There are a number of signs that become apparent when an ECM computer on a 1990 Chevy is going bad. The top signs include a non-functioning speedometer and flashing codes on the dash.
the most common symptom is a clicking noise when making sharp turns, you can take a quick look and see if there are signs of any of the boots leaking, if you catch it right away the joint can be saved
No electrial spark or fire at the plugs.
possible problems are: The fuse is blown, or the injector is bad, or the wiring to the injector is bad, or the computer is bad
Could be many possibilities, tell us your symptoms.
it is probably a bad ignition module or computer
loss of communications, many things could cause this from a bad ground, to cut wire, to a bad chip in the computer ecm
A bad computer could cause several problems. The car may not shift properly. The overdrive might not work. In some models the transmission may stay in forward gears no matter what the selector is set to.
alot if you want a Chevy with no power buy a ford it could be computer or just bad gas or plugs or wires or airfilter or a bad bearing new tires um i can keep going here take it in get it looked at
The idle or pulley will have movement in it, when the engine is shut off. It can also have a visible wobble while the engine is running.
signs of bad luck are when sometiing bad happens and it keeps happning for the whole day. those are the signs of bad luck.
if you can not see a leak!! check water pump,or intake gaskets,or a bad head gasket, GOOD-LUCK!!
if the crank sensor is bad it does not tell the computer that the crank is turning it will not fire up the engine.