Stumble stumble

[Rox Crusher]

My new 351w now has 6000 kick ass miles on it. It runs very nice and I love the sound and feel.

Meanwhile, I continue to have an irritating stumble that I can't solve.

It only happens between 2900 - 3300 rpm. I have a digital tach which I have been watching very close and the stumble is very consistent and predictable within the range I mentioned. I'm not sure stumble is the right word. It's more like a series of dead spots within that range. When it "stumbles" it's kind of like the ignition goes completely dead for a nano-second and then right back to good.

I have good fuel pressure and the spark plugs look good. No codes on the computer either.

I thought it could be dead spots in throttle position sensors but I swapped in my spare tps sensor without solving the problem.

So, let's hear your ideas and recommendations and actions !

[landshark]

Coyote

[horseplay]

Sounds like a possible pickup sensor

[Rox Crusher]

Sounds like a possible pickup sensor

Cam position sensor ?

[Digger]

Do you have a Knock Sensor?

[ZOSO]

Sounds like a possible pickup sensor

Cam position sensor ?

That doesn't do much. But it may be a possibility or the crank position sensor.

[Rox Crusher]

It's all Explorer stuff.

So no knock sensor that I'm aware of.

[horseplay]

I would check the integrity of all the cam position assembly from connector to drive gear.

[ZOSO]

these are the same injectors that were on the 302 right? I wonder if you have a bad one somewhere.

[Rox Crusher]

these are the same injectors that were on the 302 right? I wonder if you have a bad one somewhere.

Nope, this are different injectors. Refurbished 17lbs with returnless rail set up

[ZOSO]

these are the same injectors that were on the 302 right? I wonder if you have a bad one somewhere.

Nope, this are different injectors. Refurbished 17lbs with returnless rail set up

hmm. is it under load or does it do it free revving?

[Rox Crusher]

these are the same injectors that were on the 302 right? I wonder if you have a bad one somewhere.

Nope, this are different injectors. Refurbished 17lbs with returnless rail set up

hmm. is it under load or does it do it free revving?

I believe it does it free revving. I'll confirm it in the morning in front of my Prius neighbor's house

[ZOSO]

If it does stick a timing light on each plug wire. Then also open the injector harness and do each injector. It should pick it up if it's one of those.

[Rox Crusher]

Just getting back to planet Bronco after two long weeks of business travel.

I wiggled all the cam position wiring / connectors and problem remains.

Sounds like I need to check gear and then move on to plug wires and injector wires, etc