Thread: Ground issues

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Narrowing the problem down one day at a time... lol Thats the way it goes sometimes...

Originally posted by Fonzy
Narrowing the problem down one day at a time... lol Thats the way it goes sometimes...

sounds like you know what youre doing anyway.

I try... Thats about all I can say...
I zip tied the PCM and red clip tonight. If it gets me through the week without any problems, I'll consider this another case closed. If not, well, I'll have to dig a bit more I guess. Let's just hope this is it...

Just to update--- It's been one week and no problems as of yet... If it goes till this weekend with no problems, I'm going to put my new computer with my Hypertech chip in it and zip-tie the crap out of it again and throw a big party... lol...

Originally posted by Fonzy
Just to update--- It's been one week and no problems as of yet... If it goes till this weekend with no problems, I'm going to put my new computer with my Hypertech chip in it and zip-tie the crap out of it again and throw a big party... lol...

sounds like your on to somrthing.

Thats what I thought til tonight... Went to Wal-mart to do some shopping (which is right up the street). Came out and the truck wouldn't start. I tried to move the plugs around a bit and nothing. I cut the zip ties off and played with the wires a bit more and still nothing. So my nd my girl walked home and now I know what I'm going to do in the morning. I've got to go get it and hope it starts. Maybe put the new computer in and zip tie it up again and see if I can get another week out of it... Oh well, may still be onto something. Still not dependable though...

Ok. I need you help once more Lt1. I'm still not getting a signal to my injecters, but I think I'm up against somethign much bigger than a loose connection as originally thought. I ran that same test about 4 or 5 times trying to figure it out. Two of the times I came up with the faulty connection but the other two times I came up with an open circut at 467 or 468. Thats the first time this has come up. According to the wireing diagram for my inhjecters, 467 is a dark blue wire going from the ECM to one of the injecters and 468 is a dark green going to the other injecter. I'm not sure how to check for an open circut on these wires but I have a feeling that I'm going to run into more of a problem that i can fix. If you've got any info to lend I would appreciate it. If I can't do this my self, it will end up getting towed into the shop. Thanks in advance for your help...

I'm not sure how to check for an open circut on these wires but I have a feeling that I'm going to run into more of a problem that i can fix. you can fix it just hold on.

take your ohms meter unplug the connector at the computer and at the injs. and check continuity on D16 and D14, to the inj. 467 and 468 are the ground wires going to the injs. from the comp.


if you have continuity then there is nothing wrong with the wires.

? do you have 12v on the red and white wire at the injs. with key on. check with test light not noid light.
if we can got togother here we'll fix this thing

I do have 12v with the key on at the inj. I will have to work on the continuity tests later. My truck is in the Wal-mart parking lot and it's gonna stay there till Monday. I've got a friend comming over in the morning and we'll try it then... Hope your weekend is going good... Mines not bad aside from the truck. Just got back from a friends house and riding 4 wheelers... Much more fun than working on a truck... Thanks for the help, I'll let you know what I come up with in the morning...

ever think about getting a carb?

No actually I didn't... lol Thats kinda funny though. I'm not much of a carb man myself, I never could get one to run right all the time. Either to rich or too lean never somewhere in the middle.

Ok LT1... I ran a continuity test on the 16 and 14 plugs and nothing. I then ran it on each of the injecters and nothing on either one of them. I'm not sure if I did this right but I had the key in the on position when I checked it and i didn't get anything out of anything! Let me know where you think I should go from here. In my opinion, I've got a bad wire in the harness and I don't like it. Any other advice?

I ran the test originally on the red plug which is the A-B plug, I suppose that the blue plug is the D plug I need to check, is this right? I thought about that after we came back home. That may explain why th einjecters didn't check out right... I was checking the red plug because that was the one I checked with the last test. I'm on my way back to check the blue plug and will let you know... thanks

ok... Heres what i have. I checked the blue plug which should be the D16 & D14, they show up as a -1 which probably isn't right. Either way the inj's don't show anything on the scale. Does it matter that my multi-meter is digital? I rechecked with my 12v light to make sure the problem still showed the same open circut and it is. Any advice??? Thanks

dont sound like you;re checking it right. if the noid light is "on" at the inj., but not flashing when you turn the motor over then you've got a short. it should be flashing. you need to check those 2 wires and make sure they are not shorted to groud. the computer is the ground for the inj. so both of those wires should be open until the computer. grounds them. the inj. could be shorting out all so. take the ohms meter and unplug the plug at the computer and at the inj. put the - meter lead to ground and the + to # 14 and # 16 pins and see if either wire is shorted to ground. should be open. dont cut the key on. check the ohms across the inj. also should be over 1.3 ohms. if the truck is running now its no need to check it its gonna check ok.