couple TBI questions-need help asap

[lak2004]

Ok first thing, when I get the engine to TDC to set the timing, how do I point the distributor to the #1 cylinder? Is it the little brass looking thing that needs to be pointing to #1? Does anyone have a thread saved on TBI timing as well? Thanks

Also, I just realized that my distributor will need an external coil, is that correct? If so anyone know where I can find the wires that run from the dist to the coil (not just the spark plug wire)? TIA

Ok I know I have asked this before but I cant seem to find the thread where it showed what vacuum lines go where. The only one I remember was the one on the back goes to the MAP sensor. Other?

Can I get a pic of the throttle cable and TV cable bracket and mounting from someone who has a 700r4 and tbi?

Anyone know what this vacuum control piece on the firewall is for? Could it be for my 700r4 lockup? And also what this plug is for?

Will my ESC module be ok if I mount it to the ALT bracket or does it need to be on the firewall?

Thanks in advance guys! I am getting so close to having this thing finally running after 10 months of it sitting. Just need to figure out a few more odds and ends things. Also does anyone have a good write up on flaring fuel lines? I am just going to use the existing ones in my 85 so I have to cut them and flare them to connect to the throttle body. Thanks again!

 

[StevoandaRedK5]

I run a carb and have zero experience with TBI, but on the timing...

With #1 at TDC the rotor should be pointing to the #1 post on the cap, or at least that is how I would think it would be. (My HEI is like that, but i don't know if it's different for TBI)

 

[dyeager535]

You can't just flare the lines to connect up. They are o-ring fittings (same style as the later Power steering pressure side) so you'll either need an adapter fitting, or you'll need to hack a stock fuel line from the TBI era to connect up.

Timing is the same as any other 1st Gen. With motor at #1 TDC, pull the distributor out and drop it back in so the rotor lines up with (roughly) #1. Remember however, that where the rotor points is meaningless, you just need the rotor (at #1 TDC) to line up with the #1 plug wire/terminal (it can be any of them) on the cap. The real benefit of setting it in that location, is that you can get a fair amount of adjustment (mechanical advance or retard) before it hits anything. On EFI distributors, I'm not sure that matters, since there is no advance can sticking out of the side of it.

5th picture down is either a TCC switch (which TBI doesn't use) or there was one used for ESC?I can't recall, but some of the early trucks had two similar switches like that. I don't believe EITHER of those switches was used after TBI was introduced.

Last pic the module would work there, as long as the wires were secured away from anything that could cut them, like rubbing on the block, belt, fan, etc. I'd really rather have it on a solid flat surface, bolted, so it wasn't subjected to excess vibration, as it would be as you have it mounted. I'd not trust zip ties either...judging by your pic, it looks to me like the stock TBI ESC mounting plate would bolt to the intake right behind the alternator.

 

[Jason4x4]

Ok first thing, when I get the engine to TDC to set the timing, how do I point the distributor to the #1 cylinder? Is it the little brass looking thing that needs to be pointing to #1? Does anyone have a thread saved on TBI timing as well? Thanks

Brass pointed at #1, also, turn the dist ~90* counter clockwise. You need to get it running, then unplug the timing connector and set at 0*. Wires for coil to dist. http://www.aztpi.com/product.php?productid=106&cat=7&page=1..
Also, I just realized that my distributor will need an external coil, is that correct? If so anyone know where I can find the wires that run from the dist to the coil (not just the spark plug wire)? TIA

Ok I know I have asked this before but I cant seem to find the thread where it showed what vacuum lines go where. The only one I remember was the one on the back goes to the MAP sensor. Other? Big one to PCV, Under that to Charcoal can, one on right to egr solenoid.

Can I get a pic of the throttle cable and TV cable bracket and mounting from someone who has a 700r4 and tbi?never seen a bracket like that, your cables won't work.

Anyone know what this vacuum control piece on the firewall is for? Could it be for my 700r4 lockup? And also what this plug is for? Yes, lockup, and IIRC, it looks like air pump diverter valve.

Will my ESC module be ok if I mount it to the ALT bracket or does it need to be on the firewall?

Thanks in advance guys! I am getting so close to having this thing finally running after 10 months of it sitting. Just need to figure out a few more odds and ends things. Also does anyone have a good write up on flaring fuel lines? I am just going to use the existing ones in my 85 so I have to cut them and flare them to connect to the throttle body. Thanks again!

Yup, fuel lines are o-ring, http://www.aztpi.com/product.php?productid=96&cat=18&page=1 , I have some off of a TBi, will need to be cut and flared, cause 1 is a little kinked, but the end for the TB is good.

 

[Jason4x4]

Actually, your Throttle body looks like it opens opposite of a normal one, so I don't know how you can make it work

 

[wayne]

When setting the timing you need the computer disconnected. I have no idea on your wires but in this pic it is on the bundle of wires going behind the brake booster. You can see a little piece of brown wire about 1" out of the loom going into a connector which is taped to the bundle. You unhook that wire and set the timing to 0* and then plug it back in.

A Haynes manual will tell you most of what you want to know. You will need fuel lines for a TBI which was mentioned. You can look at the pics in this link for some help. If I were you I would go hit some junkyards and get the brackets, wires, and hoses off a tbi engine to make it easy.

http://imageevent.com/btsnpcs1990/bitsnpiecesbuild/engineswap

 

[lak2004]

The throttle body I have came off of a van. Now that I look at that pic of it better I think I can just unbolt the cable bracket on it and use one that bolts into the intake manifold. Could someone snap me a pic of their throttle cable bracket please? That might help clear that up. I am going to try and go to one of the junkyards south of here this week. Thanks for the help. I will move the ESC module.

I need to hook my 700r4 TCC up factory to the 85 unless I get a VSS so the computer controls it, is that correct?

 

[dyeager535]

Uhh, kind of.

Leaving it the way it's setup on the '85 would be easiest (probably) however that's more vacuum lines, which sucks.

I don't know what kind of variation there was with how the TCC was wired when used with TBI vs. carb. I can pull the wiring out of my '91 service manuals for the ECM controlled 700R4 lockup, but you'd need to know how the '85 TCC was wired up to ensure it was a direct swap. It probably was, the plugs themselves never changed, but that doensn't mean the wire position didn't. If it were ME, I'd give the ECM control of TCC, to simplify/remove the vacuum hoses/switches/wires.

 

[4X4HIGH]

It doesn't look like you can use that throttle body. It does open the same as a truck or blazer but the cable comes in from the front since it's from a van and there is no provision to hook up a cable in either a truck or blazer.

 

[GNERGY]

Here are a couple pics that might help. One old pic and 2 new ones of throttlebody bracket and cable mounting bracket.
Tarey

 

[dyeager535]

Am I missing something, or does that throttle cable bracket (if that's what it is, not TV or cruise cable) look like it's on the wrong side for the throttle body linkage? My TPI has the same type barrel lock cable setup on it, but it pulls from the opposite side as the TB in the picture shows. The way the cable connects in the picture would seem to indicate the cable would come in from the back of the TB. I can see the "track" that the cable should run in, going towards the rear of the vehicle from where the barrel lock would sit.

Trying to figure out how that should work in the first place...as a matter of fact, it looks to me like if you rotated that cable bracket 180* it would pull back, and up at a slight angle, which matches the way the accelerator cable "track" on the TB linkage is angled.

Here are two pics that show my throttle cable setup, which looks pretty similar to the ones shown by the OP:
http://dyeager535.topcities.com/TPI/index.html "airintakeDS.JPG" Clearly shows the barrel end of the throttle cable, and it's "track"
and
http://dyeager535.topcities.com/TPI/index_3.html "tpijune.jpg" Shows the angle of the throttle cable bracket...if the OP's bracket were unbolted and turned 180*, the throttle cable angle would be similar.
Sorry, cheap hosting doesn't allow hotlinking.

 

[4X4HIGH]

Looks to me that the inner "track" is where the throttle cable goes and once the cable is clicked into the brsacket the cable wraps around under the "track" and the barrel end is fitted into place in the rear which when the throttle is depressed would move the throttle blades in the normal rotation. IIRC this set-up came out of a 94ish van which would have had either the 4L60E or 4L80E which doesn't use a TV cable. The stud is for the cruise control rod.

 

[dyeager535]

OK I gotcha now...couldn't even tell that "inner" track was there, it looks like part of the TB! Is that another "track" going the opposite way?? That's what I was basing my idea on.

 

[4X4HIGH]

OK I gotcha now...couldn't even tell that "inner" track was there, it looks like part of the TB! Is that another "track" going the opposite way?? That's what I was basing my idea on.

Yes, there are two tracks there, what the second one is for is anyones best guess considering the fact that the trans was definately an E model of some sort and did not use a TV cable.