Helping a friend to modify his car. It's 1995 M6 camaro. We installed EX 224/230 cam with ex 612 valve springs, 1.6 self-adjusting rockers, and hooker LT's with hooker catback, gutted cat. The cam was installed correctly 100%- matched dots and checked that when the #1 cylinder was TDC the cam pin was at 3 o'clock. I also opened the opti and cleaned it with electrical cleaner/lubricant that comes in a spray can, and reassembled it. Also I used the same cleaner to spray the MAF sensor.
When I start the car, it starts and dies after two second. When it starts, the RPM's jump to 2k. By having my friend to start the car for about 10 times, I managed to adjust all the rockers, so rockers are fine. All injectors and wires are connected correctly, triple checked it. The car does run with gas by keeping RPM's above 2.5k, but very ruff. No SES lights. I am assuming that the problems could be in the following- opti, MAF sensor, stock ECM file, or the knock sensor is picking up too much knocking. If somebody (knows where to get) has an ECM tune for EX 612 (cc 305), could you email it to samotlietuvis@hotmail.com, thanks a lot.
Anything else could be causing this kind of behavior? I tried running Datamaster software, but it does not work- cannot establish connection, even though it passes connection test

Thanks,
Tomas

 

sounds like its just the stock tune, i had to get a mail order tune until the weather gets nice here. makes a world of difference though! your going to have that problem until you get that changed, specially switching cams and everything.

 

i installed the same cam in my camaro last spring, with jet hot long tubes and when i first start it, i have to blip the gas pedal until it fires and baby it like its an old carburated POS for about 2-3 minutes and then it will run on its own. the guy at my local dyno shop told me that it is because of the stock computer tuning.

 

As sensitive as the opti is I would never open it and clean anything.Seeing as how a small amount of coolant will kill that thing, are you 100 % sure you didn't do something to it that you shouldn't have?

 

I would have to agree on the cleaning,
It kinda worries me......Try unhooking the MAF and see how it does. Make sure all coneectors are done good, Wires on the right plugs.....
Did you lengthen the O2 wires?
Make sure those are crossed and done wrong
I have run my 224/230 cam with stock tune several times and couldnt tell a difference so I doubt its the tune, But every car is different

 

When i initially installed my cam, AND when i rebuitl my engine both times - on initial start up it ran like crap for about 2-3 minutes, REALLY rough. Then all of a sudden it's like the computer "figurest hings out" and it immediately goes to a normal idle and is fine thereafter. Funny thing is even after i reset the pcm it immeidately runs fine. I never figured out why that is - unhooking the MAF didn't really help. At any rate i would let it run a little bit and see what happens.

 

Sounds like what my motor did when the locks pulled through due to improper size and smashed my valves.

Actually dot to dot is #6 TDC, but whatever, doesnt matter really as long as the pin was at 3oclock.

Any odd noises first time you tried to start it?

 

I have taken my opti apart multiple times without issue...one time to actually clean water out of it since car wouldn't run. AFterwards it functioned fine. It tends to get carbon buildup, after cleaning car ran better in fact. As long as you don't bend the optical wheel etc. there doesn't seem to be much risk IMO in taking apart the opti.

 

I have done some some dumb stuff so I leave well enough alone. Besides with all the work involved to get it all apart you may as well replace it. If you don't seal it properly it can be a HUGE headache. Certainly not a half hour job and you know when it would give you troubles. When you are in a hurry or way far from home, it will go to hell. Oh, yes, it will. Its that damn Murphy's Law, not mine

 

Well car started. We were finishing the car late last night, and forgot to connect 2 vacuum hoses from intake. Also I changed MAF, had spare one lying around. And at the same time I uploaded my cc306 ECM tune. I don't know which of these things did it, but the car runs now. It smokes white a lot though, probably computer is still learning the tune, or bosh heated oxygen sensors are POS'es. Also, for some reason my laptop cannot connect to ECM, but my desktop did, kind of pain to get it to garage. EX 224/230 cam sounds mean, but it looks like car needs some more tuning.
Never cleaned the opti before, but since it was not mine, I took part in it . I like seeing what's inside.
Car still needs a tune, or maybe its cold weather. The smoking looks exsessive. Still looking for a tune

 

when cam pin is at 3 o'clock and dots align, you have both number #6 and #1 cylinder at TDC

 

I even took off the optical wheel with another disk, and unscrewed two torx screws to get to the rotating assembly of the opti. Then I cleaned and lubricated it. When I assembled the opti back, it turned much easier than before, and the spray I used was electrical cleaner. Hardest part in taking the opti apart was braking the screw when opening the opti and then drilling them out , real pain. Another misengineering from GM using such thin screw to hold the opti together. Time will tell how good was my job

 

it was ur maf....

ran into a similar problem after my turbo install... had to dirve it for 2 miles to get some wires to extend the maf wires...

it would die if i didnt give it gas...

if ur locks were improper size and it came off like atjlar said, then u woulda been in trouble heh

 

No actually you dont. TDC refers to the piston at the top of the compression stroke. Just because both pistons are up, doesnt mean you are at TDC.

Anyways glad you got it running.

 

Yup, both times i've took mine apart i did that as well