940 won't hot start

[Bigjon]

Hi All.
First time here, and I can't find the answer looking through the previous
posts.

'89 940 1999cc non turbo gle auto saloon.
Runs fine, 100%, until it's hot (the weather, not the engine, the temp
gauge never goes past vertical).
In hot (36c+) weather (not when cold) it will just stall in traffic queues,
revs just drop away unexpectedly like, and when restarted will drop off and
stall unless revs held high (1800+) for 20 seconds or so, when it seems
fine again.
Then it's 100% whilst driving, but when idling in traffic again it will
repeat the stalling until it gets a run of half a mile or so, then it's
fine until pauses for traffic again.
After another short run, in which it drives perfectly, you can park it up
for a minute or so to a couple of hours, and it will start fine, then revs
drop off within a few seconds and it stalls. It's recently started to stall
after starting in the mornings, but it's been a warm few weeks here in the
UK.
Regularly serviced by me, filters, consumables and fluids etc all fine..

Any thoughts ??
I am reasonably mechanically minded, but not so hot with electrics....
Haynes is no help for this !

 

[Bigjon]

Bigjon declared:

Hi All.
First time here, and I can't find the answer looking through the previous
posts.

'89 940 1999cc non turbo gle auto saloon.
Runs fine, 100%, until it's hot (the weather, not the engine, the temp
gauge never goes past vertical).
In hot (36c+) weather (not when cold) it will just stall in traffic queues,
revs just drop away unexpectedly like, and when restarted will drop off and
stall unless revs held high (1800+) for 20 seconds or so, when it seems
fine again.
Then it's 100% whilst driving, but when idling in traffic again it will
repeat the stalling until it gets a run of half a mile or so, then it's
fine until pauses for traffic again.
After another short run, in which it drives perfectly, you can park it up
for a minute or so to a couple of hours, and it will start fine, then revs
drop off within a few seconds and it stalls. It's recently started to stall
after starting in the mornings, but it's been a warm few weeks here in the
UK.
Regularly serviced by me, filters, consumables and fluids etc all fine..

Any thoughts ??
I am reasonably mechanically minded, but not so hot with electrics....
Haynes is no help for this !

Ok, thought I'd leave it for a week - but no replies !!
What gives here - I thought there might be a mechanic here somewhere that
could at least point me in the right direction !!

Fixed it anyhow - I think.
I put in a new fuel pump relay, all seems fine now.

 

[Bengt Ovelius]

I had the same problem, but it has nothing to do with temprature !

That's the only problem I had with 2 of my 940-s,
but it is a potential problem in ALL 940
according to expertice.


An good advice for all 940 owners :
Take out the fuel pump relay,
take off the cover.
Look with a pocket lens on the printed
circuit board and fix with a solder iron
everything that looks suspicious.
(there are only a very few solder points)

When this is fixed (very easy)
I would not be surprised if 940 is the most
reliable car in the world !



Regards
B.O