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ucimaplaya2

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Discussion starter · #1 ·
well i dont really think its a big problem, but ever since i installed my m1 a few months ago, i have had a little idle quirk going on.

whenever I drive somewhere and the truck is fully warmed up before i get there, I shut it off and go do whatever i have to do. And then when I come back to it to start it back up say, 10, 15 mins later, it idles funny when in gear. It jumps from 500-900 rpm back and fourth for the first 30 seconds or so. Its a little hard to describe but it kinda sounds like a vaccuum leak only it doesnt rev high. anyone else have this issue or a clue as to what this would be?
 
#2 ·
2 things to try.

Take the IAT out and clean it and the port in the TB really well ( Take TB off to do this of course... :) )

Undo the TPS, put it back on with the bolts not tight, turn the TPS all the way to the right as far as the bolt holes will let you, then tighten the TPS bolts snug. NOT TIGHT, as this can cause a binding issue ( esp on the aftermarket TB's )

Another thing to consider doing if you didnt when you did the M-1. Route the MAP vacuum pickup point to the side of the intake. This usually will increase throttle responce quite a bit as you get a better vacuum signal from there. Make sure to plug the TB vac port too.....

Danno
 
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#4 ·
Yessir! :twothumb:

Use brakeleen or throttlebody/carb cleaner to clean the IAT port out. DO NOT PULL ON THE PLUNGER ON THE IAT though.... just put it back in as is after carefully cleaning just the brass colored plunger area. Dont get cleaner on the body of the IAT.

Douche the crap outta the TB IAT hole though... youll see why when you get it apart ;)

Danno
 
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Discussion starter · #5 ·
haha yeah that plunger, i know all about that little bastard. the first time i cleaned it, i took it out looked at it and thought it was all just a high density black rubber, and then as i was gently cleaning it and thats when i found out it wasn't infact black, but actually brass.

that was a couple years ago though, so im sure its dirty again. thanks for the tips
 
#6 ·
I had the exact problem after my M-1 install. I tried everything Danno mentioned, and went and had my fuel sync set to -0-. The problem still exists though. As a last resort (because mine actually stalled a couple times at long red lights) I gave the throttle screw a few good turns and raised the rpm's up to about 800. The idle still jumps, but at least is doesn't stall anymore. I'm not saying this is a good thing or the right thing to do, but so far so good.
 
Discussion starter · #7 ·
well its not stalling, or making an issue really, and it only does it after it was fully warmed up then shut off and restarted soon after. its very minimal thing. but i will add the fuel sync reset to the list. i have been wanting to check that anyway. i guess i can do this when i travel back home and go back to the shop and see if they will let me use the scanner.
 
#8 ·
I had the same prob. I took out my IAC and cleaned it, and it did help, but problem came back not to long after. Once I replaced the IAC it's been good to go!!! :mullet: :mullet:
 
Discussion starter · #9 ·
well it is the original iac, so it wouldnt surprise me if this is the begining of its failure. its 7 years old with 85k miles on it and would be the first sensor to go out on this thing. Well ill clean it again and see what happens. thanks :)
 
#10 ·
PSSTRT said:
I had the same prob. I took out my IAC and cleaned it, and it did help, but problem came back not to long after. Once I replaced the IAC it's been good to go!!! :mullet: :mullet:
Click to expand...
I may try this again. I just replaced my IAC about 5-6K miles ago, but at this point I'll try just about anything.
 
Discussion starter · #11 ·
ok well i tried everything but resetting the fuel sync and replacing stuff. i still got the issue. i was just dealing with it and not caring before because it only did it after i shut it off and then started it back up while it was still warm and then put it in gear. But today it did it really bad, the motor just about stalled out before jumping up to 1000 and repeating the cycle. I think i might replace my IAC because of my other issues with my throttle "sticking." Hard to explain but its another issue with a different tb. http://www.dakota-durango.com/forum/showthread.php?t=29481 but this surging type thing started after the m1 install and does it with both the stock tb and the bored tb.
 
#12 ·
i had the exact same problem, i would clean the Idle Air Control motor/sensor out and it would run good for a couple of days, but eventually start idling rough again(almost stalling sometimes). I replaced the IAC with acdelco replacement and havent had that issue since(its been a year).
 
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Discussion starter · #13 ·
rezin8r said:
i had the exact same problem, i would clean the Idle Air Control motor/sensor out and it would run good for a couple of days, but eventually start idling rough again(almost stalling sometimes). I replaced the IAC with acdelco replacement and havent had that issue since(its been a year).
Click to expand...
i cleaned it and it didnt make a difference. but its only doing this after it has warmed up and then is shut off, and then restarted within a half hour or so when its still warm. And it only does it for a few minutes until i get driving and it comes back to normal. did yours do that too or did it just idle weird all the time?
 
#14 ·
Last fall mine was acting the same way, then it got worse and started eating O2 sensors like it was pez candy. Then I got backfires and it was running rough and stumbling and running real rich.

Turned out I had a vaccum leak on the M-1. Re-installed it and it runs great now. :eek:nethumb:
 
Discussion starter · #15 ·
00RedRT said:
Last fall mine was acting the same way, then it got worse and started eating O2 sensors like it was pez candy. Then I got backfires and it was running rough and stumbling and running real rich.

Turned out I had a vaccum leak on the M-1. Re-installed it and it runs great now. :eek:nethumb:
Click to expand...
ughhh not what i wanted to hear although it would make sense since it only does it after warm up and a slight cool down, i guess the metals would be cooling at different rates and could open up a gap or something. I thought I had done a pretty good job installing it and making sure everything was right. That was the second time i had to remove and install the manifold too. I dont want to do it a third but I guess I might have to. Ill test it to see if i can find a leak first though.
 
#16 ·
ucimaplaya2 said:
ughhh not what i wanted to hear although it would make sense since it only does it after warm up and a slight cool down, i guess the metals would be cooling at different rates and could open up a gap or something. I thought I had done a pretty good job installing it and making sure everything was right. That was the second time i had to remove and install the manifold too. I dont want to do it a third but I guess I might have to. Ill test it to see if i can find a leak first though.
Click to expand...
Yeah, mine was doing it after being warmed up as well. :sorry:

Did you load up the corners with RTV before setting the M-1 down on the gaskets? Also, don't forget to re-torque the M-1 after a couple hundred miles are put on it.
 
Discussion starter · #17 ·
yeah i used rtv on the corners. and i didnt retorque it yet. should have but didnt. I will later. but i do have a small glimmer of hope in my mind. when i orignially installed it, i made my own fuel rail spacers. 5 out of 6 we made the perfect heights, but one of the fuel rail spacers my friend made a little too long. its supposed to be 1.850 inches and it came out being around 1.950 IIRC. It looks fine but maybe the new injector o-rings arent sealing right on those two injectors. I think I will pull that fuel rail, grind that spacer down some on the bench grinder, check the o-rings and see if that helps. I doubt it will, but you never know and its easy to do, pulling the manifold isnt.

do you know where your leak was? I assume it was on the intake gaskets against the heads?
 
#20 ·
dakrt2000 said:
Wouldnt there be a noticable oil leak??? Coming from the back of the motor?
Click to expand...
I would think so. Now I'm a bit nervous too. My idle's still a little rough, and yesterday I romped on it, then had to let off real quick, and got a nasty backfire. I'm hoping the flash will help with the throttle response/hesitation.
 
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Blue93Dakota
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