LH-2.4 ECU required for 94 N/A 940

ShKa · 2025-10-09T03:15:45+00:00

Dear all I'm needing a WORKING ECU for my 94 N/A 940 .. Can anyone assist? ECU numbers compatible are apparently 0280 000 935/ 954/951/946/943 but these...

Anthony

Crankshaft position sensor ?

(Apology if you mentioned it in your list)

ShKa

ramrod

so looking at more detail in response to your suggestions-

spark plug order looking at dizzy from front of engine is left to right is 4312.

Timing - yes I think that is correct. I have lined everything up correctly but I need a timing light to confirm 100%

Fuel pressure - static = 37 psi , idle (vacuum) = 35-37 psi idle (no vacuum) = 43 psi BUT when engine is revved - fuel pressure DROPS to around 33 psi

It takes about 20 attempts to get it started..then idles roughly. if I rev it , the take my foot off , it stalls and stops.

Engine revs freely when throttle pressed -once I get it going/ warmed up.

No smoke from exhaust.

All sensors been renewed.

OBD check functions : with sensor placed in hole 2 , code 1 flash pattern is 111 and fan , stepper valve and injection all comes on .

OBD hole 6 - I get pattern 334 -which I believe means TPS is OK

When I check code 2 and code 3 - rapid flashing lights come on.

Ideas ? lol!

ShKa

Evan11509 cheers

Anthony

Quote: spark plug order looking at dizzy from front of engine is left to right is 4312.

Timing - yes I think that is correct. I have lined everything up correctly but ..,,

The more correct answer is:

Right to Left 4-3-1-2. Right being the brake booster side for RH drive. Pic attached.

Fix this and it might just start!

Image description

ShKa

Anthony

Yes- that's exactly how mine is. 4-3-1-2 from left to right looking at it from FRONT of engine bay with 4 being next to brake booster. You can say 4-3-1-2 from right to left if you like if you are sitting in the drivers seat! Each to their own 🙂

jamesinc

Given the symptom and the new sensors, is it possible you have an LH-2.2 engine coolant temp sensor instead of 2.4? They're incompatible, but physically identical, except 2.2 has a blue connector, and 2.4 has a black connector.

ShKa

jamesinc I have the black connector .

ramrod

So what I’m understanding from your explanation is your engine seems to respond and run satisfactorily once it warms up.

If that’s the case, does it idle? Any complaints with the way it drives once it’s warm?

Is this a cold running and starting issue only?

ShKa

ramrod Its more complicated than that. it will "drive" but stall and backfire when slow and when I press the gas.. BUT if I shift into gear 1 or 2 as opposed to D , it will rev and drive. I can't drive it around as no plates at present. And fuel pressure goes DOWN when I rev it . Reading up , could be radiosuppression/ fan relay-which weirdly control the injectors apparently and can do exactly what Im describing, fuel pump relay, fuel pump , blocked fuel filter (unlikely as new ). Would like to just try a new/working fan relay but can't seem to find any online these days . Ditto for the pump relay ( the wee blue one in the tray Volvo 9130270 )

Major Ledfoot

Have you checked the EZ-K for codes too?

Via Socket 6.
https://www.volvoclub.org.uk/faq/EngineOBDCodes.html

ShKa

Major Ledfoot

yes - the tPS sensor reads good. But anything after that just flashes really rapidly.

jamesinc

Any relay you are suspicious of just short it out. If you have direct power to the pumps and your fuel pressure drops under load then you know you have a fuel delivery restriction.

ShKa

jamesinc Yep , that's what Im thinking.

ramrod

It would never be a bad idea to pull all the engine related relays apart (and their wires) for inspection.

I’m interested to know why the fuel pressure is dropping. It should be a constant 3 bar full time (under load or not) what happens when you remove the vacuum to the fuel pressure regulator and then go for a drive? Do you have the luxury of watching the gauge whilst driving?

The fact that it goes down to 2 bar is concerning but, doesn’t seem to account for the rough running

Further diagnosing is necessary.

dmc

have not read entire thread, has the fuel pressure reg been checked?

pull the vacuum hose off, fuel equls bad, dry equals good.

ShKa

dmc Yes , first thing I did . And I have a spare one which I used- no difference.

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