rpm's bouncing...

[95jordan240]

http://www.youtube.com/watch?v=rRZOu-_VFVQ

check it out shoot me some ideas...car is a 95 ka24de 240sx....and it also smells like gas after...

[Klits562]

its jumping to 2k by itself???thats fuggen odd your not hitting hte gas in the video right?

[95jordan240]

i am holding the gas down and the rpm's dont go any higher they just bounce like thatt idk man.....and did you notice how the car almost died twice when i started it....

[godofspeed666]

A Catalytic converter when it gets clogged and or melts down will cause the engine to build to much back pressure. And want be able to go over a certain rpm and or die completely. Check the back pressure and Mack sure it’s not too high.

[95jordan240]

but then wat would explain the smell of raw gas in the engine bay???

[liquid_cool]

but then wat would explain the smell of raw gas in the engine bay???

yup...as the back pressure has to go somewhere..the only place it can go..is back the way it came

[95jordan240]

and how exactly do i go about checking the back pressure and where it should be at????sorry guys some what of a noob i know how to do some stuff but haven't got to the point how all this back pressure stuff works....

[Bsh1926]

Get one of those Laser Temperature readers (any auto store) check temp of cat and before and after cat if the cat is runnin like 400 to 700 degrees your cat is clogged

[godofspeed666]

Actually using a temp gage to check back pressure is not the best. Because when the cat reaches light off temp you should actually see the temp increase after the cat by 100 degrease and it doesn’t provide an accurate depiction of what’s happing . The best way of testing back pressure is to get a back pressure gage it works by removing the 02 sensor closes to cat but not after it. Try to raise the rpm to about 2500rpm if the gage reads more then 5psi then you have to much back pressure. Don’t leave the o2 sensor out for very long because it will cause it to set a 02 sensor code.