qldit

Good Morning dgoad, my compliments to you, you most definitely are an "ace" with applied logic and experience!

Your experience feedback will certainly give others clues as to how to interpret problems and also reinforces my own personal limited experience.

And yes, reference the brake boost leakage, isn't that always the way it goes!

From my own experience any use of battery jumper cables should be avoided, I get criticism whenever I insist on removing a flat battery and charging it or replacing it, when those kinds of problems happen.

And yes again, your finding with MAP sensors being interpeted as problematic by codes is inline with mine when in fact they are OK.

I don't really give much notice to codes, but simply consider them as "possibly assistive"

You most certainly had a crash course in these systems!

As you are aware, the spark voltage is always negative polarity, but if you ever get a chance to really get up close and personal with it, you will observe a fine blue centre to the arc with a trace of jagged yellowish (fire) on it's outer edge.
If ever you try this though, use a conventional ignition (points system) in case the electronics in the system may be adversely affected.
(use a plastic rimmed magnifying glass, not a metal rimmed one like I did!!)

By the way, I had a simple brake job recently, just change the pads, when I compressed the caliper pistons discovered leakage in their seals, then discovered the supply hoses were also wet, so a twenty minute job ended up taking a couple of days and became quite expensive! (waiting on parts!)

The old domino situation, don't you just love it!!

Once again, well done!

Enjoy the that satisfaction!

Cheers, qldit.

Raylo

The trick is to get the kids to help with the repairs in hopes of starting them on their way to being self suficient auto techs or at least able to deal with repair shops intelligently. Then dad can rest! I have a friend who is constantly visiting the Crazy Rays wrecking yard here for parts damaged by his new drivers. Last week he got a hatch door a hood and a headlight assembly. Now he needs a pair of aluminum wheels that had a run in with a curb. Bt at least there's nothing to diagnose except for bad driving.

You are right about the fuel pressure being a sneaky thing to diagnose. On the 4.3 CPI engine that runs at much higher FP (something like 50-60 psi) a slightly low FP (by 10 or 15 psi) will get you a no start. I had that one and it had me going (or not going!) for awhile.


[QUOTE= If is was not for keeping your kids in vehicles, what would dads be good for, right?

Paininthebrain, I too had that problem several years ago with small chevy. Yes, when the fuel pump pumps the fuel right back in the tank it will not make the correct amount of fuel pressure for the TBI system or injectors. Not knowing what is wrong and how to fix it can be a hardship. I have felt your pain.