I installed new ecm on my 93 corvette, car started perfectly for sec then shut off then it seems something is preventing it from starting!! SYS on dash is flashing, how can I by pass vats n start my beast ? please help me out, dont want to take it to dealership

 

Why?
Have you pulled the codes?
Only way to bypass VATS (if that is actually the problem) is by getting it deleted on the tune

 

Well my car was shutting off while running for while, then i changed my opti spark, ignition coil, ignition module, new sparks, good injectors, new fuel pump, n my car started to misfire, my right bank injectors where not working , so i got my ecm rebuilt, n today i plug it bak in , car started perfectly for few sec then shut off, then just crank that it n almost started but something is preventing it, my sys is flashing n security also so I guess its only VATS problem, I dont know how to pull the codes out

 

It would have been awesome if you could direct me on how to delete this bloody VATS or bypass em, I been without my beast for 2 month now

 

Shows there are fault codes stored

Several other problems that give same no start symptoms as VATS
CCM Code 41 is a common one

http://tech.corvettecentral.com/2011...trouble-codes/

 

Lots of VATS info here (how it works and how to bypass it):

http://www.vatssucks.com/

 

What VATS does is prevent the engine from cranking. It will also prevent the injectors from working by activating FEDS no having communication with the ECM. It takes a minimum of 3 minutes for VATS to reset with out re-inserting the key back in. You don’t seem like you have any of those symptoms.

I would pull the codes. Not just to see if there are any codes, but to see if you can normally access the codes normally to give validity to the ECM.

Get a fuel gauge and check the pressure. It does not sound like it has been done.

I would also check for spark out of the coil when the problem is happening. See if you get a healthy ½” spark.

Just on a hunch check the temp sensor in the water pump (ECT).

 

dont think is the vat.
it will not let you even start the car. and yours start and them shut down. add for a vat problem

 

Im experiencing what this guy is experiencing on this youtube video!! Im getting spark n everything its just fuel is not getting into injectors Check the video below it will show whats wrong with it

http://www.youtube.com/watch?v=M0OUedq3Fc4

 

especially when he starts the car, if u guys have any idea please help me out, battery is dead bc its been sitting there for while, i need to recharge it tomw

 

I don't think its your VATS either. It won't let you get a crank if it was.

If you want to pull codes go to you ALDL under the dash. Open up a metal paper clip and stick the ends in slot A and G. Stick your key in the ignition and Turn your key to the "On" position. The codes will pop upon your speedometer.

 

everyone adding their 2 cents to this thread should read the OP's other thread - http://forums.corvetteforum.com/c4-g...is-please.html - there seems to be more going on here...

 

In light of ALL the info that I have now read, it sure does sound like it has lot of parts installed in it. But I would forget about all the new parts and approach it from square 1 as a initial problem. Its either missing spark or fuel. And conditions could be changing from time to time so an open mind has to be used to.

I would get a fuel pressure gauge on it and get a noid light on both injector banks. See if there is spark off the coil or at the plugs. You need to collect data to establish what is going on to go in a positive direction.

I would check pin connections in all connectors that might relate to the data that I received. Does the digital temperature readout indicate what a reasonable ambient temperature would be.

With these weird symptoms I would almost think of the ECM doing some strange actions. But you say its rebuilt and nothing changed. I still would not eliminate anything till I got a handle of what is inputs are lacking to run the engine.

Have you pulled the codes, I don’t think will actual fix the car but wondering if any codes are recorded in module 1 and 4.

 

All I read is the poster is throwing away money while misdiagnosing the problem. He needs to pull the codes. Its NOT VATS.
It could be as simple as tightening the battery cables.

 

I basically changed everything, nothing else is left to change haha, I hope its small issue that i missed, but hey i got new components which will hopefully help me in long run

 

but why would car misfire, or do not even crank anymore?? each time something new is popping up, i did diagnostic with my mechanic, but he is also confused as well

 

God knows and everyone here. Iam not an expert. one think I learn here. is to follow the proper procedure. when you having starting problems. start from simple stuff and work your way up to complicated.

 

It wont crank anymore and dealership told me its VATS problem n quoted me for 600$ repair idk why so expensive. So my next option are, build a sim chip, buy pcm chip, or by pass some how, any suggestion will be greatly appreciated !! cheers

 

Have you checked the battery, is it charged. Do the headlights light up bright as usual.

If the dealership quoted you $600, then they should know exactly what's wrong and what they are going to change, Ask them. But it sound more like they are going to try to finger out the problem once they get the car in and get your $600.

On the 93, VATS circuits are in the CCM (central control module). There is no VATS chip to change. The 93 uses a ECM which does have a chip in to but that is for engine control and performance, timing, injector pulses, A/F mixture and other things.

I would not venture a guess as to why it won't crank at this point because there is not enough of reliable information to go on to form a solid opinion.

I think you need to start from square 1 and check the basics again. Check the battery voltage, battery connections, wipe the pellet in the key with alcohol, Have some hold the key and tap the starter, check for codes to see if VATS has an active code for module 1 (CCM), and start inhibit relay. There are more items to check also but that would be depending on the results as you go forward.

Other than yourself, a FSM and a friend with good knowledge are the 2 best things to have to get your problems resolved.

Of course the Forum is a great place to get help and there are lots of people who can. But you have to supply us with raw data and input to get the best output. Details and specifics count even if you go slow.

 

Battery voltage is good, fuel pump is running, everything is in perfect condition, car just dont crank anymore, headlight comes up as normal everyting is normal, just need to figure out how to bypass this system