Another quest ….

[Turdle]

Al
Take your vacuum reservoir globe off, and shake it. Mine had water in it, and I am hearing of it more and more.

 

[aldive]

Al
Take your vacuum reservoir globe off, and shake it. Mine had water in it, and I am hearing of it more and more.

What and where is such a device? I have never heard of it.

 

[Turdle]

What and where is such a device? I have never heard of it.

Should be a black globe, in front passenger wheel well, behind the corner light
It will have 2 hard vacuum lines coming from it

It is used for vacuum pressure to drive the HVAC-vent function-blend door

 

[aldive]

Is that only on the V8s? I don't have anything like that.

 

[Turdle]

I didn't think so??
tell you what
search vacuum reservoir, I'll start from last pages-you from first, I'll post if I find something definite.

 

[Turdle]

Going to look at chilton's cd right now

 

[jamester_a]

Spark in the dark....?

No, not a Quest for 40 ( or more ), but a quest to get a perfectly smooth idle on my 4.0 SOHC motor.

The 4.0 SOHC is infamous for a somewhat “irregular” idle. And it drives me crazy.

Before I outline what I have done so far in this quest, please, let’s discuss potential causes and remedies.

Look forward to your input ….

Al,

I'm sure you have done this already, but just in case - have you looked for arcing under your hood in the PITCH black - especially around the plug wells? I had an ever so slight wobble at idle on my OHV that was driving me crazy which was caused by carbon tracks down two wire boots. I could see ever so FAINT arcing around those two holes and only at idle for some reason. It took a long time to get my eyes to see it consistantly. I had a set of old stock wires lying around and used them to replace those two and voila - annoyance gone. The problem was the boots, but even when I pulled them I really could not see anything until I put them under a magnifying glass. (And yes I had an appropriate thin layer of di-electric sealing those boots on the plug shaft)

Just a thought. (A shot in the dark one might say)

- James

 

[aldive]

James, thanks for the suggestion, however, I have done this several times; no sparking.

 

[Doubt Incarnate]

maybe its related to your smaller lighter underdrive crank pulley. less mass to absorb the lumps in engine operation so you can actually detect each cylinder firing.

 

[aldive]

maybe its related to your smaller lighter underdrive crank pulley. less mass to absorb the lumps in engine operation so you can actually detect each cylinder firing.

Its been that way since the truck was new, before any mods.

 

[aldive]

I didn't think so??
tell you what
search vacuum reservoir, I'll start from last pages-you from first, I'll post if I find something definite.

Jon, did you find anything? I didn't.

 

[boominXplorer]

On my truck its right under my airbox. Its tucked in there pretty well from the factory. Mine has been relocated or I would take a pic for you.

 

[Turdle]

Nope
Nothing definite.
New thread????

 

[aldive]

It MUST be a V8 thing.

 

[Turdle]

On my truck its right under my airbox. Its tucked in there pretty well from the factory. Mine has been relocated or I would take a pic for you.

Mine has a tire scuff also

 

[aldive]

New thread????

Sure, give it a go. Maybe we will learn something.

 

[Turdle]

Sure, give it a go. Maybe we will learn something.

Your question, your thread

I know where my ball is

 

[Turdle]

Back on topic, I do have a thought, just hit me in neighbor's garage.
They have 2 Harley's, which they have professionally gone through once a year. They come home idling smooth, which they fix by "leaning" the idle------
Think you and Doug could play with this???? maybe richen it a bit at idle.
Shouldn't hurt the other quest much???

 

[aldive]

Your question, your thread

I know where my ball is

Done.

http://www.explorerforum.com/forums/showthread.php?p=1541096#post1541096

 

[joefnh]

AL, I have been looking at both the smooth idle issue and MPG for about 2 years now. This weekend I installed a MSD capacitance discharge DIS-4 ignition controller. After installation I immediately noticed a near perfect idle.
Since the truck was new I have had a poor idle which has not responded to new plugs wires or some of Doug’s magic at tuning. The immediate impression of the mod is as mentioned, the smooth idle and a quite notable increase in throttle response and overall power throughout the RPM range,

Just a quick summary the MSD DIS-4 ignition controller modifies your spark in 3 important ways.

1.) Increases the energy of the spark from the factory design of aprox 80 millijoules to ~115 millijoules per spark.

2. Increases the number of sparks per cylinder firing from 1 to as much as 12. This allows for a constant spark cycle during the entire 20 degree fuel burn cycle. At RPM's around 3000 you will be back to 1 spark per ignition due to the speed required at 3k RPM. At around 2000 RPM you will average 9 sparks per cylinder firing cycle.

3.) Supply a constant 115 millijoules per spark due to the capacitance discharge technology. A majority of the ignition systems are inductive discharge type, that with increasing RPM's you will get decreasing spark energy.


Overall my goal was to achieve an increase in MPG, but given the near perfect idle I thought I would post it in this thread.

--Joe