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1995 Nissan Pathfinder Trouble
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#11
 
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Re: 1995 Nissan Pathfinder Trouble -
09-21-2004
, 09:37 AM
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On Mon, 20 Sep 2004 19:12:38 GMT, "Jim Rojas" jrojas (AT) tech-man (DOT) com>,wrote: I have a 1995 Nissan Pathfinder 4x4 V6 with 118K miles, that is giving me some minor trouble. 1. Upon starting, I sometimes hear valve tapping sounds coming from the engine, which would mean to me that the oil is not circulating properly. This quickly goes away after 3-5 seconds. I just changed the oil to 20w50, and I added some Lucas heavy duty oil stabilizer. The problem went away only for a few days. Not a problem to be concerned at 118K miles. Doesn't mean a lack of oil circulation either. Just a lifter that loses its prime. Once again that's normal wear. Be concerned if it stays noisy. 2. I get a slight exceleration knock using 87 octane fuel. I added Marvelous Mystery Oil, but the problem quickly return a few days later. Any suggestions? Use a higher octane fuel. The knock is probably of minimal importance to an engine with 118K miles on it. Thank you Jim Rojas |
#12
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I have a 1989 Nissan 4x4 pickup with 170K miles....I use the same fuel and filter. No trouble with that vehicle at all. Jim Rojas "Meat-->Plow" <Meat (AT) petitmorte (DOT) net> wrote in message news:8960l09dqmhjl6ukc8bg80ksn6ua09h607 (AT) 4ax (DOT) com... On Mon, 20 Sep 2004 19:12:38 GMT, "Jim Rojas" jrojas (AT) tech-man (DOT) com>,wrote: I have a 1995 Nissan Pathfinder 4x4 V6 with 118K miles, that is giving me some minor trouble. 1. Upon starting, I sometimes hear valve tapping sounds coming from the engine, which would mean to me that the oil is not circulating properly. This quickly goes away after 3-5 seconds. I just changed the oil to 20w50, and I added some Lucas heavy duty oil stabilizer. The problem went away only for a few days. Not a problem to be concerned at 118K miles. Doesn't mean a lack of oil circulation either. Just a lifter that loses its prime. Once again that's normal wear. Be concerned if it stays noisy. 2. I get a slight exceleration knock using 87 octane fuel. I added Marvelous Mystery Oil, but the problem quickly return a few days later. Any suggestions? Use a higher octane fuel. The knock is probably of minimal importance to an engine with 118K miles on it. Thank you Jim Rojas |
#13
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On Tue, 21 Sep 2004 14:41:43 GMT, "Shawn" maverick50616 (AT) mchsi (DOT) com>,wrote: I own a 94 Pathfinder with 185,045 miles and had the same tapping sound at start-up as you describe and had a slight knock at acceleration also. First off, Pathfinders have a known issue with the exhaust manifold bolts breaking off in the head, which was the case with mine also, the tapping noise would go away after about 5 to 10 seconds at which time the heads would be warm enough to expand and hold the bolts tight. As was the case with my pathfinder, I had to replace the exhaust manifolds because they had warped but if caught early enough, you should be able to avoid replacing the manifolds, and I replaced the exhaust studs with stronger hardened ones. Now as for the knocking at accel problem, I tried different heat range plugs untill the knocking didnt happen anymore upon acceleration, I cant remember the heat range of the plugs that I used though. Do a search on the net and you will find alot of other people with the same tapping sound at start up and 9 times out of 10 it was caused by broken exhaust studs tapping around in the head. I hope this helped a bit. Just where in the head were these broken studs "tapping around" I really don't understand what that means. It's not the bolts tapping. It is the subsequent exhaust leak that |
warms up. Mine did it for 60,000 mmiles and I never did get around to
fixing it. The fix is to have the warped manifolds milled flat and
replace all of the studs. If you buy new manifolds, they will simply
warp again.
-Rob
#14
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On Wed, 22 Sep 2004 14:30:02 GMT, Rob Munach xlengr (AT) mindspring (DOT) com>,wrote: Meat-->Plow wrote: On Tue, 21 Sep 2004 14:41:43 GMT, "Shawn" maverick50616 (AT) mchsi (DOT) com>,wrote: I own a 94 Pathfinder with 185,045 miles and had the same tapping sound at start-up as you describe and had a slight knock at acceleration also. First off, Pathfinders have a known issue with the exhaust manifold bolts breaking off in the head, which was the case with mine also, the tapping noise would go away after about 5 to 10 seconds at which time the heads would be warm enough to expand and hold the bolts tight. As was the case with my pathfinder, I had to replace the exhaust manifolds because they had warped but if caught early enough, you should be able to avoid replacing the manifolds, and I replaced the exhaust studs with stronger hardened ones. Now as for the knocking at accel problem, I tried different heat range plugs untill the knocking didnt happen anymore upon acceleration, I cant remember the heat range of the plugs that I used though. Do a search on the net and you will find alot of other people with the same tapping sound at start up and 9 times out of 10 it was caused by broken exhaust studs tapping around in the head. I hope this helped a bit. Just where in the head were these broken studs "tapping around" I really don't understand what that means. It's not the bolts tapping. It is the subsequent exhaust leak that causes the "tapping' noise. Typically, this goes away after the manifold warms up. Mine did it for 60,000 mmiles and I never did get around to fixing it. I know that for crying out loud. I was quoting the person I replied to. The fix is to have the warped manifolds milled flat and replace all of the studs. If you buy new manifolds, they will simply warp again. -Rob What's the difference between new manifolds and the old manifolds being milled? The cause of the problem is the manifolds warping. If you take one that |
eventually warp. (this is what an experienced nissan tech told me anyhow).
#15
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What's the difference between new manifolds and the old manifolds being milled? The cause of the problem is the manifolds warping. If you take one that is already warped and mill it flat, it will stay flat. The new ones will eventually warp. (this is what an experienced nissan tech told me anyhow). I would have figured Nissan would have found a fix for OEM manifolds. |
You would think so! However, they still do it to this day - even on the
new Frontiers with the VG33 engines. Fortunately, the rest of the
vehicle is pretty much bulletproof, so I can't complain too much.
#16
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On Sat, 25 Sep 2004 11:34:47 GMT, Rob Munach xlengr (AT) mindspring (DOT) com>,wrote: What's the difference between new manifolds and the old manifolds being milled? The cause of the problem is the manifolds warping. If you take one that is already warped and mill it flat, it will stay flat. The new ones will eventually warp. (this is what an experienced nissan tech told me anyhow). I would have figured Nissan would have found a fix for OEM manifolds. You would think so! However, they still do it to this day - even on the new Frontiers with the VG33 engines. Fortunately, the rest of the vehicle is pretty much bulletproof, so I can't complain too much. New 3.3 engines bust studs? WOW! That's just not right. I hear ya. Hopefully, the new Frontier with the VQ 4.0l won't do it! |
#17
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On Tue, 21 Sep 2004 13:37:36 GMT, "Jim Rojas" jrojas (AT) tech-man (DOT) com>,wrote: I have a 1989 Nissan 4x4 pickup with 170K miles....I use the same fuel and filter. No trouble with that vehicle at all. Jim Rojas It's only a fair comparison if the two vehicles have the same motor. Somebody said exhaust manifold and broken studs. I've heard that plenty. Even seen it twice in person as a couple good friends own a very busy muffler shop. Motors in that vehicle (95 Pathpuppy) of that design did have exhaust and manifold issues. "Meat-->Plow" <Meat (AT) petitmorte (DOT) net> wrote in message news:8960l09dqmhjl6ukc8bg80ksn6ua09h607 (AT) 4ax (DOT) com... On Mon, 20 Sep 2004 19:12:38 GMT, "Jim Rojas" jrojas (AT) tech-man (DOT) com>,wrote: I have a 1995 Nissan Pathfinder 4x4 V6 with 118K miles, that is giving me some minor trouble. 1. Upon starting, I sometimes hear valve tapping sounds coming from the engine, which would mean to me that the oil is not circulating properly. This quickly goes away after 3-5 seconds. I just changed the oil to 20w50, and I added some Lucas heavy duty oil stabilizer. The problem went away only for a few days. Not a problem to be concerned at 118K miles. Doesn't mean a lack of oil circulation either. Just a lifter that loses its prime. Once again that's normal wear. Be concerned if it stays noisy. 2. I get a slight exceleration knock using 87 octane fuel. I added Marvelous Mystery Oil, but the problem quickly return a few days later. Any suggestions? Use a higher octane fuel. The knock is probably of minimal importance to an engine with 118K miles on it. Thank you Jim Rojas |
was the exhaust manifold issue (92 Pathfinder, 90k miles).
Here is the obvious lesson- there are two exhaust gasgets that need
replacement (right and left). I did just the right, then the left went
out about 3 months later. Cost per side assuming just the gasget, studs
and labor was $550.
#18
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"Meat-->Plow" <Meat (AT) petitmorte (DOT) net> wrote in news:hoi1l0h8qtd42nghncquj9k8nlk6uf700j (AT) 4ax (DOT) com: On Tue, 21 Sep 2004 13:37:36 GMT, "Jim Rojas" jrojas (AT) tech-man (DOT) com>,wrote: I have a 1989 Nissan 4x4 pickup with 170K miles....I use the same fuel and filter. No trouble with that vehicle at all. Jim Rojas It's only a fair comparison if the two vehicles have the same motor. Somebody said exhaust manifold and broken studs. I've heard that plenty. Even seen it twice in person as a couple good friends own a very busy muffler shop. Motors in that vehicle (95 Pathpuppy) of that design did have exhaust and manifold issues. "Meat-->Plow" <Meat (AT) petitmorte (DOT) net> wrote in message news:8960l09dqmhjl6ukc8bg80ksn6ua09h607 (AT) 4ax (DOT) com... On Mon, 20 Sep 2004 19:12:38 GMT, "Jim Rojas" jrojas (AT) tech-man (DOT) com>,wrote: I have a 1995 Nissan Pathfinder 4x4 V6 with 118K miles, that is giving me some minor trouble. 1. Upon starting, I sometimes hear valve tapping sounds coming from the engine, which would mean to me that the oil is not circulating properly. This quickly goes away after 3-5 seconds. I just changed the oil to 20w50, and I added some Lucas heavy duty oil stabilizer. The problem went away only for a few days. Not a problem to be concerned at 118K miles. Doesn't mean a lack of oil circulation either. Just a lifter that loses its prime. Once again that's normal wear. Be concerned if it stays noisy. 2. I get a slight exceleration knock using 87 octane fuel. I added Marvelous Mystery Oil, but the problem quickly return a few days later. Any suggestions? Use a higher octane fuel. The knock is probably of minimal importance to an engine with 118K miles on it. Thank you Jim Rojas I had the exact same problem- could have sworn it was the valves. It was the exhaust manifold issue (92 Pathfinder, 90k miles). Here is the obvious lesson- there are two exhaust gasgets that need replacement (right and left). I did just the right, then the left went out about 3 months later. Cost per side assuming just the gasget, studs and labor was $550. |
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