Cranks -- No fuel, no spark?

[MadMaxSvx]

Sounds stupid but, did you checked the fuses? There is a ignition fuse somewhere..

[MadMaxSvx]

Originally Posted by Jonnycash

I will do that, but I checked the fuses with a test light... not visually.
I have a mechanic freind of mine stopping by tonight to go over this car with me. He has about 25 years experience, so hopefully he will be able to figure something out. I appreciate all the time you guys have devoted to helping me, and I will keep you posted on it.

Ops, you did it already..

[NiftySVX]

Check to see if the MIL (check engine) light comes on during bulb check. If it does not, the ECU is not receiving power. That's where I would start.

[Jonnycash]

Originally Posted by NiftySVX

Check to see if the MIL (check engine) light comes on during bulb check. If it does not, the ECU is not receiving power. That's where I would start.

Bingo!
We have isolated the problem to the ECU not getting power.
Thanks nifty, the check engine light did not come on.
Now to figure out where it is losing power.
I have been looking over the wiring diagrams, and cannot find a specific wire that feeds power to it.
I would like to run a jumper to that wire and see if that changes things.
Atleaste that way I will be 100% sure of the problem, and I could go from there.
Also,thanks to evryone for the help! This is a great forum.
Everyone here understands that the time spent on these cars is well worth it. This by far my favorite car out of the 25 or so I have had over the years. I'm tired of non-svxers telling me "cut our loses and get another car". They just don't understand

[Jonnycash]

Put power to the red wire heading into the ecu... Fuel pump kicked on... cranked it over, got spark. Now to figure out where the power loss exists

[alia176]

Nice job dude! Considering that you live in CT, could there be corrosion on either the POS or NEG wires? I assume that all grounds have been cleaned?

[Trevor]

Originally Posted by Jonnycash

Put power to the red wire heading into the ecu... Fuel pump kicked on... cranked it over, got spark. Now to figure out where the power loss exists

#21 --- Horrible as it may seem, you must suspect the ECU,

[SoCal LS-L]

Originally Posted by SoCal LS-L

Can you think of what would kill both spark and fuel delivery? My first guess is power supply, maybe to the ECU, where else should he check?

Did you end up pulling and replacing the #16 fuse??

[Trevor]

Originally Posted by SoCal LS-L

Did you end up pulling and replacing the #16 fuse??

Good one.

A worthy query, as this fuse also protects the fuse pump relay circuit.
Swapping with a good fuse would settle the issue.

[Jonnycash]

I cannot seemto find a wiring diagram that shows the ecu wires
I am trying to find which wire is supposed to be supplying it with power.
If I can figure out which one it is, I may be able to follow it back and see where the root of the problem is. I powered it up by one of the red wires, and it started, but 2 things I don't know:
-If thats the power wire for the ecu?
-If the ECU iseven supposed to have a full 12v to it?
I think if I find the right diagram, I may be able to see if it goes to a relay, resistor, etc...
I feel alot better now that I have gotten to this point. Thanks again guys

[SoCal LS-L]

Originally Posted by Jonnycash

I cannot seemto find a wiring diagram that shows the ecu wires
I am trying to find which wire is supposed to be supplying it with power.
If I can figure out which one it is, I may be able to follow it back and see where the root of the problem is. I powered it up by one of the red wires, and it started, but 2 things I don't know:
-If thats the power wire for the ecu?
-If the ECU iseven supposed to have a full 12v to it?
I think if I find the right diagram, I may be able to see if it goes to a relay, resistor, etc...
I feel alot better now that I have gotten to this point. Thanks again guys

You DID download the service manual correct? The ECU wiring is illustrated in the .pdf "wiring diagrams", and its a couple pages in....

You never said if you inspected or replaced the #16 fuse.......

[Jonnycash]

Originally Posted by SoCal LS-L

You DID download the service manual correct? The ECU wiring is illustrated in the .pdf "wiring diagrams", and its a couple pages in....

You never said if you inspected or replaced the #16 fuse.......

I did inspect and change fuse #16. That was not it.
I have ben looking through those diagrams... Is it MPFI control unit?
Thats the only one I see, but I didn't think that was the ecu.

[SoCal LS-L]

Originally Posted by Jonnycash

I did inspect and change fuse #16. That was not it.
I have ben looking through those diagrams... Is it MPFI control unit?
Thats the only one I see, but I didn't think that was the ecu.

Its one and the same, and its also the unlabled one thats represented on the left that has the many teminals... im not sure if thats a typo or what, but its the ECU.

[Jonnycash]

Originally Posted by SoCal LS-L

Its one and the same, and its also the unlabled one thats represented on the left that has the many teminals... im not sure if thats a typo or what, but its the ECU.

Ok thanks.

[Jonnycash]

Well,t's back up and running
Thanks very much for all the help, hopefully I will be able to help one of you out one day.
Heres what I have determined...
I located the ecu power supply pins.
Checked them... no power.
Scraped a little insulation off of 1 of them, put power to it with a lead wire with a 10 amp inline fuse. Relay clicked, fuse popped immediately.
Cut the wire completely, replaced fuse... still running as we speak, also took it around the block.
I am lead to beleive, one of the power wires on the ecu has grounded out somewhere.
I will never find that needle in this haystack, so I now have a new power wire with a 15 amp inline fuse.