Just wondering if Dodge bothered to properly ground the throttle body on the 4th Gens or if it's like the 3rd Gens?

With our trucks this simple mod makes the idle 100% smoother and significantly enhances throttle response.

Just curious...

 

Read about this on the other forum yesterday. I was going to make up a cable today at work and maybe do it this weekend.

Anyone know how long it needs to be, and what size ring lug on the ends?

Thanks.

 

What symptoms does it correct ?

 

I did mine yesterday. Just ran a ground wire to the ground point behind the battery on the fender well. If any differance not sure I notice it yet. I was willing to try because mine does have a throttle lag at low speeds. Took about 15 minutes to do so it was worth a shot.

 

How long of a cable and how large was the ring lug?

 

Here's the link for the thread in the 3rd Gen section where all posted info is relevant. I know your T/B is not in the exact spot, but it's still all the same relevant info.
https://dodgeforum.com/forum/3rd-gen...ng-the-tb.html

 

I'm just very curious to know if the Ram engineers noticed/correctly this flaw when they designed the 4th Gens.

Extremely noticeable and beneficial on 3rd Gens with fly-by-wire throttle bodies. The TB in the 3rd Gens are grounded very poorly, resulting in a lag in throttle response and often times a very erratic idle. My idle would fluctuate a good 200 RPM and since grounding it you'd swear the tach needle was glued in place - it doesn't budge at all any longer. I've never had a stall at a red light or stop sign, but idle has dipped pretty close a few times. I know a LOT of 3rd Gen guys have the occasional dip in idle and actual do stall on occasion.

I've also noticed a slightly crisper throttle response since doing this basically free and very easy mod...

 

I read the Gen3 thread and was particularly focused on the NASA engineer explanation. What I gather is that some external EMI (Electro-Magnetic Interference) was affecting either the Throttle Positions Sensors, TPS1 and TPS2 (there are 2 on a gen4. I'm guessing the gen 3 uses the the same design), or the Throttle Position Control signal+, or it's return to the PCM. So grounding the TB provided for a path of this EMI to ground so that it kept it off the sense and control signals.

Was the Gen3 erratic idle there from the very beginning or was it something that developed over time? Maybe after an aftermarket mod was added? I can't imagine an erratic idle would go unnoticed very long and not fixed under warranty. Another way to get rid of EMI on signals, is to wrap a wire around a harness looping in 2-3 loops per inch the whole length of the harness you are trying to protect. Ground both ends of the wire and most EMI will be intercepted by this wire and conducted to ground before it affects the interface. Try this if you have time and remove the ground wire from the TB and see what happens. This method works on most interference problem.

I just looked at the gen4 interface and it seems that the design does not require a grounded TB to work. But then again, Chrysler did not provide any EMI protection to the harness.

Edit:

I forgot to mention that the Gen4 TB is mounted to the non-conductive intake manifold. There was no attempt to ground the TB. I used my ohmeter and measured an open to ground. This would seem to indicate a difference with the Gen3 as the other thread mentioned folks measuring some impedance to ground from their TB. If someone can get me the wiring schematics to the Gen3 I can do an analysis of it.

 

that's what I was thinking.. I took mine off a while ago and cleaned it. You do not want to crank the screws/bolts back on when reinstalling since it appeared to be plastic and will strip out.

 

There is usually a "baked in" threaded insert in these manifolds. So when you took your TB off there wasn't one in? That would be a ****ty design if that's the case.