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Re: the car wont star
try disconnecting the battery first, while disconnected unplug the ecm. check for any moisture or rust.
if you find any, then yes replace ecm. if not then plug it back, connect the battery and see if that help.
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did u change the ecu its possible that the ecu is coded to the keys and maybe the injectors.also if the engine including loom went in but u still using the previous ecu the pin config on the loom plug is not the same as ecu pin config being different year models
This one is kind of hard to answer. But I'll do my best with some suggestion.
First, let's find out if the ECU is OK. Put the key in the ignition and turn it without cranking the car, check the display, if you see the check engine lit up, then the ECU is fine. If it doesn't lit up, then your problem is the ECU.
Also, check the spark plug cables, check the distributor cap.
Check the relays, I'm not sure if any of the relays is related to the engine.
Also, make sure the alarm is working fine. If it's faulty, maybe it won't let any current goo thru.
attach any scan tool then push ECU reset. if desperate pull battery neg lug for 5m, and put back. this bat pull, also resets all things, even things not wanted. radio, alarm., remote start bs box, and other things.
the ECU on many cars calibrate the TPS, when freshly booted. so reset the ecu.
your fuel pump may be that cause, have some one turn da key while you listen for fuel pump by gas tank, no noise pump not working, then get a rubber mallet and has soon they open ingition switch hit gas tank pump may star working may not but you will kown per shure your pump is bad