Hello everybody!

Okay so I got a frantic call from a family friend begging for my assistance bc their 744t sputtered and died and will not start.

It's a 1990 744t LH 2.4

So far quickly I've tried to get codes and when hooking up the lead to socket #2 the light stays on. I tried socket #6 and i got a code for a faulty fuel injector relay. I had a spare and replaced it.
I have both spark(white) and the cranks (cam turns)
Fuel pump runs bc the po hard-wired it.
(planning to fix that for them once i read up on how to rewire it.)
Seems the fuse at #1 is missing and the slot is semi-melted... could be a po issue.
I've tried the limp home trick with the amm but that was a no go.
While starting the tach needle jumps.
I've swapped in a newer fuel pump relay
Could it be a fuel injection resistor issue? Or the ECU?
I thought maybe it's a power stage issue but the needle moves,
fly wheel sensor is new (less than 4 months old)

So far I've cleaned the injector grounds and still a no-go

If I crank the engine for 10-20 seconds the engine starts a lil blips up to 1k rpm and then imediately dies.

I put in a new powerstage but still no go.

Socket #2 light is constantly on when i plug in the tester.
I pulled the plugs and they're fouled.

Thanks in advance,
Mark












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1989 745tic+ con ipd sways

Hello Mark; You could try installing new plugs, and see if that helps. If not, then pull 'em after trying to start and see if they are wet to see if it is a fuel issue. But it does not look promising with all of the 'jury rigging' electrics going on.
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'94 940 na Regina 150k, '86 240 180k Gary Gilliam Sumerduck, Va

And OBD socket #2 comes right from ECU pin 12. Not a good sign.
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.

Would that mean the ecu is shot?

After some questioning i found out that the car always had issues starting. Meaning, that it'd take 3 complete twists of the key to get her to fire up.
What troubles me is the "burnt" socket where fuse #1 should be.
I disconnected the battery and removed the ecu to look at the pins and they're spotless w/o any corrosion. Should i go and open it?
Anyone recommend a good place to find a replacement ecu? I was thinking ebay.
If it was the fuel computer would it then show up in the socket #6 codes?
I'm off to pepboys for a new set of plugs.

Thanks again!
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1989 745tic+ con ipd sways

I couldn't say for sure about the ECU, but that solid LED isn't right.

Fuse #1 is the main FI fuse. Not a happy sign there either. It feeds everything, via the FI relay — pumps, injectors, AMM, ECU, you name it.

Yes, ebay has ECUs. One of the regulars here, "Hardknocks1" sells them, tested and guaranteed.

Obd socket #6 is for the EZK Ignition codes.
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.