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Old 02-01-2011, 12:18 AM
Creatine Creatine is offline
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1990 4.3L TBI not firing

Hi everyone,

I am trying to problem solve my friends truck. I will list everything that I know has been done/tested so far, so you can better assist me in helping him out.

The truck was running fine, up until a starter was swapped out of the truck. Then electrical problems existed ever since. Somehow, the fuel pump was not turning on, so they jumped it with a straight 12V from the fuse panel (no inline fuse). It ran for about 4 days then died (the truck not pump). My friend started school so he parked his truck ever since, and its been over a month now.

He is trying to get it going again, so I started testing a few things. We have compression and spark, I put some gas down the carb and she tried to start each time. I also manually pulled plugs and wires and checked that they were ok. The fuel pump is running (gota love GM FPs) I can hear her going all day. The fuel pressure I am not sure of yet, but will be picking up a local test kit to get back at you on the pressure. Seeing as they did not put a fuse in, I could see that messing it up. There is no fuel spraying out of either of the injectors.

I pulled off the injectors and hooked up my multimeter and got practically 0V coming out of either of them. I was told the best way to test these though is with a NOID light or using a 194 bulb. When I get a chance I will do so.

I don't see what problem from changing just the starter could have caused all this to happen. Maybe the mechanics tried messing with the truck, idk. Before it went to the shop the truck ran mint.

I have seen around the internet of similar problems relating to the PCM, bad grounding, fuses, or not enough fuel pressure. How can I test if the PCM has gone bad. He said he has checked his fuses but thats only his word right now, I will manually check them myself when I visit him again on wednesday (it was dark at the time with no light when I tried last week)

What other steps/tests should I preform?

Thanks,

Kevin
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