sgraber
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| posted on 7/8/03 at 10:37 PM |
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4AGE (MR2) Wiring - Scratch or reuse existing?
Speaking specifically about the engine wiring:
With wiring my car 'looming' on the horizon (bad pun), has anyone here ever re-used a stock wiring loom for the 16v tvis 4age? If you used
the 4age, did you rewire from scratch, or did you re-use certain parts of the original loom?
Any helpful tips or maybe websites with 4age wiring info?
Thanks
Graber
Steve Graber
http://www.grabercars.com/
"Quickness through lightness"
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mrmotorhead13
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| posted on 8/8/03 at 04:55 AM |
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I plan to use a modified MR2 harness in my car when I get to that point. For more info go here:
http://128.143.134.116/aw11parts.asp#electrical
There are a number of MR2 specific wiring diagrams. These diagrams should get you some useful information though.
Bill J
[Edited on 8/8/03 by mrmotorhead13]
Bill J
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eddymcclements
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| posted on 8/8/03 at 01:13 PM |
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I am just starting to wire my 1987 TVIS-equipped 4AGE. I'm going to clean, re-wrap and re-use the stock loom as it's got all the
connectors for temp and pressure senders, ECU, alternator etc etc. I will install a new fusebox and relay box, leaving out all the unnecessary stuff
for heated rear window, electric windows, sunroof and so on.
I've only got as far as fitting the battery main feed cable and engine/chassis earths, so there's some way to go yet!
Eddy
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sgraber
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| posted on 8/8/03 at 03:55 PM |
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Eddy, yes, I think that is the direction I am leaning towards as well. I labeled the loom fairly well when I removed it from the donor. I will have to
make sure that the labeling doesn't get "lost" while I am cleaning. I am obsessive about parts washing sometime and don't pay
close attention to the labels. My 280Z into 250GTO conversion took longer because I washed away all the labeling... Won't do that again.
Steve Graber
http://www.grabercars.com/
"Quickness through lightness"
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Spyderman
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| posted on 8/8/03 at 04:43 PM |
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From what I remember about striping my loom out, the engine part is separate to the junk anyway. So for mid-engine as in our applications the loom
should go back in pretty much as it came out.
I think!
Terry
Spyderman
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sgraber
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| posted on 8/8/03 at 05:03 PM |
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Terry, I think you may be right about that.
I am wondering if some of the wiring from the interior loom is required to get the engine running?
In any case, I will definitely need to do a TON of splicing and lengthening to put things where I want them. The 4AGE isn't that complicated
electrically compared to some other cars I have seen, but when you add the electrics and the vaccum lines together it becomes a rats nest.
Graber
Steve Graber
http://www.grabercars.com/
"Quickness through lightness"
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JoelP
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| posted on 8/8/03 at 05:38 PM |
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quote:
Originally posted by sgraber
I will have to make sure that the labeling doesn't get "lost" while I am cleaning.
not wrong there fella, i labelled all mine with masking tape and biro, it all washed off before i got it inside! gutted... its a nightmare trying to
work it all out!
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sgraber
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| posted on 8/8/03 at 05:42 PM |
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I plan on encasing the labels I wrote with clear packing tape. That way the writing will be visible, but untouchable by the solvents and cleaners.
Any other ideas on this? I think mine will be dandy
Steve Graber
http://www.grabercars.com/
"Quickness through lightness"
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Alan B
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| posted on 8/8/03 at 06:51 PM |
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Real men don't need no frigging labels...
I guess that's why mine are labelled too...
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Spyderman
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 posted on 8/8/03 at 11:11 PM |
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I always intend to label everything, then forget when I get carried away ripping it all out.
It usually ends up in a carrier bag until you can't find one end from the other, then have to pull it apart in order to straighten it out!
Spyderman
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eddymcclements
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| posted on 11/8/03 at 01:44 PM |
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Most of the engine loom connectors are colour coded and have different pin-outs so you can't connect them together except in the right
places.
All you fellow 4AGE-users....are you plumbing in the hot water feed to the throttle body for cold-start idle-up, or not bothering?
Cheers,
Eddy
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Spyderman
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| posted on 11/8/03 at 07:31 PM |
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I intend to leave my engine as standard as I can. That means leaving on all heated manifolds etc.
Once car is built up and running I may start tinkering then.
I've made that mistake too many times before of messing about with the engine before finishing car. It usually ends up as a complete engine
strip down and upgrade, that then has to sit and wait whilst I build the car around it. By the time I've done the car I've forgotten the
details of engine changes!
Spyderman
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mrmotorhead13
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| posted on 12/8/03 at 03:05 AM |
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I probably won't do any of the throttle body or other hoses other than those necessary to get the engine cool and ECU functioning properly. Of
course, where I'm from freezing is a cold winter day and it's generally closer to 60F. In the summer it's regularly 95-100F so
quick warmup isn't really an issue.
Bill J
Bill J
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Rob Lane
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| posted on 12/8/03 at 08:28 AM |
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Hi Eddy,
Nice to see you still about.
You will need to pipe up the cold start idle up, if you don't you will not get the revs down as it's spring biased.
It's this that provides the extra butterfly opening air when cold and enriched.
It performs the same type of function that a choke cable did.
Rob
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Rob Lane
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| posted on 14/8/03 at 08:28 AM |
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Steve,
I used the engine loom part for my build.
You will find it's fairly easy to distinguish all the sensors as they should be colour coded together.
The loom is fairly straightforward to wire in and I mated it up to my existing Escort RWD loom easily.
The wiring colour codes were not repeated except for one which caught me out. The ignitor feed wire, this had the same colour code as the
screenwasher pump feed!
I couldn't get the engine to start until I had sussed that one out. Using an oscilloscope finally to look for the ignitor pulses
There's an engine pic that shows loom fairly clearly on my site.
www.robs7.com
[Edited on 14/8/03 by Rob Lane]
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eddymcclements
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| posted on 14/8/03 at 02:01 PM |
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Hi Rob,
Yes - I'm still around, and still haven't finished! I now have two deadlines to work to...1. SVA 2. baby due 2nd October!
The wiring diagram in the Haynes seems to show a vacuum switching valve connected to the fuel pressure regulator on the end of the fuel rail. Does
yours have this VSV? I guess it could be used to keep the fuelling rich when you floor it, kind of like an accelerator pump in a carb. Aside from
that, I thought that FPRs were connected directly to inlet vacuum, to keep fuel pressure at a value relative to inlet pressure.
Cheers,
Eddy
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sgraber
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| posted on 14/8/03 at 02:38 PM |
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quote:
Originally posted by Rob Lane
Steve,I used the engine loom part for my build. You will find it's fairly easy to distinguish all the sensors as they should be colour coded
together.
There's an engine pic that shows loom fairly clearly on my site.www.robs7.com[Edited on 14/8/03 by Rob Lane]
Hi Rob, I am very familiar with your website. very, very familiar! I love your car and especially what you did to the intake plenum and the engine
in general is super clean. I looked at the loom again and you are right, almost everything is color coded. That will make the connection part easy.
Now I will need to decide where the major components will sit so that I can lengthed/shorten all the looms.
Thanks all for your input. Time to stop talking and start wiring....
Steve Graber
http://www.grabercars.com/
"Quickness through lightness"
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Rob Lane
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| posted on 14/8/03 at 09:12 PM |
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Eddy,
The water temp sensor feed to the ECU is used for other purposes via the ECU.
In this case the fuel pressure VSV is used to UP the pressure in fuel rail when engine is hot by altering the pressure regulator by switching vacuum
on/off above diaphragm.
Normally the fuel rail is fed directly from pump and the return to the tank is via the regulator which 'bleeds off' excess pressure from
rail. This can react quickly enough when all injectors call for full fuelling to keep pressure up.
Rob
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Rob Lane
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| posted on 14/8/03 at 09:18 PM |
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Steve,
Glad you like the site. I set it up primarily to show the car and later developed it to give as much info as I could relevant to building a car.
There are other photos that are not on site if you need any other info, I can also take a picture of any relevant part you like.
I also have a rough sketch of the water pipe modifications I made to allow for rear of engine filling and removal of the thermostat housing/heater
pipes.
Rob Lane
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