I seem to remember I’ve seen two wires on one ring terminal, yes.
Interesting, I wonder why I it was redone.
Bad running after manual swap
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I seem to remember I’ve seen two wires on one ring terminal, yes.
Interesting, I wonder why I it was redone.
It sounds tempting, but I think not. Doing so would create a small voltage potential across the intake manifold and engine block (I.e., across the gasket), including coolant passages, which might be unwise. This would occur when the vehicle is in operation and the ground strap is carrying return current. As a short term solution? Perhaps, but I wouldn’t leave it that way. Others may comment.
Hmm… did GM put a strap on your engine on the driver’s side, perhaps?
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Ok so I’ll try to get it to the back of the cyl head.
I don’t think there’s any on the drivers side, everything seems to be on passenger side according to the 94 FSM.
also yeah, called the mechanic today and the new ECM didn’t fix the communication issue. We agreed together if he can’t figure anything out by end of Monday I’m gonna go pick it up.
Then I’ll sort out the grounds and stuff.
Then I’ll sort out the grounds and stuff.
FYI, I was looking through the 1991 FSM at the wiring illustrations, thinking your 1994 might be similar.
Here are the illustrations showing the engine-to-body and body-to-frame grounds straps.
This is clearly a case where the engine-body ground isn't connected to the same head as the alternator, as I supposed in my earlier post.
Here are the illustrations showing the engine-to-body and body-to-frame grounds straps.
This is clearly a case where the engine-body ground isn't connected to the same head as the alternator, as I supposed in my earlier post.
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Here's the battery wiring, showing the "-" connection to the fender and the "-" connection to the engine... although the actual location of the engine connection isn't plain. Based on what I've seen in the 1998 FSM, that connection's down on the front of the engine near the timing cover, passenger's side.
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Here's an illustration showing the grounds on the intake manifold.
Again, this is for 1991 so your year (1994) may differ.
Again, this is for 1991 so your year (1994) may differ.
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Awesome! Thank you very much for the diagrams of these grounds, helps a lot.
Was definitely a bit confused about where on the back of the passenger cylinder head the ground went, because when I felt it at the junkyard there was multiple holes. Now this diagram clearly shows that it goes on the bottom hole, theres 2 holes up top that aren't used then one below it on the intake side that is used for that ground. Shows me exactly where it needs to go!
Was definitely a bit confused about where on the back of the passenger cylinder head the ground went, because when I felt it at the junkyard there was multiple holes. Now this diagram clearly shows that it goes on the bottom hole, theres 2 holes up top that aren't used then one below it on the intake side that is used for that ground. Shows me exactly where it needs to go!
To be honest I do question if the ground is even the problem, more likely it's one of the power wires to be honest.
Unless when I move the coil around its losing ground intermittently because of missing those grounds, still gonna replace them because it needs them but I have a feeling it's not the coil problem.
Unless when I move the coil around its losing ground intermittently because of missing those grounds, still gonna replace them because it needs them but I have a feeling it's not the coil problem.
If you don't have good ground engine-body and body-frame (and thus engine-frame), there may be tramp currents in strange places, and attendant voltage offsets (V=IR) between different "grounds" on the vehicle.
Ground wires are every bit as important as "power" wires, even more-so because grounds often provide a shared current path for multiple devices... which means, if the ground is bad, some devices can cause effects on others for mysterious reasons.
Can you tell me this: What's the return path for the current from the coil to the spark plugs? Remember, it has to get back to coil, somehow. Think about it.
Fix the grounds!
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