Darek Posted June 24, 2012 Share Posted June 24, 2012 (edited) Engine in my car need few seconds to start. When it is started then loud noise of belt is heard. Sometimes the noise is short like on video and sometimes it takes even ten seconds. The noise is coming from the left side of engine block - just like on video. Probably I need to replace or tension a belt - but I don't know which belt. Would it be enough to tension or is it better to replace a belt with new one. Can the belt cause a long time of engine startup? I replaced spark plugs last month and there is no improvement in starting up. [media=] [/media] I think that this situation is worsening from month to month because previously the noise was heard only with first startup during day. Now it is happening almost every time. Edited June 24, 2012 by Darek Link to comment Share on other sites More sharing options...
theexbrit Posted June 24, 2012 Share Posted June 24, 2012 (edited) It sounds like a belt squealing. I had the same problem after I replaced all my belts, it was the alternator belt that needed adjusting on mine. As for replacing them, it depends on their condition & age.Not sure what the mileage is for belt replacement but from the age of your truck I would do them anyway. From your avatar it looks like you do a lot of "wet work" so the belts will deteriorate faster. The belts wouldn't effect the start time, from the video it didn't seem to bad if that's a cold start. Mine takes a second or two unless it's warmed up. You could try things like clean the throttle body, check the timing, check the mixture, fuel pressure, clean the injectors, etc, etc. Is the CEL on? How many miles on the truck? Edited June 24, 2012 by theexbrit Link to comment Share on other sites More sharing options...
ahardb0dy Posted June 24, 2012 Share Posted June 24, 2012 sometimes if the belt is sitting too far down in the pulley it will squeal, this can be from the wrong size belt or if it is too tight. 1 Link to comment Share on other sites More sharing options...
pathfounder Posted June 25, 2012 Share Posted June 25, 2012 You can narrow this down with a stethoscope, but you'd need someone else to start the truck obviously. I usually suspect things like bearings in an accessory, or an idler pulley. Link to comment Share on other sites More sharing options...
theexbrit Posted June 25, 2012 Share Posted June 25, 2012 I changed my idler pulley's when I did all my belts, just in case. But I figured if it was a pulley bearing it would probably do it all the time, whereas a belt only squeals when it's under the strain of the initial start/jerk action then they usually quieten down. Easy way to test, spray a little WD40 on the belt & try starting it, if it starts without the squeal then it's the belt (I know, I know, people say don't spray anything on your belts but this doesn't hurt them at all). Link to comment Share on other sites More sharing options...
ahardb0dy Posted June 25, 2012 Share Posted June 25, 2012 you can use water instead of wd40 Link to comment Share on other sites More sharing options...
Tungsten Posted June 25, 2012 Share Posted June 25, 2012 Why not just replace all the belts? If you have not done that in a while it is time to do it. Link to comment Share on other sites More sharing options...
Darek Posted June 25, 2012 Author Share Posted June 25, 2012 Ok, I'll try with replacing belts. Are those belts' part numbers correct for my vehicle (2003, 3.5 automatic, 4x4)? [11950N] BELT-POWER STEERING OIL PUMP [11720N] BELT-FAN & ALTERNATOR [11920N] BELT-COMPRESSOR Should I order any other parts (necessary or recommended) to replace together with belts? Link to comment Share on other sites More sharing options...
Towncivilian Posted June 25, 2012 Share Posted June 25, 2012 VQ35DE Pathfinders only have two belts. You don't need 11950N. Link to comment Share on other sites More sharing options...
theexbrit Posted June 25, 2012 Share Posted June 25, 2012 Why not just replace all the belts? If you have not done that in a while it is time to do it. Yeah, that's what I was suggesting in my first post. It's fairly easy & cheap, then at least you'll know they're ok. Just don't over or under tighten them. Link to comment Share on other sites More sharing options...
pathfounder Posted June 25, 2012 Share Posted June 25, 2012 Replace all the belts AFTER you find the real problem. No sense doing it all now, just to find that it was an accessory riding on the innermost belt. Link to comment Share on other sites More sharing options...
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