Georgia Fiero Club Forum

All Things Fiero => General Fiero Discussion => Topic started by: GTRS Fiero on October 12, 2017, 05:49:13 pm

Title: Digital EGR swap
Post by: GTRS Fiero on October 12, 2017, 05:49:13 pm
I have everything to do mine, including DIS, but just don't have the funds to pay someone to do it.

I didn't want to clutter the other thread, but how much does it cost to have this done?
Title: Re: Digital EGR swap
Post by: Fierofool on October 12, 2017, 06:03:50 pm
I talked with phonedawgz a year or so ago and just the harness was about $150 and I think he said he was giving me a break on that.  Then there's the ECM tuning and installation. 
Title: Re: Digital EGR swap
Post by: GTRS Fiero on October 12, 2017, 06:06:47 pm
I thought f85gtron did the ECM tuning and install for the 7730.
Title: Re: Digital EGR swap
Post by: Fierofool on October 12, 2017, 06:09:26 pm
He has done them, but I would expect his prices to be equivalent. 
Title: Re: Digital EGR swap
Post by: TopNotch on October 12, 2017, 06:10:45 pm
If I was going to do it, I'd borrow the ROM from the ECM of someone who's already done it, get a blank chip, and copy it. I might need a little tweaking after that, but it'd be a good start.
Title: Re: Digital EGR swap
Post by: GTRS Fiero on October 12, 2017, 06:11:07 pm
You need to find something to trade.
Title: Re: Digital EGR swap
Post by: Fierofool on October 12, 2017, 06:15:41 pm
BTW, anyone doing the conversion to DIS, I have an extra oil pump drive given to me by Brian Walsh of Capital City Fiero Club.  It's going at my cost.  Free.
Title: Re: Digital EGR swap
Post by: GTRS Fiero on October 12, 2017, 06:20:34 pm
Um, oil pump drive?
Title: Re: Digital EGR swap
Post by: Fierofool on October 12, 2017, 06:26:15 pm
It replaces the distributor when you go DIS. 
Title: Re: Digital EGR swap
Post by: GTRS Fiero on October 12, 2017, 06:27:08 pm
Hmmm.  I thought it was plugged, or something.
Title: Re: Digital EGR swap
Post by: Fierofool on October 12, 2017, 06:29:53 pm
It's just the lower end of the distributor with the cam driven gear.  The top portion of the distributor has been replaced with a similar piece that has the O-ring seal and is plugged.  I'll take a picture and post it in a moment. 
Title: Re: Digital EGR swap
Post by: GTRS Fiero on October 12, 2017, 06:45:35 pm
I provided the adapter, the digital EGR, the EGR tube, and the gaskets.  The contract for labor, wiring/pigtails, ECU, bracket, coil pack/ICM, programming, and whatever else ran me about 3x what you quoted.

Of course, you get what you pay for.  Time and cost are inversely proportional, right?
Title: Re: Digital EGR swap
Post by: Fierofool on October 12, 2017, 07:05:02 pm
I have everything needed for the conversion.  ECM and tray, pigtails, EGR, crankshaft sensor is in the block, oil pump drive.  Only thing I need to purchase is the knock sensor.  I got the ECM and pigtails and EGR at Pull-a-Part.  Probably less than $50 total.  Cowspatoot gave me the ECM tray.  Olejoedad's son, Brian, gave me the oil pump drives.  I have the engine's original crankshaft sensor still in the block.  The coil pack, ICM, and spark plug wires are also from my 3.4.  All I need to purchase is the knock sensor. 

Title: Re: Digital EGR swap
Post by: GTRS Fiero on October 12, 2017, 07:26:33 pm
The oil pump drive didn't come with the 3.4?
Title: Re: Digital EGR swap
Post by: Fierofool on October 12, 2017, 07:35:56 pm
It did.  It was a complete engine, but at the time I had no plans to convert.  I tried to sell all the parts from the 3.4, but no one ever bought anything except for the lower intake manifold.  They had stripped out or broken something on their Formula and couldn't locate a Fiero lower intake.  I tossed most of the mounting brackets, exhaust manifolds, all the hardware.  Only kept the lower intake, alternator, and starter.  I eventually sent the aluminum parts out in my recycle bin.  Traded the starter as a core for a new Fiero starter. 

My 3.4 as I started to strip it down.  It was a complete pull out engine.

Title: Re: Digital EGR swap
Post by: GTRS Fiero on October 12, 2017, 07:38:51 pm
It's fairly clean.

What is the benefit of a digital EGR?
Title: Re: Digital EGR swap
Post by: Fierofool on October 12, 2017, 08:03:16 pm
The Fiero's electro/pneumatic EGR system is prone to problems in part due to age, and reliable EGR solenoids are hard to come by.  They aren't made any more, though some later versions can be modified to work on the Fiero.  The digital valves are/were widely used on GM cars.  The Fiero system consists of 2 parts.  The solenoid and the valve.  The digital EGR combines both into one and is efficiently controlled by the superior 7730 ECM.