Knocking/Ticking Noise in 4.0L
#1
Thread Starter
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Joined: Dec 2019
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From: OH
Year: 1993
Model: Cherokee (XJ)
Engine: 4.0L
Knocking/Ticking Noise in 4.0L
I am nowhere near an expert, especially with engines. It drives fine with the noise, but I am just wondering if anyone knows what the sound is here so I can fix it. Any help would be appreciated!
#2
its too hard to tell from those vids
you need to place mechanics stethoscope on the head, to see if you can identify what cylinder it is coming from (sounds like top end)
is there any indication of loss of performance ?
(one way to check is pull each spark plug wire while the engine is running..the drop in RPM should be the same each time...if you pull one and the motor doesnt change much, that means that cylinder is not functioning as it should)...be careful not to get a jolt from the plug wire
you need to place mechanics stethoscope on the head, to see if you can identify what cylinder it is coming from (sounds like top end)
is there any indication of loss of performance ?
(one way to check is pull each spark plug wire while the engine is running..the drop in RPM should be the same each time...if you pull one and the motor doesnt change much, that means that cylinder is not functioning as it should)...be careful not to get a jolt from the plug wire
#3
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From: United Kingdom
Year: 1995 RHD
Model: Cherokee (XJ)
Engine: 4.0l
#4
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Joined: Feb 2019
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From: NC
Year: 2004
Model: Grand Cherokee (WJ)
Engine: 4.0
Getting shocked like this may also be able to result in death to occur if the electricity makes it to hit the hearts electrical axis on the wrong waveform, to cause a phenomenon know as Torsade de pointes, which is characterized by a gradual change in the amplitude and twisting of the QRS complexes around the isoelectric line.
Using insulated gloves and a pair of electricians pliers will all but eliminate most of the worry.
#5
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From: Connecticut
Year: 2000
Model: Cherokee (XJ)
Engine: 4.0
Getting shocked like this may also be able to result in death to occur if the electricity makes it to hit the hearts electrical axis on the wrong waveform, to cause a phenomenon know as Torsade de pointes, which is characterized by a gradual change in the amplitude and twisting of the QRS complexes around the isoelectric line.
#6
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Joined: Feb 2019
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From: NC
Year: 2004
Model: Grand Cherokee (WJ)
Engine: 4.0
What do you mean NO?
I have a response. But, it is a little off topic.. It does also still apply specifically to the topic of this thread in ways too though.
Do you want to hear?
I have a response. But, it is a little off topic.. It does also still apply specifically to the topic of this thread in ways too though.
Do you want to hear?
#9
93cherokee I agree a mechanics stethoscope will help you greatly & its cheap. Any chance you can video the hood open again while revving the throttle plate a bit?
#10
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From: Groton, MA
Year: 1995
Model: Cherokee(XJ)
Engine: I6 4.0L
#11
Banned
Joined: Feb 2019
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From: NC
Year: 2004
Model: Grand Cherokee (WJ)
Engine: 4.0
I sincerely hope I do not get into any kind of trouble by the site administration for straying too far off topic? I apologize ahead of time if this is what I am doing.
The only way it relates to the main topic is by way of the side topic started regarding the dangers associated with recieving an accidental electric shock. Which is a real danger. So, it does apply in this way.
For my follow-up; As a fully trained Emergency Nurse critical care healthcare provider. What are the reasons for using synchronization during cardioversion? Are there certain heart rhythms in which it is advised not to shock? For instance, what would happen if you were to deliver an unsynchronised shock to a patient with a history of congenital long-QT syndrome type 1 (LQTS1)? Is it true a person with this particular syndrome may enter into a lethal rythm should an unsynchronised shock be delivered during the vulnerable period from the middle and second half of the T wave? What rythm would be most likely to occur?
Long-QT syndrome type 1 (LQTS1) predisposes people to malignant polymorphic ventricular arrhythmias (in particular, torsades de pointes) which can lead to syncope, cardiac arrest or sudden cardiac death.
An electric shock occurring on the heart outside of the refractory QRS period has the possibility to send a person into Ventricular Fibrillation (a fatal rhythm) even without any underlying dysthymia. In the case of a person with Long-QT syndrome being hit by an electric shock during the vulnerable period.. the rythm they are likely to enter into is torsades. Which as we know it this rythm has a very high probablity to quickly lead right directly into Ventricular Fibrillation without immediate prompt intervention.
It is okay to look at the spark plugs in the wrong way though.. I don't agree with that statement any at all
The only way it relates to the main topic is by way of the side topic started regarding the dangers associated with recieving an accidental electric shock. Which is a real danger. So, it does apply in this way.
For my follow-up; As a fully trained Emergency Nurse critical care healthcare provider. What are the reasons for using synchronization during cardioversion? Are there certain heart rhythms in which it is advised not to shock? For instance, what would happen if you were to deliver an unsynchronised shock to a patient with a history of congenital long-QT syndrome type 1 (LQTS1)? Is it true a person with this particular syndrome may enter into a lethal rythm should an unsynchronised shock be delivered during the vulnerable period from the middle and second half of the T wave? What rythm would be most likely to occur?
Long-QT syndrome type 1 (LQTS1) predisposes people to malignant polymorphic ventricular arrhythmias (in particular, torsades de pointes) which can lead to syncope, cardiac arrest or sudden cardiac death.
An electric shock occurring on the heart outside of the refractory QRS period has the possibility to send a person into Ventricular Fibrillation (a fatal rhythm) even without any underlying dysthymia. In the case of a person with Long-QT syndrome being hit by an electric shock during the vulnerable period.. the rythm they are likely to enter into is torsades. Which as we know it this rythm has a very high probablity to quickly lead right directly into Ventricular Fibrillation without immediate prompt intervention.
It is okay to look at the spark plugs in the wrong way though.. I don't agree with that statement any at all
Last edited by Noah911; 12-24-2019 at 07:43 AM.
#12
CF Veteran
Joined: Jan 2017
Posts: 3,313
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From: Connecticut
Year: 2000
Model: Cherokee (XJ)
Engine: 4.0
As an aside, it's not voltage that's the problem, it's amperage x time. The danger zone is about 100-200 milliamps. The cardiac arrythmia is pretty much ventricular fibrillation. Had one incident where a father-son were working with a aluminum ladder and touched the incoming power line. Horrible.
#13
CF Veteran
Joined: Nov 2017
Posts: 3,700
Likes: 236
From: Groton, MA
Year: 1995
Model: Cherokee(XJ)
Engine: I6 4.0L
I sincerely hope I do not get into any kind of trouble by the site administration for straying too far off topic? I apologize ahead of time if this is what I am doing.
The only way it relates to the main topic is by way of the side topic started regarding the dangers associated with recieving an accidental electric shock. Which is a real danger. So, it does apply in this way.
For my follow-up; As a fully trained Emergency Nurse critical care healthcare provider. What are the reasons for using synchronization during cardioversion? Are there certain heart rhythms in which it is advised not to shock? For instance, what would happen if you were to deliver an unsynchronised shock to a patient with a history of congenital long-QT syndrome type 1 (LQTS1)? Is it true a person with this particular syndrome may enter into a lethal rythm should an unsynchronised shock be delivered during the vulnerable period from the middle and second half of the T wave? What rythm would be most likely to occur?
Long-QT syndrome type 1 (LQTS1) predisposes people to malignant polymorphic ventricular arrhythmias (in particular, torsades de pointes) which can lead to syncope, cardiac arrest or sudden cardiac death.
An electric shock occurring on the heart outside of the refractory QRS period has the possibility to send a person into Ventricular Fibrillation (a fatal rhythm) even without any underlying dysthymia. In the case of a person with Long-QT syndrome being hit by an electric shock during the vulnerable period.. the rythm they are likely to enter into is torsades. Which as we know it this rythm has a very high probablity to quickly lead right directly into Ventricular Fibrillation without immediate prompt intervention.
It is okay to look at the spark plugs in the wrong way though.. I don't agree with that statement any at all
The only way it relates to the main topic is by way of the side topic started regarding the dangers associated with recieving an accidental electric shock. Which is a real danger. So, it does apply in this way.
For my follow-up; As a fully trained Emergency Nurse critical care healthcare provider. What are the reasons for using synchronization during cardioversion? Are there certain heart rhythms in which it is advised not to shock? For instance, what would happen if you were to deliver an unsynchronised shock to a patient with a history of congenital long-QT syndrome type 1 (LQTS1)? Is it true a person with this particular syndrome may enter into a lethal rythm should an unsynchronised shock be delivered during the vulnerable period from the middle and second half of the T wave? What rythm would be most likely to occur?
Long-QT syndrome type 1 (LQTS1) predisposes people to malignant polymorphic ventricular arrhythmias (in particular, torsades de pointes) which can lead to syncope, cardiac arrest or sudden cardiac death.
An electric shock occurring on the heart outside of the refractory QRS period has the possibility to send a person into Ventricular Fibrillation (a fatal rhythm) even without any underlying dysthymia. In the case of a person with Long-QT syndrome being hit by an electric shock during the vulnerable period.. the rythm they are likely to enter into is torsades. Which as we know it this rythm has a very high probablity to quickly lead right directly into Ventricular Fibrillation without immediate prompt intervention.
It is okay to look at the spark plugs in the wrong way though.. I don't agree with that statement any at all
A suggestion was made to pull spark plug wires while the engine is running. This IS a dangerous action to take and at a minimum risks some discomfort, but in the rare "worst case scenario" could be fatal.
Insulated gloves and electrician's pliers is basic common sense if you're going to be doing such a thing.
Now if you want to get into a debate about whether the possible "worst case scenario" is due to the cardiac conditions and behavior you've suggested - perhaps. However, if you can point to the appropriate peer reviewed published study from a credible journal.... then I think that's interesting enough to debate - on-topic or not....
#15
CF Veteran
Joined: Nov 2017
Posts: 3,700
Likes: 236
From: Groton, MA
Year: 1995
Model: Cherokee(XJ)
Engine: I6 4.0L
LOL! No, I had a number of technical credentials, including Invasive Cardiology.
As an aside, it's not voltage that's the problem, it's amperage x time. The danger zone is about 100-200 milliamps. The cardiac arrythmia is pretty much ventricular fibrillation. Had one incident where a father-son were working with a aluminum ladder and touched the incoming power line. Horrible.
As an aside, it's not voltage that's the problem, it's amperage x time. The danger zone is about 100-200 milliamps. The cardiac arrythmia is pretty much ventricular fibrillation. Had one incident where a father-son were working with a aluminum ladder and touched the incoming power line. Horrible.
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