Rebuild finished, no start! HELP!

[4cd-Air]

Ok, as I expected, we are at the diagnosis portion of the rebuild. It's together and in, but it won't start. There is spark, there is fuel, and air.

The symptoms:

:Turns over fine, no fire
:Backfire through the intake (hot air through the throttle body, like the intake valve is open when spark occurs)
: Boost guages read spikes of pressure of 10-15 lbs (from the backfire, and the MAP?)

All in all, the engine sounds like it always did when it trys to turn over. When it reads boost, the engine bogs. I hope this is electronic and the cam isn't off. Help me guys, I'm almost ready to take it to a shop and tell them to fix it.

Shane

 

[Intercooler]

Cam sensor set properly?

 

[Steve Wood]

cam sensor not set properly or the crank sensor in the wrong groove.

 

[TRENT THOMPSON]

Steve,
really dumb question which groove do you set the crank sensor. the upper most or lower most. thanks

 

[qwknuf6 jr]

Sounds like the Cam Sensor is 180 out or off all together . I had the same problem . Try setting the cam sensor on the other stroke .You have a 50-50 chance

 

[Steve Wood]

That is not a dumb question....I have to look everytime!

it goes thru the rearmost slot...rear meaning the end opposite of the connector. (I consider the connector side to be "front")

I have been told by one mechanic on here that it makes no difference but none of my cars will run that way and you can figure out how I know that..LOL

 

[ACLR8R]

I was having the same problem as you about two months ago, set the cam sensor and it fired right up. I went from to !!

 

[4cd-Air]

Well, it wasn't the crank or cam sensor. I took it to a shop I trust for the fine tuning. I'll try to let you guys know what it was.
Shane