New to me 940

[360beast]

I've got one off a 112k mile 940 turbo, I'll plug it in and see if it works and let you know.

[Laird Scooby]

Originally Posted by sam1

With a now working speedo, my MAF appears to have died.
Experiencing poor starting, lack of power when trying to accelerate, random stalling when driving. However idle is ok.
A code 121 is being thrown by the blinky light.
Ideally it would be nice to borrow someone's maf for a quick drive to see if it solves my problem! Or ideally purchase a good used bosch maf as new they appear to be £400+

Are you low on fuel or were you parked facing downhill? Check your in-tank pump. Clear the MAF code by pulling fuse #1 after putting some more petrol in.

[sam1]

Originally Posted by 360beast

I've got one off a 112k mile 940 turbo, I'll plug it in and see if it works and let you know.

thanks 360beast - i think they are all the same for all models? the data book says so. i haven't actually looked at the p/n on my maf but it is a bosch and probably original.

Originally Posted by Laird Scooby

Are you low on fuel or were you parked facing downhill? Check your in-tank pump. Clear the MAF code by pulling fuse #1 after putting some more petrol in.

HI Dave I did replace the in tank pump - i have a feeling maybe the fuel pickup is not quite at the bottom - not sure if there are any markers around the tank opening to show if it is properly lined up. it has about 1/4 tank, i will chuck another 20L in tomorrow if i have time and report back

[360beast]

The non turbo and turbo LH2.4 cars use the same MAF so there won't be any compatibility issues.

If you get a photo of the outside of your sender unit and I'll be able to tell if it is in the correct position.

[Laird Scooby]

Originally Posted by sam1

thanks 360beast - i think they are all the same for all models? the data book says so. i haven't actually looked at the p/n on my maf but it is a bosch and probably original.



HI Dave I did replace the in tank pump - i have a feeling maybe the fuel pickup is not quite at the bottom - not sure if there are any markers around the tank opening to show if it is properly lined up. it has about 1/4 tank, i will chuck another 20L in tomorrow if i have time and report back

If you've got the sender/pump unit locking ring on, the pump is at the bottom of the tank as long as the pipes are in the right place coming out. There are two arrows on the sender unit plate, should be horizontal. They're very tiny though! Later models only had one arrow pointing vertically.

Often when it throws an FTP, if the MAF code is present the ECU thinks the MAF is faulty as it doesn't show increased airflow from starting. It can't start if the fuel pump is faulty but the ECU doesn't know the fuel pump could be faulty so blames the MAF - complete red herring!

I'm not saying it's not the MAF, just that there could be other causes of the MAF symptom.

Yes, after a certain time (1992 i think) the MAF is the same for all 8v 4 cyl models, before that they could be different as some have a mixture adjustment screw like mine. With the mandatory fitment of cats, the mixture adjustment was deleted and dealt with by the ECU within prescribed limits.

[sam1]

Originally Posted by 360beast

The non turbo and turbo LH2.4 cars use the same MAF so there won't be any compatibility issues.

If you get a photo of the outside of your sender unit and I'll be able to tell if it is in the correct position.

Originally Posted by Laird Scooby

If you've got the sender/pump unit locking ring on, the pump is at the bottom of the tank as long as the pipes are in the right place coming out. There are two arrows on the sender unit plate, should be horizontal. They're very tiny though! Later models only had one arrow pointing vertically.

Often when it throws an FTP, if the MAF code is present the ECU thinks the MAF is faulty as it doesn't show increased airflow from starting. It can't start if the fuel pump is faulty but the ECU doesn't know the fuel pump could be faulty so blames the MAF - complete red herring!

I'm not saying it's not the MAF, just that there could be other causes of the MAF symptom.

Yes, after a certain time (1992 i think) the MAF is the same for all 8v 4 cyl models, before that they could be different as some have a mixture adjustment screw like mine. With the mandatory fitment of cats, the mixture adjustment was deleted and dealt with by the ECU within prescribed limits.

Haven't had time to tinker but managed to get some quick photos of MAF and tank connections. Won't have time for a couple of weeks to get stuck in.
Thanks for your advice

[Laird Scooby]

Originally Posted by sam1

Haven't had time to tinker but managed to get some quick photos of MAF and tank connections. Won't have time for a couple of weeks to get stuck in.
Thanks for your advice

Standard 016 MAF and the sender is in correctly.

[sam1]

Hmmm so just put 15L in the fuel tank and gone for a drive, was running perfectly until a roundabout 5 miles from home, some hesitation, slight misfire, then full on lack of power and stalled and now won't restart.
So I am awaiting the mrs to tow me home with the xc70 ha ha

[Laird Scooby]

Originally Posted by sam1

Hmmm so just put 15L in the fuel tank and gone for a drive, was running perfectly until a roundabout 5 miles from home, some hesitation, slight misfire, then full on lack of power and stalled and now won't restart.
So I am awaiting the mrs to tow me home with the xc70 ha ha

Try restarting it now! Also while you're waiting for the Mrs, check your earth straps in the engine bay, might be a loose or broken one.
If no joy, pull and refit fuses #11 and #13 and try again.

[sam1]

Originally Posted by Laird Scooby

Try restarting it now! Also while you're waiting for the Mrs, check your earth straps in the engine bay, might be a loose or broken one.
If no joy, pull and refit fuses #11 and #13 and try again.

Thanks Dave. There are 2 earth straps central on the bulkhead, one goes to a nut on the rocker cover and the other to nowhere, so attached it to intake manifold and restarted, idled for a bit then died. It was running spot on earlier so it must be fixable.
I can hear the main fuel pump running, but no idea about the in tank pump, although I replaced it for new last year and had no problems.
To add to the annoyance, mid drive my speedo stopped working after my careful repair