GMC Repair: 1993 gmc 5.7 surburban wont start, injector pulse, starter fluid

Question

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Followup To

Question -
truck wont start every thing tested good spark ,(fuel pump replaced)computer replace. carb. not spraying gas carb. is good tested.please help thanks

Answer -
First I would verify your fuel pressure. Make sure that the fuel pump is supplying the fuel injectors with fuel. One other thing to try is to spray carb cleaner into the throttle body (the thing that looks like a carburetor) while you have someone else start the truck. If it runs on carb cleaner then your problem is certainly fuel. If this is the problem and you are getting fuel pressure at the fuel rail then you have a problem with the injectors. If they are not spraying and you have fuel pressure then for some reason the PCM is not sending the injector pulse to them, check for power at the injectors to make sure that they are getting power. If they are getting power then they are plugged.

Check this and if you do not find the problem then get back with me.[ It`s get gas to the carbs. and it run when you spray starter fluid in the carb.carbs. was tested on another truck and it sprays replaced other part mention still dont start. think about replacing new fuel pump could be bad .is thier any chance it could be the pick up coil but the spark plugs are firing.please help.thank you

Answer
If it runs when you spray carb cleaner into it then it is a fuel problem and may be a bad fuel pump. Also, replace the fuel filter, just in case. If you can check the fuel pressure it should be at least 13 psi.


I am sorry that it took so long to reply, it has been very busy around here.