As some of you might know,I been having a tough time getting my car to fire up after the following modification were install,
ZZP S2 cams,
Balance shaft delete kit
Ported head
Supertech valve springs kit

My car ended up at the Chevrolet dealer, they double checked my work and my timing was 2 teeth off, so they retime my timing chain but they are having a fu*** hard time clocking the cam sensor. Today they call me and they want to see my stock cams to compare to the aftermarket cams from Comp cams. So they tell me the every time they clock the cam sensor it will fire up but after more attempts it won’t fire up again until they re time the sensor again. Prior to this, they already check for an electrical issue, they also checked my fuel system and everything is good. I just hope I did not Fu** anything else.

What do you guys think?

 

they ned to put #4 piston on top dead center compression stroke and alighn the notch on the hex with the mark on the sensor case and install

 

sub'd

 

Like I told steve. They just keep getting it wrong.

 

so here is an update. dealer call me and they are saying the everytime they clock/ bolt the housing with cam sensor the car wont start. when they loose it up it will start. So they ask me for my stock cams and yhey are going to compare them to zzp's.

 

Oh man...let the $$$ bleeding begin.

 

More aggressive cam lobes should have no effect on timing marks as they generally use blanks to get that more aggressive lobe but they still have the same timing marks! It seems to me that your dealer is trying to get $$$ out of you. Good luck as it's been stated that unless #4 is at TDC then there is no chance it will time/fire correctly! I would print out the instructions given and hand them over to the dealer. As there should be no difference in timing marks!

 

If it takes more than 1 Mississippi to start, timing is wrong or the CKP sensors are busted.

Sure it might be something down the chain, but if it fired before the mods then the above is the likely culprit.

 

you need to go to a different dealer.... ive installed about 4 sets of these and NEVER had an issue. comp cams is a very good company. the reason the car wont start is because its too far out of time. the easy way to check this is unplug your cam position sensors and fire the car with just the crank position sensor plugged in... should fire right up if its out of time. more then likely and it sounds like a rookie tech is working on the car.

 

Never have a dealer install aftermarket parts half of them cant even put the correct oil in the engine.

 

there peobably isent any difference in the timing marks but the hex could have been pressed in in the wrong position

 

i think this is the problem ^. dealer call me today and they want to shoe why it wont start, they are talking about cams.....most
likely the hex pressed in wrong positio....fml

 

i asked and they say the timing is good, fuel, spark , anf compression is good. so idk.
they probably ganna want to throw stockers bak in...... at this point i already need the cat...been out for 4 months

 

I had a long start issue for about two years. It started when I got a gm stage 2 tune and swapped the ecm. At one point I checked the cam sensor. the sensor tried to rotate to the vertical position every time I attempted to reinsert it. My issue turned out to be with the tune as when I swapped to 80's and e47 the retune fixed the long start. IF you loaded in a new tune file then maybe it is messed up.

 

tuners, you guys wanna chime in this^. as i do not know about tuning.

steve, ur thoughts?

 

update. just came back from dealer and the hex of the exh. cam is pressed too far back the the camsensor hex wont reach it. ill post a pic later tonight. i hope zzp helps me out with a replacement?

 

this are ZZP Cams. see how the female HEX is too far back. So when they insert the notch from the sensor case it does not reach the female hex.

 

this is the Stock Cams. see how the female HEX is flush with the cam. so when they insert the notch from the case sensor it goes in completely.

tomorrow morning im calling ZZP so they can help me out.

 

good find man

 

Now that makes sense. I have regained some faith in your dealership lol

 

+1 on the find rudy

 

hahaha....so did i...i was loosing hope on my whole project