[89&90COUPES]

what type of engine damage can occur if you do not back off your timing? i recently installed a wet nitrous kit on my 1990 mustang and now i have a knocking in the engine( car does not smoke and doesnt seem to have lost any power) car doesnt burn oil and car doesnt leak the knocking only occurs when i get up around 2500-3000 rpms and if you put the car in neutral and rev the engine the car doesnt knock.....any suggestions??? could it be a timing issue or burnt piston??thanks for any info in advance(also i know now that i should have back off on the timing 2 degrees for every 50hp but didnt know then....the guy that installed the nitrous has been running nitrous for over 8 years on cars i would have thought that he would have advised me that)

[410cougar]

first thing first. pull of all the plugs and check and see if any are black.
after that id do compression check.

Id prob run a range or so colder plug then stock as well as get a air fuel gauge and watch if its leaning out.

j

[89&90COUPES]

i'll try that next...appreciate the info

[coolwaterblvd]

Make sure your fuel system is good and clean out your MAF, alond with replacing your plugs.