EFI Tester Help

[Liqui-Fly]

I have one of these testers and it is meant for the older analog ECU's. The book doesn't have the TPI less ECU's and does not show how to set the fuel potentiometers. Will it do this and if so how?

David

[sosmerc]

The tool doesn't allow you to "set" anything, but you can test your electronic tpi sensor by following the procedure on page 33 of the manual.
You may want to consider replacing the (no longer available) Merc electronic tpi with CDI's adjustable mechanical tpi part number 351-17814A3. It does work well and if you need help they have free tech support...ask for Sean. 1-800-467-3371

[Liqui-Fly]

I don't have a TPI on my A 37 and A 38 boxes but they are analog. How do I measure what % the potentiometer is at then. I was told It could be done with this setup by taking high and low readings off the meter and scaling it.

David

[sosmerc]

What engine model (and serial number) and is this a 11350A37 and A38? So you do not have a small black box with a clear vacuum line that's teed into the vacuum line that also goes to the fuel regulator as well as the plenum?

[Liqui-Fly]

There is no TPI on these boxes. Only a map sensor line out of the backs of them.
94 2.5 OD935756
The A37 came with it a 38 purchased as backup

David

[sosmerc]

So basically the TPI is internal and run off of the map sensor. Are you looking for some way to adjust richness or leaness? I don't think the analog boxes have any adjustment screw like the digital boxes. But CDI does make a remote adjustment control for the analog boxes (part number 454-9608)

[Liqui-Fly]

There is a pot in the front of the box just like the digitals. I just don't know the test bed settings to take the readings.

David

[sosmerc]

Bare with me, I'd like to help. But I'm getting confused. My "where used" card shows the 11350A37 only used on 2.5's and the card doesn't even list an "A38". Then, my high performance microfische model index only shows 2.4L EFI from 88-90. I have factory manual for 2.5 models D030200 thru D936999 and it shows electronic tpi in use with these motors.
I don't think I have seen an analog box being used without any tpi.
I'm really curious now, is there any kind of harness plug in the engine harness that is capped off or taped up? Is there an additional rubber "knock out" that provides access to any kind of harness plug on the ECU...like the digitals have?

[Liqui-Fly]

I changed the post. It's a 2.5. Yesn the harness has the TPI plug but it's factory "blocked off" and both boxes have the knock out plug with the pot inside. Check out the boxes on the Talon for sale in the over 20 ft section.

David

[sosmerc]

I don't know how the tester you have can be used to do what it sounds like you want to do. But I'll bet that Tony or Wayne knows...and I'm sure that Sean at CDI knows. I'm sure you have been following the threads on the fully adjustable units that Tony and Wayne have independently developed...wish I had the spare cash to buy one, they sound like the cat's meow. Since you have two motors, why not buy one of each?! Then you could give us all a detailed comparison test.
Are you running egt's? If so, what brand/type, etc...location of probes?
Nice looking ride I might add!!

[Liqui-Fly]

That rig isn't mine. I wish...maybe. My tester will be for sale soon. I also take trdes ect. I'll keep you in mind if your interested. I got it from Tony but don't like bugging him about this trash because I really haven't looked at it yet like I said I would. Just killing time and hoping somebody could walk me through it.

I am running pyro's though. Digitron and they are in the bottom two bolts of the divider.

David

[MTCM]

I think the the 11350A38 was originally the Analog Drag Box??? It was replaced with the 11350A48 in 1995 I think. Later the Drag Box was the A63 (1996?). The A37 (and others) was the Analog Box used on the 2.5 EFI MPP prior to 1996. In 96 I believe the A37 became the A49.

[sosmerc]

At least with pyros you can "see" what's happening when you change the ecu adjustment screw. I have the old analog box off of a 220 Laser and so I don't even have the pleasure of any adjustment screw. I have been watching and waiting for exactly what Wayne and Tony are doing.
I do also have Merc's DDT and it does allow seeing what happens when you "turn the dial" on the digital boxes. I really don't use my old ecu tester much anymore, seems like the only thing it is really useful for is checking wire continuity in the harness.
Thanks for the chat!

[sosmerc]

.....and it really gets fun when guys start swapping all this stuff around on their engines that have been pieced together from 5 different motors!!! Been there...done that!
Thanks for the info MTCM

[COMPRECBRKR]

Send (email) me your fax no. and I'll fax you the page from the manual that tells you how to test the internal TPI and adjust your fuel setting with the tester.

Lee

[Liqui-Fly]

Will do.

[Liqui-Fly]

I got the FAX and believe I understand. Now after folling the instructions to normalize the unit and get it set to 1.5...is it then at this point I move the pot on the ECU to get my maximum and minimum readings? Then average the two to get my center point or 100%. Is the adjustment linear?

It's seems like the A 38 should be the same. I believe it's an offshore box and might have a higher limiter.

David