PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Just installed an LS2 402 and it runs rough.

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Old Feb 9, 2006 | 10:29 AM
  #21  
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Originally Posted by DrkPhx
If the wired are crossed, it will cause a backfire and pop condition similar to mismatched plug wires on a SBC.
So......should I just swap the wires and plug it in and see if the code and the snap,crackle,pop goes away? I don't want to pull the whole extension out if I can avoid it.

Also, not related to tuning and off topic but about the oil leak. I am new to the whole manual trans world so this is going to sound stupid but here goes.
When the tranny is in nuetral, does the clutch disk spin and have friction with the flywheel? I am concerned as to whether I am soaking the clutch with oil if my oil leak is coming from the oil plug in the back of the crank. Also, the tranny is very low on fluid as I have not refilled it yet due to the possibility that I will have to pull the tranny back out if the oil is coming from that oil plug in the crank.
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Old Feb 9, 2006 | 12:41 PM
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98Z - Is the wiring harness color coded?
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Old Feb 9, 2006 | 07:04 PM
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Originally Posted by hpcubed
It should run fine without the cam sensor. That only assists for quicker startups.

If you are running the maf, the computer knows how much air is coming in. Doesn't matter if its a 402, timing calculations will be off a little. Bottom line is if you open the throttle stop a little, it should idle at 1K pretty decent.
Thank you! I would just ensure that you're not running so rich that you're washing down the cylinder walls with gas. Other than that you're not gonna hurt anything on a base tune if you still have the maf. Running without a cam position sensor is not like having the distributor backwards because the pcm will figure out which stroke it's really on.
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Old Feb 10, 2006 | 12:20 AM
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Originally Posted by 98Z28CobraKiller
When the tranny is in nuetral, does the clutch disk spin and have friction with the flywheel?
Yes,when the motor is turning the flywheel,clutch disk and pressure plate is also turning at the same rpm.So is the input shaft of the trans,unless you push in the clutch.Then the input shaft and clutch disk is not spinning,but pressure plate and flwheel is.
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Old Feb 10, 2006 | 07:09 PM
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Thanks for all of the help guys. I got the wire switched around and now I can idle. Cam code is gone. I have taken her around the block a couple of times and it seems to run ok. The oil leaking seems to have worked itself out for now. I have a buyddy with a lift that is going to help me figure out the oil leak if it shows up again. I just hope that it isn't that plug in the back of the crank.

I hope to be getting the HPTuner software on the 16th or 17th if they ship on the 15th as promised. I will be giving it my best shot at an SD tune.

Question, I am getting a misfire code now but there is no misfire when I check for a misfire. What could this be? Also, aren't the rear O2's missing supposed to set a code? I am not getting a code for the missing O2's. Other than that, everything is great for still having a stock tune.
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Old Feb 10, 2006 | 08:16 PM
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Originally Posted by 98Z28CobraKiller
Thanks for all of the help guys. I got the wire switched around and now I can idle. Cam code is gone. I have taken her around the block a couple of times and it seems to run ok. The oil leaking seems to have worked itself out for now. I have a buyddy with a lift that is going to help me figure out the oil leak if it shows up again. I just hope that it isn't that plug in the back of the crank.

I hope to be getting the HPTuner software on the 16th or 17th if they ship on the 15th as promised. I will be giving it my best shot at an SD tune.

Question, I am getting a misfire code now but there is no misfire when I check for a misfire. What could this be? Also, aren't the rear O2's missing supposed to set a code? I am not getting a code for the missing O2's. Other than that, everything is great for still having a stock tune.
Glad to hear to hear that. The rear O2 code will eventually come on after a couple of drive cycles. Did you check for individual cylinder misfires with Autotap? Curious why you're going the SD route; I'm running a MAF and with more tweaking my tune should be good. Also, what are you running for a system.
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Old Feb 11, 2006 | 10:02 AM
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Originally Posted by DrkPhx
Glad to hear to hear that. The rear O2 code will eventually come on after a couple of drive cycles. Did you check for individual cylinder misfires with Autotap? Curious why you're going the SD route; I'm running a MAF and with more tweaking my tune should be good. Also, what are you running for a system.
Yeah, I think that I did it right in Autotap. I went into guages and set it to misfire by cylinder or something like that. It didn't show anything. Did I do it wrong?

Regarding SD. From all that I have read, you can get more power out and fine tune it better (in my climate). I live in South Florida so my altitude never changes (sealevel +/- 5 ft). My temp goes from 45 to 95 F. Humidity goes from 100% to 80%. But most of the year it is between 70 and 80 F. I have heard that you can really get one of these 402's tp pur.
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Old Mar 6, 2006 | 06:42 PM
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Just tried to start my LS2 last night and have very similar issues. I get only a P0343 code. I also got the LS1 -LS2 cam harness from SDPC. I called them today to see if they can verify. I traced some wires and found the following: Hope it helps.

LS1 is



The extension looks straight through

PIN A = brwn
PIN B = pnk
PIN C = red


The problem is that on the front cover where the cam sensor is is wired. (pin "A" and "C" are reversed).

PIN A = red
PIN B = pnk
PIN C = brwn
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Old Mar 6, 2006 | 06:59 PM
  #29  
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We were throwing the cam sensor code with our LS7 project. Swapped pins A and C around and it fixed the problem. I believe we were throwing a P0342.
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Old Aug 8, 2008 | 05:09 AM
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Originally Posted by 98Z28CobraKiller
Thanks for all of the help guys. I got the wire switched around and now I can idle. Cam code is gone. I have taken her around the block a couple of times and it seems to run ok. The oil leaking seems to have worked itself out for now. I have a buyddy with a lift that is going to help me figure out the oil leak if it shows up again. I just hope that it isn't that plug in the back of the crank.

I hope to be getting the HPTuner software on the 16th or 17th if they ship on the 15th as promised. I will be giving it my best shot at an SD tune.

Question, I am getting a misfire code now but there is no misfire when I check for a misfire. What could this be? Also, aren't the rear O2's missing supposed to set a code? I am not getting a code for the missing O2's. Other than that, everything is great for still having a stock tune.
No offense but the oil leak worked itself out..........
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Old Aug 8, 2008 | 05:16 AM
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damn..,... kinda old dont you think
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Old Aug 8, 2008 | 06:10 AM
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Yes, was doing a search and got carried away...hadn't noticed the date....
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Old Aug 8, 2008 | 12:46 PM
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Default Swap the pins

For some reason when they send these out they leave a pin and c pin in same location . Pop the wires out and swap a and c and ur code will go away! I am suprized u even got it to start being that way .... it put it in a hard start condition aswell . Most guys get it to turn over and just pop but never start!
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Old Aug 8, 2008 | 12:47 PM
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Default One more thing !

This being a new motor with new crank and u being a m6 car did u put in a new pilot bearing in back of the crank? They dont come with them !
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