Chevelle EFI install...

[Yelcamino]

Since it's been a while, I thought it was time to post an update...

So far I have the intake installed, the harness, gas tank, fuel pump, and fuel pump speed controller installed. I'm actually making progress!

Because the EFI computer is freakin' big, the only choice I had was to give up my glove box and make a new home for the computer. It's a pretty good fit, keeps it out of harms way, and I have relatively easy access to it.



Here's the engine with the intake on. In this picture I haven't finished routing the harness but it looks better now. So far I think my only complaint about the Mass Flo system is the harness is pretty bulky. It's simple, but there's a lot of it. I guess because it's "universal" it has to have a lot of extra length to accomodate all possibilities. I ended up cutting about 4 feet off the wires for the coil! Where did Mass Flo think I was going to put the coil, in the trunk?



I mounted the fuel pump speed controller in the trunk. It turned out to be a pretty good place for the wiring.



And the fuel pump and pre/post filters are mounted on the Rick's tank. I added the 3/4 x 3/4 square tubes for the filter brackets.



I still have a list of things to do, like finish the underdash wiring, run the fuel pump "on" wire back the speed controller, and finish hard lines from the tank to the engine.

[Motown 454]

It looks great nice work. Thats a nice thing about the stainless tank you can weld the brackets on and not worry about recoating the inside to prevent rust.

[My427stang]

Awesome, mine is all together too, just need to modify the harness a bit and mount the ECM.

Unfortunately, looks like I didnt get it done in time, the AF wants me to go on the road for a bit.

We'll get it though, just a bit later than you. Very nice work

[Yelcamino]

It looks great nice work. Thats a nice thing about the stainless tank you can weld the brackets on and not worry about recoating the inside to prevent rust.

Thanks! Stainless is nice to work with. However, I don't think I like how low the new tank hangs below the bumper. I think the only solution will be to paint it black to tone it down some.

[Yelcamino]

Awesome, mine is all together too, just need to modify the harness a bit and mount the ECM.

Unfortunately, looks like I didnt get it done in time, the AF wants me to go on the road for a bit.

We'll get it though, just a bit later than you. Very nice work

Thanks! You'll be back before you know it and then you'll be able to finish it up.

[Yelcamino]

Ok, it's done. The EFI is installed and it's running. I haven't had a chance to drive it much but it seems to run pretty good. I still have some small adjustments to make but I'm pretty happy with it so far.



Try to ignore the big orange line on the left. That's the only heat shielding I could find locally and I needed something to protect the fuel supply line.



Here's the Rick's tank. You can see how low it hangs...



In addition to the EFI, I also swapped the Sparco's for a pair of Kirky road race seats.



Of course, a full report isn't complete without a little video clip!

[camcojb]

looks and sounds great Herb. DEI has the same covering in black.



Jody

[TT302Z28]

This is very cool. I have been working with Mark Romans to create a crank trigger and a bracket using some MSD and LS parts for 1st gen BBC. This will allow for the use of the LS computers and a 24 tooth reluctor wheel.

Want to move to EFI on my 496. I believe there is a lot more power once timing and fuel are optimized.

Great thread, you remotivated me to get this done.

[Motown 454]

Congratulation's Herb it looks and sounds great!

[Jims78elky]

Way to go Herb! Sounds nice and ready to go..are you going to do a in car test/run anytime soon? Would love to see how the system works full gas pedal boogie!




-Jim

[Yelcamino]

looks and sounds great Herb. DEI has the same covering in black.



Jody

Thanks Jody. I'll check this stuff out, maybe I'll have a reason to break down the fuel system and I can replace my orange line.

[Yelcamino]

This is very cool. I have been working with Mark Romans to create a crank trigger and a bracket using some MSD and LS parts for 1st gen BBC. This will allow for the use of the LS computers and a 24 tooth reluctor wheel.

Want to move to EFI on my 496. I believe there is a lot more power once timing and fuel are optimized.

Great thread, you remotivated me to get this done.

Thanks! Good luck on your project; I'm glad to finally be on the driving stage of mine!

[Yelcamino]

Way to go Herb! Sounds nice and ready to go..are you going to do a in car test/run anytime soon? Would love to see how the system works full gas pedal boogie!



-Jim

Thanks Jim! Next weekend I'll be at the Maxton Mile shooting for 175 mph. I'll have a few full throttle runs to post when I get back!

[Mike Holleman]

Thanks Jim! Next weekend I'll be at the Maxton Mile shooting for 175 mph. I'll have a few full throttle runs to post when I get back!

I hope you get the 175 cause then I'll have something to drive to bump my comp. license to a B. God knows it will never happen in the Elky.LOL

[Yelcamino]

I hope you get the 175 cause then I'll have something to drive to bump my comp. license to a B. God knows it will never happen in the Elky.LOL

Sounds like a plan to me. Then when you finish the Firebird, we can both shoot for 200+!

[Yelcamino]

Update time for the Mass Flo EFI system I installed on the 454 in my Chevelle. It was running great up until about two weeks ago and it's driving me crazy trying to figure out what's causing it to have multiple miss-fires at various RPM.

My first thought was plug wires and spark plugs so I replaced both and the miss-fires are still there.

I checked the computer for possible trouble codes and came up with code 11 which means all systems check good, of course!

With no trouble codes I assume all the sensors are good. With that in mind, it seems as though the mis-fire is ignition related, so I put the inductive pickup from my timing light on each plug wire and the coil wire. The timing light flashed inconsistently on each one. Sometimes it would flash steady, then suddenly stop flashing for a few seconds then flash, then stop, ect; there was no pattern.

I went to Mallory's web page and searched for info on the distributor that came with the EFI system. The distributor part # 794820004 doesn't come up in the search on their page. I emailed the Mallory tech line and they answered with it's a custom part for Mass Flo and I could send it in and they'd test it for me.

And yes I talked to the Mass Flo guy. He had me do a test with the tach, which entailed driving the car and watching to see of the tach would change RPM when the engine misfired. He said if the change was drastic, like 1000 or more RPM, then there is a problem with the primary ignition. If the change was small, like a 100 or so RPM, then the problem is on the secondary side. If there was no change, then the ignition system is fine. Naturally, there was no change in the tach RPM even though the engine was obviously mis-firing and then picking back up. My wife even thinks the mis-fire is very obvious.

Oh, and I also dropped a bottle of injector cleaner in the tank just in case, but of course, it didn't help!

So, any suggestions?

[My427stang]

I would guess either the Hall effect sensor (distributor pickup) or the TFI module

Both are cheap and you can buy parts for a 1993 Mustang 5.0

Here is a testing/troubleshooting procedure.



http://www.therangerstation.com/tech...iagnostic.html

[Yelcamino]

I would guess either the Hall effect sensor (distributor pickup) or the TFI module

Both are cheap and you can buy parts for a 1993 Mustang 5.0

Here is a testing/troubleshooting procedure.

http://www.therangerstation.com/tech...iagnostic.html

Thanks for the link!

I talked with Mass-Flo yesterday and because the tach RPM never changed during the mis-fire, I was told it's most likely a fuel supply issue. Considering the components that make up my fuel supply system I have doubts about that except for one thing, my pre-filter could need cleaning. Even though the gas tank is a new Rick's unit, there could have been some debris in the tank that's now in the pre-filter. I'm going to check that today; it would be nice if that's all it was.

[My427stang]

Another thing I have seen happen with EEC-IV computers is that the stock capacitors burn up and take out the circuit board. Happens pretty frequently.

If you continue to find nothing, pull the ECM and look at the board. Mine burned up and even the cheapo Autozone replacement had much larger capacitors which supposedly can handle the power better.

In this pic, the arrow points to the burned part. The blue cans with the white centers are the capacitors that did the damage.

The car ran with no codes saying anything was wrong

[Yelcamino]

Another thing I have seen happen with EEC-IV computers is that the stock capacitors burn up and take out the circuit board. Happens pretty frequently.

If you continue to find nothing, pull the ECM and look at the board. Mine burned up and even the cheapo Autozone replacement had much larger capacitors which supposedly can handle the power better.

In this pic, the arrow points to the burned part. The blue cans with the white centers are the capacitors that did the damage.

The car ran with no codes saying anything was wrong

That's interesting info.

I checked my fuel filters and the pre-filter had some junk in it, but it wasn't even close to being enough to reduce flow. I cleaned it and put everything back together.

Before I cleaned the filter I had to empty the tank so I pumped it into the Elky's tank. Check out the fuel flow before I cleaned the filter (click the picture)...



I still think it's in the ignition by the way it's been running. I was thinking about replacing the ignition module to cure my curiosity. I checked Autozone and Advanced Auto and they're only about $40. A cheap way to eliminate an item. I noticed there are 6 pin and 9 pin modules. Do you know which one I should get? If it turns out the module isn't the problem, I'll check out the circuit board like you mentioned above.