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Cold Start Random/ mult. Cyl misfire.

2.9K views 9 replies 5 participants last post by  aworldsdeath  
#1 ·
Here's the skinny, 16g 2g Eclipse, walbro 255 low press. pump, 550inj. safc, stock ignition, aftermarket wires, autolight copper plugs (i know shitty but w/e) MAF w/ side and lower honeycombs out, fidanza f/w. Whenever i start the car cold, i need to crank it like 10-15sec. before it starts, barely, usually it will pop and stall, then restart and it idle misfires really bad for like 10 sec. or untill i throw it a rev, once revs come up a little, everything smooths out, but untill the car is fully warmed up, it tries to idle like shit. the car throws a random, multi cyl.
misfire code. ANy ideas?i dont think it is MAF related because it did it before i hacked it.
 
#2 ·
Could be an air leak, or your low settings on your afc are shit. Which is now magnified by the fact you hacked it.

Get rid of the autolite plug asap.
They don't work in these cars. At all.

If you knew better, why did you do it?
 
#6 ·
I swapped plugs to the NGk's today and wow, it made a difference in my on throttle response.. boost comes up faster and it got rid of what i thought was fuel cut, but ended up being the ignition breaking up... it was blowing the spark out. So i am happy with that, but it still is a rough starting car.... It has done this since i owned it... i kinda think it could be a bad fuel pump o ring? maybe fuel pressure is bleeding off after i shut it down?
 
#7 ·
Asmodeus said:
Could be an air leak, or your low settings on your afc are shit. Which is now magnified by the fact you hacked it.

Get rid of the autolite plug asap.
They don't work in these cars. At all.
Lol I think Autolite is about the crappiest product you can put in your car. And why would you hack the MAF when the car doesn't run right!?
 
#8 ·
Fried_ride said:
I swapped plugs to the NGk's today and wow, it made a difference in my on throttle response.. boost comes up faster and it got rid of what i thought was fuel cut, but ended up being the ignition breaking up... it was blowing the spark out. So i am happy with that, but it still is a rough starting car.... It has done this since i owned it... i kinda think it could be a bad fuel pump o ring? maybe fuel pressure is bleeding off after i shut it down?

As said before recirculate your BOV. It will cause a shitty idle and stalling between shift and while coming to stops.
 
#10 ·
You may not think it's your BOV, but it most likely is. Try using different spark plug wires? Your low S-AFC settings may be out of whack as well. As for the cold start... Could once again be an issue with AFC or BOV, too much fuel when you start to crank it over.