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lost
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6/02/2005
19:52:46

Subject: Low Idle, bad sensor? which one is it?
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I adjusted the idle and it drops too slow and falls back down to 400. so it is not a setting with the adjuster.

what else would cause a low idle? Im thinking a certain sensor, but which one would do it?




?
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6/03/2005
09:08:02

RE: Low Idle, bad sensor? which one is it?
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What year is truck ???
Possible need to clean
Intake Air Control " IAC "
at back of throttle body ..
Possible TPS - Throttle Position Sensor
????



lost
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6/03/2005
13:26:42

RE: Low Idle, bad sensor? which one is it?
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1995 3.9

That is the place i checked was the iac. nothing happens, *no change in sound, or anything like that when i unplug it.

should something happen?

it stalls when i unplug the extention of the egr valve. the backpressure part.



93dak4x4
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6/03/2005
19:26:52

RE: Low Idle, bad sensor? which one is it?
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i see nothing wrong with an idle of 400 rpm. my truck has idled between 300-500..(changes by the day?) for as long as i have owned it. and i have changed every sensor if you read the "happy with gas mileage post(or lack of)" you will see that.



Doug
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6/04/2005
23:11:21

RE: Low Idle, bad sensor? which one is it?
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Unplugging the IAC is not suppose to do anything if you are already idling. The sensors' solenoid valve just "resets" to it's minumum position, which of course at idle speed with no load on the engine is...idle speed (300-800 RPM). What did you do when you adjusted the idle? You might want to clean the IAC, just becareful that you don't damage the solenoid plunger. (Use isoprophyl alcohol or starter fluid)



lost
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6/05/2005
08:01:55

RE: Low Idle, bad sensor? which one is it?
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I broke the cap off the screw that changes the idle speed. it's there for obvious reasons, but in the way to me.

the engine shakes too much. compared to my other truck, same engine. it idles 800 and doesnt shake like that.
it's like a bad spark plug, but they are good and new. why would it shake so much??



Bob Lincoln
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6/05/2005
11:25:10

RE: Low Idle, bad sensor? which one is it?
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Because it's about to stall. Mine runs at 600 in drive. 400 seems to low to sustain a decent idle.

Why did you mess with it? Can you put it back where it was?



93dak4x4
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6/05/2005
12:39:09

RE: Low Idle, bad sensor? which one is it?
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your truck shouldnt be about to die at 400 rpm unless you have a problem. in drive mine idles at 400 most days. it shakes a little bit but that is because dodge didnt balence these motors extremely well. your idle is pretty much comp controlled so you cant do much. but try a general tune up if its running rough. sometimes a new set of spark plugs can do wonders.



Dean
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6/05/2005
12:52:17

RE: Low Idle, bad sensor? which one is it?
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This problem on my truck was cured by a new oxygen sensor.



93dak4x4
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6/05/2005
14:00:58

RE: Low Idle, bad sensor? which one is it?
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i have changed my oxygen sensor three times now in two years...it never changed my idle but i cant figure out why my truck eats those S O B's



Dean
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6/05/2005
23:26:23

RE: Low Idle, bad sensor? which one is it?
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You sure you're not running rich or burning oil? Sure you don't have leaky/worn out valves? And, not to put to fine a point on it, are you sure the tach is accurate? Check it with a tune-up tach and see if it's the same.



N56629
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6/06/2005
06:50:03

RE: Low Idle, bad sensor? which one is it?
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"I broke the cap off the screw that changes the idle speed."

That's why they put the cap on in the first place. It is not an idle screw. The IAC adjusts your idle, not the screw.



Dan M
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6/06/2005
07:18:14

RE: Low Idle, bad sensor? which one is it?
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I replaced the pcv and breathers and the associated hoses and grommets and that helped my truck idle MUCH smoother. Also it got a little better (more consistant idle) when i replaced my stock airbox with a 10" open element with k&N filter.

for a more detailed post, search for resolved rough idle problem, I think that was the subject of the post I started.

I have a 95 CC 4x4 with 3.9L auto. It idles around 600 rpm.

- Dan M



John K
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6/06/2005
07:56:37

RE: Low Idle, bad sensor? which one is it?
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Cleaning my TPS connector did the trick for me. That solved my rough idle, stalling and converter lockup problems. Also, make sure you remove the TPS from the throttle body and reinstall it. I think that relieves some built up stress or warp in the TPS housing, which may give it some internal difficulties.



N56629
Dodge Dakota
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6/06/2005
10:44:13

RE: Low Idle, bad sensor? which one is it?
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"Also, make sure you remove the TPS from the throttle body and reinstall it. I think that relieves some built up stress or warp in the TPS housing, which may give it some internal difficulties."

You're kidding, right?



John K
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6/06/2005
11:12:11

RE: Low Idle, bad sensor? which one is it?
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Read my last post on this thread for details:

http://www.dodgedakota.net/boards/gen/6378-1.html

I had given up hope and was about to go on another spending spree to solve these issues. I've been driving for well over 100 miles now with 2 or 3 problems *gone*

I had unplugged the TPS a couple of times before, but nothing changed until I actually removed it and put it back in to the throttle body.

I'm no expert for sure, and I hope I don't appear to be, but I'm happy to share my solutions, experience, opinions and theorys if someone can make use of them.

It worked for me ...your mileage may vary.

Cheers, John



N56629
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6/06/2005
12:10:58

RE: Low Idle, bad sensor? which one is it?
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Sorry if I seem to be doubtful, John. I've seen the TPS installed incorrectly and causing problems. If the TPS is binding in some way the throttle shaft would also bind because it is linked and one can't move without the other. I won't say it can't happen but it just seems highly unlikely.

The bad connection, that you cited in the other thread, sounds far more likely.





John K
Dodge Dakota
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6/06/2005
12:54:54

RE: Low Idle, bad sensor? which one is it?
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N56629; No need to apologise! Scepticism is your best friend!

If you look closely at the TPS, It is only moved by the throttle shaft in the 'throttle opening' motion (if that makes sense.) The 'return to idle' motion seems to be by internal spring action, independant of the throttle shaft. If there is any hangup on that return motion, say dirt or a broken spring, or warped housing, you now have an inaccurate throttle position reading.

I have precidence for this theory: my 87 TurboCoupe had 'electronic' dual rate shocks. These began malfunctioning so I took it to the dealer and they charged me $400 to install two new rotary actuators on top of the rear shock towers. Worked for about 2 days until the same problem appeared. I discovered that the actuator mount was slightly warped (forged steel bracket) and bent the actuator enough to jam the rotary mechanism. Solution: I left the mounting bolts loose.

The TPS mounting screws on my truck where torqued pretty tight, needed a ratchet to loosen them.

Anyway, my solution may be accidental, and my theory may have come out of my a$$, but it's cheap, and if it works for someone else, then it makes that $400 lesson with my TurboCoupe more bareable.

;^)



Lost
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6/06/2005
17:23:38

RE: Low Idle, bad sensor? which one is it?
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Spark plugs and plugs, do OFTEN. brand new by the way.

pcv valves are perfect, click when shooken, and have good suction. swapped between the two trucks with those for fun.

you might be right on the pcv hose, i didn't know they were replacement parts. are they? or do you have to go to a dealer for that, because it is not a normal hose.

the screw got my idle to go up. the Chilton book even says too, though very limited on words. :)

but i couldn't keep it up.


-------------
don't know where the TPS is at this point, that is my next option, i will look at the book, and come back on here tomorrow to see if anyone can tell me where it is located.


Left, Middle, then Right/backright of TB (IAC)

dunno what the left and middle connectors are.
are one of those two the TPS?



Doug
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6/06/2005
18:30:06

RE: Low Idle, bad sensor? which one is it?
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The TPS is located on the drivers side(right as looking at motor from front)of the TB(opposite side of the throttle cable and linkages) Check the voltage on the middle pin to ground. Should be between 0.05VDC and 0.1VDC(optimal between 0.07-0.075VDC) with the throttle closed(make sure you turn the key to the on position)If you have a simpson(analog) meter, you might want to check the resistance as you rotated it(the butterfly valve) back and forth(closed to open throttle slowly). You are looking for a smooth rise and fall in resistance. If it jumps or has an abrupt rise or fall in ohms, it is bad and will need to be replaced. Sorry if i lost you, but it should tell you about the same thing in the Hanes or Chilton manual.



lost
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6/08/2005
18:55:41

RE: Low Idle, bad sensor? which one is it?
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as of right now, i am analog and digital meterless. i have access to one but it will take a bit to get that done.

i believe i know exact location of the tps



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