ok its a 2000 gsr 4dr. i swapped in a 94 ls longblock and found and obd1 complete manifold with tb and fitv attached.

i am using the original gsr engine harness.
i am using an obd2b to obd1 ecu jumper with a P06ecu cuz i can't get a p75
i am using the original gsr dizzy
i am using the original gsr injectors
i am using the original gsr alternator

Did i check for

fuel..........yes all plugs has fuel smell to it and is somewhat wet
spark........yes but kind of weak
timing.......is dead on.

Still no start. it just cranks

side note.

i blocked off the purge solenoid nipple on the rear of the manifold
also i connected a hose directly to the breather chamber box to the manifold with no pcv valve.

help im stumped and am running out of ideas. also tried my obd 1 gsr ecu and it just cranks.

 

 

check grounds, timing(mechanical) but I don't think you can use an obd2 gsr dizzy w/an obd1 ls engine along with several other things that aren't compatible. usually ppl don't put older engines in new chassis so I don't know what need to be converted but i'm willing to bet that's the cause.

 

sounds like the dizzy change it out and should be fine you need a good clean blue spark had the same problem or rebuild your with other dizzy parts
:/

 

i cleaned all three grounds. i checked timing mechanically and still it just cranks.

 

i swapped in my brothers obd2 gsr dizzy (since its plug and play with my engine harness) this time it had bluish white spark but still no start.

what else could it be?

 

Again I will say that an obd1 engine does not simply bolt/go into an obd2 car....did you convert the things you needed to ?

 

well since im using the obd1 jumper with ecu it cancels out crank sensor and all that mumbo jumbo obd2 car have.

 

Do a compression test, if you have good spark, fuel and timing is correct, all that is left is compression, constantly trying to start an engine that is getting fuel can "wash" the cylinder walls, resulting in a loss of compression.

If compression is low, drop a tablespoon of oil into each cylinder, [spark plug hole] and crank the engine a few times by hand or do a bypass jump, [ign. switch off] reinstall plugs and try starting the engine. 94

 

funny thing is the engine ran perfect befor i bought and took it out of my friends car. ill do a conpression test anyways

 

Woo hoo it starts now! It's a miracle how it just starts out of no where. I have no clue how but I prayed..

 

check the grounds and connections to the starter, so in case it does it again you have a better starting point. good that it starts now