random misfire

[singlecamslam]

95 stock auto s14 just developed a misfire. Its random i know this because when i hook up a timing light the spark goes nuts, on any cylinder. What i tried so far:
new cap rotor
different distributor
timing is fine
wires are fine

The misfire is very random, car will run good than it will start acting up and wont stop for a while. Any ideas?

[Kingtal0n]

put the interior back in it...

haha. ok so, a misfire huh. Lets see. You need to figure out which cylinder(s). It is probably just one cylinder. Which narrows down your search quite a bit.

could just be a spark plug.

[singlecamslam]

I stated that the misfire is random, meaning in all cylinders, i hooked up a timing light to each cylinder and the light goes crazy, meaning the spark is very inconsistant.

[Kingtal0n]

check your computer (plug/wiring/tightness of bolt) check your grounds. Replace the computer.

could be related to, the distributor, grounds, computer, wiring.

Or you have managed to use the wrong brand(type of) spark plug / wire.

[singlecamslam]

Alright, Tried a different ecu no luck. Cleaned the MAF same issue. Plugs and wires are fine. Anymore ideas? The car is 100% stock, i'll be looking at the grounds next, as far as i know theres not that many. Its very random and comes and goes. Mostly misfires though fouling the plugs right away..

[eek]

What type of plugs are you running? Gapped correctly? You sure your knock sensor isn't going bad? Pretty common on these old cars for the knock to go bad.

[singlecamslam]

Tried a different knock sensor today, pain in the ass work for nothing same problem. Going to try some new plugs. Throw some idea out.

[eek]

Main causes of engine misfires - loss of spark, unbalanced air/fuel ratio, faulty fuel injector and a loss of compression.

I'm not trying to have you just change random parts, have you tried checking to see if your ecu is throwing any codes?

I had the similar weird issue on a bone stock 98 ka24de. Car drove fine but kept throwing misfire cel code. I brought it to several shops and even 2 different dealerships. They could not figure out what was wrong. After 3 months for my unique situation the CEL just went away and never came back.

Shit plugs can cause misfires (hopefully its not like bosch +4 plugs). Test the injectors, run a fuel injector cleaner.

[Driftwire]

Are you using BKR6E plugs