Ok I'm getting scared.

[clarkaw1]

I just pick up my Bronco from the Exhaust shop and...Damn it sounds good. It also had some rattling that I didn't even know would go away with the new exhaust system...bonus!. Now last week, I figure out my idling problem by a semi mistake on my behalf that turn out in my favor. I relocated the vacuum line for the vacuum advance from the metering block on the carb, to a full vacuum port and now it idling the way it should. So anyways, now I scared, the Bronco is running way to good and Murphy’s law is going to apply very soon, something and has to fail soon, right?

 

[kayakersteve]

That's OK - We're all in the same boat. Afterall, these weren't made yesterday adnthings are gonna break.

 

[Stutsmo]

Yep be afraid,be VERY afraid!! Actually all you can do about it is drive it untill "IT" happens, then hope for the best. (or should I say Cheapest!)

 

[broncnaz]

Not sure on your setup but the vaccum advance should be hooked to a ported vacuum port. Sounds like your timing may be very retarded at idle and the full vaccum brings it to where it should be at idle speed. Your probably missing some power at the top end with it hooked up the way it is.
No matter where the vacuum advance is hooked up intial timing needs to be set with it unhooked and idle speed and quality are adjusted as well. If your only getting good idle with the vacuum advance hooked up then something is wrong else where. mainly intial timing.

 

[Airmapper]

Did someone say Murphy's Law?

MURPHY'S LAWS



1. Nothing is as easy as it looks.

2. Everything takes longer than you think.

3. Anything that can go wrong will go wrong.

4. If there is a possibility of several things going wrong, the one that will cause the most damage will be the one to go wrong. Corollary: If there is a worse time for something to go wrong, it will happen then.

5. If anything simply cannot go wrong, it will anyway.

6. If you perceive that there are four possible ways in which a procedure can go wrong, and circumvent these, then a fifth way, unprepared for, will promptly develop.

7. Left to themselves, things tend to go from bad to worse.

8. If everything seems to be going well, you have obviously overlooked something.

9. Nature always sides with the hidden flaw.

10. Mother nature is a b****.

11. It is impossible to make anything foolproof because fools are so ingenious.

12. Whenever you set out to do something, something else must be done first.

13. Every solution breeds new problems.

 

[stupidboy]

The vacumm port you use should not have any vacumm at idle.

 

[clarkaw1]

Not sure on your setup but the vaccum advance should be hooked to a ported vacuum port. Sounds like your timing may be very retarded at idle and the full vaccum brings it to where it should be at idle speed. Your probably missing some power at the top end with it hooked up the way it is.
No matter where the vacuum advance is hooked up intial timing needs to be set with it unhooked and idle speed and quality are adjusted as well. If your only getting good idle with the vacuum advance hooked up then something is wrong else where. mainly intial timing.

About a year ago I had major problems with the idling and found out that the PO remove the in-line resister (with the help of Mr. Viper) so the coil was running on what ever the alternator was putting out and causing it to stall as soon as it was started. I installed a Chrysler resister to supply a constant 12 vdc to the coil and that help around 90% and now with the vacuum line hooked up to full vacuum pressure it idles like it should. With the information does it still sound like the timing could still be off?

 

[stupidboy]

Yes, it does sound off. set the base timing with the vacuum line unhooked and then hook the hose up on a port that has no vacuum at idle but gains it as you increase rpm.

 

[broncnaz]

yes timing is either off or you have a vacuum leak somewhere and the increased timing is allowing the engine to idle better, Not tyying to rain on your parade but trying to prevent murphy from catching up to you.

 

[Ethansdad73]

i think he just did

 

[sprdv1]

Think positive.. ;D

 

[bmc69]

found out that the PO remove the in-line resister (with the help of Mr. Viper)

That was not a very nice thing Mr. Viper did, now is it??