Electrical problem 940

[nutco]

[QUOTE=Laird Scooby;2614166]

Originally Posted by nutco

Apparrently his plugs are very black so i'd say yes, i can guess you're thiking Lambda sensor?

Thing is, as far as i understand the situation, it does it from cold as well when an over-rich mixture wouldn't cause the same sort of problems. Hence the fuel pressure test above, not to mention having gone through several other things from the start of the thread.

not the lambda sensor, just a long shot while he waits for the injector light to turn up, ive had both my volvos temp sensor to the ecu go faulty both had some differing symptoms 1 of them mirroring some of whats going on here, I was going to suggest he just pulls the plug to the temp ecu sensor off then let it warm up and see if the rough idling is still there

[Laird Scooby]

[QUOTE=nutco;2614177]

Originally Posted by Laird Scooby

not the lambda sensor, just a long shot while he waits for the injector light to turn up, ive had both my volvos temp sensor to the ecu go faulty both had some differing symptoms 1 of them mirroring some of whats going on here, I was going to suggest he just pulls the plug to the temp ecu sensor off then let it warm up and see if the rough idling is still there

I can see why you're saying that but if you read the thread from the start you'll see it's not as simple as a straightforward mixture problem. There appears to be a separate electrical problem causing some gremlins which we're working through at the moment, it hasn't been helped by his enthusiasm to try unrelated things.

Thing is, with the CTS as you're suggesting, while cold it would run better as it needs more fuel - if the values are too far out the ECU will substitute a Limp Home value of 60C for the CTS which will make it a pig to start from cold but will allow acceptable running once hot with full closed-lop mixture control via the Lambda which does nothing when cold anyway.

I'm not saying it isn't the CTS, just probably not a suspect at the moment.

[aardvarkash10]

progress of sorts while I was asleep - gotta love geophysical realities!

Two weeks is a long time to wait for the NOID lamp. Dave, can you do a round-up of what we know so far? Symptoms and confirmed findings.

After that perhaps we need to know what Ammo has in terms of test equipment.

It is LH2.4 isn't it?

[Laird Scooby]

I'm confused by the delay on the NOID light as well, should be a matter of days, not weeks!

That aside, as far as i can remember it all without going through the whole thread again :

Won't rev above 3000rpm cold or hot

0.15V drop between alternator and battery

RSR is ok, so is the wiring to the injectors, no resistor pack for the injectors either.

Pretty sure it's a B230FD which is LH2.4

Battery and alternator appear to be working ok

Can't think of anything else, might have missed something, can you think of anything else Ash?

[aardvarkash10]

poor idle - unstable, low rpm if I understand correctly.

Starts ok.

All this regardless of load, but this bit I am guessing.

Ammo, can you please confirm that Dave and I have got all the symptoms covered. Can you also tell us what tools and test equipment you have available.

[Laird Scooby]

Originally Posted by aardvarkash10

poor idle - unstable, low rpm if I understand correctly.

Starts ok.

All this regardless of load, but this bit I am guessing.

Ammo, can you please confirm that Dave and I have got all the symptoms covered. Can you also tell us what tools and test equipment you have available.

Ah, yeah, forgot the poor, low idle. I made the same assumptions re load as it appears undriveable at the moment.

[Ammorack]

Originally Posted by aardvarkash10

poor idle - unstable, low rpm if I understand correctly.

Starts ok.

All this regardless of load, but this bit I am guessing.

Ammo, can you please confirm that Dave and I have got all the symptoms covered. Can you also tell us what tools and test equipment you have available.

Correct. It’s what’s going on with this car.
I have access to a workshop. So there’s a lot of tools there except the noid light. No idea why there’s no noid light there. What kind of workshop is that anyways...

Have basically tools to check leakage in cylinders, pressure test, injector fuel tester. Barometer... you name it. You get it . It’s a brandworkshop. So yes. I have tools available.


It’s LH2.4 B230FD 940 GL 1994

[Ammorack]

[QUOTE=nutco;2614160]

Originally Posted by Ammorack

I unplugged that vacuum hose. There was slight different idle. But I can’t really tell because the engine almost stalls if it’s on idle for more that 5 minutes.

when its idling rough does the exhaust fumes smell very rich ?

The whole car smells like gas. Not inside the car though. No leakage aswell. Smells strong gas fumes

[Laird Scooby]

Originally Posted by Ammorack

Correct. It’s what’s going on with this car.
I have access to a workshop. So there’s a lot of tools there except the noid light. No idea why there’s no noid light there. What kind of workshop is that anyways...

Have basically tools to check leakage in cylinders, pressure test, injector fuel tester. Barometer... you name it. You get it . It’s a brandworkshop. So yes. I have tools available.


It’s LH2.4 B230FD 940 GL 1994

This long delivery on the NOID light has me wondering - where in the world are you?

[Ammorack]

Originally Posted by Laird Scooby

This long delivery on the NOID light has me wondering - where in the world are you?

US Virgin Islands