Pbpredator Posted September 16, 2011 Share Posted September 16, 2011 My 1995 Nissan pathfinder is making a funny sound (going to try to post video tonight) but for now ill try to describe it. Its a fluttering whistle ticking that gets louder/worse with increase on rpm also gets worse if im going down a decline in gear without giving gas(under load?) Also this sound goes away over long trips or when warmed up? Started very slightly at first Some say its a lifter? But dohc doesn't have lifters right? Others say exhaust leak? Not sure... but I think I have read a lot of people saying an exhaust manifold gasket leak? So... a friend has said to do an oil change use thinner oil and use Lucas he said it will quiet right up. But if its the gasket... I was wondering if some one would give me a complete list of items needed for this gasket replacement? Would help a ton! Link to comment Share on other sites More sharing options...
silverton Posted September 16, 2011 Share Posted September 16, 2011 Is your check engine light on? I believe this is just related to the EGR, which really a big deal. Link to comment Share on other sites More sharing options...
sewebster Posted September 16, 2011 Share Posted September 16, 2011 Kinda sounds like an exhaust manifold leak, yeah. Unless you put a funky engine, you don't have DOHC, and you do have hydraulic valve lifters though You might be able to just tighten the exhaust manifolds, they can loosen. Even if this doesn't solve your problem, it might change the noise slightly, which would at least tell you if you found the problem. To actually replace them you need to replace the gaskets... and possibly the manifold to downpipe gaskets too. Lots of people have broken exhaust studs though... which means you might need some more of those, and potentially have a huge pain removing the old ones... Link to comment Share on other sites More sharing options...
Trogdor636 Posted September 16, 2011 Share Posted September 16, 2011 If its an exhaust leak, no oil change in the world is going to help. Also, your Pathy isnt DOHC. Its a SOHC engine. As for the exhaust gasket, there a good chance the studs have broken, its a common problem among our Pathfinders. There are multiple threads on the studs around here, just use the search function Link to comment Share on other sites More sharing options...
Tungsten Posted September 16, 2011 Share Posted September 16, 2011 (edited) My 1995 Nissan pathfinder is making a funny sound (going to try to post video tonight) but for now ill try to describe it. Its a fluttering whistle ticking that gets louder/worse with increase on rpm also gets worse if im going down a decline in gear without giving gas(under load?) Also this sound goes away over long trips or when warmed up? Started very slightly at first Some say its a lifter? But dohc doesn't have lifters right? Others say exhaust leak? Not sure... but I think I have read a lot of people saying an exhaust manifold gasket leak? So... a friend has said to do an oil change use thinner oil and use Lucas he said it will quiet right up. But if its the gasket... I was wondering if some one would give me a complete list of items needed for this gasket replacement? Would help a ton! That's an exhaust manifold leak. Also, this engine is a SOHC not a DOHC. Source: http://redz31.net/pages/headwork.html Edited September 16, 2011 by Tungsten Link to comment Share on other sites More sharing options...
krmiller07 Posted September 16, 2011 Share Posted September 16, 2011 That's an exhaust manifold leak. Also, this engine is a SOHC not a DOHC. Nice heads ! Tell me more. Link to comment Share on other sites More sharing options...
Tungsten Posted September 16, 2011 Share Posted September 16, 2011 These are custom ported Z31 heads from redz31.net. The Pathfinder uses the same design/style heads on its VG block too. Link to comment Share on other sites More sharing options...
Pbpredator Posted September 16, 2011 Author Share Posted September 16, 2011 (edited) If its an exhaust leak, no oil change in the world is going to help. Also, your Pathy isnt DOHC. Its a SOHC engine. As for the exhaust gasket, there a good chance the studs have broken, its a common problem among our Pathfinders. There are multiple threads on the studs around here, just use the search function I meant he said it would get rid of the sound if its a lifter... (because most likely it wasn't getting oil upon start up) In any case im going to do an oil change tonight and use gunk engine flush then use 5w-30 2.8 quarts and 1 quart of Lucas oil stabilizer see what that does... then I will replace all the exhaust gaskets and tomorrow maybe the exhaust manifold gasket... Also no to the check engine light last time I checked. Edited September 16, 2011 by Pbpredator Link to comment Share on other sites More sharing options...
Slartibartfast Posted September 16, 2011 Share Posted September 16, 2011 (edited) I've read that with the design of our engines, the Lucas stuff causes little bubbles in the oil and chews things up. It's not something I'd put in mine without doing some research. Better to figure out what the actual problem is, before it gets worse! Edited September 16, 2011 by Slartibartfast Link to comment Share on other sites More sharing options...
Pbpredator Posted September 16, 2011 Author Share Posted September 16, 2011 Here is a video of the sound sorry for vid quality its from my android phone... Link to comment Share on other sites More sharing options...
Towncivilian Posted September 16, 2011 Share Posted September 16, 2011 Don't use Lucas Oil Stabilizer, all it is is 140wt gear oil and contains no useful additives. All it does is thicken your oil to mask problems. Put in some thicker oil if you desire it, instead of a quart of nothing. Link to comment Share on other sites More sharing options...
sewebster Posted September 16, 2011 Share Posted September 16, 2011 I hear two things. The ticking when you rev it, and the "choking" when you let off the throttle. The ticking sounds consistent with exhaust to me, but hard to tell for sure. The choking is likely different than mine since you don't have a stock intake, but I wonder if it's the EGR as suggest by silverton. Perhaps try pinching off the hose to the EGR valve (I used vice grips) to prevent it from operating temporarily, then rev the engine as before and see if it sounds different. Link to comment Share on other sites More sharing options...
Tungsten Posted September 16, 2011 Share Posted September 16, 2011 Be very careful as to not confuse exhaust ticking with spark knock. Those two sound very similar but are completely different problems. An exhaust tick will be more consistent while a spark knock only occurs under certain rpms and certain load. Link to comment Share on other sites More sharing options...
madhornet Posted September 17, 2011 Share Posted September 17, 2011 100% exhaust leak check it at the egr but like mentioned before it is probably an exhaust stud loosened or broken, now is a good time to think about headers and do some research on here to fix it yourself which can take most in experienced wrench turners days a shop will charge u anywhere from $300-$600 just to fix the one side, i did headers and fixed all my bad studs (used the 350z turbo studs) my self with the engine out on a stand and i still had 8 hours of time Link to comment Share on other sites More sharing options...
adamzan Posted September 17, 2011 Share Posted September 17, 2011 Yep definitely exhaust leak. Link to comment Share on other sites More sharing options...
Pbpredator Posted September 17, 2011 Author Share Posted September 17, 2011 Link to comment Share on other sites More sharing options...
Pbpredator Posted September 17, 2011 Author Share Posted September 17, 2011 100% exhaust leak check it at the egr but like mentioned before it is probably an exhaust stud loosened or broken, now is a good time to think about headers and do some research on here to fix it yourself which can take most in experienced wrench turners days a shop will charge u anywhere from $300-$600 just to fix the one side, i did headers and fixed all my bad studs (used the 350z turbo studs) my self with the engine out on a stand and i still had 8 hours of time yeah was kind of afraid of that. I have no choice but to do it myself though... I have like no money but like i said i can get parts really cheap and I have a work shop to myself to use to do everything... Im just very inexperienced and kind of afraid of going out and taking the engine out... can i replace the headers without taking the engine out? i have the exhaust manifold gaskets on the way... and i have all of these gaskets already so I'm gonna try to replace those sunday. Link to comment Share on other sites More sharing options...
sewebster Posted September 17, 2011 Share Posted September 17, 2011 You don't have to take the engine out Link to comment Share on other sites More sharing options...
krmiller07 Posted September 17, 2011 Share Posted September 17, 2011 I agree with staying away for the Lucas Oil Stabilizer! I used the stuff on my last motor at the suggestion of a 'mechanic' and I threw a rod right out of the oil pan 200 miles later. No advances warning, No knocking...just a quick vibration through the steering wheel and A LOT of oil on the ground ! Spun all of the rod bearing's too. What was left in the pan, coated the sides like thick honey or STP oil treatment ! lol. I also later discovered that there are 2 types of the stuff. 1 for petroleum based oils, and one for synthetic, which is what I added to my Mobil 1 full synthetic. Either way, it was an exspensive lesson. Link to comment Share on other sites More sharing options...
Tungsten Posted September 17, 2011 Share Posted September 17, 2011 I used Lucas before and it made no difference but did improve the lifters on startup. Link to comment Share on other sites More sharing options...
ejin4499 Posted September 17, 2011 Share Posted September 17, 2011 100% exhaust leak check it at the egr but like mentioned before it is probably an exhaust stud loosened or broken, now is a good time to think about headers and do some research on here to fix it yourself which can take most in experienced wrench turners days a shop will charge u anywhere from $300-$600 just to fix the one side, i did headers and fixed all my bad studs (used the 350z turbo studs) my self with the engine out on a stand and i still had 8 hours of time Forget the 350 studs go get a set for a vg33 they're 10mm instead of 8. drill and tap each hole put the 10mm in bore out the bolt holes on the headers (they are really really tight if you don't) and install. Link to comment Share on other sites More sharing options...
Tungsten Posted September 17, 2011 Share Posted September 17, 2011 Drilling out to 10mm is a good idea and an improvement. However if you hate drilling heads just use the 300ZX turbo studs. Link to comment Share on other sites More sharing options...
Pbpredator Posted September 17, 2011 Author Share Posted September 17, 2011 Link to comment Share on other sites More sharing options...
Tungsten Posted September 17, 2011 Share Posted September 17, 2011 (edited) The hissing is from that cone filter you got there. What happened to the stock air box? In the other video where you rev the engine it sounds like a misfire. Check for a dead cylinder and if it's not dead then it's the exhaust studs. Edited September 17, 2011 by Tungsten Link to comment Share on other sites More sharing options...
madhornet Posted September 17, 2011 Share Posted September 17, 2011 i had to drill some out to the larger vg33 style studs aswell probably almost half but the 350z ones are a better grade material for the extra turbo weight and heat so theres a mix and they have held my pacesetter headers on for almost 3 years also i used new gaskets and the high heat copper silicone that stuff alone can almost keep a header on Link to comment Share on other sites More sharing options...
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