402 install my tach doesnt work help !!!
402 install my tach doesnt work help !!! Just installed my 402 i put together, rescaled the injectors and raised the idle slightly with ls1 edit. Got the motor started and it has oil pressure... Thats the good news the bad is that it is running ungodly rich and barely idleing. Problem is that my tach is staying at 0 . I used the racetronix i believe plug and play cam wires for the ls2 block so idk if that could be the problem ? i heard that sometimes wires are on backwards ? is this true ? Any idea's would be appreciated. p.s. car is a 2000 T/A, 402 ls2 block, afr 225 heads, fast 90/90 and 42 lb injectors (lucas)
Last edited by Mrbowtie26; Nov 13, 2006 at 12:05 AM.
Sounds like the cam sensor wires, but that shouldn't happen with a PnP harness. The crank sensor should stay the same. You may need to switch the two outside wires of the cam sensor. You also need to reduce the lower VE table to help with the rich idle. Does the car backfire or pop by any chance?
Originally Posted by DrkPhx
Sounds like the cam sensor wires, but that shouldn't happen with a PnP harness. The crank sensor should stay the same. You may need to switch the two outside wires of the cam sensor. You also need to reduce the lower VE table to help with the rich idle. Does the car backfire or pop by any chance?
Check this thread, I had the same issues and it has some good info in it....
https://ls1tech.com/forums/generation-iii-internal-engine/495874-damn-ls2-cam-position-sensor.html
https://ls1tech.com/forums/generation-iii-internal-engine/495874-damn-ls2-cam-position-sensor.html
Originally Posted by Orange Peel
Check this thread, I had the same issues and it has some good info in it....
https://ls1tech.com/forums/showthread.php?t=495874
https://ls1tech.com/forums/showthread.php?t=495874
I am aware some people have had some issues with SLP motors in the past but I'm just looking for a fix at this time. Any other ideas would be appreciated.Thanks
Ron H.
Trending Topics
It is highly possible that SLP put the wrong cam sproket on or sent you the wrong one. SLP has horrible quality control. If swapping the wires dosen't work, that'll probablly be the problem.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Originally Posted by Beast96Z
It is highly possible that SLP put the wrong cam sproket on or sent you the wrong one. SLP has horrible quality control. If swapping the wires dosen't work, that'll probablly be the problem.
Thanks
Ron H.
Last edited by Mrbowtie26; Nov 13, 2006 at 09:14 PM.
Any info on how to properly diagnose if I have a problem with my cam sensor, wiring, or possibly crank sensor bad ? idk just looking for some other ideas . I'm going to go out and double check the wiring to everything and all grounds.
Thanks
Ron H.
Thanks
Ron H.
Originally Posted by 1BADAIR
are the grounds on the heads tight
or if one of them is shorted ? not sure at this point. Any help would be appreciated.
Thanks
Ron H.
Also I talked to SLP today and they said they havent had any issues with anyone getting the wrong cam sprocket with their 402 motors and had no idea what I was talking about .....they said to check all my grounds and the wires going to the cam sensor and the crank sensor.
Originally Posted by Mrbowtie26
Also I talked to SLP today and they said they havent had any issues with anyone getting the wrong cam sprocket with their 402 motors and had no idea what I was talking about .....
Originally Posted by DrkPhx
Are you getting any codes? Did you actually check the camshaft sprocket? There is very obvious difference between a LS1 (holes) and LS2 (no holes, raised bar) sprocket.
Like I said I got the block in mid 2005 so I'm not sure if It would have the 2005 or 2006 ls2 sprocket. I would assume it had the correct 2005 unless they came out with the 2006 in mid 2005 . You should be fine with either raised bar version. Mine was also dumping alot fuel when I first started. So I had to rescale the injectors, switched back to a stock heat range plug, reduced the lower VE by 5-10% and also reduced the cranking VE by 2%. That helped alot.
Originally Posted by Mrbowtie26
Just installed my 402 i put together, rescaled the injectors and raised the idle slightly with ls1 edit. Got the motor started and it has oil pressure... Thats the good news the bad is that it is running ungodly rich and barely idleing. Problem is that my tach is staying at 0 . I used the racetronix i believe plug and play cam wires for the ls2 block so idk if that could be the problem ? i heard that sometimes wires are on backwards ? is this true ? Any idea's would be appreciated. p.s. car is a 2000 T/A, 402 ls2 block, afr 225 heads, fast 90/90 and 42 lb injectors (lucas)
Do you have a build sheet and part number for the sprocket?
Follow the wires up from the cam sensor and make sure A and C get reversed and the connector is plugged in properly.
Originally Posted by DrkPhx
You should be fine with either raised bar version. Mine was also dumping alot fuel when I first started. So I had to rescale the injectors, switched back to a stock heat range plug, reduced the lower VE by 5-10% and also reduced the cranking VE by 2%. That helped alot.
https://ls1tech.com/forums/showthread.php?t=495874
I thought according to a post on this thread you needed the 2005 sprocket, as it has only 1 raised spot ? I would think the one with more raised spots would throw the sensor off ? And I did lower my Main VE from 0-1200 by 5% and it didnt do anything. so you are aware car barely can keep running even with me giving it a little throttle, and it is running richer than i have ever seen in a car by FAR the entire area stinks within about 20 seconds of raw fuel. I read in manual that if it was a problem with the crank sensor car wouldnt start at all, I think it is something to do with the cam sensor as my tach doesnt work, but not sure how to properly diagnose it at this point.
Thanks
Ron H.
Originally Posted by Katech
Do you have a build sheet and part number for the sprocket?
Follow the wires up from the cam sensor and make sure A and C get reversed and the connector is plugged in properly.
Follow the wires up from the cam sensor and make sure A and C get reversed and the connector is plugged in properly.
This is just frustrating at this point
lolAny help is appreciated.
Thanks
Ron H.
p.s. is there any way I can probe the wires while cranking the engine to see if sensor is reading the sprocket ? I know there is a way of checking it but I'm not sure how.
Originally Posted by Mrbowtie26
p.s. is there any way I can probe the wires while cranking the engine to see if sensor is reading the sprocket ? I know there is a way of checking it but I'm not sure how.
GM switched to the different cam sensor and sprocket sometime during the 2005 production year.
Try this:
1) Turn the ign ON (engine off), and using a digital multi meter (DMM) check the voltage on the ignition feed (red wire) and using a battery or chassis ground. Should be 12v or close.
2) Do the same as above except connect the DMM ground to the CMP ground wire (pink/black). Should be 12v or close.
You need to use the above to check the PCM side connector in two separate locations. First, remove the PnP harness and check the factory harness, then reinstall it and check the PnP connector (PCM side). Results should be the same. You can also try a new cam sensor.
Sounds like you have the GM manuals. If so, refer to troubleshooting & diagnosis for DTC's P0341, P0342 and P0343.