russbost
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| posted on 27/8/20 at 01:11 PM |
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Any MR2 Mk1 owners? Need a favour!
It's a bit of a cheeky ask, but I know we have some great guys (& gals) on here, so hoping someone can bail me out!
I have a F reg MR2 4AGE engine in a kitcar - at some time in its life the plugs that connect the loom to the distributor have been discarded & the
wiring soldered together, I have strong suspicions that they may be incorrectly connected. Sometimes when you start the car it runs completely
normally, absolutely fine, but sometimes it's as tho' it has started in a different "ignition mode" - it sounds as tho'
timing is really retarded & if you try to rev, it won't rev out, just sounds really flat, turn it off & restart & everything is fine
again, it rarely takes more than a couple of starts b4 everything returns to normal. All other wiring & sensors are standard, hence my suspicions
of this distributor wiring. The odd thing is that the wiring colours don't match - from the loom I have 3 wires a black, a white & a red,
the black & white go directly to the ECU, (but don't match the pins on a wiring diagram I found!)
unsure at present where the red goes. At the distributor the wiring colours are red, blue & white, the way it's currently connected (dist to
loom) is red to black, white to white & blue to black.
Is there any possibility one of you wonderful people could peel a bit of loom back adjacent to the plug (plug is 3 wire plug right near the
distributor) each side & tell me which wire is connected to which?
I have tried various combinations &, weirdly it seems to run in each of them, but I need to know which is correct so I can then proceed to set
timing up correctly etc.
Checking the wiring to the distributor, I know it has 2 different types of sensors, one of which generates 4 pulses & the other generates multiple
pulses (12 or 24 per revolution IIRC), the white wire shows 160 ohms between it & the blue & the same 160 ohms between it & red, so I
assume they share an earth & the red & blue relate to the 2 pickups, just to make things more confusing, go inside the distributor itself
& the wiring colours are just black & white! no red or blue in sight, they must change colour within the actual moulded connection into the
distributor!!!
Any assistance much appreciated, I've looked at the manual & various wiring diagrams but nothing really helps! 
I no longer run Furore Products or Furore Cars Ltd, but would still highly recommend them for Acewell dashes, projector headlights, dominator
headlights, indicators, mirrors etc, best prices in the UK! Take a look at http://www.furoreproducts.co.uk/ or find more parts on Ebay, user names
furoreltd & furoreproducts, discounts available for LCB users.
Don't forget Stainless Steel Braided brake hoses, made to your exact requirements in any of around 16 colours.
http://shop.ebay.co.uk/furoreproducts/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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gremlin1234
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| posted on 27/8/20 at 02:00 PM |
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I don't have an mr2, but...
it sounds like it is going into a valet parking mode, which when I look it up, some toyota's limit it to 4000rpm
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russbost
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| posted on 27/8/20 at 03:02 PM |
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Sounds a bit sophisticated for something of that age?
I no longer run Furore Products or Furore Cars Ltd, but would still highly recommend them for Acewell dashes, projector headlights, dominator
headlights, indicators, mirrors etc, best prices in the UK! Take a look at http://www.furoreproducts.co.uk/ or find more parts on Ebay, user names
furoreltd & furoreproducts, discounts available for LCB users.
Don't forget Stainless Steel Braided brake hoses, made to your exact requirements in any of around 16 colours.
http://shop.ebay.co.uk/furoreproducts/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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coyoteboy
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| posted on 27/8/20 at 04:41 PM |
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Ahh it's going back years now to when I megasquirted my 3SGTE of the same era, and the toyota ignition module, if it doesn't get accurate
feedback from the cam/dizzy VRs, flat refuses to rev over 5500rpm. It will still start and run, but runs like a bag of spanners.
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coyoteboy
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| posted on 27/8/20 at 04:41 PM |
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Ahh it's going back years now to when I megasquirted my 3SGTE of the same era, and the toyota ignition module, if it doesn't get accurate
feedback from the cam/dizzy VRs, flat refuses to rev over 5500rpm. It will still start and run, but runs like a bag of spanners.
Ah hang on, not the same ignitor I don't think. Ignore me, I did spend forever fighting a 5500rpm limit due to this but it looks like you
don't have the same sensor/wiring setup.
[Edited on 27/8/20 by coyoteboy]
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JonBowden
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| posted on 29/8/20 at 02:48 PM |
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I have a 4age from an MR2. it will use standard injection.
I have taken a picture of the loom side of the distributor connector but can't upload it
I could email it to you
The wiring goes:
Dist Red --> Loom White
Dist Black --> Loom Black
Dist White --> Loom Red
So the wiring is not what you'd expect.
If it helps, I have quite a bit of 4age documentation, PDF manuals and wiring diagrams
[Edited on 27/2/24 by _luke]
Jon
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russbost
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| posted on 29/8/20 at 03:16 PM |
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quote:
Originally posted by JonBowden
I have a 4age from an MR2. it will use standard injection.
I have taken a picture of the loom side of the distributor connector but can't upload it"
I could email it to you
The wiring goes:
Dist Red --> Loom White
Dist Black --> Loom Black
Dist White --> Loom Red
So the wiring is not what you'd expect.
If it helps, I have quite a bit of 4age documentation, PDF manuals and wiring diagrams
Hi Jon, thanks for the info, if you could email it to russbost@googlemail.com would be handy. Are your colours at distributor definitely red black
& white, I have red blue & white?
I've now discovered that the reason I couldn't find where the red wire in the loom went back to is that it had a break in it! I now find it
does go back to the ECU as you would expect
What pins on the ECU does your manual show the distributor wiring going back to as the only decent wiring diagram I can find defo doesn't match
the pins my 3 wires go to!
[Edited on 27/2/24 by _luke]
I no longer run Furore Products or Furore Cars Ltd, but would still highly recommend them for Acewell dashes, projector headlights, dominator
headlights, indicators, mirrors etc, best prices in the UK! Take a look at http://www.furoreproducts.co.uk/ or find more parts on Ebay, user names
furoreltd & furoreproducts, discounts available for LCB users.
Don't forget Stainless Steel Braided brake hoses, made to your exact requirements in any of around 16 colours.
http://shop.ebay.co.uk/furoreproducts/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1
|
NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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JonBowden
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| posted on 29/8/20 at 04:25 PM |
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Hi, I have sent the photo to your email.
The distributor wire probably is blue - but it was a dark blackish colour.
I'll look up what diagrams I have and get them to you.
Jon
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JonBowden
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| posted on 29/8/20 at 08:35 PM |
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ok, a bit more digging.
There is a 4age manual at http://files.aeu86.org/manuals/4A-GEManual.pdf
There seem to be a few different ECU pin-outs.
If you open the ECU, the pins will be labeled in tiny writing
The pins you want will be labeled G, G- and NE
I will send you a simple ignition wiring diagram by email
Jon
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russbost
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| posted on 30/8/20 at 03:07 PM |
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Hi Jon, not had a proper chance to look at it all yet, but I think that's exactly what I need, particularly knowing if I open ECU can get the
pins identified, you defo seem to have a black wire where I have blue, but I'm guessing as the other 2 wires are the same the ble is the same as
the black, I think the wiring diagrams you've sent will confirm anyway, much more comprehensive than anything I'd found
I will post findings when I get a look at it Tuesday/Wednesday in case it's of any use to someone else in future
I no longer run Furore Products or Furore Cars Ltd, but would still highly recommend them for Acewell dashes, projector headlights, dominator
headlights, indicators, mirrors etc, best prices in the UK! Take a look at http://www.furoreproducts.co.uk/ or find more parts on Ebay, user names
furoreltd & furoreproducts, discounts available for LCB users.
Don't forget Stainless Steel Braided brake hoses, made to your exact requirements in any of around 16 colours.
http://shop.ebay.co.uk/furoreproducts/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1
|
NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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russbost
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| posted on 3/9/20 at 12:30 PM |
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OK, all sorted, many thanks!
In case anyone has similar issues. on my ecu labelled Denso 89661-17140 & 175700-1042
G- is pin 3, loom wire is red connects to the distributor white wire which is common to both sensors
G is pin 4 Black wire in loom connects to blue or black wire at distributor which is the 4 pulse sensor
NE is pin13 White wire in loom connects to red at distributor which is the multi pulse sensor
Totally bizarre system & can't work out how it was even running b4 as the red wire was broken within the loom which you would expect to kill
both sensors!
Once restarted & checked timing was a fair way out, but all working fine now! 
I no longer run Furore Products or Furore Cars Ltd, but would still highly recommend them for Acewell dashes, projector headlights, dominator
headlights, indicators, mirrors etc, best prices in the UK! Take a look at http://www.furoreproducts.co.uk/ or find more parts on Ebay, user names
furoreltd & furoreproducts, discounts available for LCB users.
Don't forget Stainless Steel Braided brake hoses, made to your exact requirements in any of around 16 colours.
http://shop.ebay.co.uk/furoreproducts/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1
|
NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
|
