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General Chat / Re: New guy on the Central Coast NSW
« Last post by Old guy on Yesterday at 06:57:53 PM »
Long Jetty Automotive Engineering seems to be the preferred choice for Coasties. Ph 4332 5570. 483 The Entrance Rd, Long Jetty
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Post 84 / Re: C4 1990 Third Brake Light
« Last post by peterw on Yesterday at 11:51:15 AM »
Those COB LED's are very bright.
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Post 84 / Re: 1986 C4 MAF Sensor replacement?
« Last post by Vettech on Yesterday at 10:22:40 AM »
You should be able to see the Hot Wire.

Now when I say covered in crap - that crap in most cases is microscopic and is layered.

Run thru the tests, including the test for burn off.



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Post 84 / Re: C4 1990 Third Brake Light
« Last post by Vettech on Yesterday at 10:11:32 AM »
Umm very good.

I suppose the proof is in the pudding.

As long as they illuminate the red lens and are Bright.

Maybe I will see at a club run. (Those original bulbs I think are 5 watts each - pretty hot.)

Regards.
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Post 84 / Re: C4 1990 Third Brake Light
« Last post by peterw on Yesterday at 12:45:25 AM »
My original bulbs melted the fittings, obviously someone sat in traffic with their foot on the brake for a long time.  Those halogen bulbs must get hot.

The LED strips are cheap, they are 12v and brighter than the originals.

I bought them at an electrical wholesaler and they just cut them to length and put the pigtails on.  They are marked with little scissors on the cut points so you can cut them to length yourself and they still work like magic..

Just tied it to some stiff cardboard.  LED's don't generate heat so no problem there.

Soldered them to the point where the originals got their power and Bob's your uncle.

Pete
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Post 84 / Re: 1986 C4 MAF Sensor replacement?
« Last post by peterw on February 15, 2020, 06:31:10 PM »
I just pulled the MAF, it's Bosch so is likely the original.

It looks pristine, no corrosion or muck anywhere.

Still could be faulty though.
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Post 84 / Re: 1986 C4 MAF Sensor replacement?
« Last post by peterw on February 15, 2020, 06:19:11 PM »
Thanks for the detailed response.

Good tip about the relays.  I realise that any 35 year old electrics are likely to fail as the resin hardens and cracks in the components so would replace any that could be a potential failure.

Now, rebuilt MAF from Victoria (Injectronics or alternative?) or aftermarket one from USA?

I'm not 100% sure the MAF is faulty so I will youtube it and see if I can test it somehow.

Pete
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Post 84 / Re: C4 1990 Third Brake Light
« Last post by Vettech on February 15, 2020, 05:29:03 PM »
Pete.
So that is a strip of leds, tied to some card, and "set behind the front red lense, but in front of the reflectors".

Mine are again playing up, I did note before a lot of waterish looking dust inside - causing corrosion no doubt.

A trip to Jaycar may be in order.
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Post 84 / Re: 1986 C4 MAF Sensor replacement?
« Last post by Vettech on February 15, 2020, 05:14:58 PM »
And just to finish.

The burn off is activated "JUST AFTER" the engine is switched off (if certain criteria met - run time/engine to temp)

The ECM applies via the burn off relay etc a full 12volts to the wire, lights it up, and burns any crap off the wire.

So - any openings, cracks in the duct from filter to MAF, will allow "muck" into the engine, which can cook onto the Wire causing incorrect sensing ergo 0~5v signal ergo incorrect fuel mix ergo dicky idle or running. (Mostly idle)

The two relays MAF Burn off and MAF power can after years (30yrs) of use develope dicky contacts, change both as a matter of course. Sorry I'm having internet issues which keeps dumping me off line.
What I'm getting at here is, if the burn-off does not or has not occured for some time then the Wire could be in a really crappy state, this will play havoc with the ECM's ability to metre the correct fuel to air ratios for efficient engine running

Do you get code 33 as well ? Let me know and if a cct diag required.

P.S In the past I've had 33,34 &36, all these relays after conversion are up on the LH side fire wall, covered in all manner of crap, but more importantly are very close to manifold heat, I've had relays cooked, plugs cooked, wiring hanging on by one minscule strand. Best of luck.
Regards. 

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