Running rich?

 
Dfi is running rich and fouling the plugs? 

I'll suggest the most likely culprits are sticking injectors. Don't know the history here but if it's been laid up for a loooooooong time, I would look there first.

Hi Hoganter,
I'll be watching this thread as I am about to pull the throttle bodies so I can check out the injectors on my '85 Voyager. The service manual has a routine that is suggested for cleaning the injectors it involves a 12v light bulb and a 12v battery in series with the injector.
You can download the service manual from the bottom of the home page for this site.
Bill/KZQ

I cleaned the injectors in an ultrasonic cleaner and tested them visually.
I would like to install new injectors but it's not straight forward to do that.
I have changed the fuel pressure valve from a variable back to the original with no real change.
When I was adjusting the variable I was not getting any real change in running. 
It runs well just before it dies when you turn the fuel off, so I am going to test the inputs again to the ecu. 
I replaced the injector loom with a new one so may have confused her if its wired incorrectly.
Will check engine temp, air temp and throttle position ( again and again) as is the way with these things.
I now have access to a new oscilloscope ($10k) so can check signals with that. 
Will advise if I find anything
Cheers
 

I replaced the injector loom with a new one so may have confused her if its wired incorrectly.

 

First question to ask is... what did I do last?

10k o'scope.. wowzer. I thought $750 was huge for my little table guy.. 


Please keep us posted. At least know I'm very interested. I don't have any DFI kz's but might someday...

Don

Testing injectors can be performed with minimal cost.. 
The cheapest way is to buy some large storages from Amazon, some tubing, and a 9 V battery.
Fill the syringes with fuel, energize the solenoid with the 9 V battery, press the plunger on the syringe, look at the spray pattern.
Do that for all six, and see how they compare.

I bought this little guy, relatively cheap money. I think it was like 50 bucks and produces a wave form to the injector. You can control the frequency and amplitude of the square wave.


I did this on my Yamaha FJR 1300 and determined I had several injectors that were clogged. I sent them to RC engineering where they were rebuilt, tested, and flow rated.

I actually got together with several other FJR owners and we sent 32 injectors. I personally had 12 injectors cleaned. RC engineering produces a flow chart for each injector. 


On a sidenote, I was talking to an engineer at the nuclear plant who used to be a injection engineer. He said the tolerance was -15% flow. Seems like a lot.