Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hi, My name is ***** ***** for the delay.
I will do my best to assist you
what fuse doesnt have power?
tell me,,does the fuel pump come on for the first two seconds when you first turn the key on?
will it stay running when you prime it?
ok,did you replace the module or the pick-up in the distributor?
but what was you testing?the ignition module or the pick-up coil?
no,,the pick-up coil can not be replaced without pulling the distributor and taking it apart
you replaced the module..the likley problem is the pick-up..you may just want to replace the complete distributer with a new rebuilt unit
yes,,i understand you are loosing injector pulse
if it isnt the pick-up,you may have fried the ecm[computer itself]
no,,you can have spark and no pulse
what happens is the computer will not send a pulse unless the engine is turning
the computer uses the pick-up to know when the engine is turning
also,,the fuel pump
the fuel pump only runs for 2 seconds,,when you first turn on the key,and,all the time that the engine is turning
again,,it is possible for you to have fried the computer itself when you shorted out the wiring at the plug
the good thing is,these older computers cost less than $100 now
make sure the ecm fuse isnt blown
no,,you wouldnt get codes because the computer wouldnt know anything is wrong,because it doesnt know the engine is turning
replace the pick-up or the distributer
yes,,i think it is either the puck-up or the ecm[computer]
there is nothing else if the wire harness is good
i know you read the foums,but,we know what isnt wrong,the module,because you replaced it.
replace the pick-up
the forums arent wrong
the module can do this,,but most times whe nthe module does this you will also loose spark,,again,you say you already tested/replaced the module,,so,we pretty much can rule out the module,,right?
so,,that leaves us with the pick-up[this is likley] and the ecm
there isnt anything else
i can also give you the fuel injector wire diagram,,stand by
PLEASE COPY AND PASTE the link below to your browser, I have uploaded more info on this there please copy and paste the link below to your main browser[INTERNET EXPLORER or FIREFOX]
if the link doesn’t work that way, try it this way
If you are satisfied with my answer, Please Rate my answer by clicking the rating button so I can get credit for my work. I’m not always going to be giving you good news, so please don't let this stand in the way of you accepting my answer. .it does not cost you more money and we will still be able to communicate, ,.please understand, i can not see, hear or touch the vehicle and only know what you tell me. Bonuses and positive feedback are appreciated.. if you are not satisfied with my answer, please do not leave bad feed back ,i will gladly opt out and let another expert handle the question. .if i have sent any diagrams, please print them. .sometimes you may need to right click the image [,then save picture as]to save it to your computer so you can open it with your picture program...Please ask if you need more help
yes,,i understand,,it is possible that a quad driver is burnt out in the ecm ...
it is also possible that it is the pick-up..
again,we have ruled out the ignition module because you say you have tested and replaced it.
i understand this,,
but,i am addressing your problem on the info you are giving me
i really dont understand what you are trying to prove to me
what are you wanting me to tell you?
where does the voltage come from?
all the wires to the injectors come from the computer,,the computer breaks the ground to create a pulse
the computer uses inputs from the ignition module and the pick-up .
the module and pick up tells the computer["i am turning,activate the injectors"
if the pick-up and /or the module doesnt send the signal,or the computer doesnt know it is getting the signal that the engine is turning,the computer doesnt know it is turning and will not activate the injectors or the fuel pump..it wont give a code,because it doesnt know it is turning in the first place.
you are very correct,,it is possible that the computer is dead
lol,we have established that .
i gave you the diagrams so you can test all you need to test.
these obd1 systems are fairly simple
an ecm can malfunction in many different ways,,it is a computer,,it can go completely dead or only loose drivers to certain things,,this guys opinion/problem may or may not be relevant to your problem..my thoughts are the same..
either the pick-up or the ecm..if the wire harness is good
do you have power on the ecm1 and ecm2 with the ignition on?
if you have power on the ecm fuse,it should have power to the ecm...
if the pick-up doesnt fix you,i would think you will need to replace the ecm