I have a 91 nissan pick up automatic 4 cyl. when i drive it makes a knocking sound right under where the bed and cab meet. so i looked under nether the truck and there is something that the drive shaft sits on before going to the rear axel its right next to the gas tank. is some rubber thing and its torn and my drive shaft is loose and i dont know the name of that part and how to change it can u help me?
Could be your u- joint.Here's a link,if this is not it,let me know and we will keep looking,I have a 85 Nissan 4x4 and had to replace both parts that hold the u- joint,kept vibrating and had loss of power,was making a noise that was hard to pin point.
SOURCE: The rear problem with a 1999 gmc sierra truck
do you know if you have a limited slip rear diff?
if you do your grease is worn out or if the fluid was replaced it need to have a friction modifier put in the diff (can be found at any auto part stores.)
if its not a limited slip diff you might have spider gears going bad. then you need to remove the cover on the diff and inspect your spider gears
and these are the spider gears
and this is what a limited slip looks like
good luck
and dont forget to rate my answer
thanks
paul
SOURCE: 201 KIA RIO MAKING A CRANKING/KNOCKING SOUND UNDER CAR WHY?
drive shaft uj change transmission shaft or possibly both
SOURCE: high idle speed on 1987 ford F150
it may be this or the ( pcv valve ) pcv get clogged alot on old fords.The idle air control valve (IAC) control the engine idle speed and dashpot functions. The valve is located on the throttlebody . This valve allows air to bypass the throttle plate. The amount of air is determined by the Powertrain Control Module (PCM) and controlled by a duty cycle signal.
TESTING
Due to the diode in the solenoid, place the ohmmeter positive lead on the VPWR pin and the negative lead on the ISC pin.
SOURCE: front drive shaft/transfer case removal 03 chevy trailblazer 4wd
Sounds like you got it. They are heavy and ocward (spelling?). As for the front drive shaft take the bolts out and give it a couple of wacks with a dead blow hammer then slide it out. Maybe a few days before hand give it a good spray down with wd40 or like product. Also when you get to the last bolt for the t-case to trans loosen it half way then put a drain bucket under it and seperate it a little and let the trans fluid drain some, or you will be wearing it.
SOURCE: Gas gauge in the dash malfunctioning - 1990 Nissan Hardbody truck
It sounds like the float on the sending unit is sinking. Don't know what the float is made of, but over time, it will soak up gas and start to get heavy. This would cause your problem. I don't think it's the gauge, but if you want to test it, disconnect the wires at the tank. The gauge will either go to full or empty. If you ground the sending wire, the gauge should respond the opposite way it was. good luck
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