26/08/2026
This vehicle was in a few weeks ago fot some repairs and upgrades, 2 weeks later is towed back into the shop with a terrible missfire after some diag we found plugs are excessively warn and leads have deteriorated, replaced the plugs and upgraded the leads to 9 mm ice ignition leads the vehicle did not change the missfire so we ran a comp test and found cylinder 3 had 0 compression then to point us in the right direction we carried out a leak down test then heard air escaping from the intake manifold so we removed the rocker cover and found a broken intake valve spring for cylinder 3 , removed the spring and reseated the valve and carried out a leak down test again this time it passed insuring no major damage to the engine because the valve was stuck open at all times luckily did not make contact with the piston so we upgraded all the valve springs to mellings single heavy duty valve springs and threw a new set of ngk ignition coils on also due to the car had a weak spark on a few cylinders after all this work the car was road tested for over and hour and passed with flying colours returned to a happy customer who narrowly missed a enormous engine rebuild cost lucky for him call TOPGUN PERFORMANCE on 95618055 to upgrade your valve springs on your ls so you dont experience this, single mellings springs 1100 and dual springs will come with new stem seals and retainers 1600 get in touch 👍✅✅✅