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tchandler
Dodge Dakota
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3/18/2004
22:42:51

Subject: fixed idle and surging problems!
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Hey, if anyone has some crazy idle problems, and maybe has the surging (lockup-clutch disengaging and engaging) while crusing it fixed my 2000 4.7 Auto by replacing the Throttle Position Sensor. It was a $25 part and took 37.82 :) seconds to replace.



Rob C
Dodge Dakota
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3/19/2004
02:04:13

RE: fixed idle and surging problems!
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Just out of curiosity, were you able to meter the output of the TPS and see what it was doing?



tchandler
Dodge Dakota
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3/19/2004
10:27:06

RE: fixed idle and surging problems!
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No, i already had the part so i just put it in. The surging for me was happening when i would go over a bump, my foot would move the throttle a bit, but I think that the TPS would then spike sending an erratic voltage to the TCM. The TCM probably thought it was at WOT, a potition where the lockup clutch was supposed to disengage and therefore disengaged it only moments later getting the real voltage and reengaging the clutch. I wasn't sure what the range of voltages was supposed to be but looking for the spike would show problem.



max
Dodge Dakota
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3/19/2004
19:33:24

RE: fixed idle and surging problems!
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I have this surging when I'm in cruise control mode, or just cruising along would your solution solve my problem.



Dakota52318
Dodge Dakota
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3/19/2004
20:56:27

RE: fixed idle and surging problems!
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I know that whenever I let fully off the gas in my truck, the TC lets go, and when I am back on the gas, just a sec after, it locks back up... makes for about a 200RPM surge, well, srop actually.... is that maybe what was happening for you? Thats just the way the pcm is prgrammed.



TexasTodd
Dodge Dakota
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3/19/2004
22:27:54

RE: fixed idle and surging problems!
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tc,

The dealer and DC has developed a 'death flash', that retarded the timing some, and smoothed out the idle some, robbed power, etc.

Now, if it could be fixed like you did, there are going to be some upset dak owners!

My 4.7, 2001, 5spd, etc, always idles real smooth, even after the HO cams, self ported 68mm TB, no clutch/fan, etc.



Rob C
Dodge Dakota
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3/19/2004
22:56:35

RE: fixed idle and surging problems!
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Hey TexasTodd, This is off the subject but, are you running only the stock electric auxiliary cooling fan? Does it work pretty well that way? Do you live where it gets real hot in the summer. The reason I'm asking was that I went to the dealer and looked under the hood of a 2004 Grand Cherokee with the HO 4.7L V8. One of the things Jeep did to get more power was delete the engine driven fan and install a giant electric fan. I was thinking of doing that to my vehicle but the fan costs like $600 list, if I go to the junk yard, how many vehicles are totaled with no front end destruction plus it appeared to me that the electrical connector was different.
If I can run the engine with out that mechanical fan, it might be worth some hp plus, I wouldn't have to listen to that awful noise on cold start up. Let me know about the fan. Thanks!



tchandler
Dodge Dakota
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3/19/2004
23:41:48

RE: fixed idle and surging problems!
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First let me say one thing. You can test the TPS by hooking up a meter. You can try this to: with the engine idling tap on the TPS with your finger. If the engine races, it might be bad. Now let me tell about the idle: It was not a rought idle that was my problem, it was a jumping idle, but my main problem was the surging. ALso, when you let off the throttle, the clutch is supposed to disengage, therefore when you push the throttle again it will lock back up (assuming you are at the right speed.) Mine was surging while keeping constant pressure on the throttle which resulted ina bad TPS.



Wal
Dodge Dakota
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3/25/2004
19:11:14

RE: fixed idle and surging problems!
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YOu can't always tell that way. My TPS checked a-ok in my 99, but I was getting a lock/unlock on cruise control that was driving me NUTS. I replaced it anyway, ($25 from Autozone for a Sorenson), and my troubles are over. I didn't bother checking or adjusting the voltage on the new one.

My problem now is a screwed up idle I recently caused by trying to index the distributor based on the SpeedTweaks instructions :-( I have to buy a scantool now and set it right I guess.

Wal




mico
Dodge Dakota
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8/12/2010
01:25:13

RE: fixed idle and surging problems!
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I have a 2000 Jeep grand cherokee and it seems to always roar to 2000 rpm at startup, then sometimes the idle comes down to normal. But most of the time it will surge, untill i kick it down. It seems to do it more in the summer rather than the winter, but i think it may be coincidence. I replaced the iac motor and no such luck and cleaned the throttle body. It used to only roar and surge at startup, but now it seems to be doing it at any time, warm or cold. Any sugestions would be greatly appreciated. Thank you!



agfox
Dodge Dakota
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9/20/2013
18:28:03

RE: fixed idle and surging problems!
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I have a 2001 dakota w/4.7 I ended cleaning the throttle body and the AIT using a tooth brush along with the carb cleaner. That is what solved my 2000 rpm start up and surges. About a 15-20 min. job. By the way I'm NOT a mech. Good luck with you're vehicle.



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