Miss/Stumble @ Idle
#1
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Got a '96 5.9L that has developed a slight miss/stumble @ idle.
Here are the particulars...
1. Happens in any gear (including park and neutral)
2. Only happens @ idle. Once throttle is pressed it goes away
3. Tach will move ever so slightly
4. It is not consistent. Does not have a smooth miss and comes and goes at will (hot or cold doesn't matter). It may go days without doing it.
5. No CEL
6. It is a very slight stumble/miss
7. Did notice a slight film of clear oil in the inside of my intake
New Parts to rule out...
1. Distributor cap and rotor
2. Spark Plugs
3. Front O2 sensor
4. Cleaned IAC valve and throttle body (thoroughly)
I searched around and found a few possible causes (iac valve, TPS, CPS, plenum), but nothing definitive.
Anybody have the same issues?
Here are the particulars...
1. Happens in any gear (including park and neutral)
2. Only happens @ idle. Once throttle is pressed it goes away
3. Tach will move ever so slightly
4. It is not consistent. Does not have a smooth miss and comes and goes at will (hot or cold doesn't matter). It may go days without doing it.
5. No CEL
6. It is a very slight stumble/miss
7. Did notice a slight film of clear oil in the inside of my intake
New Parts to rule out...
1. Distributor cap and rotor
2. Spark Plugs
3. Front O2 sensor
4. Cleaned IAC valve and throttle body (thoroughly)
I searched around and found a few possible causes (iac valve, TPS, CPS, plenum), but nothing definitive.
Anybody have the same issues?
#2
Join Date: Apr 2008
Location: Lee County, North Carolina
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have you tried running a can of seafoam through the gas tank? mine and my dads and my sisters trucks all have a "slight miss" but i don't think its anything to worry about. do you mean that the tach isn't frozen in one spot while running? what i mean about ours is that if you watch the tach you can see it move maybe 5 rpms while its at idle.
#3
#5
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Not to hijack, but my tach will twitch every now and then at idle. And i dont feel a misfire or anything when it does this. It'l twitch up or down. It twitches Quick too.. IAC? Or what? Even when it does this i dont feel a bump in the idle. Is it doing somthing and im just not feeling it? Its weird. I dont hear anything when i listen to the exhaust either. I need to ad that i replaced the TPS with a BWD TPS from advance. No change at all. I will clean the IAC to see if that helps. If not. Ill replace it. What i really want to do is replace all the engine control sensors. Like IAC, MAP, and the o2 sensors. And also want to replace the cat before that gives me probs. lol, but money wont allow that..
Last edited by DODGEPWR; 07-22-2009 at 01:39 PM.
#6
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Not to hijack, but my tach will twitch every now and then at idle. And i dont feel a misfire or anything when it does this. It'l twitch up or down. It twitches Quick too.. IAC? Or what? Even when it does this i dont feel a bump in the idle. Is it doing somthing and im just not feeling it? Its weird. I dont hear anything when i listen to the exhaust either. I need to ad that i replaced the TPS with a BWD TPS from advance. No change at all. I will clean the IAC to see if that helps. If not. Ill replace it. What i really want to do is replace all the engine control sensors. Like IAC, MAP, and the o2 sensors. And also want to replace the cat before that gives me probs. lol, but money wont allow that..
#7
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#8
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I don't have a scanner to check the dist +/-, but I have noticed a few additional points to consider.
1. I relocated the ignition/coil wires per the TSB
2. I have concluded that the engine will not miss/stumble when cold, only after it has warmed up to operating temp.
Does this help jog anybody's mine
1. I relocated the ignition/coil wires per the TSB
2. I have concluded that the engine will not miss/stumble when cold, only after it has warmed up to operating temp.
Does this help jog anybody's mine
#9
#10
![Default](https://dodgeforum.com/forum/images/icons/icon1.gif)
Got a '96 5.9L that has developed a slight miss/stumble @ idle.
Here are the particulars...
1. Happens in any gear (including park and neutral)
2. Only happens @ idle. Once throttle is pressed it goes away
3. Tach will move ever so slightly
4. It is not consistent. Does not have a smooth miss and comes and goes at will (hot or cold doesn't matter). It may go days without doing it.
5. No CEL
6. It is a very slight stumble/miss
7. Did notice a slight film of clear oil in the inside of my intake
New Parts to rule out...
1. Distributor cap and rotor
2. Spark Plugs
3. Front O2 sensor
4. Cleaned IAC valve and throttle body (thoroughly)
I searched around and found a few possible causes (iac valve, TPS, CPS, plenum), but nothing definitive.
Anybody have the same issues?
Here are the particulars...
1. Happens in any gear (including park and neutral)
2. Only happens @ idle. Once throttle is pressed it goes away
3. Tach will move ever so slightly
4. It is not consistent. Does not have a smooth miss and comes and goes at will (hot or cold doesn't matter). It may go days without doing it.
5. No CEL
6. It is a very slight stumble/miss
7. Did notice a slight film of clear oil in the inside of my intake
New Parts to rule out...
1. Distributor cap and rotor
2. Spark Plugs
3. Front O2 sensor
4. Cleaned IAC valve and throttle body (thoroughly)
I searched around and found a few possible causes (iac valve, TPS, CPS, plenum), but nothing definitive.
Anybody have the same issues?