[DeTomaso] final verdict on EFI

[Justin Greisberg]

Wow. They moved production offshore for the pj3 system from what I understand. My old pj1 does save the learned parameters fine. Your problems sound more frustrating than mine. Justin

On Oct 4, 2011, at 8:24 PM, Doug Braun <doug351c at gmail.com> wrote:

> Justin,
> 
> I feel your pain.
> 
> I'm still in the throes of fine tuning my Powerjection 3 system and encountered two separate hardware failures that both resulted in having to return the system to Professional Products for repair-replacement.  The first time, the wideband input circuit was faulty which I troubleshot by connecting another wideband sensor with no change in readings.  The symptoms were" the A/F ratio read 18:1 at idle with momentary spikes down to 12:1 but the exhaust smelled richer to me and the unit would not go closed loop. 
> 
> After I got the fixed unit back, it worked great until I realized that the replacement unit was failing to save the learned parameters at turn-off, but only when the unit was hot.  I discovered this problem by taking screen shots of the tune parameters and comparing the ECU's contents to the screen shots at the next turn-on.  The symptoms were: whenever I shut the unit down, while hot, and then tried to restart, it would be at 11:1 fuel ratio, stinking like mad, until the ECU learning process had time to correct it again.  Cold restarts were fine.  I don't know if your Powerjection 1 saves it's learned parameters at every turn-off like the Powerjection 3, but every time I shut it down with the PC connected, I can see the message, "Saving ECU parameters" which transfers the ECU's learned RAM contents to the Flash memory.  In my case, a bad timing capacitor in an RC shut-down timing circuit was causing the ECU to shut off right in the middle of the RAM to Flash transfer so the next time it started it would run badly unless I went back the to basic tune. 
> 
> At this point I'm waiting for the unit to return - they replaced the bad capacitor and FedEx is returning the unit as we speak.  I'll let you know how well it runs (or doesn't) after I get it back.  At this point, I would recommend people stay away from this brand until I use it longer and find it to be reliable and work well.
> 
> Doug  Braun
> blue 73L #5505 
> 
> On Tue, Oct 4, 2011 at 5:43 PM, Justin Greisberg <justingreisberg at hotmail.com> wrote:
> 
> i appeciate that it all should be logical and fixable, but the problem I am having is resistant to change.  Under part throttle acceleration, the AF ratio goes way lean and the car bogs.  bogs horribly and almost stalls.  cant drive in traffic.   I tried adding more fuel.  No change. I tried adding less fuel.  No change.  I changed the RPM MAP boundaries (whatever that means) to higher numbers for more resolution because I have a lower vacuum cam at idle, and that helped a little, but dont know where to go.  no one at the company can offer any more advice.  maybe something wrong in the system.  maybe something wrong in the software.  maybe something wrong with me.
> P.S.  I love the comment that "100% working fuel injection means works as well as a carb."  It is ironic that I started this project because my carb cars are hard to start after sitting for a while.  now I wish that was the only problem...
> justin
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