high idle

TGP Nick · March 07, 2008, 12:13:30 PM

a 2.8 ECM will work as well.

Prospeeder · March 07, 2008, 02:50:19 PM

I was just gonna take the ECM out of my 3.1 6000. Thatll work right? I didnt think it HAD to be from a Wbody.

dogbone · March 07, 2008, 03:38:05 PM

If you look at it there is a fairly long number on the side of it, I bought mine from GM and definitely overpaid, I checked on e-bay and there are quite a few for sale, I emailed a bunch of them with the part number and 1 guy got back to me, 35-40 bucks I think. I'll check to see if I saved him in my favorites, but I don't think I did, unfortunately he got back to me after I broke down and got one from GM.

*I checked I didn't save the ECM guy from e-bay, I really think the numbers have to match whats in it now if you try to use another one.

grinders_18 · March 07, 2008, 04:01:14 PM

I have a TGP ECM if you want? $20 and shipping sound good? I bought it for the chip and got the ECM with it.

Prospeeder · March 08, 2008, 02:41:47 AM

maybe, give me a week or so, i need paid.

Prospeeder · March 08, 2008, 11:25:20 AM

So the ECM out of my 6000 Wont work to see if thats the problem? no one really said

Prospeeder · March 08, 2008, 01:33:28 PM

Oook So I got a new ECM, no fix, went and cleaned the hell out of the IAC motor and the inside of the TB, kinda dirty, but no change, Car still does it, idle shoots up when started and takes forever to come down. I sprayed carb cleaner everywhere in hopes to find some vacuum leak, none. Im out of ideas. Heres a few vids, Tell me if im just crazy or is this not normal. Cause my 3.1 6000 does nothing of the such. Im about to start trading things untill i figure this out damnit. I took the vids upside down, oops, but you get the idea

http://smg.photobucket.com/albums/v210/Prospeeder/?action=view&current=08-03-08_1222.flv
http://smg.photobucket.com/albums/v210/Prospeeder/?action=view&current=08-03-08_1219.flv

grinders_18 · March 08, 2008, 02:10:12 PM

Dude that's normal! Your tach's just off. The RPM's don't "Shoot up", they just return to their normal idle spot when not in gear.

TGed · March 08, 2008, 02:38:48 PM

Seems normal. Try swapping EGR?

Prospeeder · March 09, 2008, 03:05:05 AM

hmmm ok well then i guess i wont worry about it. I thought it seemed odd

TGPvsTIII · March 09, 2008, 07:21:31 AM

Do the 3.1 throttle bodys have a screw to adjust base idle? If so could someone have changed it from factory setting and the computer needs to think for a minute because say the throttle blade is open too much? I haven't worked on many GM's but on my mopars I can with a scanner close the idle speed motor to check base idle or without a scanner force the idle up by creating a vacuum leak making the computer close the idle speed motor. When closed I can unplug the idle speed motor and stop the vacuum leak to check base idle. I don't know if this would work on a GM but be careful, on a dodge if you unplug the idle speed motor while it is working it can fry the driver in the computer for it. This is also part of our relearn process. If our base idle is incorrect the computer sets the idle speed motor to what it thinks it should be then after it finds the idle speed is not correct it will adjust it but it takes time to think about it. The dodge also will not learn the set value is wrong and will always use that number as a starting point. The opposite happens if the throttle blades gunk up with junk. The base idle is low and idle speed starts low and eventually will go up after it sees it wrong. Unfortunatly it stalls first many times. Just a thought hope it helps. The video did show a flair but not much. Ford programs what yours is doing into all its computers and call it extended idle. Takes a ford about a minute to drop and it does it everytime you start it. PTO equipted fords that use the factory computer to run the engine speed of the PTO will not let the PTO turn on until after the extended idle is timed out. Whats worse is if you try to turn on the PTO before it cycles it will never turn on during that ignition cycle and you have to restart the engine and try again.
Tim

Prospeeder · March 09, 2008, 11:43:54 AM

maybe, i dont think this is normal, when i come to stops the RPMs are up, it makes the car hard to stop especialy with the a/c on and the cars hot with the cooling fans. Why cant the stupid idle stay where it suppose to, always shooting up or hanging and then dropping not just imiedatly going, shouldnt it have it set where that perfect low idle is and go straight there, my 6000 does, why doesnt this?

grinders_18 · March 09, 2008, 12:01:01 PM

When I gave my 6000 STE to a friend, 2.8 liter V6, he replaced the MAF or MAP and the TPS and the idle went back to normal immediately. When I had it, it would go from like 500 RPM's to 2400 RPM's, back down, then back up, and after a few minutes it would steady itself out.

dogbone · March 09, 2008, 03:11:25 PM

Before I fixed my idle problem, I changed the EGR valve, idle control, MAP, CO2, changed a lot of vacuum lines, I bought 6 feet of vacuum hose and some brake lines and found some cracked plastic vacuum lines and replaced them, all helped a bit but the idle was still screwed up so I brought it into a GM dealer and they replaced the ECM and did an idle relearn with a scan tool and that did the trick, it runs perfect now and has more power.