Originally Posted by
pizzaguy
Ten years ago, this was easy. RCMs and SKREEMS failed in predicable scenarios. As our cars age, we are now seeing odd little variations of some of the failure modes.
I've seen posts where I thought, "I know what that is, it's this.............." Before I can comment, someone else tells the person what it is.
Two weeks later, we learn we were wrong, because it turned out to be a new failure mode with similar symptoms. Our cars are aging and diagnosis may become somewhat more difficult. I'm not saying this will be insurmountable, just that those of us giving tech advice damn well better be aware of this - you cannot take ONE symptom and throw out an fifteen year old 'fix' anymore. We are moving from the days where one symptom equals one cause to a day where one symptom will have two or more likely causes.
Once again, I caution you all: Be careful about what tech advice you take from the members of this forum, myself included. SKREEMS are now failing with symptoms we've not seen until recently. "Three cranks and nothing" once meant a SKREEM failure, and it still does. But OTHER modes of failure in the SKREEMs seem to be popping up.
At one Dragon, we had a "crank but no start", which is always a Crank sensor, right? THIS time, it wasn't . There was an output lead from the RCM that was damaged and was shorting to ground. A fuse in the RCM was blown.
The guy changed the fuse and made it almost home, car quit going down the road. Put in another fuse, made it home. It took him less than 1/2 hour to find the short to ground, but I've never heard of that happening before or since. Just an example of how we can no longer take ONE symptom and tell someone what the problem is, only what it MIGHT be.
Your issue, Romad, appears to be one of the new failure modes. Let's hope we can learn from your troubles, sorry, that's all I can contribute right now.
Hi. I just HAD to comment. You have know idea just how much I appreciated your comment on how age now plays such an important part in diagnostics. You are so right !
Dried and cracked insulation around wires, rusted and corroborated grounds and dried and split vacuum lines, were all things that didn’t play much into issues on newer vehicles but can be very relevant on aged ones.
Far to many younger mechanics at auto dealership just seem to miss this. They’re often very quick to change a component without any thought to the little wires connected to them.
Anyway.
I loved your comments.
I hope they are read by many !!