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#4107620 - 05/05/21 02:57 AM Converting DBW to Drive by Cable, is it possible?
BrainIsSlow Offline
n00b

Registered: 03/19/21
Posts: 48
Loc: Arizona
Can I throw a mechanical throttle body from an 04' or older on my 2011 P7B and tune it to work, or will I need a new ECU/PCM?

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#4107650 - 05/05/21 02:49 PM Re: Converting DBW to Drive by Cable, is it possible? [Re: BrainIsSlow]
RF_Overlord Offline

Poobah

Registered: 12/14/02
Posts: 7605
Loc: MA
Not positive having never done this, but I do know the pedal position sensor provides feedback to the PCM, so if the PCM doesn't see the expected input, it's go into limp mode at the very least.

With the introduction of DBW, the PCMs changed position and went from 1 plug to 3, so I think it would be a wiring disaster to try to install a pre-DBW PCM into a DBW car.

EDIT* Upon further reflection, I suppose you could adapt the Pedal Position Sensor to a an '04 pedal assembly and keep the current PCM, but this sounds like a lot of ifs for little gain.


Edited by RF_Overlord (05/05/21 02:53 PM)
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#4107668 - 05/05/21 06:53 PM Re: Converting DBW to Drive by Cable, is it possible? [Re: RF_Overlord]
BrainIsSlow Offline
n00b

Registered: 03/19/21
Posts: 48
Loc: Arizona
I'm looking for a snappier throttle.

Can I avoid limp mode if I just modify the parameters with a tune? I feel like it can be done if you can tell the pcm to SHTFU and mind its own d*mn business 😂😂

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#4107672 - 05/05/21 06:56 PM Re: Converting DBW to Drive by Cable, is it possible? [Re: RF_Overlord]
BrainIsSlow Offline
n00b

Registered: 03/19/21
Posts: 48
Loc: Arizona
I'm so glad the government can steal my money every week so they can pay idiots in suits to make bogus emissions laws without ANY idea what they're talking about. DBW is the 2nd worst thing to happen to the crown victoria.

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#4107714 - 05/05/21 11:44 PM Re: Converting DBW to Drive by Cable, is it possible? [Re: BrainIsSlow]
2007CrownVic Offline
Over the Hill

Registered: 11/19/11
Posts: 3197
Loc: Canada
There's nothing wrong with DBW if it's working properly. There's just more to go wrong with the extra electromechanical bits involved compared to a normal throttle that you only need to keep clean and easy to find problems with. Abuse from being on a P7B don't help either.

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#4107718 - 05/06/21 12:13 AM Re: Converting DBW to Drive by Cable, is it possible? [Re: BrainIsSlow]
Davidzq Offline
Climber

Registered: 01/19/15
Posts: 512
Loc: Seattle, WA
Try recalibrating your pedal position sensor.
https://www.crownvic.net/ubbthreads/ubbthreads.php?ubb=showflat&Number=4019500


A proper tune (especially one from Marty Ochs of MO's Speed Shop) will eliminate almost all of the lag.
Further reductions can be attained by swapping in a larger throttle body.

Trying to revert to a cable throttle would cause more issues and be more work than provide any benefit. There's a reason no one has actually done it, though many people have looked into it (and ultimately decided against it).
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#4107724 - 05/06/21 12:52 AM Re: Converting DBW to Drive by Cable, is it possible? [Re: Davidzq]
BrainIsSlow Offline
n00b

Registered: 03/19/21
Posts: 48
Loc: Arizona
I'll shoot him an email tomorrow

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#4107756 - 05/06/21 09:04 AM Re: Converting DBW to Drive by Cable, is it possible? [Re: BrainIsSlow]
White Falcon LS Offline


Posting Addict

Registered: 01/01/02
Posts: 19126
Loc: SoCal
Converting to a traditional cable setup from an electronic throttle body would be much more hassle than it is worth. You have to remember, apart from pointless government regulations, the shift to electronic throttle control also eliminated the need for a separate IAC valve and cruise control module. It probably cut production costs to some extent as well, which I would imagine, was the main drive behind it.

At a bare minimum, apart from a new throttle body and TPS, you would also have to replace the intake plenum with one from a older vehicle. Then you'd have the joy of replacing the gas pedal (and maybe the entire pedal assembly if you have adjustable pedals), fishing the throttle cables (which may or may not require drilling), and of course a good bit of rewiring. If you can't modify your existing zip tube to accommodate the IAC, you may need to replace that as well. If you want functioning cruise control, not only would you need to install a module, but you'd have to rewire the entire system and probably go as far as replacing the clock spring in the steering column, and perhaps even the steering wheel if you cannot get the '05+ controls to work.

Simplest way forward, and the cheapest, will be the tune option from Marty.
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#4107758 - 05/06/21 09:27 AM Re: Converting DBW to Drive by Cable, is it possible? [Re: White Falcon LS]
Old_Guy_Stu Offline

Over the Hill

Registered: 04/28/19
Posts: 2418
Loc: Cleveland, OH
Originally Posted By White Falcon LS
It probably cut production costs to some extent as well, which I would imagine, was the main drive behind it.


That, and emissions. DBW holds the throttle open instead of snapping shut and momentarily spiking the mixture when you let off the pedal. Which you do because, you know, you'd like to actually slow down.
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