Birdie2000

iTrader: (15)

Car is having trouble starting. Will crank like hell, pop out the exhaust a few times, etc. Will do this for 2-3 times and then finally start up like nothing happened. Tuner says this sounds typical of cam sensor sync problems since you always have to stop cranking and turn the key again and it'll fire right up (I guess this relearns the sync or something?). Anyway, rather peculiar problem, has anyone had trouble with this before? Tune is otherwise dialed in and runs just fine.

camar0corey

iTrader: (22)

I had the opposite problem of my tune was way off so I had to play with the throttle to just keep it running. I guess I also didn't have the cam dowel tapped back far enough, and it rubbed on the housing for the cam sensor.

Before I had the motor tore down I'd have to crank for a long time before it would fire off.
Well I hope you track down your issue, at least I'm not the only person having issues since changing to the 24x system now?

merim123

iTrader: (11)

Mike does say in his instructions a couple if things to look out for in terms of having everything aligned. Also I think you need to do the crank relearn. Any codes?

BizZzatch350

iTrader: (33)

We had that problem on mine, check to see that the cam sensor is counting in the PCM. The sensor wouldn't count on mine, we unplugged it, plugged another sensor in out side of the car and waved a bolt past it while the motor was on and it counted that. We ended up modifying the sensor a little and it has worked perfect ever since. What timing cover are you using? We are using the Billet TPIS on mine.

Birdie2000

iTrader: (15)

What did you have to do to modify it?

I'm using the stock OBDII timing cover.

Also, I don't remember receiving any instructions, but I could have just misplaced them. I bought the parts separately and had my buddy who does vehicle wiring do the harness, so maybe that has something to do with that.

BizZzatch350

iTrader: (33)

Just made it sit more flush in to the timing cover, didn't take much but after that it worked fine. I am not using a GM OBD II cover though like you are.

S10Wildside

A little clarification here...

Instructions
Every 24x conversion was shipped with instructions and a troubleshooting guide. Misplaced instructions and troubleshooting guide can be requested and emailed promptly (during normal business hours).

Cam Signal Issues
The cam signal components were designed on a stock LT1 engine. So far, the only problems related to cam signal have been due to...

• some aftermarket timing sets that change the cam sprocket thickness
• DIYers who follow LS1 cam sensor schematics rather than the included pinout document for LS2/LS3 type cam sensor

I recall only one (Neil?) who had to modify the signal any other reason.

Birdie2000

iTrader: (15)

Just wanted to let everyone one know this is exactly what the problem was. My wiring guy must have gone into autopilot mode, it's just pins A & C being switched on the cam sensor which is really easy to do. Starts like a champ now.

S10Wildside

lethal bird

iTrader: (12)

I know this is an old thread but the same thing is happening to me. I have 12 volt ref as red 39 and CMP sensor signal as blue 73. Is the correct or am I backwards?

tt383lt1

iTrader: (3)

idk mine does the same thing some times. im checking this out on mine

lethal bird

iTrader: (12)

Yea mine doesn't do it every time ether just 7 out of 10 times.

tt383lt1

iTrader: (3)

yeah about the same. but it runs like a champ when it get going

95mysticta

iTrader: (4)

This is not the stuff i want to hear before i start my swap this weekend...

lethal bird

iTrader: (12)

Sorry lol i was just writing it off to the tune but it seems i'm not the only person with this problem.

SoxXpupPeT

iTrader: (34)

Not to troll but this is why i purchased the new plug-n-play harness from Mike. Couldnt be happier!

lethal bird

iTrader: (12)

but oh well it looks like it just as simple as swapping two pins.

95mysticta

iTrader: (4)

Well gregrobs harness isn't the diy so its not entirely the issue. Lethal I just checked my noted and my 12v wire and signal wire are same as yours. Does it for sure have to move those wires?

lethal bird

iTrader: (12)

Gregrods is a DIY harness he had projection put it together through if I'm not mistaken. I don't know yet if mike doesn't come in and shine some light on the subject then I plan on calling him sometime this week.

355z28

iTrader: (8)

Greg Rob was having cam sync issues as well. But it sounds like he switched 2 wires around and the problem went away from where I hear.