A 10A fuse blew in the #8 slot (fuel injectors) passenger side fuse box. On my 3.8L V-6 engine, causing engine kill/no start condition and had to be towed home. Once the fuse was replaced the engine started normally. I checked all wiring harness/inj. connectors for grounding/damage, everything looks ok. I tested all injectors for ohms resistance and all had zero ohms, not even a tenth? I checked my DVM and it tested fine. What could have caused the fuse to blow, if only powers the fuel injectors, if I am correct? I listened to all injectors with a sythescope and they all had a steady tapping rythmn. I would appreciate any assistance in finding the exact cause of the fuse blowing and/or breaking? Thanks

It could be just a fluke. That fuse is 18 years old.

But why that particular fuse and not any others YET? I just wish it would have happened on a radio or lights fuse instead of causing a tow in and $125 as well for .50 fuse blown in a secluded location under the glove compartment by the ECM. Thanks for the reply post. I am hoping that it was a fluke only !!! Just a very strange one to happen.

For as long as i have been on this forum, i cant recall anyone else having the same fuse blow. Like i said, possible fluke and maybe the machine that made it had a bad day.

I always keep spare fuses and relays in the glove box or the trunk..almost got stuck at a car show once because of a faulty fuel pump relay.

Mike, I appreciate your efforts. Does the absolute zero ohms readings tell you anything, right or wrong? I keep reading that they should have at least 2 to 3 ohms if the injectors are low resistance and as much as 12-16 ohms if higher resistance injectors. I was very surprised to not see any resistance yet when I gripped the probes, I had .96 ohms myself.
So my DVM is working correctly. Well I will carry some extra fuses and see how it goes, just don't want to get stalled on the interstate or crossing the river bridge. So it may be awhile before trusting it that much. Again thanks and if anything else comes to mind on what I can check, please reply to me. Kenny

Hey Kenny, Shoot me your email I'll try to get you a wiring diagram if you dont have one. I know most older GM'* have whats called an "injector driver" built into the PCM. So the PCM grounds the circuit. DO NOT put a different amperage rating on. You dont want to cook it.. Ill also try to find the actual resistance value for the injectors themselves.-Dan

Dan please find me a wiring diagram for the #8 slot fuel injector fuse slot. I don't have one and if the PCM grounds the circuit, that is when the overamperage may have happened? What can be done to test/check/repair it. I did replace the ECM computer over 10 yrs ago along with the PROM as well and no problems before this occurence.
Yeah, please try to find the actual fuel injector resistance value because mine have none, zero ohms ??? Cold/warm/hot engine when tested. THANK YOU very much

Last I knew, the PCM grounds the injectors anyway. When ignition is on, 12V positive is always going to the injectors.

Ok, PCM grounds the injectors, so what in the world could have caused the short and/or spike to knock the fuse out, unless the fuse just broke as was stated earlier? Could the PCM be randomly faulty and repeat the same scenario again? I just want this thing completely repair not jump out like a jack in the box somewhere down the road. That ain 't fun paying for a tow truck. Thank you so much for your effort and advice