[DeTomaso] final verdict on EFI

[Pantdino]

Actually all my carbed cars start and run fine. What exactly is the point of going to EFI unless you want those last few HP or MPG? 


Jim

-----Original Message-----
From: Justin Greisberg <justingreisberg at hotmail.com>
To: Doug Braun <doug351c at gmail.com>
Cc: DeTomaso Forum <detomaso at realbig.com>
Sent: Tue, Oct 4, 2011 6:39 pm
Subject: Re: [DeTomaso] final verdict on EFI



Wow. They moved production offshore for the pj3 system from what I understand. 
y old pj1 does save the learned parameters fine. Your problems sound more 
rustrating 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 
ncountered two separate hardware failures that both resulted in having to 
eturn the system to Professional Products for repair-replacement.  The first 
ime, the wideband input circuit was faulty which I troubleshot by connecting 
nother wideband sensor with no change in readings.  The symptoms were" the A/F 
atio read 18:1 at idle with momentary spikes down to 12:1 but the exhaust 
melled 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 
eplacement unit was failing to save the learned parameters at turn-off, but 
nly when the unit was hot.  I discovered this problem by taking screen shots of 
he tune parameters and comparing the ECU's contents to the screen shots at the 
ext turn-on.  The symptoms were: whenever I shut the unit down, while hot, and 
hen tried to restart, it would be at 11:1 fuel ratio, stinking like mad, until 
he ECU learning process had time to correct it again.  Cold restarts were fine.  
 don't know if your Powerjection 1 saves it's learned parameters at every 
urn-off like the Powerjection 3, but every time I shut it down with the PC 
onnected, I can see the message, "Saving ECU parameters" which transfers the 
CU's learned RAM contents to the Flash memory.  In my case, a bad timing 
apacitor in an RC shut-down timing circuit was causing the ECU to shut off 
ight in the middle of the RAM to Flash transfer so th
e 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 
apacitor and FedEx is returning the unit as we speak.  I'll let you know how 
ell it runs (or doesn't) after I get it back.  At this point, I would recommend 
eople stay away from this brand until I use it longer and find it to be 
eliable and work well.
 
 Doug  Braun
 blue 73L #5505 
 
 On Tue, Oct 4, 2011 at 5:43 PM, Justin Greisberg <justingreisberg at hotmail.com> 
rote:
 
 i appeciate that it all should be logical and fixable, but the problem I am 
aving is resistant to change.  Under part throttle acceleration, the AF ratio 
oes way lean and the car bogs.  bogs horribly and almost stalls.  cant drive in 
raffic.   I tried adding more fuel.  No change. I tried adding less fuel.  No 
hange.  I changed the RPM MAP boundaries (whatever that means) to higher 
umbers for more resolution because I have a lower vacuum cam at idle, and that 
elped a little, but dont know where to go.  no one at the company can offer any 
ore advice.  maybe something wrong in the system.  maybe something wrong in the 
oftware.  maybe something wrong with me.
 P.S.  I love the comment that "100% working fuel injection means works as well 
s a carb."  It is ironic that I started this project because my carb cars are 
ard to start after sitting for a while.  now I wish that was the only 
roblem...
 justin
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