DerickTurner57

I built my 95 Z28...Bored the block .030 over..Jus a master rebuild kit no special pistons ore forged internals or any thing..Pacesetter Long tube headers..Ported Stock heads and intake...MSD cap and rotor..LT4 Hotcam and 1.6 Rockers...Rebuilt and mildly upgraded 4L60E...Bottom end was rebuilt by machine shop.

This is my 2nd 4th Gen but first 4th Gen rebuild..I installed parts to spec as described By All-Data Vehicle Information retrieval System..At first start (before connection coil wire)
I cranked the car for several seconds to build oil pressure. Fine.
Then I connect coil and cranked within the first few revolution it made a non frightening pop noise..Then a small amount light fog like smoke spit out the throttle body..

I put the engine(#1) on TDC...The crank timing gear facing 12 and can timing gear facing 6.

The valves are adjusted to proper lash..I have spark and Fuel..
Any suggestions to what might be wrong..Oh and the alternator is not connected..

cprmn14

I had the same problem, turned out my opti was not in correctly. If your timing is correct on your timing gears im betting your problem lies in the opti. Or could be crossed plug wires.

cprmn14

Btw, welcome to ls1tech!

DerickTurner57

Thanks I appreciate that....A Guy was telling me how you can position the options in 3 ways...after I get #1 back on TDC and my timing marks lined up last time my opti was pointing to 3oclock...where shuld it be facing??

shbox

3 ways? But only one is correct. Where things are pointing depends on your vantage point (looking at the back or at the dowel pin...). There is only one thing you need to know and that is that the special slot goes over the dowel pin.

I'll wager you have the opti on wrong or plug wires mixed up.

SS RRR

iTrader: (2)

Opti not on right, plug wires not on correct plugs, timing gears not lined up correctly, valves adjusted too tight or all the above...

DerickTurner57

Is the pic of the opti in the link going to be the same configuration for all opti?

DerickTurner57

And from thee link you showed me from what it looks like I had my opti rotor positioned for #6 on tdc..but one #1 cylinder was up..Now its seems I was 180 out..I think you solved my problem..

shbox

Yes, all vented optis.
You do know that 1 and 6 are both up at the same time, right? The cam position determines which one is on compression or exhaust stroke.

Like the link says, as long as the special slot is over the cam dowel pin, it does not matter where it is positioned, it will be in time.

DerickTurner57

So I pulled the water pump and pulled the opti...The dowel wasn't even over the cam pin...so it was just floating in between those balloon shaped spaces in the rotor..now. #1 is at TDC and the cam pin is at 9 oclock...I believe the timing marks on the cam and crank should both be at 12?...I haven't taken off the timing cover yet..

SS RRR

iTrader: (2)

To properly align the timing gears the positions are 6 for the cam gear and 12 for the crank gear. For TDC at #1 both should be at 12. Only thing you need to worry about is to ensure the gears are aligned properly by cranking the engine to see if the gears align at 6 and 12. After that you need not worry about timing until you adjust valves. The opti only goes on one way. It is not to be forced on and should sit flush with the timing cover. I've actually read where people have put it on, thought it was square even though there was space and drew it on using the bolts.

DerickTurner57

I thought if #1 is up than #6 is down??

shbox

No, they are both up at the same time. Every cylinder is paired with another in the firing order. When any cylinder is at TDC on the compression stroke, the paired cylinder is at TDC on the exhaust stroke.

1&6
8&5
4&7
3&2

DerickTurner57

Ok se I think I made the mistake of lining up my timing gears at 6 and 12 and cam pin was at 3 o'clock...but this was for #6 to be at TDC(combustion.)..but does that mean I Jus made the mistake of having #1 up for exhaust stroke...so when I rotate it to when the timing gears both align at 12 and the cam pin is at 9 o'clock then that shuld mean #1 is up for compression now???....and I made the mistake

DerickTurner57

Of not having the opti properly fitted with the cam pin

SS RRR

iTrader: (2)

Again, do NOT worry about where the dowel pin is. Just worry about the cam and crank gears aligning at 6 and 12 like this:


Your opti only goes on one way therefore there is no need to worry about the position of your cam/crank as long as they were aligned properly when the chain was put on.

shbox

You did not make a mistake with the timing gears, you made the mistake of not indexing the opti properly.

DerickTurner57

Ok I definately lined up the timing gears like that and had #1 tdc...Im going to make sure I get the opti lined up right.....I know the Pcm was going crazy trying to identify what was going on...lol