Ls9 cam in 4.8 throwing cam code p0341
Ls9 cam in 4.8 throwing cam code p0341 So I have a '99 4.8 that I installed an ls9 cam in with the 1x front cam gear, ls2 front cover, and sensor. First I extended the cmp sensor harness to reach the new position without switching any wires. This way, it would start up half the time but sometimes it would crank and crank and backfire but not start. This was throwing a different code (camshaft position sensor bank-A high, or something) so I switched the outside wires and it seemed to start up better but still throws the new code (p0341) and sometimes won't start when it's cold out.
Does anyone know what is causing this problem? Any help is appreciated
Thanks
Does anyone know what is causing this problem? Any help is appreciated
Thanks
TECH Enthusiast
Joined: Nov 2004
Posts: 714
Likes: 0
From: Tampa FL
So I have a '99 4.8 that I installed an ls9 cam in with the 1x front cam gear, ls2 front cover, and sensor. First I extended the cmp sensor harness to reach the new position without switching any wires. This way, it would start up half the time but sometimes it would crank and crank and backfire but not start. This was throwing a different code (camshaft position sensor bank-A high, or something) so I switched the outside wires and it seemed to start up better but still throws the new code (p0341) and sometimes won't start when it's cold out.
Does anyone know what is causing this problem? Any help is appreciated
Thanks
Does anyone know what is causing this problem? Any help is appreciated
Thanks
Sounds like tuning issue ,,,,,,,not enough fuel ,,,,,,,,if it runs too lean it can actually seize so as soon as possible I would get a tune ,,,,,,,,,,bigger cam = more air without more fuel so
The ls9 cam isn't enough to disable the drivability/ running of the engine without a tune, but yes I had a base tune and brought it to get dynod and long story short the axle I bought had a bent shaft and he couldn't properly tune it for that reason and the cam sensor problem (I hadn't switched the outside wires by that time)
Yes when it starts it runs and drives fine(and by fine I mean not perfectly but enough to go up and down the street.)
And believe me, I've searched my *** off and have found valuable info in here as well as other sources. None of which tell me why it is still throwing the code after switching the wires. I'm wondering if the newer style cam sensors are a different voltage (5v apposed to 12v)
Yes when it starts it runs and drives fine(and by fine I mean not perfectly but enough to go up and down the street.)
And believe me, I've searched my *** off and have found valuable info in here as well as other sources. None of which tell me why it is still throwing the code after switching the wires. I'm wondering if the newer style cam sensors are a different voltage (5v apposed to 12v)
So I've been reading and it seems as though the ls2 style cam sensor goes as following: A-5 volt reference B- low reference and C- CMP signal sensor. While the ls1 style is A- cmp signal sensor B- cmp sensor ground and C must be the power.. But I'm reading 12 volts on the power wire where the ls2 style says "5 volt reference".... So do I need to find a 5 volt reference to wire this to?
There was a thread in this forum maybe a year ago or so that someone said that the only difference is the 2 outside wires need switched . You do have a cam gear that has no holes in it right ? There is a difference in the cam timing gear
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I have two walbro 255 pumps and either 60lb injectors.. Don't think fuel is an issue. And yeah I have the one without the holes.. It has one "bump" that the sensor reads.
I switched the wires back to how it is supposed to be and now the car won't start at all. It was starting right up before but not anymore.
I switched the wires back to how it is supposed to be and now the car won't start at all. It was starting right up before but not anymore.
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Teching In
Joined: Aug 2025
Posts: 13
Likes: 0
From: Lafayette ga
I have kinda the same problem I don't know if I lost my tune when I changed the alternator an the battery or what mine is 6.2 LS3 I started it the first time an it had a prolonged crank an I changed the plus an wires now I have a long crank a back fire before it starts an a cam sensor code an a knock sensor code but the car runs as good as it ever has just codes an long start.mine has the 2 peace timing cover with cam sensor in it an pig tail for the sensor idk
Teching In
Joined: Aug 2025
Posts: 13
Likes: 0
From: Lafayette ga
This is what the back of the alternator looked like when I took the new one off the car an popped the plastic back cover off.that heat grid is laying on the stud an against the wired post it's not post to be there .I put the old one back on same problem they sent me a new one I haven't had time to change it back out yet.what ever it is the bad altinator caused it just don't no what
Teching In
Joined: Aug 2025
Posts: 13
Likes: 0
From: Lafayette ga
No haven't done any of that it's got to be the wire to computer that the cam sensor sends back or the computer is bad I'm gonna back probe all the wires from sensor to computer an see that's all I know to do at this point
