Re: Help diagnose this noise 2
jeepeeyes proclaimed:
> Thanks for the responses. > I think that I will take DougW's advice first and look at the spark > plugs. I replaced all of them last year, but that does not mean one > couldn't fail. > Then, if they all look good, I will buy the stethoscope and carry it in > the Jeep ('cause it always happens out in the boondies) and probe for > the source of the knock the next time I hear it. > Oh, by the way, I've already inspected the exhaust manifold and there > seem to be no signs of cracks. > There are two major categories of mechanic stethoscopes. The inexpensive ones are between $10 to $20 and are purely mechanical with just air from the probe up to your ears--the earpieces are typically earbuds. e.g. http://www.brandsonsale.com/ht-001057-images.html For about $150, you can get the amplified version with the larger ear mikes like a set of stereo headphones. e.g. http://www.alltiresupply.com/p-OTC-3590.html |
Re: Help diagnose this noise 2
jeepeeyes proclaimed:
> Thanks for the responses. > I think that I will take DougW's advice first and look at the spark > plugs. I replaced all of them last year, but that does not mean one > couldn't fail. > Then, if they all look good, I will buy the stethoscope and carry it in > the Jeep ('cause it always happens out in the boondies) and probe for > the source of the knock the next time I hear it. > Oh, by the way, I've already inspected the exhaust manifold and there > seem to be no signs of cracks. > There are two major categories of mechanic stethoscopes. The inexpensive ones are between $10 to $20 and are purely mechanical with just air from the probe up to your ears--the earpieces are typically earbuds. e.g. http://www.brandsonsale.com/ht-001057-images.html For about $150, you can get the amplified version with the larger ear mikes like a set of stereo headphones. e.g. http://www.alltiresupply.com/p-OTC-3590.html |
Re: Help diagnose this noise 2
smack the cat. converter and see if it rattles if it does it is no good and
i have seen them make a noise that sounds just like a rod knockesp in the trucks jeepeeyes wrote: > Hi group, > > I own a 2000 Jeep Wrangler 4.0 Automatic with about 70K miles on it. > After a period of driving at slightly heavier than normal engine load > on hot days, a knocking sound starts coming from the engine > compartment. > > I think that the noise I've been experiencing is most likely coming > from within the engine or maybe the transmission. The first time I'd > experienced it I was driving through some sandy washes in Mojave. As > the engine and transmission load in the sand increased the engine > temperature went up (but well within the safe zone) and I started > hearing at first a tapping noise that gradually grew louder to a > pronounced knocking (like a small hammer hitting metal) in sync with > the engine RPMs. I stopped and put the transmission in park with the > engine idling, but the knocking continued. I opened the hood and tried > to listen where the knocking was coming from. It was pretty loud and > hard to tell where in the engine compartment it was coming from. It > almost felt like I was hearing it louder from under the vehicle when I > leaned down and listened to it from the side while looking at the > transmission. > At that time, I shut the engine off and waited for about 15 minutes. > Then I started the engine and the knocking was gone. I continued > driving slowly at lower gear in order to reduce the load on the engine, > which seemed to help. But still the knocking would come back at times > and I had to really slow down or stop for it to go away. > > The best guess, I figured from the frequency of the knock (about > 8/sec), would point to a something occurring every other engine > revolution like a valve. > > When I first got the Jeep a year ago, I had no trouble driving up a > long hill on a paved road at a fairly normal rate of speed. Now a > couple months ago, I experienced the knocking again as I drove on a > road like that (paved, no sand) to the mountains on a hot day. > Most recently, I started hearing the knocking slightly after a period > of stop-and-go driving on pavement in rather benign hilly area. > > So the knocking seems to start after a period of heavier than normal > engine load on hot days (though the engine temperature gauge always > remains well within the safe zone). > > I would appreciate any ideas on what this might be and what if anything > can be done about this. > > Thanks. |
Re: Help diagnose this noise 2
smack the cat. converter and see if it rattles if it does it is no good and
i have seen them make a noise that sounds just like a rod knockesp in the trucks jeepeeyes wrote: > Hi group, > > I own a 2000 Jeep Wrangler 4.0 Automatic with about 70K miles on it. > After a period of driving at slightly heavier than normal engine load > on hot days, a knocking sound starts coming from the engine > compartment. > > I think that the noise I've been experiencing is most likely coming > from within the engine or maybe the transmission. The first time I'd > experienced it I was driving through some sandy washes in Mojave. As > the engine and transmission load in the sand increased the engine > temperature went up (but well within the safe zone) and I started > hearing at first a tapping noise that gradually grew louder to a > pronounced knocking (like a small hammer hitting metal) in sync with > the engine RPMs. I stopped and put the transmission in park with the > engine idling, but the knocking continued. I opened the hood and tried > to listen where the knocking was coming from. It was pretty loud and > hard to tell where in the engine compartment it was coming from. It > almost felt like I was hearing it louder from under the vehicle when I > leaned down and listened to it from the side while looking at the > transmission. > At that time, I shut the engine off and waited for about 15 minutes. > Then I started the engine and the knocking was gone. I continued > driving slowly at lower gear in order to reduce the load on the engine, > which seemed to help. But still the knocking would come back at times > and I had to really slow down or stop for it to go away. > > The best guess, I figured from the frequency of the knock (about > 8/sec), would point to a something occurring every other engine > revolution like a valve. > > When I first got the Jeep a year ago, I had no trouble driving up a > long hill on a paved road at a fairly normal rate of speed. Now a > couple months ago, I experienced the knocking again as I drove on a > road like that (paved, no sand) to the mountains on a hot day. > Most recently, I started hearing the knocking slightly after a period > of stop-and-go driving on pavement in rather benign hilly area. > > So the knocking seems to start after a period of heavier than normal > engine load on hot days (though the engine temperature gauge always > remains well within the safe zone). > > I would appreciate any ideas on what this might be and what if anything > can be done about this. > > Thanks. |
Re: Help diagnose this noise 2
smack the cat. converter and see if it rattles if it does it is no good and
i have seen them make a noise that sounds just like a rod knockesp in the trucks jeepeeyes wrote: > Hi group, > > I own a 2000 Jeep Wrangler 4.0 Automatic with about 70K miles on it. > After a period of driving at slightly heavier than normal engine load > on hot days, a knocking sound starts coming from the engine > compartment. > > I think that the noise I've been experiencing is most likely coming > from within the engine or maybe the transmission. The first time I'd > experienced it I was driving through some sandy washes in Mojave. As > the engine and transmission load in the sand increased the engine > temperature went up (but well within the safe zone) and I started > hearing at first a tapping noise that gradually grew louder to a > pronounced knocking (like a small hammer hitting metal) in sync with > the engine RPMs. I stopped and put the transmission in park with the > engine idling, but the knocking continued. I opened the hood and tried > to listen where the knocking was coming from. It was pretty loud and > hard to tell where in the engine compartment it was coming from. It > almost felt like I was hearing it louder from under the vehicle when I > leaned down and listened to it from the side while looking at the > transmission. > At that time, I shut the engine off and waited for about 15 minutes. > Then I started the engine and the knocking was gone. I continued > driving slowly at lower gear in order to reduce the load on the engine, > which seemed to help. But still the knocking would come back at times > and I had to really slow down or stop for it to go away. > > The best guess, I figured from the frequency of the knock (about > 8/sec), would point to a something occurring every other engine > revolution like a valve. > > When I first got the Jeep a year ago, I had no trouble driving up a > long hill on a paved road at a fairly normal rate of speed. Now a > couple months ago, I experienced the knocking again as I drove on a > road like that (paved, no sand) to the mountains on a hot day. > Most recently, I started hearing the knocking slightly after a period > of stop-and-go driving on pavement in rather benign hilly area. > > So the knocking seems to start after a period of heavier than normal > engine load on hot days (though the engine temperature gauge always > remains well within the safe zone). > > I would appreciate any ideas on what this might be and what if anything > can be done about this. > > Thanks. |
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