Thread: wont start!

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sbc 350 with factory TBI and jet chip
cam 214/224 @.050 .443/.465 112LSA 97LCL
intake closes at 57.
2.02/1.60 valves with 1.5 rockers
9.63 SCR 8.13 DCR
plug gap set at 0.035

This is a brand new build. I am having trouble getting it to start. New distributor,cap,rotor coil,plugs and wires. It seems to want to fire just slightly and then will fire through the exhaust occasionally. I have checked the firing order to be 18436572. I have tried starting with timing retarded, straight up and advanced. I seem to get more as I advance it but still will not actually start. I am getting a nice fat spark but still nothing. I checked valve adjustment and lash. I have fuel, compression and spark. I figured that it must then be ignition timing related but still nothing. HELP!

will it run on starting fluid?

If so --

The fuel pressure needs to be near 40# psi
Fuel pumps typically run for only a few seconds on key on and then shut down--restart when syssstem need s fuel

Any chance of a theft control modual disabling it?

Jerry

will not hit on ether, no security system
almost act as if it is getting too much fuel........will try putting factory chip in?

Also to set the timing there is a wire you got to disconnect

Originally Posted by jerry clayton

Also to set the timing there is a wire you got to disconnect

this wire is to set timing on a running vehicle? has to do with retarding from computer?

If the timing is set correctly, and you have spark it should start on starting fluid( I even used my mother in laws hairspray once)
Does your system use a key with the insert?

If you have fuel air and spark it should run if the timing is correct, the cam timed right, and fuel into the cylinders-

You said new build--was this engine in this vehicle before? with the correct wiring harness? Can you hear the fuel pump run?

this is a rebuild with the same fuel and ignition set ups. The cam is quite different as far as duration is concerned. Fuel injectors are pushing fuel (I can see them right at the air cleaner)
I swapped back to the factory chip and got some backfire through the intake so at least I am getting somewhere.

you are probably mis timed--either ignition or maybe cam or both

You can probably find the connector for the timing wire--if you disconnect it you will have manuak timing---the bigger cam maybe causing some problem--is all the sensors hooked up? map, maf,Etc?

all sensors are connected. IAC MAP TPS and O2. I seem to be getting too much fuel. I have the exhaust stripped down to just the tube headers and there is fuel in the pipe.

cam is timed 4 advanced over factory card. It was degreed and measured for accuracy and to set up the DCR at 8.13

if the cam is too much would it at least start? I am going out to clean the plugs and try again, hopefully I will have some more details soon.

good idea about the rings and fuel wash. I kinda lost sight of that in the frustration. The outside temp is about 40 degrees. The temp gauge peaks when the starter is turning and then drops back down when I let off the key. There are 2 sensors that have to do with the coolant one is in the manifold next to the inlet and the other is located in the head.

cleaned plugs. shot of oil to each cylinder. disconnect fuel turned over few times. Checked all wiring connections to temp sensors and grounds. reconnect fuel. turn key. Backfire through throttle body and minor fire while fuel burns off. Retry and nothing but the starter spinning and the temp gauge peaking.
Could it be that the cpu thinks that I am overheating and is shutting me down? If so then why do I still get fuel and spark?

Originally Posted by DennyW

Leave the tbi injectors disconnected. If it's back firing back up through the tbi, that means either there is to much fuel laying in the intake, or you are to far advanced.

With the tbi injectors disconnected, it should still fire and run until the fuel burns off in the intake. Try that to start with. Hold the throttle just off idle, as in giving it just a little help.

I am 6 btdc. I am still getting the excess fuel lighting off now at the exhaust collector. Still no signs of life, just the whine of the starter. Any thoughts on the temp gauge.