Big Gay 2F Build Tech (9 Viewers)

[matt.mcinnes]

Few have taken the time and effort to rebuild a 2F and balance it. For those that have it's no disappointment. In fact it opens your eyes and is always more than you expected.

Too many people under estimate the 2F and go straight to a V8.

First class work sir

Time to drive and enjoy

 

[kvanoort]

Congratulations! I've been following your build thread and enjoying the gayness!

 

[tlc_4play]

When I rebuilt my 2F I had it dynamically balanced - I'm still waiting to fire it up as the rebuild is still ongoing - but I'm glad its not a disappointment

 

[ken_79-fj40]

I've been following this thread for quite a while too. My 2F is in need of a rebuild and I was really waiting to see the outcome of this before deciding which way to go (V8 vs. built 2F) and I have to say seeing that video has made up my mind. I can't wait to see what kind of numbers big gay puts to the wheels.

 

['69 Yota]

Wow Marshall. That thing sounds awesome. Good job.

 

[TOBASH]

Looks like your gonna have trouble up hills. Seems underpowered.

Wish you mounted the camera 12 inches higher, but looks really awesome. Sounds solid too.

I would say this is a real "He-Man's" car, but for the fact that you feel it is Ghey. They refer to most cars and vehicles as women. I guess your's is just trapped in a guy's bod.

BTW, what does UC and UC VP stand for?

Best,

T

P.S. most of us are jealous of your FJ

 

[bad_religion_au]

this makes me miss my 2f

 

[Southeast Overland]

BTW, what does UC and UC VP stand for?

UC = Upstate Cruisers

UC VP = Upstate Cruisers Vice President

Don't forget about the Token Chef

 

[3doghouse]

Impressive and inspiring!

Thanks for taking the time to share it with us.

 

[4x4 Station Wagon]

What you can't be done. Where is that hood scoop you mentioned!!!!

 

[Trollhole]

What you can't be done. Where is that hood scoop you mentioned!!!!

I'll never be done. There is always something I can do to improve it.

TBI stuff

I've got a rich code. AFI who did the programming said they were gonna use the programming for a stock 2f and that they would work with me to get it correct considering this is not a stock 2f. Displacement has changed, cam specs among other things.

SO I have gotten a rich code. AFI sent me a ALDL cable and WIN ALDL software to read the data coming off the sensors and errors coming out of the ecu. I'm new to all the new data and this whole process but I have learned a lot in the past couple days and am looking forward to learning a lot more.

Note this is a screen shot of some of the data. There is a lot. Some that makes no sense to me, yet. Also my Alt decided to do some welding to it's internals so I'm running on battery alone. Though I have come to realize it will still run on battery power for quite a while even at 10v. Eventually you can hear the IAC shut down. Idle air control is basically a valve that lets air bypass the TBI butterflies to control idle air as well as some other metering functions. When it's open it sounds like a big air leak. WHen this happens you have about 5 min before the fuel pump is going to start to shut down. With one battery I was able to drive it 4 hrs back through the mountain with about an hr of having to use the headlights. So the TBI system doesn't use nearly as much power as I thought it would.


The 0's and 1's from what I can tell to the right are basically switches. 1 for on and 0 for off.

 

[imnaha16]

Anyone tried to get parts anadized and dyed?

 

[cruiserbrett]

It looks like you are getting a rich code at near idle speeds, based on the TPS postition and the low BLM at those posititions.

make sure the injectors are actually firing, as opposed to firing and leaking by. you can use a timing light hooked up, but aimed at the TB to see this. Have you checked fuel pressure? Many generic EFI pumps can put out enough volume at 45 psi to actually cause the 14psi-ish regulator to be overworked keeping the psi down to 14. Also make sure there is no restriction on the return.

 

[Trollhole]

It looks like you are getting a rich code at near idle speeds, based on the TPS postition and the low BLM at those posititions.

make sure the injectors are actually firing, as opposed to firing and leaking by. you can use a timing light hooked up, but aimed at the TB to see this. Have you checked fuel pressure? Many generic EFI pumps can put out enough volume at 45 psi to actually cause the 14psi-ish regulator to be overworked keeping the psi down to 14. Also make sure there is no restriction on the return.

Good stuff. Revamped the fuel return cause I did have a fuel restriction (stupid poly tank) But this was taken after that. I rebuilt the fuel regulator. Pressure is good. I think my next step is to rebuild the injectors since they probably were used pretty hard in the prior vehicle.

 

[joeyg1973]

I gotta find the website in my unorganized fuel injection bookmarks, but I got 2 rebuilt ones for 50 bucks over the web. When I find that link I will post it here.

 

[cruiserbrett]

with regards to the vehicle the injectors came from, was it a 4.3 or a 5.0/5.7? *Most* calibrations for the TBI 2F's .bins are designed around the flow rate of the 4.3L injectors. If you had 5.0/5.7 injectors the flow rate IIRC is higher, which would cause it to run rich as the computer would expect he flow rate of the 4.3 injectors for the prescribed opening time, where the actual flow rate would be of the higher rate, there fore introducing more fuel for a given period of time... Double check your injector P/N and ask AFI what flow rate they calibrate for and see if your injectors are up to par.

Ideally your BLM should be 128. that means that the computer is not enriching or leaning out the fueling. Some fluctuation is normal, but there are caps: IIRC 90 is the most the computer can lean it out, and IIRC 150 is a rich as it can go, even if the o2 sensor wants more adjustment.

If you have a realtime ALDL link you can watch the BLM fluctuate. I would say a chip that was in good tune for the 2F would need no more than +/-10... This BLM is the inputed to the "learn" function of the computer, so the closer you get it to 128 steady, the less re-learning the computer will have to do if memory is lost.

 

[FLYINGLOW]

Heres a link for identifying your injectors: http://www.diy-efi.org/gmecm/component_info/tbi_injectors.html

 

[malcb]

I don't know your system but the ECU is probably adjusting (increasing) the open time for the injectors if the battery voltage is as low as 10V, at idle that might throw up codes.

 

[Trollhole]

Same thing with 14.4 volts.

It's a 4.3 TBI out of an Astro van.

 

[joeyg1973]

Here is where I got my rebuilt injectors from.

TBI Injectors: Find TBI injectors at Motor Man Fuel Injection Supply