my 85 z28 tpi is misfiring.

I did new plugs, new rotor, new wires, and cap. it was misfiring before all this and it continues

I hooked up a timing light and it flashes very Socratic. kinda like morse code .

am i safe to assume that the plug(s) is not getting spark all the time and the gas is just running through the exhaust?

if it was the coil, it probably wouldn't start right.

along with this the cars exhaust has a very strong gassy smell to it.

i did maf sensor, new tps, fuel filter, o2 sensor, swapped the throttle body

i tried to check timing but too much rust to tell any thing


im at the point where im about to blow this f-ing thing up
and buy one that runs right.

any ideas would be great.

also i did not see any traces of arcing in the cap.

 

EGR?

 

would that cause a misfire?

 

well since I have been out of the loop of my third gen, I've been driving OBDII, hook up a scanner and it confesses its sins, I am not sure now, but I just googled "EGR misfire" and most likely it can.... I remember having a problem with my EGR being plugged with all this crap... it was thick... I just replaced it and cleared the EGR ports on the manifold with some carb cleaner... don't remember having any more problems...

 

Most coil failures appear as RPM and LOAD increases.
It sounds as though you might have a bad timing chain. Put the timing light on it and have someone rap the throttle back. as RPM increases the timing flashes should quit jumping around. this is due to the acceleration of the crank pulling the chain slack out from between the crank and cam gear. (with ESC disconnected)
Another way to check the slack in your timing chain is to turn the engine over by hand until you pass the timing marks. turn it backward till you line up with zero degrees. pull the dist. cap and have someone watch the rotor as you slowly turn the engine over by hand. stop when the rotor begins to move and see what the reading is on the timing marks. That's how many degrees of slack there are in your timing chain. (easier with plugs removed)
Could also be a bad pickup coil (do a ohms test) or worn distributor bushings (visual inspection to see if the reluctor ring hits the pickup coil) or a bad ign or ESC module. I'm not that familiar with the 85 CPI so all these may not apply to your setup.
Other things that are less likely are a sticking or burned valve (do a vacuum test.) or a bad lifter, (you should hear tappet noise, Lifter rattle or clicking whatever term you like at Idle)
I'm sure others will have more ideas for you. Don't give up!!

 

oh what about when you turn your car off, does it seem like it wants to keep going? if it does, then definitely it's your chain...

 

nope, it shuts right down.

 

what about a bad injector? have you isolated which cyl is misfiring?check resistance or move injector to another cyl to see if miss follows injector.

 

I'd rather buy a probe that detects the pulse of the injector than to pull the injectors... that would be time consuming, at least that's my opinion or as I like to call it my bucket of pennies....

 

Check your distributor very closely for slop in the shaft, loose ground connection, firing order, cuts or holes in plug wires, and that the distributor itself is tightened down.
Clean off your damper, unhook the EST connector and check the timing again.

Check for vacuum leaks, and especially for fuel leaking from the regulator to the plenum via the vacuum line.