Posi's Do-over

When I open the dashboard program for the Powerjection, I'm getting a blinking green light for the O2 sensor. The directions say I should get a green light, not a blinking light. I emailed Tech at Retrotek to ask them about this. Hope to hear back from them tomorrow. I went back through the setup program today for the Powerjection just to check it. Everything looks good except for that blinking light. I've checked, re-checked and dbl. re-cecked the firing order. Pulled all the plugs and re-gaped them to .040 Perfromance Dist. suggested .050 but that seemed too big to me.

 

Well hope its somthing small and cheap/free so you can start cruisin'.

 

Possible the muffler shop messed up the connection to or the O2 sensor itself?

 

Anything is possible. But the guy who did my exhaust has a lot of experience in the business (27 yrs). At this point I'd be happy if it's something as easy as a new sensor.

 

Hey John. Try not to get to bummed about it. The first time I got my injection running there were alot of bugs to work out. Your almost there. Just walk away if you get ticked off....cause when I don't I start breaking stuff. Sounds like your on track in finding it out. Probably the blinking green light. Everythings got to be just right on the fuel injection or it won't run right. Good idea to go back to original distributor too. Please keep us informed.

 

Thanks, Ryan. I'm going to start by checking the O2 sensor connection today and calling Retrotek about the blinking light.

 

Good Luck John,
I hope it is something easy to correct!

 

The O2 sensor appears to be OK. I let it run for about 1/2 hr today and the self learning part of the fuel injection seems to be.........well............learning. The tech from Retrotek got back to me right away and said the O2 light will blink for awhile until it gets warmed up a little. It also appears I was mis-reading the data coming in to the laptop from the Powerjection. I thought it was running rich and it turns out it's running really lean. I should be able to straighten that out tomorrow. That probably explains the incredible ping I've got that sounds like exhaust leaks. I started the day off intending to check out the O2 sensor first, but found a tiny puddle of gas under the Jeep. Turns out both of my fuel filters decided to start leaking. They are aluminum and can be taken apart to clean the screens. I didn't check them for tightness before I put them in and after a week of having fuel in them they both decided to start dripping. They were both buggers to get to as the screw-on ends take a 1" wrench and it was really tight getting to them. Pulled it off though..no leaky. You would kinda think they would come from the manufacturer already tightened well enough not to leak. Live and learn. Assume nothing!

 

I am sure this will get some eyes rolled at but could your fuel pump not be delivering the preasure the injection needs? Never delt with that sort of injection but i know on TBI 350's and the vortec's that if you start running real lean, it will do exactly when you have been describing. Even a couple PSI's in the south direction can take it below its threashhold.

 

No, I'm good on pressure. It's right at 45 psi at te fuel rail. Problem is mostly my own stupidity. The Powerjection unit configures the air/fuel ratio based on the torque value you enter on the computer. I thought it was giving me a rich reading when it was actually telling me it was lean so I kept moving the torque value the wrong direction. I think I may have figured out the exhaust leaks too. But I'm only good for admitting to one stupid thing per day!

 

I have mine set just a CH under 45 psi. Warloch, I know we are running different intakes, but I'm curious what you ended up with for a torque value. I started with 235 ft lbs and then went the wrong way (down) to correct what I thought was a too rich A/F ratio. I haven't had a chance to run it today.

 

Warloch: I just went back and re-read your thread re: the torque value you were at. Have you moved it from the 290 I read in your post?

 

I just want to say that Tech Support from Retrotek has been very helpful (along with you, Warloch) in helping me sort this out. They have responded to my emails very quicky, usually the same day.

 

Warloch; 310 seems to work well for me too. Were you able to get your idle down below 1000 rpms with the idle screws on the TBI or did you have to change something in the setup menu (idle cell)? I like to have mine idle around 600. I backed the idle adjustment screws all the way out and couldn't get the idle below 900. You weren't kidding about the sensitivity of the system to fuel pressure. My fuel pressure dropped to between 38 and 40 and it started to run like krap. As soon as I got it back up to 45 psi it smoothed right out. I may have figured out my exhaust leaks. It my be that the bolts I used to secure the exhaust manifolds are bottoming out in the block before they pull the manifolds in tight. Going to explore that tomorrow.

 

Sounds like you figured out the "engine running like krap" problem. Cool. Can't wait to hear about what you think of the powerjection unit. Enjoy your weekend.
Ryan

 

Thatnks guy. I did manage to get it running pretty good yesterday. I need to bleed the brakes before I can take it out and drive it. Not sure if that's going to happen today and we are supposed to get snow tonight!