shawninvancouver Posted June 14, 2021 Report Share Posted June 14, 2021 i get a bang bang bang or knocking under armrest area when car is driving.. then it wont go anywhere.. i put in neutral and rev a bit then back in gear and it goes... whats making that noise??? Quote Link to comment
datzenmike Posted June 14, 2021 Report Share Posted June 14, 2021 Transmission mount is loose. Exhaust pipe hanger broken or loose. U joint in drive shaft is bad. Quote Link to comment
banzai510(hainz) Posted June 14, 2021 Report Share Posted June 14, 2021 time to sell it Quote Link to comment
shawninvancouver Posted June 14, 2021 Author Report Share Posted June 14, 2021 ha.. last thing to fix.... Quote Link to comment
shawninvancouver Posted June 15, 2021 Author Report Share Posted June 15, 2021 does anything look off or wrong here??? that would be making noise... Quote Link to comment
datzenmike Posted June 15, 2021 Report Share Posted June 15, 2021 I don't see anything obvious. Exhaust pipe may be rubbing something. That's not under the console. That's back at the differential area. The sound may be traveling back up the driveshaft. Or be the driveshaft. Lift the rear wheels and place in gear. Grip the driveshaft at the front U joint and try to shove side to side and up and down. The transmission may move slightly but over all it is on 'solid' rubber mounts. If there is wear in the U joint you will feel it in your hands. There should be no movement other than slight turning or rotational. Now do the rear U joint at the differential. It can turn but must not wiggle at right angles. Give the exhaust pipe a good hard shake in all directions. Does it hit anything? Give the differential a good hard shake in all directions. It should have a rubbery but firm mounting to the body. Quote Link to comment
shawninvancouver Posted June 16, 2021 Author Report Share Posted June 16, 2021 to me it feels like the rear U joint - -- if it is - will this work as a replacement??? https://www.danaaftermarket.com/spicer-automotive/automotive-driveshaft/universal-joints/part/universal-joint/5-1501X?cat1=0&str=5-155X&cp=0&catalog=PIMS_NA&partType=PART Quote Link to comment
datzenmike Posted June 16, 2021 Report Share Posted June 16, 2021 A greas-able U joint is best. The driveshaft and U joint should turn only. There should be zero movement or looseness in the joint itself. If you hold the differential end still and can wiggle the driveshaft that's not right. Quote Link to comment
thisismatt Posted June 16, 2021 Report Share Posted June 16, 2021 Why is everybody glazing over the part about "then it wont go anywhere.. i put in neutral and rev a bit then back in gear and it goes". Am I reading this wrong or do you actually lose all power to the ground? Quote Link to comment
datzenmike Posted June 16, 2021 Report Share Posted June 16, 2021 I ignored it because it made no sense. If this is an automatic it might. Shaun... is this an automatic car???? Quote Link to comment
shawninvancouver Posted June 16, 2021 Author Report Share Posted June 16, 2021 its a 4 speed... i cant really recall what happened.. we drove it a few times.. i drove around the block and at one point got stuck.. im not an expert manual driver.. maybe it was not fully in gear - it was like i was revving it and was not going anywhere and it was going to die, so i put it in neutral to rev it... after that back in first and who knows what was going on.. i finnaly got back to the starting point. when i got there i gave it a few revs in neutral and heard the knocking noise.. my pal never heard the knocking when he was driving but he may have been going faster. i was driving super slow... Quote Link to comment
datzenmike Posted June 16, 2021 Report Share Posted June 16, 2021 Revving in neutral? then the driveshaft won't be being turned. Give the exhaust pipe a really hard shake. Quote Link to comment
banzai510(hainz) Posted June 16, 2021 Report Share Posted June 16, 2021 spicer is the ones to get. but how you know its a half shft U joint or a drive line U joint? Quote Link to comment
A guy named Rick Posted June 16, 2021 Report Share Posted June 16, 2021 on my 240Z, about 10 years ago i noticed what sounded almost like an impact wrench when letting off the gas, in the rear of the car. did the U joints, and the needle bearings had disintegrated to rusty dust lol. it was very bad. i wish i had taken pics of it back then. Quote Link to comment
shawninvancouver Posted June 16, 2021 Author Report Share Posted June 16, 2021 banging was near back of seat area near ledge behind seat/ i will assume rear u joint Quote Link to comment
A guy named Rick Posted June 16, 2021 Report Share Posted June 16, 2021 more than likely. man, i was pouring my needle bearings out it was so bad. Quote Link to comment
banzai510(hainz) Posted June 16, 2021 Report Share Posted June 16, 2021 (edited) why dont you jack up rear go under there . leave in gear and move the rear wheel back and forst and see if you see any slop inbetween all the U joints/ then go to the other wheels also and go back and forth. and look. the fwd most u joint will be had to see. I have never had a driveline u joint go bad all mine been halfshaft z cars have a diff mount that wears out also. so if the U joints look good then itsw more or less that then. get a fat guy and bounce on rear of car ,maybe a strut cartridge gland nut is loose and bouncing Edited June 16, 2021 by banzai510(hainz) Quote Link to comment
shawninvancouver Posted June 16, 2021 Author Report Share Posted June 16, 2021 can you show me an image of a half shaft? i just though a u joint in rear and a u joint in front.. Quote Link to comment
datzenmike Posted June 16, 2021 Report Share Posted June 16, 2021 U joints vibrate they don't bang. They can squeak and make pinging sounds when dry. Loose exhaust pipe and muffler can bang the under side of the floor. You check and eliminate this yet???? Exhaust system on carburetor vehicles can have popping sound in exhaust pipe on deceleration. Check lug nuts are tight Quote Link to comment
A guy named Rick Posted June 16, 2021 Report Share Posted June 16, 2021 lol Mike, mine was banging. replaced them and it went away. only did it on deceleration though. could be because the fact they were so bad and didn't want to move. like i was saying, the needle bearings disintegrated. Quote Link to comment
banzai510(hainz) Posted June 16, 2021 Report Share Posted June 16, 2021 47 minutes ago, shawninvancouver said: can you show me an image of a half shaft? i just though a u joint in rear and a u joint in front. God Damn this isnt that hard to figure out.!!! How does you back wheels turn? look there are U joints there also Quote Link to comment
shawninvancouver Posted June 16, 2021 Author Report Share Posted June 16, 2021 the banging/ knocking was happening when in neutral... i think Quote Link to comment
shawninvancouver Posted June 16, 2021 Author Report Share Posted June 16, 2021 i will be driving it to the shop tomorrow.. i will need to take notes... Quote Link to comment
A guy named Rick Posted June 16, 2021 Report Share Posted June 16, 2021 12 minutes ago, shawninvancouver said: the banging/ knocking was happening when in neutral... i think lol oh yeah i forget i had one of the rare automatic 240Z's lol. swapped that out though for a 5-speed. Quote Link to comment
datzenmike Posted June 16, 2021 Report Share Posted June 16, 2021 2 hours ago, shawninvancouver said: the banging/ knocking was happening when in neutral... i think Coasting??? Quote Link to comment
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