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dak-quack
GenIII
 
10/08/2002
13:40:41
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 Subject: Rough Idle and Lurching
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Message:
Help me. I've put in 3923's, 180 t-stat, Gibson Cat back, Intense Z-tube and Fastman TB all within the past few weeks, in that order. Now my truck idles roughly, stalls, and when I am stopped it feels like some one taps me from behind. I comes and goes, some days worse than others. I've got the TPS at .75v. I didn't really notice it until the fastman, but it was all installed within a few days of eachother. The shifting seems a lot more sporadic too, but maybe I am just looking for more probs?
Any ideas, where do I start? New plugs? Could it be the IAT, PCM? I don't want to go to the dealer because I know they will blame the mods and make me pay for it. I guess I could take the Z-tube off and try that too.
The truck has about 7,000 miles on it. It doesn't bother me a whole lot but the other day it stalled after I slipped it into neutral to coast into my driveway and I just about took out my mailbox, (I guess my wife shouldn't drive it!)
2002 QC, 4.7 3.92 4x4 AT LSD
Line-X, Autolite 3923's, TPS adjusted to .75v, 180 stat
Intense Z-Tube Gibson cat-back, Fastman TB, Clear Corners
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CW
GenIII
10/08/2002
14:37:30
|  RE: Rough Idle and Lurching
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Message:
I have heard about some running issues with the 3923s and the 4.7. Nothing to what you are describing though. Make sure the top of the plug where the tip screws on is tight. Any codes?
4.7 HO, CW style
2001 4.7 5sp 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" Z-tube, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams, Robert shaw 180 therm, HO intake manifold.
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dak-quack
GenIII
10/08/2002
15:15:04
| RE: Rough Idle and Lurching
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Message:
Hey C-dub, thanks for the reply. I was hoping to hear from you.
I picked up some 5224's (or whatever the equiv. of OEM's is) and will put them in to see if that makes a difference.
I don't have any error lights. Is that what you mean? How do I check for codes?
Thanks!
2002 QC, 4.7 3.92 4x4 AT LSD
Line-X, Autolite 3923's, TPS adjusted to .75v, 180 stat
Intense Z-Tube Gibson cat-back, Fastman TB, Clear Corners
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joe
Dodge Dakota
JOIN HERE
10/09/2002
12:31:59
| RE: Rough Idle and Lurching
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Message:
could be a problem with the Idle air Control motor(On the back of the TB) as well. Do you hear a hissing sound when the idle gets rough(you will probably only hear it with aftermarket intake)? If so there is a TSB about the EGR solenoid for some of those trucks.
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dak-quack
GenIII
10/09/2002
12:51:10
| RE: Rough Idle and Lurching
IP: Logged
Message:
Does the IAC have an o-ring? Come to think of it, I don't think I have one on there now and maybe I lost it when swapping out the TB.
2002 QC, 4.7 3.92 4x4 AT LSD
Line-X, Autolite 3923's, TPS adjusted to .75v, 180 stat
Intense Z-Tube Gibson cat-back, Fastman TB, Clear Corners
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CW
GenIII
10/09/2002
14:46:52
| RE: Rough Idle and Lurching
IP: Logged
Message:
Yeah it is at the base of the IAC where it goes into the throttle body. Turn the key on three times fairly quickly and leave it on the third time. The code should come up in the odo window as a P number.
4.7 HO, CW style
2001 4.7 5sp 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" Z-tube, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams, Robert shaw 180 therm, HO intake manifold.
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dak-quack
GenIII
10/09/2002
15:30:22
| RE: Rough Idle and Lurching
IP: Logged
Message:
I get "P doNe"
2002 QC, 4.7 3.92 4x4 AT LSD
Line-X, Autolite 3923's, TPS adjusted to .75v, 180 stat
Intense Z-Tube Gibson cat-back, Fastman TB, Clear Corners
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Graphite
*GenIII*
10/09/2002
18:30:42
| RE: Rough Idle and Lurching
IP: Logged
Message:
That means you have no codes.
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Deep Purple
Gen III
10/10/2002
08:20:15
|  RE: Rough Idle and Lurching
IP: Logged
Message:
Had to give up the autolites, the idle just wasn't right, but once running they did good. Went with a MSD coil, it help but didn't solve the rough idle enough.
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Dominic
Dodge Dakota
JOIN HERE
10/10/2002
09:44:19
| RE: Rough Idle and Lurching
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Message:
I had similiar symptoms (rough idle, lurching and stalling) after I adjusted my TPS to 0.7 volts.
What happened was I tightened the screws holding the TPS too much causing the sensor to remain "open" after I revved the engine. What this means is that when the engine went back to idle the sensor sent an open throttle signal to the computer. The computer then fed more fuel into the engine which caused the engine to stall. I checked the TPS voltage after it stalled one time and the meter read ~ 3 VOLTS!!!!!! Yikes!!!!!
I just simply loosed the TPS screw a little and the problem went away.
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dak-quack
GenIII
10/10/2002
10:33:01
| RE: Rough Idle and Lurching
IP: Logged
Message:
Ok, thanks fellas. That gives me some things to check.
2002 QC, 4.7 3.92 4x4 AT LSD
Line-X, Autolite 3923's, TPS adjusted to .75v, 180 stat
Intense Z-Tube Gibson cat-back, Fastman TB, Clear Corners
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dak-quack
GenIII
10/28/2002
11:09:46
| RE: Rough Idle and Lurching
IP: Logged
Message:
Well I rechecked the TPS voltage and it was too at .85v. Lowered it a little and the problem seems to be fixed.
Thanks!
2002 QC, 4.7 3.92 4x4 AT LSD
Line-X, Autolite 3923's, TPS adjusted to .75v, 180 stat
Intense Z-Tube Gibson cat-back, Fastman TB, Clear Corners
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d_fl8ted1
Dodge Dakota
JOIN HERE
10/29/2002
21:17:32
|  RE: Rough Idle and Lurching
IP: Logged
Message:
might be a stupid question but what is tps stand for, really need to know
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slow2dak
Dodge Dakota
JOIN HERE
10/29/2002
21:31:40
|  RE: Rough Idle and Lurching
IP: Logged
Message:
Throttle Position Sensor
02 4.7 RC Sport
3.55 and a one-legged wonder
Homemade Y-pipe(removed precats)
full 3" single with 2 chamber Flowmaster
tps set at .701
removed rubber flap
adjustable ECT sensor
unplugged LPS
K and N drop in
relocated IAT
best 1/8: 9.69 @ 69.95
best 1/4: 15.401 @ 87.59
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Joe
Dodge Dakota
JOIN HERE
10/29/2002
21:32:20
| RE: Rough Idle and Lurching
IP: Logged
Message:
TPS stands for Throttle Position Sensor. It is a 3 wire wensor on the side of your throttle body that sends a voltage to the ecm about the position of the throttle. The signal varies from about .7v to 4 or 5 volts
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j
GenIII
10/29/2002
21:36:01
| RE: Rough Idle and Lurching
IP: Logged
Message:
Throttle Position Sensor
2000 4.7 CC auto, clear corners, Magnaflow catback, Kenne Bell s/c.
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j
GenIII
10/29/2002
21:38:20
| RE: Rough Idle and Lurching
IP: Logged
Message:
Sorry, didn't mean to be redundant. Didn't know someone posted ahead of me.
2000 4.7 CC auto, clear corners, Magnaflow catback, Kenne Bell s/c.
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