Help with Trouble Codes on '96 LT1
Thread Starter
Advanced
Joined: Jan 2003
Posts: 96
Likes: 0
From: Richmond VA
Help with Trouble Codes on '96 LT1
Scanner shows the following codes:
P1371 - "Distributorless ignition low resolution circuit"
PO174 - "Bank 2 System Too Lean"
PO151 - "Oxygen Sensor Circuit Low Voltage Bank 2 sensor 1"
'96 Vette has given me problems for a few months now. Some days runs fine, others the engine cuts off in traffic for no reason. Has not thrown code before now.
Fuel pump nearly new. Opti-spark, new plugs & wires about a year ago. All wires/connections checked about two months ago with stalls and occasional rough running started.
Now these codes -- FINALLY! What do they point to?
P1371 - "Distributorless ignition low resolution circuit"
PO174 - "Bank 2 System Too Lean"
PO151 - "Oxygen Sensor Circuit Low Voltage Bank 2 sensor 1"
'96 Vette has given me problems for a few months now. Some days runs fine, others the engine cuts off in traffic for no reason. Has not thrown code before now.
Fuel pump nearly new. Opti-spark, new plugs & wires about a year ago. All wires/connections checked about two months ago with stalls and occasional rough running started.
Now these codes -- FINALLY! What do they point to?
Race Director
Joined: Mar 2015
Posts: 15,926
Likes: 579
I would clean and check connections again and blow smoke in the vacumme system to find vacumme leaks. clean throttle body and iac. maybe have your coil and icm tested. clean and check connections and ground on the icm.
Last edited by antfarmer2; Feb 3, 2016 at 01:24 PM.
Thread Starter
Advanced
Joined: Jan 2003
Posts: 96
Likes: 0
From: Richmond VA
But thanks-- I'm looking for things to check and I appreciate your input.
Safety Car
Joined: Sep 2010
Posts: 3,752
Likes: 190
From: Indiana PA
Can your scanner show live data?
What is the 02 sensor reading? At idle, cruise, on the throttle but NOT WOT. Does it switch rich to lean? How fast?
It is VERY plausible that the car is running lean and throwing the Lean code AND the Opti-Spark code. Think about what is happening. It only sees the Low resolution signal so often so if the car is cutting out.....it may not see it enough and throw the code.
To test the 02, you can create a lean condition (if it is not already) or a rich condition. Propane or some carb cleaner shot into the intake will do this. FYI, you need a propane injector tool or you will NOT get enough flow from a can of it to effect the engine. A blow torch unlit is NOT enough. Do this BEFORE the MAF sensor.
You can clean crap and **** around with it or you can actually diagnose it.
A lean condition can be caused by a vacuum leak but don't you want to see if your adjustment tool (02 sensor) for your a/f ratio is working?
You should also test the MAF sensor as well. What are its readings at idle, wot? In g/sec and voltage helps. Even better if its in Hz. Has it been cleaned? Is it contaminated?
What is the 02 sensor reading? At idle, cruise, on the throttle but NOT WOT. Does it switch rich to lean? How fast?
It is VERY plausible that the car is running lean and throwing the Lean code AND the Opti-Spark code. Think about what is happening. It only sees the Low resolution signal so often so if the car is cutting out.....it may not see it enough and throw the code.
To test the 02, you can create a lean condition (if it is not already) or a rich condition. Propane or some carb cleaner shot into the intake will do this. FYI, you need a propane injector tool or you will NOT get enough flow from a can of it to effect the engine. A blow torch unlit is NOT enough. Do this BEFORE the MAF sensor.
You can clean crap and **** around with it or you can actually diagnose it.
A lean condition can be caused by a vacuum leak but don't you want to see if your adjustment tool (02 sensor) for your a/f ratio is working?
You should also test the MAF sensor as well. What are its readings at idle, wot? In g/sec and voltage helps. Even better if its in Hz. Has it been cleaned? Is it contaminated?
Last edited by 93Rubie; Feb 3, 2016 at 04:52 PM.
Thread Starter
Advanced
Joined: Jan 2003
Posts: 96
Likes: 0
From: Richmond VA
All good ideas. My scanner only works with the ignition on, but engine not running. So I'm limited in some of these tests. May have to take this to the shop and see what they can find.
Thanks for your suggestions.
Thanks for your suggestions.
