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Burnt burb resurrection (It's mine again!)

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This reminds of an issue early Trackers/Sidekicks have. Their ECM's get hot and the solder on the circuit boards melt and crack. Cause all kind of running issues and starting issues.

Makes me think something similar is going on.
 
That's why I always thought the ignition module. That's textbook ign mod symptom. But you have aperently replaced that. Also, the pickup in the distributor can cause this kind of thing. But again, you replaced that. The other thing is, the injectors are told when to fire based on the distributor signal. So the signal must be making it to the computer or the injectors wouldn't fire. Or that line of logic should hold water. So what's between the computer and coil? That would be where I would start investigating.
 
y5mgisi said:
That's why I always thought the ignition module. That's textbook ign mod symptom. But you have aperently replaced that. Also, the pickup in the distributor can cause this kind of thing. But again, you replaced that. The other thing is, the injectors are told when to fire based on the distributor signal. So the signal must be making it to the computer or the injectors wouldn't fire. Or that line of logic should hold water. So what's between the computer and coil? That would be where I would start investigating.
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at one point I ran power directly to the coil using a spare pigtail and it still didn't change anything that way..
y5mgisi said:
Does your have that spark retard box thing next to the egr solenoid? And have you replaced it?
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and yep... that's new too:confused: gonna do a lot of playing with it again tomorrow.. day off and its warming up finally
 
I feel like one of the circuits in red must be messed up. Maybe a continuity check of those circuits is in order? Im just thinking of anything that would let the injectors fire, but not tell the coil to ignite.

 
I took the 2 wire pigtail jumper that connects the dizzy module and coil out and did cont checks on that.. wiggled it all around and stuff at the time... and that looked good. ill see if I can check the others out
 
You see what I'm getting at tho right? If the dist tells the injectors when to fire, and they are, but the coil isn't firing, it could be something in that system.
 
I have an extra one you can have, it just isn't for a 7747. Not sure if they changed up the connectors on different ECMs.
 
the chances in our local yard may be slim... I really don't wanna go through the hassle of changing the harness to put a used one in though... I've been looking into the Howell, painless, and AFI harnesses... have the cash but just haven't jumped yet incase the data logging shows something and I DONT need a harness.

as for looking at it today ive been busy all day and haven't had a chance:doah:
 
I was able to help rick out.. his tps is reading .9v . once he gets that to .5v it should run right.
 
I did get a chance to check it earlier... and I had spark but its real weak... not sure :dunno: but getting the tps set right will be better than it was either way... I will see what I can do tomorrow.

thanks again Jess for helping me get that connected...:waytogo: it'll help a lot with getting this straightened out im sure.
 
y5mgisi said:
Yea im not convinced. Thats not a huge difference.
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Yah but that was the same problem I had. It would start and run then it would bog down and add a bunch of fuel, die and be a pain to start back up. And yes 10% is not a lot, but to the computer it makes a ton of difference. The computer thinks the pedal is pressed all the time. I didn't get a chance to look at the rest of his data cuz the truck didn't start. And he did have an error flagged, I forgot to check. I'm not saying the tps is the end all be all, but he needs to fix that first otherwise all data/ fueling/ iac steps can be thrown off. The ECM is basically doing math, if one of the variables in the problem is off, the answer(way the truck runs) will be off.

I would be curious what the plugs look like. I think it could be fouling a few plugs, causing weak spark.
 
pulling a plug this morning to see... and I have to double check a few things. Im going to unplug the fuel pump relay, then remove all the plug wires and try one by its self to see what I get. Its time for new wires anyway... Its one of the few small things I haven't replaced. they have less than 5000 miles on them and they all look new still. but they are 4 years old now and have been pulled off and put back on numerous times ... cant hurt either way....
 
I got the TPS set at .5. Now I just gotta get it to start:doah: It actually took ALOT of adjustment to get to .5. The TPS % now says 0 instead of 5%. at WOT it only gets to 92%, but how often do I really get there and would it really matter.:rolleyes:

cant try and start it cause the battery is dead again:confused: I'm going to need a new battery and starter before this is all over:haha:
 
shady said:
I got the TPS set at .5. Now I just gotta get it to start:doah: It actually took ALOT of adjustment to get to .5. The TPS % now says 0 instead of 5%. at WOT it only gets to 92%, but how often do I really get there and would it really matter.:rolleyes:

cant try and start it cause the battery is dead again:confused: I'm going to need a new battery and starter before this is all over:haha:
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dont forget to hit record and log that data when you do get it started.
 
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