The1TrueOutlaw
07-24-2015, 07:47 AM
I bought a 92 Stealth Base (SOHC) about a month ago and on the drive back to my house the CEL came on. It also had an intermittent bucking issue and trouble holding an idle. It would have almost no power then it suddenly catches and takes off. I checked the codes and came up with these three:
Ignition Coils
O2 Sensor
Vehicle Speed sensor
So I changed out the coils and that turned off the CEL completely and reduced the idling issue but I still have the bucking problem. Then I started search the forums and facebook group and found that these seem to be the most common causes:
Plugs
Coils
Wires
Leaking caps on the ECU
MAF Sensor
EVAP leak
TPS
Rare occasion the O2 Sensor or fuel pump.
The dealer I bought it from put in new plugs.
I have my doubts that it could be the fuel delivery as I can hear back firing on downshifting going down a hill.
As for the O2 sensor I assumed the code was being thrown by the coils not producing enough power to burn all the fuel and some was getting to the sensor. And the O2 sensor seems to be the least mentioned source of this kind of problem.
I have been trying to hold off on just replacing things part by part and I'd rather test every thing and verify that they faulty before throwing my money at a mystery. I started with cleaning the MAF sensor which helped some. Then I fogged the EVAP system and I couldn't find any leaks. Since the ECU is pretty easy to get out I pulled it and I found this:
8200
It looks to me as though the board itself may be damaged. I've seen where ninja performance can repair the ECU but I have no experience with getting ECU's worked on or whether or not this actually repairable.
The only other issue I have is a rusted out hole in my downpipe. But I haven't found anywhere that mentions exhaust leaks leading to this kind of issue. Unless maybe this could be throwing off the 02 sensor?
Any comments and knowledge you guys can provide would be much appreciated.
Ignition Coils
O2 Sensor
Vehicle Speed sensor
So I changed out the coils and that turned off the CEL completely and reduced the idling issue but I still have the bucking problem. Then I started search the forums and facebook group and found that these seem to be the most common causes:
Plugs
Coils
Wires
Leaking caps on the ECU
MAF Sensor
EVAP leak
TPS
Rare occasion the O2 Sensor or fuel pump.
The dealer I bought it from put in new plugs.
I have my doubts that it could be the fuel delivery as I can hear back firing on downshifting going down a hill.
As for the O2 sensor I assumed the code was being thrown by the coils not producing enough power to burn all the fuel and some was getting to the sensor. And the O2 sensor seems to be the least mentioned source of this kind of problem.
I have been trying to hold off on just replacing things part by part and I'd rather test every thing and verify that they faulty before throwing my money at a mystery. I started with cleaning the MAF sensor which helped some. Then I fogged the EVAP system and I couldn't find any leaks. Since the ECU is pretty easy to get out I pulled it and I found this:
8200
It looks to me as though the board itself may be damaged. I've seen where ninja performance can repair the ECU but I have no experience with getting ECU's worked on or whether or not this actually repairable.
The only other issue I have is a rusted out hole in my downpipe. But I haven't found anywhere that mentions exhaust leaks leading to this kind of issue. Unless maybe this could be throwing off the 02 sensor?
Any comments and knowledge you guys can provide would be much appreciated.