HELP 1995 LS400: Did i bend valve/s?
02-04-15, 11:01 AM
#1
HELP 1995 LS400: Did i bend valve/s?
I recently acquired a 1995 LS400, it was runinng really quiet from a cold start. The previous owner told me that the water pump is leaking so I decided to do the timing area and refresh everything. After reinstalling all parts back together, there was a tapping noise on cylinder number 6 which also gave me a CEL of P0306, misfire cyl # 6, after running on idle up to 15 minutes.
So i was thinking the timing was off.
I set the crank pulley to 0 TDC and each cam gear dot or line, lines up to the mark wher it should be. So got me thinking, the timing is still correct.
I also took off the passender side valve cover and check for clearance on cyl #6 and it looks fine.
I am stumped at the moment and I also recall when i was trying to remove the passenger camshaft gear I moved the gear about 45 degree counter-clockwise, but not more than 90 degree, would this cause a bent valve/s that will cause tapping noise?
Car runs but there just a tapping noise on cyl #6, if the timing is messed up it will run like crap, don't you think?
These are what I replaced so far:
Aisin WP
Cam and Crank seals
O rings
OE T-stat
209 teeth belt
New Idlers
4 o2 sensors, valve cover gaskets, NGK iridiums, plug wires, distirbutor caps and rotors, more to come.
i also checked the plug wires and ther are good/new.
So i was thinking the timing was off.
I set the crank pulley to 0 TDC and each cam gear dot or line, lines up to the mark wher it should be. So got me thinking, the timing is still correct.
I also took off the passender side valve cover and check for clearance on cyl #6 and it looks fine.
I am stumped at the moment and I also recall when i was trying to remove the passenger camshaft gear I moved the gear about 45 degree counter-clockwise, but not more than 90 degree, would this cause a bent valve/s that will cause tapping noise?
Car runs but there just a tapping noise on cyl #6, if the timing is messed up it will run like crap, don't you think?
These are what I replaced so far:
Aisin WP
Cam and Crank seals
O rings
OE T-stat
209 teeth belt
New Idlers
4 o2 sensors, valve cover gaskets, NGK iridiums, plug wires, distirbutor caps and rotors, more to come.
i also checked the plug wires and ther are good/new.
02-04-15, 11:12 AM
#2
Post #6, on that picture, both dots lined up on mine, so its not out of timing.
https://www.clublexus.com/forums/ls4...-knocking.html
I also installed 8 set of injector o rings and rewrapped all injector terminals because all wires are britlle.
I swapped injector fron cylinder number 6 to another and it still doing the same thing.
https://www.clublexus.com/forums/ls4...-knocking.html
I also installed 8 set of injector o rings and rewrapped all injector terminals because all wires are britlle.
I swapped injector fron cylinder number 6 to another and it still doing the same thing.
Last edited by JesLet; 02-04-15 at 11:27 AM.
02-04-15, 11:57 AM
#4
1995 is a non-interference engine, so I don't believe that you would have been able to bend any valves, even if the timing was off. And yes, if the timing was off, the engine would not be running smoothly. It might not be running terribly, but you would definitely notice the difference.
Sorry I can't be of more help, but hopefully that will re-assure you that your valves are not bent.
Sorry I can't be of more help, but hopefully that will re-assure you that your valves are not bent.
02-04-15, 12:10 PM
#7
yes all 95-00 are interference engines! i don't think a valve is bent. how's the condition of the caps and rotors? i would have replaced those along with the spark plugs since you are in there already. change them next to see if the problem persists. make sure you have all spark plug wires in their correct places and snug, on both caps and plugs themselves.
i mostly find that a misfire is either a bad or dying coil (not in this case bc your motor doesn't have individual coils) or the spark plugs themselves.
i mostly find that a misfire is either a bad or dying coil (not in this case bc your motor doesn't have individual coils) or the spark plugs themselves.
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02-04-15, 12:41 PM
#8
yes all 95-00 are interference engines! i don't think a valve is bent. how's the condition of the caps and rotors? i would have replaced those along with the spark plugs since you are in there already. change them next to see if the problem persists. make sure you have all spark plug wires in their correct places and snug, on both caps and plugs themselves.
i mostly find that a misfire is either a bad or dying coil (not in this case bc your motor doesn't have individual coils) or the spark plugs themselves.
i mostly find that a misfire is either a bad or dying coil (not in this case bc your motor doesn't have individual coils) or the spark plugs themselves.
I just dont understand why is it ticking.
02-04-15, 12:54 PM
#12
Just want to post pics, first pic i put a screwdriver on the cylinder which is at 0 TDC, notice the second pic in cylinder number 6 which is also at 0 TDC
Since cylinder 6 has the piston up at 0 TDC do you think i ruined the valve/s? i will find out once i do the leak down test
Since cylinder 6 has the piston up at 0 TDC do you think i ruined the valve/s? i will find out once i do the leak down test
02-04-15, 04:51 PM
#15
Hey guys, what will happen if one of the wire of the knock sensor is cut?
I saw videos on youtube that if the knock sensor is bad it will retard the timing.
i asked becuase the wires from my knock sensors are brittle and have a little bit of wire exposed. I rewrapped them with electrical tape with just one hand since they are under the intake manifold... kind of half-*** job and i dont know if i snapped a wire.
I saw videos on youtube that if the knock sensor is bad it will retard the timing.
i asked becuase the wires from my knock sensors are brittle and have a little bit of wire exposed. I rewrapped them with electrical tape with just one hand since they are under the intake manifold... kind of half-*** job and i dont know if i snapped a wire.