Join Date: Jan 2009
Location: Santa Barbara, CA
Bronco Info: '93, 302, Rancho 4" lift, LS diff, 33" Micky Tom Bajas
New ECM, ran briefly, now no spark or fuel
Here is my story:
'93 Bronco with a 5.0 and E40D
A few weeks ago the truck stopped running. The fuel pump was on constantly, no fuel in the cylinders. Was found to be a burnt ECM.
I replaced the ECM, the fuel pump would now prime normally, but when I turned the key to start, nothing happened. I was able to start the truck by running a jumper from the battery to the stater relay. Did this a few times and the truck started and ran fine.
I started the truck via a jumper to the starter relay when put the new computer in. It started fine. Then I bolted the inner fender back in place and started packing up.
When I finally got loaded up and ready to drive home. I went to run a jumper to the starter relay. The engine just turned over but wont start. I have no fuel at the rails (the fuel pumps don't activate) nor do I have any spark.
I checked the output from the coil while the engine in cranking via a jumper to the starter relay and there is nothing coming from the coil. I went to swap the fuel pump relay for the horn relay and found that my horn no longer works either.
I have a thought that maybe the new ECM got fried, but I cant take it apart without violating the warranty on it. So I am not able to check that.
I am pretty frustrated and confused. Where to from here?