• Welcome to the new NAXJA Forum! If your password does not work, please use "Forgot your password?" link on the log-in page. Please feel free to reach out to [email protected] if we can provide any assistance.

knock ?

C

ChipsXJ

NAXJA Forum User
Location
Broken Arrow, OK
92 xj 4.0 165000 miles with bad knock.

restore does not help.
flex plate bolts tight.
pulling spark plug wires do not make sound change.
knock speeds up with rpms but does not get worse.

any ideas? exhaust manifold is cracked. will cracked exhaust manifold cause knock?
 
My manifold is cracked real badly. I wouldn't call the noise an exhaust leak makes a "knock". Almost more of a tick. Can you use a section of fuel line like a stethoscope and get underneath it and see if it's more pronounced by the oil pan?
 
Yah that sounds like crap.

Get underneath it and start touching parts of the engine, specifically the oil pan, where the front and rear main seals are, etc... Try to feel where the ticking/knocking sound might be originating.

Also use the fuel line as a stethoscope to see if you can find where its coming from
 
i have a 99' with 168000 that has the same sound coming from it, although not as bad, and i also used to have a 91 yj that sounded more like yours. i am not exactly sure what it is, but on mine it always seems to be coming from inside the intake manifold. i am not sure what to do about mine either, so if someone knows anything i can use the help as well!!:D
 
Sounded like a lifter tapping mixed in with the broken exhaust manifold. Fix the exhaust and it will be easier to narrow it down.
 
You must log in or register to reply here.

Similar threads

D
Chasing misfire and running out of variables.
2
Replies
21
Views
3K
deloxx
D
D
How to test PCM output/wiring for injector?
Replies
6
Views
2K
GravyDavey
G
S
2000 STFTs stuck at 98% ??
Replies
8
Views
2K
RCP Phx
R
L
Multiple misfire Issue. P0300, P0301, P0302
Replies
8
Views
2K
HRDROKN
H
S
Mysterious tick
Replies
19
Views
3K
denverd1
denverd1
Back
Top