jbernie3

I'm having trouble getting rid of the spark knock in my 94 5.0.

Obviously I checked the timing and it was set at 9 (it should be 10, right?). So I advanced it to 10, and then 12 and I still have the spark knock.

What are some other causes of spark knock?

Thanks for your help!

Quik

spark knock????? one you get pinging from to much timing. if you hear knocking its your motor. if anything if your at 10*BTDC and hearing pinging one bad fuel or your dist. is off a few teeth

619socalstang

spark knock that is like piston return srings only found on really,really very fast cars most of us dont have the pleasure of owning. ohsoq is correct knocking is not caused by spark, but could be a vavle,lifter,rod, get it checked. or maybe you meant pinging, again ohsoq is right.

mmoto68

if it's not your timing, it could be:

timing chain stretched
bad gas
air filter clogged
cats clogged

I have a '95 and at some point the above have given me a problem

vfast

it's teeth not tooths*L*.... I agree with above it might be a timing chain..put some 93 in it and see if it quits?..that's where I would start it's the cheapest fix.....if this doesn't retard the time to 6 or so see what happens..we can go from there if this doesn't help
how many miles on this thing????

TheGmKiller331

Your timing chain could have jumped a few teeth also.

This could be any number of things we need more info.Have you messed with anything?Or done anything to it?

Turtle

Do you hear it on acceleration only? If so then it probably is spark knock. High compression engines have this problem on pump gas. If you are running a stock compression ratio with plugs that you may have other problems. Is it high pitched or a constant metal on metal knock? try retarding the timing. Try higher octane gas. If it goes away then it was also probably Spark Knock. Spark knock can easily destroy pistons and cylinders. This is a problem that should be figured out immediately and not drivin on.

hotrodman

carbon on piston tops,,cheap gas ,,allways super for my babys,,

new25.0

if it is really "spark rattle" or knock but a bottle or 2 of chevron fuel system cleaner its in a black bottle, had this problem with my explorer and it cleared right up.

vfast

bg products makes some killer cleaners