engine missing big time...
Thread Starter
Staging Lane
Joined: Mar 2011
Posts: 97
Likes: 0
engine missing big time... hey guys my car has been missin real bad, it gets werse when its under load (i.e. under 1500 rpm or when you get on it) and shoots black smoke out of the exhaust. the best way to describe it would be that it stumbles and there is a big power loss. i already replaced the optispark coil control module and the plug wires are in the right order. thanks for any help!
Thread Starter
Staging Lane
Joined: Mar 2011
Posts: 97
Likes: 0
the service engine soon light cuts on and off and it doesnt seem to run better when its off but i know that i checked it one time and it did give me an o2 sensor code, even though i have them plugged up i still have lt's and can i be stupid and ask what is a ect?? hahah
TECH Regular
Joined: Dec 2011
Posts: 477
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My 93 did the same thing and it was a cracked porcelain on the number 5 plug. Obviously whoever installed it, tweaked it enough to crack it. Check to see if one of your exhaust header tubes are cooler then the others or if your still with the cast manifold soak with water one a cold start and check the plug with the last port to evaporate the water. If so, change that plug first.
Joe
Joe
http://shbox.com/1/4th_gen_tech1.html
This sight will become your best friend.
http://shbox.com/1/4th_gen_tech2.html#ect
This link has the table for checking the ECT.
This sight will become your best friend.
http://shbox.com/1/4th_gen_tech2.html#ect
This link has the table for checking the ECT.
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Staging Lane
Joined: Mar 2011
Posts: 97
Likes: 0
ok so update on the big problem, i checked all the plugs and they all seemed good except one on the passenger side which didnt have carbon on it so i replaced it and that seemed to help a little but not much, but whats weird about it is the black smoke is coming from the drivers side. so if its not a plug or a wire and ive replaced the distributor ignition control module and coil (and the mass air flow and map sensor ect for what its worth) then what could it be? injector dumping too much fuel? you tell me thanks guys
TECH Regular
Joined: Oct 2011
Posts: 407
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From: Keller Tx
I am pretty much in a similar situation. After changing plugs, O2 sensors, cleaning MAF it still runs rough. I throw the famous code Po300. Ths is only after it warms up. When cold runs great.
I will look at that water pump thing too.
I guess my question would be wouldn't it be cheaper to have the car scanned while it is running to pin point the problem? I am getting tired of tossing money at it.
I will look at that water pump thing too.
I guess my question would be wouldn't it be cheaper to have the car scanned while it is running to pin point the problem? I am getting tired of tossing money at it.
