nothing electrical hooked to it, I'll take a look though, cause it does seem electrical. Jerry, Breaks work perfect and yes, I replaced my exhaust manifold to the Banks about six months ago and it worked perfect till I put in that Thermostat.
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Old 01-07-2009, 10:18 PM   #13
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"""""no vaccum leak that I could see, """""

It's very rare you can SEE a vacuum leak unless it sucks in your first born.

Use a BURNABLE carb cleaner to test it. Most are not BURNABLE. Test it by dribbling a few drops down the intake - if it's BURNABLE it'll raise the RPM. Most won't, like water, they drop the R's slightly. (Gumout works.)

Once you have the right stuff, spray it on the area where a leak might occur - throttle body base plate, along the joint between the head and intake manifold etc - top and bottom.
When you hit the leak, R's will jump up.

Caution - spraying a liquid around forms puddles, if they ignite you have a nice fire, bring marshmallows.
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Old 01-08-2009, 01:55 AM   #14
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Yeah crappy wording on my part there. This happened as a direct result of the thermostat, I didn't mess with anything by the vaccum hoses I inspected each one but will definetly give your idea a shot. I'm running out of ideas. I think I'm gonna pull the thermostat back out and see what happens. I might be able to tear it appart tomorrow, just depends I'll be at the CES show for a bit to check out the new electronic stuff.
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Old 01-08-2009, 03:17 AM   #15
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from some research people report finding a vac leak. Do u have all the gaskets on there properly? is everything tight?

do u have any colored smoke out the tail pipe? Any smell out of there? French fries? Candy? anything?

P1294. "Injector High Side Open - Bank 2/Target idle not reached"
Target RPM not achieved during drive idle condition, possible vacuum leak or lost IAC steps.

last resort pull the plugs to see how they look.
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Old 01-08-2009, 02:54 PM   #16
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The only gasket I replaced was the thermostat gasket. I did the headers well over 6 months ago. There is no odd smells no oders, and no smoke coming out of the muffler or engine compartment. Just high idle once it gets warm, along with eratic idle if u nuetral drop it coming to a light.
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Old 01-17-2009, 07:07 PM   #17
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Just an FYI, it ended up being a intake exhaust gasket leak. Replaced the gasket, good as new. Thanks for the help.
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Old 01-18-2009, 02:39 AM   #18
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Quote:
Originally Posted by 06R1Raven01TJ View Post
Just an FYI, it ended up being a intake exhaust gasket leak.
intake exhaust? which one? Its good you reported back. Finally putting a . to the open question. A big problem with other forums. New users come over, post a question, people give them ideas. New users leave after something someone recommended fixes it and then those questions never get results with what the problem is.

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