ccanterb

Help Broken timing chain Optispark missing p0300
I am having a problem with my 97 Camaro z28. Mostly stock. Mods = SLP cold air, short headers and Hypertech programming. I broke my timing chain about a week ago. I am doing all the work my self. In the past have replaced my opti-spark twice and plugs, wires and water pump once. it has 202,000 miles on it and has no blowby yet.

Work done since I broke the timing chain. New chain and gears, exchanged opti for new one at Autozone(lifetime warranty). I used the old cap and rotor cleaned the very well with Superclean and cleaned all the contacts with emery cloth. I lined the dots up on the timing chain and gears crank at 12 oclock and cam at 6 oclock. Installed every thing fine but the car misses like hell. and my code reder says p0300 RANDOM MULTI cylinder miss fire.

Could I have damaged the cap or roter by getting them wet during cleaning or maybe the optisoark is a bad one out of the box. Possibly I was off a tooth on the timing chain(not likly but possible). Any help would be appricated.

1NCZ28

Everytime I HAVE DONE A CAM, THE DOTS ARE LINED UP, DOT TO DOT AND THEN YOU SPIN THE ENGINE OVER BY HAND SEVERAL TIMES AND IF THE DOTS ARE STILL LINED UP, YOU HAVE TOP DEAD CENTER. SORRY FOR THE CAPS, MY KEYBOARD IS SCREWED UP. Sounds like you did it the wrong way hope you didn't screw anything up.

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2001 Z/28 6speed. TSP 231/237 598/595 112 cam, PRC .660 lift valve springs, titanium retainers, TSP 7.4 hardened push rods, Lid w/ Amsoil filter, Longtube headers, TSP true duels, richmond 4.10 gears, SLP maf, LS2 timing chain and gear set, Clevite rod and main bearings, ARP rod bolts, Power bond 25% UD pulley, Custom tune by RPM performance, BMR subframes, BMR LCA's, Edelbrock TQ arm, BMR panhard bar,315/35/17 MT ET streets on black ZR1's... 395 rwhp 381 rwtq

ccanterb

Ya same here, I didn't turn the engine over by hand. Would one tooth off cause p0300 random misfires? Thanks for the reply.

1NCZ28

any bit off will cause a random misfire code, hell even after a cam swap, if you have it lined up correctly, it will/should set off a random misfire code because the computer is still set for the stock cam and I beleive the computer will throw that code from to much knock as well.

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2001 Z/28 6speed. TSP 231/237 598/595 112 cam, PRC .660 lift valve springs, titanium retainers, TSP 7.4 hardened push rods, Lid w/ Amsoil filter, Longtube headers, TSP true duels, richmond 4.10 gears, SLP maf, LS2 timing chain and gear set, Clevite rod and main bearings, ARP rod bolts, Power bond 25% UD pulley, Custom tune by RPM performance, BMR subframes, BMR LCA's, Edelbrock TQ arm, BMR panhard bar,315/35/17 MT ET streets on black ZR1's... 395 rwhp 381 rwtq