http://www.chevytalk.org/fusionbb/showforum.php?fid/35/Recent EFI/Fuel Injection and Engine Control Systems posts.enFri, 24 May 2013 03:05:02 GMTFri, 24 May 2013 03:05:02 GMThttp://blogs.law.harvard.edu/tech/rssFusionBB 2.1 (www.fusionbb.com)012Sundayhttp://www.chevytalk.org/fusionbb/showtopic.php?tid/297783/http://www.chevytalk.org/fusionbb/showtopic.php?tid/297783/Thu, 23 May 2013 13:32:21 GMThttp://www.chevytalk.org/fusionbb/showtopic.php?tid/297629/http://www.chevytalk.org/fusionbb/showtopic.php?tid/297629/Sun, 19 May 2013 20:58:09 GMThttp://www.chevytalk.org/fusionbb/showtopic.php?tid/297540/http://www.chevytalk.org/fusionbb/showtopic.php?tid/297540/Fri, 17 May 2013 14:53:24 GMThttp://www.chevytalk.org/fusionbb/showtopic.php?tid/297518/http://www.chevytalk.org/fusionbb/showtopic.php?tid/297518/
In a nut shell, the car no longer starts. let me give you some background but I warn you this will be a long post.

The Car is a 71 chevelle with a 408 ls3 style motor. LS3 intake and injectors, LS 58x/4x crank and cam triggers installed in the stock relationship. cable throttle body. Being controlled with the Holley HP EFI. This is a new installation with only a few hours of run time.

During my initial startup attempts with this new engine I found that the cam sensor was not sending a signal (viewed on system log). Further inspection found that the cam sensor connector was miss-wired iaw the holley wire diagram. I re-pined the cam sensor connector and the engine then fired right up. Idle and cruise tuning then commenced without major issue.

For a couple of days the engine was running very nice then the problem began. I first noticed an occasional misfire during light cruise. This quickly progressed to a nearly constant misfire during light cruise and attempts to open the throttle were met with pinging and hesitation.

I reloaded a fuel map that had worked well from the previous day and turned off closed loop and learning. Engine still misfired bad, misfire was now bad at idle also. During one start attempt the engine would not fire and I noticed the "tens digit" of "daig #1" was counting up and the RPM failed to sync during the failed start attempt.

I recorded several system logs and it seems like the crank and cam sensor signals are present and well defined. The engine then started again but ran very poorly (felt like a random misfire).

I pulled the plugs and they indicate a rich condition. plug wires are good. New plugs go in and another start attempt made. Engine will not start, "diag #1" shows the tens digit counting and rpm will not sync. System log shows cam and crank signals are present.

I tried to run the car with out the cam sensor but im not sure I have it set up correctly for that. Crank was selected as LS-58x, cam was none. I tried coils as DIS waste fire and as DIS coil on plug, injectors were set to bank to bank.

Engine will still not fire.

Is it possible the cam sensor is bad even though the system log shows the signal present?

Is it possible the HP EFI computer is damaged due to the sensor miss-wire?

Im lost here. I can Email a system log and data log. ]]>Thu, 16 May 2013 22:02:05 GMThttp://www.chevytalk.org/fusionbb/showtopic.php?tid/297327/http://www.chevytalk.org/fusionbb/showtopic.php?tid/297327/
Other than that are there any oem alternatives that are close?

Another thing to allow for is post to Australia as well if possible.

Thanks
Glenn ]]>Mon, 13 May 2013 04:40:42 GMThttp://www.chevytalk.org/fusionbb/showtopic.php?tid/297285/http://www.chevytalk.org/fusionbb/showtopic.php?tid/297285/ I was on a site for BBF's when I found a thread about an EFI project.
THIS is where Danny comes in. He had modded his AirGap intake to fit Injectors! I began researching and scrounging mostly OEM parts for this project. BUT, the OEM intake for an EFI engine will not fit the older heads, I decided to mod my Edelbrock Performer intake that came on the engine. I finally got off my azz and got out to the garage and welded up the runners for machining. I got a complete '93 EFI V8 engine harness with ECU from the same style car I have. I have come accross several threads in my research. One where the owner put an EFI engine in a Pantera. I decided to use his work for a basis in my project. Use a Cam Synchronizer and EDIS 8 crank trigger to replace the TFI distributor that would normally be used.
My current boggle is, did the EFI 7.5l have knock sensor(s)? I haven't found any data on that. I know that the SBF that the harness and ECU came off did. Would it work on the BBF? If so, where would I put it? Anyone out there know? Thanks, This site has a lot of great reading.
MikeH ]]>Sun, 12 May 2013 04:44:29 GMThttp://www.chevytalk.org/fusionbb/showtopic.php?tid/297259/http://www.chevytalk.org/fusionbb/showtopic.php?tid/297259/ Heres the things I changed
went from a 2wd street truck to a 4wd mudtruck, 4-link, coilovers, 2.5 ton axles, np200 transfer case, 52" tactor tires,just over 9ft. tall
the turbo 350 got replaced w/ turbo 400 w/ stage 3 shift kit- so now that vaccum line that went from tranny to trottle body no longer is plugged in.
I tripled the water copacy by adding an oversized radiator w/dual fans in the bed along with plumbing from block to bed, so dont know if the computer was trying to fight itself when the water temp wasnt coming up the way it was use to.
I went from a 2 chamber exhaust system by flowmaster to open headers, I was able to reuse the pipe and cut and weld back 2ft. of pipe w/ chrome tips giving me around 3ft. pass the collector where the NBo2 sensor is, which I changed the degree of the sensor went from 2 0'clock to 11 o'clock
And I went from a Holley Air cleaner assembly to a custom air box w/ 4" intake tube w/ filter.

The motor was not run for 4 months while the truck was being built to a mudtruck, so I dont know if something might of went bad or if one or all the modifications I did might be causing the problem.

The other thing is I have no knowledge of how to tune or trouble shoot with the pc on figurung out the problem. I got a buddy that has been helping me to get it to run on its own without giving it throttle, we unplugged the IAC adjusted the idle set screw and got it to idle at 800rpms, it does hesitate in drive upon giving it throttle but once its up in rpms it seems to run and drive fine as much as I can tell in a mudtruck with tractor tires.
Also the other day we had the pc plugged in and my buddy was able to go in and changed the setting to open loop to see what it would do, it idled ok for a few but then shut off by itself, that was before we unplugged the IAC, never did change it back from open loop, so I'm guessing that might be contributing to the problem cause I still using the NBo2.
Again a novice here,Thanks for any and all help in the matter.
]]>Sat, 11 May 2013 17:45:54 GMThttp://www.chevytalk.org/fusionbb/showtopic.php?tid/297198/http://www.chevytalk.org/fusionbb/showtopic.php?tid/297198/ Thanks for any help. ]]>Fri, 10 May 2013 01:00:18 GMThttp://www.chevytalk.org/fusionbb/showtopic.php?tid/297173/http://www.chevytalk.org/fusionbb/showtopic.php?tid/297173/ Do you know if the CAN output present in C950 WB02 GenIII module can be used in future with HP EFI?

Maybe you will tell me to contact Holley, but maybe you must know something... ]]>Thu, 09 May 2013 15:08:09 GMThttp://www.chevytalk.org/fusionbb/showtopic.php?tid/297039/http://www.chevytalk.org/fusionbb/showtopic.php?tid/297039/
I changed yesterday from c950 to HP in my wifes Mustang (with Chevy 388 engine).
And it worked from the beginning. The basemap delivered from Holley was very good.
Now Im eager to optimize the spark map too.
The engine is a 1975 block with E-tech heads and
a retrofit solid roller cam. I dont know where to locate the 2 Knock sensors. is it possible to locate them in front of the heads where already threads are existing ?

regards

Davidpower
]]>Mon, 06 May 2013 08:35:46 GMT