Help (uk)
Thread Starter
Heel & Toe
Joined: Oct 2018
Posts: 16
Likes: 1
Help (uk)
Hi guys,
So I have a 2001 C5 Z06 and currently have installed LG PRO headers with cats and Bullet's mufflers. Now I have blanked out the rear 02 sensor locations and have moved the rear sensors to the front location and have 1000% run right sensor to the right and left sensor to the left. The car ran rubbish initially and I found out that the new plugs that where sent to me where the wrong ones so I had to put my old plugs back in after that car ran fine for the whole day drove it for about 100 miles and never skipped a beat including the run to work But 1 spark plug was cracked ever so slightly.
Now on the way home yesterday my car started to run rough again literally misfiring and my fuel gauge you could see it moving like the engine was just dumping fuel in the car. I have ordered new spark plugs to see if it is that is causing the problem but I think I got the code for (Slow response for both front 02 sensors & insufficient switching for both rear 02 sensors) obviously the rear 02 sensor is understandable as I don't have them in there. Is there anything else that I can check on the car OH BY THE WAY NO TUNE YET, but I would of thought and reading many posts that the car would run okay just to plod around until I got my tune sorted as surely I cant send it to be tuned like this it wont go above 2k rpm without misfiring.
Would the PCM dump that much fuel into the cylinder causing it too misfire and pool the spark plugs if the 02 sensors are slow responding.
Other Mods for the car:
So I have a 2001 C5 Z06 and currently have installed LG PRO headers with cats and Bullet's mufflers. Now I have blanked out the rear 02 sensor locations and have moved the rear sensors to the front location and have 1000% run right sensor to the right and left sensor to the left. The car ran rubbish initially and I found out that the new plugs that where sent to me where the wrong ones so I had to put my old plugs back in after that car ran fine for the whole day drove it for about 100 miles and never skipped a beat including the run to work But 1 spark plug was cracked ever so slightly.
Now on the way home yesterday my car started to run rough again literally misfiring and my fuel gauge you could see it moving like the engine was just dumping fuel in the car. I have ordered new spark plugs to see if it is that is causing the problem but I think I got the code for (Slow response for both front 02 sensors & insufficient switching for both rear 02 sensors) obviously the rear 02 sensor is understandable as I don't have them in there. Is there anything else that I can check on the car OH BY THE WAY NO TUNE YET, but I would of thought and reading many posts that the car would run okay just to plod around until I got my tune sorted as surely I cant send it to be tuned like this it wont go above 2k rpm without misfiring.
Would the PCM dump that much fuel into the cylinder causing it too misfire and pool the spark plugs if the 02 sensors are slow responding.
Other Mods for the car:
- Mcleod RST clutch & steel flywheel
- MSD wires installed with headers.
- Titanium spark plug heat shields.
- Remflex headers gasket.
- Honker intake
- rocker trunion kit.
Last edited by Kellnerz06; Oct 3, 2018 at 11:30 AM.
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Burning Brakes
Joined: May 2016
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From: Port Charlotte Florida
Hi guys,
So I have a 2001 C5 Z06 and currently have installed LG PRO headers with cats and Bullet's mufflers. Now I have blanked out the rear 02 sensor locations and have moved the rear sensors to the front location and have 1000% run right sensor to the right and left sensor to the left. The car ran rubbish initially and I found out that the new plugs that where sent to me where the wrong ones so I had to put my old plugs back in after that car ran fine for the whole day drove it for about 100 miles and never skipped a beat including the run to work But 1 spark plug was cracked ever so slightly.
Now on the way home yesterday my car started to run rough again literally misfiring and my fuel gauge you could see it moving like the engine was just dumping fuel in the car. I have ordered new spark plugs to see if it is that is causing the problem but I think I got the code for (Slow response for both front 02 sensors & insufficient switching for both rear 02 sensors) obviously the rear 02 sensor is understandable as I don't have them in there. Is there anything else that I can check on the car OH BY THE WAY NO TUNE YET, but I would of thought and reading many posts that the car would run okay just to plod around until I got my tune sorted as surely I cant send it to be tuned like this it wont go above 2k rpm without misfiring.
Would the PCM dump that much fuel into the cylinder causing it too misfire and pool the spark plugs if the 02 sensors are slow responding.
Other Mods for the car:
Mcleod RST clutch & steel flywheel
Honker intake
rocker trunion kit.
Any help or advice would be greatly appreciated. Josh
So I have a 2001 C5 Z06 and currently have installed LG PRO headers with cats and Bullet's mufflers. Now I have blanked out the rear 02 sensor locations and have moved the rear sensors to the front location and have 1000% run right sensor to the right and left sensor to the left. The car ran rubbish initially and I found out that the new plugs that where sent to me where the wrong ones so I had to put my old plugs back in after that car ran fine for the whole day drove it for about 100 miles and never skipped a beat including the run to work But 1 spark plug was cracked ever so slightly.
Now on the way home yesterday my car started to run rough again literally misfiring and my fuel gauge you could see it moving like the engine was just dumping fuel in the car. I have ordered new spark plugs to see if it is that is causing the problem but I think I got the code for (Slow response for both front 02 sensors & insufficient switching for both rear 02 sensors) obviously the rear 02 sensor is understandable as I don't have them in there. Is there anything else that I can check on the car OH BY THE WAY NO TUNE YET, but I would of thought and reading many posts that the car would run okay just to plod around until I got my tune sorted as surely I cant send it to be tuned like this it wont go above 2k rpm without misfiring.
Would the PCM dump that much fuel into the cylinder causing it too misfire and pool the spark plugs if the 02 sensors are slow responding.
Other Mods for the car:
Mcleod RST clutch & steel flywheel
Honker intake
rocker trunion kit.
Any help or advice would be greatly appreciated. Josh
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,319
Likes: 3,927
From: Cape Coral, Florida
Hi guys,
So I have a 2001 C5 Z06 and currently have installed LG PRO headers with cats and Bullet's mufflers. Now I have blanked out the rear 02 sensor locations and have moved the rear sensors to the front location and have 1000% run right sensor to the right and left sensor to the left. The car ran rubbish initially and I found out that the new plugs that where sent to me where the wrong ones so I had to put my old plugs back in after that car ran fine for the whole day drove it for about 100 miles and never skipped a beat including the run to work But 1 spark plug was cracked ever so slightly.
Now on the way home yesterday my car started to run rough again literally misfiring and my fuel gauge you could see it moving like the engine was just dumping fuel in the car. I have ordered new spark plugs to see if it is that is causing the problem but I think I got the code for (Slow response for both front 02 sensors & insufficient switching for both rear 02 sensors) obviously the rear 02 sensor is understandable as I don't have them in there. Is there anything else that I can check on the car OH BY THE WAY NO TUNE YET, but I would of thought and reading many posts that the car would run okay just to plod around until I got my tune sorted as surely I cant send it to be tuned like this it wont go above 2k rpm without misfiring.
Would the PCM dump that much fuel into the cylinder causing it too misfire and pool the spark plugs if the 02 sensors are slow responding.
Other Mods for the car:
Mcleod RST clutch & steel flywheel
Honker intake
rocker trunion kit.
Any help or advice would be greatly appreciated. Josh
So I have a 2001 C5 Z06 and currently have installed LG PRO headers with cats and Bullet's mufflers. Now I have blanked out the rear 02 sensor locations and have moved the rear sensors to the front location and have 1000% run right sensor to the right and left sensor to the left. The car ran rubbish initially and I found out that the new plugs that where sent to me where the wrong ones so I had to put my old plugs back in after that car ran fine for the whole day drove it for about 100 miles and never skipped a beat including the run to work But 1 spark plug was cracked ever so slightly.
Now on the way home yesterday my car started to run rough again literally misfiring and my fuel gauge you could see it moving like the engine was just dumping fuel in the car. I have ordered new spark plugs to see if it is that is causing the problem but I think I got the code for (Slow response for both front 02 sensors & insufficient switching for both rear 02 sensors) obviously the rear 02 sensor is understandable as I don't have them in there. Is there anything else that I can check on the car OH BY THE WAY NO TUNE YET, but I would of thought and reading many posts that the car would run okay just to plod around until I got my tune sorted as surely I cant send it to be tuned like this it wont go above 2k rpm without misfiring.
Would the PCM dump that much fuel into the cylinder causing it too misfire and pool the spark plugs if the 02 sensors are slow responding.
Other Mods for the car:
Mcleod RST clutch & steel flywheel
Honker intake
rocker trunion kit.
Any help or advice would be greatly appreciated. Josh
The cracked plug is causing the misfire and I'd check the others...might be more than one cracked. Many here have O2 and wiring issues after installing headers...you couldn't pay me enough to install headers on my '01 !!!...stock exhausts flow well enough for me thank you !!... Throwing a scan tool on the car would really be the only way to see how much or how little fuel the PCM is commanding and also check O2 function. If the O2's see a rich condition the PCM will take away fuel. A lean condition is the most common cause of a misfire. Get the plugs changed and take it to a competent tuner and see what happens.
Melting Slicks
Joined: Feb 2001
Posts: 2,791
Likes: 355
From: Northville, MI
Here are a few, of many, suggestions: first, replace all the spark plugs and wires, then find someone with scanning/tunning software, next using your cars DIC download all the codes that are shown, use the Forum "Search this Thread", make sure you have driven the car at least around the block to do this. Separate the codes into two categories that one for H and one for HC or C codes. The tuner should give you some preliminary corrections to program into the car. After that he should send you on a 20 mile/23km run using the GM tuning procedure. From that data he should be able to use that data to program a great tune that you will be very happy with.
Last edited by Gordy M; Oct 3, 2018 at 09:57 AM. Reason: wrong word
Thread Starter
Heel & Toe
Joined: Oct 2018
Posts: 16
Likes: 1
Hi Guys,
Thanks for the advice just thought a simple exhaust swap wouldn't cause that many issues as the amount of people running them with no problems but suppose for you guys over in the US you have the places and the help needed to rectify these issues. Few and far between over here.
So car has got new plugs in and I've even done a compression test on all cylinders just in case. My friend has lent me his TECH 2 so will run the car and see what codes im getting at the moment car is running fine but need to drive it for a bit see if she starts to give me the issue again because it always seems to be the problems arise after the car has been driven. Im hoping to get the car in to be tuned just worried that even they wont be able to sort out this issue.
Again thank you everyone for your advice will keep you updated to what the verdict is.
Josh.
Thanks for the advice just thought a simple exhaust swap wouldn't cause that many issues as the amount of people running them with no problems but suppose for you guys over in the US you have the places and the help needed to rectify these issues. Few and far between over here.
So car has got new plugs in and I've even done a compression test on all cylinders just in case. My friend has lent me his TECH 2 so will run the car and see what codes im getting at the moment car is running fine but need to drive it for a bit see if she starts to give me the issue again because it always seems to be the problems arise after the car has been driven. Im hoping to get the car in to be tuned just worried that even they wont be able to sort out this issue.
Again thank you everyone for your advice will keep you updated to what the verdict is.
Josh.
Thread Starter
Heel & Toe
Joined: Oct 2018
Posts: 16
Likes: 1
Really!!!!
So.......
I have had an email back from LG saying that "C5Z06 use the front 02 sensors in the front location and only the base model of the C5 are suppose to use the rear sensors in the front location" I'm even more confused now one minute they are saying use the rear's and now they are saying use the front 02 sensors in the front location. But I wasn't sent any extensions for the front wires only for the rear 02 sensors.
Car ran fine yesterday but again won't know until I take it out again today and see what happens this is becoming tedious.
Josh
I have had an email back from LG saying that "C5Z06 use the front 02 sensors in the front location and only the base model of the C5 are suppose to use the rear sensors in the front location" I'm even more confused now one minute they are saying use the rear's and now they are saying use the front 02 sensors in the front location. But I wasn't sent any extensions for the front wires only for the rear 02 sensors.
Car ran fine yesterday but again won't know until I take it out again today and see what happens this is becoming tedious.
Josh
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Thread Starter
Heel & Toe
Joined: Oct 2018
Posts: 16
Likes: 1
So.......
I have had an email back from LG now saying "C5Z06 use the front sensors in the front location its only the base model of the C5 that use the rear 02 sensors in the front location" Im even more confused now one minute they are saying I should only be using the 2 rear 02's in the front location and now saying no it should be the front sensors.
Issue is now the extensions I got sent where for the rear 02 sensors and not the front so there is no way my front 02s will reach the connectors to plug into. Will wait for an update from LG, car ran good yesterday will test drive it again today and see what it drives like.
I have had an email back from LG now saying "C5Z06 use the front sensors in the front location its only the base model of the C5 that use the rear 02 sensors in the front location" Im even more confused now one minute they are saying I should only be using the 2 rear 02's in the front location and now saying no it should be the front sensors.
Issue is now the extensions I got sent where for the rear 02 sensors and not the front so there is no way my front 02s will reach the connectors to plug into. Will wait for an update from LG, car ran good yesterday will test drive it again today and see what it drives like.
Thread Starter
Heel & Toe
Joined: Oct 2018
Posts: 16
Likes: 1
Le Mans Master
Joined: Sep 2014
Posts: 5,278
Likes: 539
From: Kelowna BC
My memory tells me that the wire coming from the PS goes to the DS and vice versa. They go straight (O2 bungs point to opposite sides of car, to where the wires should come from), not turning back. And getting the O2 sensors crossed would give horrible running conditions.
Thread Starter
Heel & Toe
Joined: Oct 2018
Posts: 16
Likes: 1
If I can get some pics and post them up I'll try and get them.
Thread Starter
Heel & Toe
Joined: Oct 2018
Posts: 16
Likes: 1
Success
So 
Update: the car is running back as it should I had a Tech 2 borrowed from a friend and went onto fuel Trim and clicked reset and enable fuel trim learn then ran the car for a while and been test driving it for the past couple of days. Car is running good and the only code I got this morning on the way to work was (Below)
P0140 Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 1 Sensor 2 - Not running Rear 02's
P0160 Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 2 Sensor 2 - Not running Rear 02's
P0153 Heated Oxygen Sensor (HO2S) Slow Response Bank 2 Sensor 1 (Was a bit cold this morning so maybe that was an issue as code didn't come up yesterday)
So Lg have sent me front 02 extensions so when they arrive will run the front 02's in the front and the rear's in the rear and see how we go, but I do think the culprit of the poor running was that cracked plug which was causing unburnt fuel to go down the pipe and foul the sensors out causing the codes. Fair play to LG for standing by their product and helping to resolve the issue.
Thanks everyone for the help and advice greatly appreciated.
Update: the car is running back as it should I had a Tech 2 borrowed from a friend and went onto fuel Trim and clicked reset and enable fuel trim learn then ran the car for a while and been test driving it for the past couple of days. Car is running good and the only code I got this morning on the way to work was (Below)
P0140 Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 1 Sensor 2 - Not running Rear 02's
P0160 Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 2 Sensor 2 - Not running Rear 02's
P0153 Heated Oxygen Sensor (HO2S) Slow Response Bank 2 Sensor 1 (Was a bit cold this morning so maybe that was an issue as code didn't come up yesterday)
So Lg have sent me front 02 extensions so when they arrive will run the front 02's in the front and the rear's in the rear and see how we go, but I do think the culprit of the poor running was that cracked plug which was causing unburnt fuel to go down the pipe and foul the sensors out causing the codes. Fair play to LG for standing by their product and helping to resolve the issue.
Thanks everyone for the help and advice greatly appreciated.