| From | Message |
MikeD
Dodge Dakota
JOIN HERE
1/31/2002
13:17:34
|
 Subject: Chaning Idle speed
IP: Logged
Message:
I'm not installing the MSD on my truck cuz I've heard more than enough info about them shutting down than I need to hear. So is there any way to increase my idle speed like when I'm sitting at a stop light right when I've started my truck up and its idling at about 800-900 rpm's. When its warm it only idles at about 400-500rpms. It sounds tough when it idles higher just wondering if therez any way I can do that.
|
alex
Dodge Dakota
JOIN HERE
1/31/2002
13:25:46
|  RE: Chaning Idle speed
IP: Logged
Message:
Rest your foot on the gas pedal.
|
MikeD
Dodge Dakota
JOIN HERE
1/31/2002
13:36:05
| RE: Chaning Idle speed
IP: Logged
Message:
HAHAHA yeah I've done that actually...gets old though looking for another way.
|
toast
Dodge Dakota
JOIN HERE
1/31/2002
17:18:43
| RE: Chaning Idle speed
IP: Logged
Message:
Well if it is a 3.9,5.2 or 5.9 yes there is a way. I did it to my R/T, on the left side of the TB where your throttle linkage is you will see the throttle control arm and when it goes to idle it rest on a screw. Now the screw hole is coved by a little tin plate that can be drilled out to get to the screw. It is a torques head 25 and just turn it clockwise untill you have the idle where you want it. I got mine set at around 750 in park and it drops down to about 700 when it goes into rev or drive. Mkae sure the engine is fully warmed up before doing this.
|
Anthony G
Dodge Dakota
JOIN HERE
1/31/2002
17:38:10
| RE: Chaning Idle speed
IP: Logged
Message:
Make sure you change this back if you have emission testing. Higher RPMS cause more Pollution when doing the idle test. Also it uses more gas to keep you RPM higher.
Might be more cost effective to buy yourself a performance muffler rather than spending your money on gas.
I don't need inspections where I live now. :)
|
R Middleton
Dodge Dakota
JOIN HERE
1/31/2002
17:46:54
|  RE: Chaning Idle speed
IP: Logged
Message:
Great Tip
I've been trying to think of ways to bring my Idle up when I go to the track. I find I launch best at around 1100 rpm. I've wanted a non-permanent way of setting the idle high so I don't get distracted trying to hold the revs while waiting for the Green.
I'll give this a try after the local track thaws out!
Thanks board.
Middy.
|
MikeD
Dodge Dakota
JOIN HERE
1/31/2002
18:02:11
| RE: Chaning Idle speed
IP: Logged
Message:
Thanks I'll try that...I have a high performance muffler but it just sounds meaner when it idles higher at a stop light.
|
Simpleman96
Dodge Dakota
JOIN HERE
2/01/2002
15:21:07
| RE: Chaning Idle speed
IP: Logged
Message:
I tried changing my idle speed this way and the engine will start reving up and down on its own and wont stop until I bring it back down. 96 3.9. Anyone have this problem.
|
MikeD
Dodge Dakota
JOIN HERE
2/01/2002
19:35:06
| RE: Chaning Idle speed
IP: Logged
Message:
I just talked to Bernd about this and after changing the idle speed by turning that torx screw the PCM which is programmed for a certain idle speed will sense its not at the right idling level and when you turn off the truck and start it up the engine will adjust back to the stock idle speed. So I guess this mod doesn't work. Guess I'll have to wait awhile to get my PCM reflashed.
|
R Middleton
Dodge Dakota
JOIN HERE
2/01/2002
20:01:43
| RE: Chaning Idle speed
IP: Logged
Message:
Damn.
Middy.
|
jjj
Dodge Dakota
JOIN HERE
2/03/2002
01:56:48
| RE: Chaning Idle speed
IP: Logged
Message:
You can change the idle speed by turning the torx.
The trick is to
a. reset the pcm after
b. set it with the idle speed motor completely closed. The easiest way to close the motor is to pull the hose off of the pcv valve - the engine will race but try to slow down, when it gets as slow as it can disconnect the idle speed motor and reconnect the pcv valve hose. Crude but works.
c. don't go to high with it and keep your tps under 0.9 v.
You used to be able to do it using the minimum air flow setup, but I'm not sure if the drbIII now closes the idle speed motor. CW may know.
Also I have to question the logic of raising the tps setting higher than 0.55v. Used to be (the newer software may not use the same logic) all the pcm looked at was the minimum tps voltage setting and then the used the tps voltage to calculate % throttle opening. Minimum air flow setting was always more important than minimum tps voltage. However I did try upping the tps voltage and there was an intial perf gain ( I believe from resetting the PCM and not the tps) but within a few miles the pcm relearned and the gain disappeared. Just my experience.
Jeff
|
CW
GenIII
2/03/2002
10:28:21
| RE: Chaning Idle speed
IP: Logged
Message:
That is setting the minimum air flow with a special orfice in the pcv line. Minimum air flow has nothing to do with actual idle speed just the amount of air that the computer expects to go by the throttle body. The IAC takes over after that.
If you arbitrarily play with the torx you could end up with stalling or to high of idle problems. These engines were designed to idle at 600 rpm.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat. Electric fan Convertion, Awaiting HO cams.
Working on adjustable fuel pressure with return.
|
jjj
Dodge Dakota
JOIN HERE
2/03/2002
11:09:12
| RE: Chaning Idle speed
IP: Logged
Message:
Correct CW, however if you make the IAC close completely and set your idle at say 800rpms it will never idle slower than that. The trick is to get it at the spot where it the idle isn't excessive either direction. I used to set up cars to idle at 5-10 steps using the DRBIII, of course after cleaning the TB.
Jeff
|
CW
GenIII
2/03/2002
11:51:26
| RE: Chaning Idle speed
IP: Logged
Message:
Yes but like I say if you start screwing around with the minimum air flow the computer doesn't know what is happening. That can cause all kinds of wierd things like idleing to high, low and or stalling. My advice leave it where it is at.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat. Electric fan Convertion, Awaiting HO cams.
Working on adjustable fuel pressure with return.
|
gloomygoblin
Dodge Dakota
JOIN HERE
1/20/2005
20:57:20
|  RE: Chaning Idle speed
IP: Logged
Message:
Ok.. heres a hard one for ya.. Yesterday I changed the waterpump on my 98 Dakota with the 3.9 V6 I parked it in the garage and it was idleing at 675 rpm. I did the waterpump change and fired it up... The idle was at 1500 RPM! 1200 In Park.. it was also missing at times and has a lopy run at idle.. at speed everything is fine??? I didnt touch the distributor, wires, plugs.. they are all new anyhow.. I made sure everything is plugged in.., I looked for any vacume leaks and hear/saw none... I cleaned the IAC and nothing???? no differance at all.. I recet the PCM using the PCV valve trick without any change.. Im compleatly lost over whats goin on here.. I even changed the battery cables 2 make sure optimum voltage was acheved... also.. there is no check engine light on... Any Ideas would be appreatated.. One more thing.. the truck is parked outside in often -30 and cooler temps.. when I worked on it the garage was 75 degrees or so.. I also had unplugged the PCM before I started...have no water in the oil and never overheated it >>> what could it be???
|
Crow318
Dodge Dakota
JOIN HERE
1/21/2005
11:44:47
| RE: Chaning Idle speed
IP: Logged
Message:
have you looked at the throttle cable or linkage?
does the throttle pedal work smooth?
You may have gotten a piece of dirt or something in the cable or on the linkage keeping it from returning all the was to idle.
|
| | P 1 |
|
Post a reply to this message:
Username Registration: Optional
All visitors are allowed to post messages
|
