TBI Troubleshooting thread (split from Truck Avenger Thread) - JeepForum.com

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post #1 of 35 Old 10-02-2006, 03:52 PM Thread Starter
YJ_Aaron
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Well I'm going to spend a little more time on the TBI setup before I yank it all off to bolt on a carb. Give it one more attempt this weekend after the changes are made.


91 YJ rebuild! Rush to get it driving/wheeling.

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post #2 of 35 Old 10-03-2006, 04:34 AM
CJ51973
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I'm telling you, tap Bill USN-1. He can help.

Anything is possible if you don't know what you are talking about.
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post #3 of 35 Old 10-03-2006, 07:14 AM Thread Starter
YJ_Aaron
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Don't have a membership that allows me to search for someone to pm them. Otherwise i would have pm'd him for help already.

Aaron

91 YJ rebuild! Rush to get it driving/wheeling.

http://ozarksjeepthing.com/c/index.php
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post #4 of 35 Old 10-03-2006, 08:58 AM
CJ51973
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I'll PM him and link him to this thread.

Anything is possible if you don't know what you are talking about.
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post #5 of 35 Old 10-03-2006, 10:33 AM Thread Starter
YJ_Aaron
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Cool thanks.

I've only got this weekend to get it lined out before an event i'm already paid to participate in. So would appreciate any advice.

91 YJ rebuild! Rush to get it driving/wheeling.

http://ozarksjeepthing.com/c/index.php
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post #6 of 35 Old 10-03-2006, 11:05 AM
Bill USN-1
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Doesn't sound like it's anything real serious but...

Tell me exactly what system you have.
On the ECM computer will be a label. It will have letteres and numbers on it.
These are the ECM # and the BCC-broadcast code.
Should be something like 1227747 ASDU.
I need those off the label.

Let me know what your capabilities are.

You say you have a error code 24 so you can read codes.

Do you have a data cable to log data from the ECM?
This requires a laptop and the WINALDL program.

Do you have a multimeter and can read pins?

Have you done any actual troubleshooting or reading values of the sensors?

Go here and download and print these 7 pages of the wiring and pin outs. I may need to direct you to them.
If you look at sheet 1 it has voltage reading in the left and right columns. They are "key on" and "eng run". If you can perform these it may help speed things along.

You said your timing was off.
Did you unplug the bypass connector by the coil prior to checking the timing setting?

FI Mod Binder Planet
Bill at Hamiltonfuelinjectiondotcom
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post #7 of 35 Old 10-03-2006, 11:13 AM Thread Starter
YJ_Aaron
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Yes I unplugged it before resetting as base timing. I haven't done this before but a buddy of mine has and he's the one who has started to help me rework it. I'll get the # off it when i get back home this evening.

As far as reading codes I did the bypass wiring in the OBD port and counted the flashes of the dummy light setup as Service Engine.

Thanks for your willingness to help

Aaron

91 YJ rebuild! Rush to get it driving/wheeling.

http://ozarksjeepthing.com/c/index.php
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post #8 of 35 Old 10-03-2006, 11:21 AM
Bill USN-1
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OK here are some intitial system setup steps to perform to ensure you are starting on the right foot!!

Initial set up procedures.



MODERATOR.....it may help to split this thread so the carb discussion can continue!

FI Mod Binder Planet
Bill at Hamiltonfuelinjectiondotcom

Last edited by Bill USN-1; 10-03-2006 at 11:32 AM.
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post #9 of 35 Old 10-03-2006, 10:50 PM
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Not to get to off topic - Bill, I reset the timing to establich a base to further diagnose his YJ. I can read a meter and if this doesn't fix the problems then I will definitely check the PCM. Thanks for those links.

What is the ALDL software and where would one find it and the plug to use a laptop? I am interested in this because it would make diagnostics on mine, Aaron's and a couple other Chevy motors allot easier. I currently use Mitchell's software but it is a IF/THEN type setup. Thanks in advance.

Oh yeah - I am the guy trying to keep Aaron from removing a perfectly good if not poorly executed TBI sytem for a carb. The timing plug is just laying on the intake and allot of the wiring needs to be traced and cleaned up. I will get to that in time but more worried about driveability issues at the moment.

Brad
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post #10 of 35 Old 10-03-2006, 11:32 PM
Bill USN-1
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Quote:
Originally Posted by OJTV8XJ
Not to get to off topic - Bill, I reset the timing to establich a base to further diagnose his YJ. I can read a meter and if this doesn't fix the problems then I will definitely check the PCM. Thanks for those links.

What is the ALDL software and where would one find it and the plug to use a laptop? I am interested in this because it would make diagnostics on mine, Aaron's and a couple other Chevy motors allot easier. I currently use Mitchell's software but it is a IF/THEN type setup. Thanks in advance.

Oh yeah - I am the guy trying to keep Aaron from removing a perfectly good if not poorly executed TBI sytem for a carb. The timing plug is just laying on the intake and allot of the wiring needs to be traced and cleaned up. I will get to that in time but more worried about driveability issues at the moment.

Brad
Brad,
I recommend starting with the FAQ's at the FI forum in my sig.

I have everything laid out for the wiring and also have the data logging and tuning it yourself documented. Cable can be made for about $6 in radioshack parts.
Software is free.


One thing I am curious about on Aarons is if the timing is even working.
I would like to know if the timing went back to about 15° after you reset the timing and restarted the motor.
It almost sounds like it is just running off the default safe mode in the EST.
This will run your base timing until 2000 rpm then it adds 20° to help drivability so you can get it home.
There is no curve just base timing and +20.

But i don't want to side track until all the initial stuff is done and checked.

FI Mod Binder Planet
Bill at Hamiltonfuelinjectiondotcom
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post #11 of 35 Old 10-04-2006, 12:12 AM
OJTV8XJ
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Bill - It isn't running in safe because after I changed the base timing and restarted it I watched the computer jumping the timing at idle. I didn't know that in safe mode it wouldn't change it tho. I just always recheck it to see if the computer is after I change it.

Is there a way to run a TBI without any speed sensor and not blow the 24 code? Aaron has no speed sensor and it will save me the money from putting one on mine. I know that the VSS is what runs the EGR but can you loop or bypass it?

This is probably in that link - I will check it tomorrow. Thanks again.
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post #12 of 35 Old 10-04-2006, 02:16 AM
Bill USN-1
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The VSS can't really be bypassed without setting the error flag.
You can run without it but it will set the error.( keep the SES light in the glove box or just have a spade connector on one of the leads so you can unplug it!)
There is a thread discussing the pros and cons of the VSS along with cheap alternative to use one.
It's not as hard or costly as you may think.

It takes a simple change in the chip to eliminate the error flag, but it means a new chip!!
This is where the whole tune it yourself stuff comes in!!

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Bill at Hamiltonfuelinjectiondotcom
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post #13 of 35 Old 10-04-2006, 10:12 AM Thread Starter
YJ_Aaron
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Well glad you 2 know what your talking about. I just read all that and don't have a clue what it meant.

Thanks for the help from both of you guys.

Aaron

91 YJ rebuild! Rush to get it driving/wheeling.

http://ozarksjeepthing.com/c/index.php
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post #14 of 35 Old 10-04-2006, 12:39 PM
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Quote:
Originally Posted by YJ_Aaron
Well glad you 2 know what your talking about. I just read all that and don't have a clue what it meant.

Thanks for the help from both of you guys.

Aaron


Come on dude you are smarter than that.

All they are saying is:

Realign the plasma relays and increase coolant factor by .056 and reduce shields down by 50%. Double check vector factor to ensure flow rate is 1.62 times greater than the flux ressistance.


Geez, you did not get that !!!

FI is cool on a cj but the funds keep me on the carb.

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post #15 of 35 Old 10-04-2006, 05:43 PM
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Oops guys, I might have messed up. I was trying to split the thread into two separate ones to make them easier to follow (Avenger and TBI threads)... thing is, I don't know where the Avenger thread went.. Sorry bout that. Feel free to start a separate Avenger thread if you think it's needed.

'80 CJ5 w/AMC360, T176, D44 w/Detroit 4.56, RE 4" YJ lift and 35s..


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