SES Code Help????
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TECH Senior Member
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From: Schaumburg, IL
SES Code Help???? I recently helped Mark with a Head, Cam and Intake mod. We seem to be getting the following codes:
P0300 - Engine Misfire Detected (Quite often ~ 9 logs so far)
P0135 - HO2S Heater Performance Bank 1 Sensor 1 (Once)
P0155 - HO2S Heater Performance Bank 2 Sensor 1 (Once)
Any insite on what is happening?? The last freeze frame from A-tap said the misfire occured on cyl 6.
Here is the post on what was done to the car. Project is Complete!
Have dialed in the car with Autotap and a MAFT, and the LFT's and O2 readings were within the acceptable range. There is no KR either. I am at a loss here. I also want to add that while removing the plug wires one broke, <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> a Taylor 8mm. So as a temporary fix we got a used MSD 8.5 mm from Speed Inc. (THANKS) That wire is on plug no. 8.
Thanks in advance for all your insite!
P0300 - Engine Misfire Detected (Quite often ~ 9 logs so far)
P0135 - HO2S Heater Performance Bank 1 Sensor 1 (Once)
P0155 - HO2S Heater Performance Bank 2 Sensor 1 (Once)
Any insite on what is happening?? The last freeze frame from A-tap said the misfire occured on cyl 6.
Here is the post on what was done to the car. Project is Complete!
Have dialed in the car with Autotap and a MAFT, and the LFT's and O2 readings were within the acceptable range. There is no KR either. I am at a loss here. I also want to add that while removing the plug wires one broke, <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> a Taylor 8mm. So as a temporary fix we got a used MSD 8.5 mm from Speed Inc. (THANKS) That wire is on plug no. 8.
Thanks in advance for all your insite!
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From: College Station, Tx
Re: SES Code Help???? Clear the codes and see if they come back. The misfire code is either a product of the camshaft (what size is it?) or evidence of a bad plug/wire.
What cylinder's were the misfires on - all on 6? Just once? If they are all/most on one cylinder change the plug for that cylinder (wire also - or swap wire with another cylinder and see what the code does).
If the O2 codes come back swap your O2 banks (left to right, right to left) and see if it follows the O2 or stays on the side. If it follows the O2 get new ones, if it stays on the side sounds almost like a wiring issue - check for burnt/melted wires.
Chris
What cylinder's were the misfires on - all on 6? Just once? If they are all/most on one cylinder change the plug for that cylinder (wire also - or swap wire with another cylinder and see what the code does).
If the O2 codes come back swap your O2 banks (left to right, right to left) and see if it follows the O2 or stays on the side. If it follows the O2 get new ones, if it stays on the side sounds almost like a wiring issue - check for burnt/melted wires.
Chris
Thread Starter
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From: Schaumburg, IL
Re: SES Code Help???? Yes the P0300 codes have been cleared three times now and keep coming back. Last time I hooked up Atap, it had logged the code 6 or 7 times, in only a couple days of driving.
The P0135 and P0155, have only popped up two times.
Here are the mods.
ARE Stage 1 heads
Thunder Racing Cam: 224-224/.561-.561/114
Comp 918 springs
Hardened 7.35" pushrods
LS6 intake
ASP crank pulley
So far I unfortunately only looked at one freeze frame for which cylinder was misfiring. I was used to my 98 Lumina, where it has a code for each cylinder. Cylinder 6 showed misfire, I was expecting no. 8 since it is the one with the odd wire.
Could the ASP pulley be causing the misfire??
As for the O2 sensors, how would swapping them change anything?? I got a code on both sides.
The P0135 and P0155, have only popped up two times.
Here are the mods.
ARE Stage 1 heads
Thunder Racing Cam: 224-224/.561-.561/114
Comp 918 springs
Hardened 7.35" pushrods
LS6 intake
ASP crank pulley
So far I unfortunately only looked at one freeze frame for which cylinder was misfiring. I was used to my 98 Lumina, where it has a code for each cylinder. Cylinder 6 showed misfire, I was expecting no. 8 since it is the one with the odd wire.
Could the ASP pulley be causing the misfire??
As for the O2 sensors, how would swapping them change anything?? I got a code on both sides.
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Joined: Nov 2001
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From: College Station, Tx
Re: SES Code Help???? Gotcah, I was reading that backwards for a second as B1S2. You might check your fuses to make sure the O2 heater circuit fuse hasn't blown - or a wire isn't frayed.
Re: the misfire code - it may just be the camshaft causing it - especially if it isn' occuring very often.
Chris
Re: the misfire code - it may just be the camshaft causing it - especially if it isn' occuring very often.
Chris
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Joined: Nov 2001
Posts: 499
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From: Clarkston
Re: SES Code Help???? If your fuse is good, check for a loose or disconnected ground strap on the back of the driver's cyl head. There are 3 ground straps back there and one is for the heated O2's.
Those codes take 2 cycles to return so they won't come back right away.
Mark
Those codes take 2 cycles to return so they won't come back right away.
Mark
