Volvo 245- 86 Motor B230A with carburator

[Lennart]

Hi
I have a very strange motor problem with my old Volvo-86 model 245 with
motor 245A with carburator. (manual gearbox no fuel injection)
After start the motor runs perfectly normal, it responds to more trottle and
runs smoothly.
After about 30 seconds it suddenly almost dies and starts to run very
unstable or stops, hardly any responce to more throttle.
If I restart it the same behaviour occurs so the fault situation is
possibly to repeat.
If I start it again at once the fault behaviour comes back a bit quicker
and with a longer stop in about 30 seconds.

What I have already tryed to do
Changed the ignition module (the little black transistor or thyristor box)
"twice".
Tryed with another ignition coil.
Dismounted the carburator and checked it/cleaned it.
Try to spray fuel direct into the carburator before the motor stops.(no
improvement of the unstable behaviour)
Dismounted the fuel pipe to see that gasoline comes to the carburator.

What I think more.
Could the hall-element in the distributor cause this behaviour??

Have any one else seen this behaviour or found a solution? or have an good
idea how to go on with the fault finding and diagnose.


Best regards
Lennart from Sweden

 

[Leiv Magne Faane]

Hi Lennart.

I do also have the exact same engine than you, '86 model 244, and have had
almost the same problem that you describes. I agrees with Vestman, with the
list of things to check. That's the most basic things. However, I would like
to add something to the list, because those things didn't solve my problem.

I had to replace my EGR valve and tubes on mine, because it was filled with
filth(and water, pretty suprisingly), and the when I tested the EGR valve,
by putting wacuum on it, it didn't move. The EGR valve's fuction is to open
for some exhaust to be "burn" ones more and that is supposted to open and
close depending on the temperature in the engine. This system is connected
to the vacuum (carburator and the vacuum "clock"), and can cause that kind
of behaviour.

The EGR-valve is located under the the carburator, mounted on the motor
block. One tube is connected on the top of the ingoing manifoil, and the
other goes around the engine, to the outgoing manifoil (exhaust system),
between the engine and the firewall. Check for injuries or cracks on them as
well.

Feel free to send mail directly to me at faane(a)webogdata.no, for
description in Norwegian/Swedish.

Hope the information will be usefull.

Hälsning från
Leiv Magne Faane, Norway
'86 Volvo 244 GLE, B230A, 260000 km

 

[Lennart]

Hi Leiv Magne
Thanks for your suggestion with the EGR valve.
I have already checked it, I can feel moving with my finger when i give more
trottle.
But when i read your answer I remember that there is a filter somwere in
that area which might have to be cleaned.
/Lennart
PS: The strange thing with my problem is that it happens suddenly, like
something get overheated and suddenly stops working.

 

[Leiv Magne Faane]

Thanks for your suggestion with the EGR valve.

I have already checked it, I can feel moving with my finger when i give more
trottle.

You can check that the EGR-tubes that is connected to the EGR valve, has
free flow (that the tubes are open, so you can blow through them). One of
mine were all filled with burned particles along the sides inside of it, and
the other only had about 2 mm hole through it, and it shoul be around 7-9
mm.

But when i read your answer I remember that there is a filter somwere in
that area which might have to be cleaned.

Hmm, I'm not sure that filter you are refering to, but from the top of the
air filter, you probably got a thick rubber tube, going to the other side of
the engine block, with a black cylinder formed plastic thing on it. That
thing reminds me of some kind of filter. I don't know of any other filters,
but I'm not a proffessional mechanics.

PS: The strange thing with my problem is that it happens suddenly, like
something get overheated and suddenly stops working.

Strange. I can't say I actually let it run on idle to this happend for me,
but mine could run smoothly untill I have had driven 200 meter, and then
suddenly started to not respond when I tried to accellerate, and make my car
jump like a animal, and I had to constantly keep the engine up around
1500-1800 rpm, to keep the engine running. And on long distanse trips, I
could drive normally for hours, and then suddenly, the engine lost all power
and died out. But when I started it, 2 seconds later everything worked fine
again.

I'm not sure you have the same problem as I had. Problably not since you EGR
valve worked as it should. I had to use a flat screewdriver and a hammer, to
get it loose, so I think the previous owner didn't care must about his car,
not as much as I do anyway. =)

I wish you the best of luck, and don't give up too soon.


- Leiv Magne Faane, Norway
'86 Volvo 244 GLE, B230A, 260000 km

 

[Gary W]

the fall effect sensor i had that problem,,, the car runs great untill
it's warmed up , then at randome times it just cut's out and the tach drops
like a stone. have you ever looked @ the tach? does it fall faster than the
engine, aka the tach hit's 0 and the engine is still dieing?
another way to tell is when you turn the engine over once the car is dead,
does the tach twitch at all (a couple hundred rpm's)

if it's just cutting out a little bit here and there, then, does it help the
bring up the rpms?

thoes were all signs of when mine went out. I hope this helped.

Gary

Hi Westman.
Thanks for your answer.
There is oil in the carburator.
The needle is farly new ant the membrane is ok.the big aliminium cylinder in
the carburator is mooving.
I havent located any fuel filter but it seems to be fuel feeded to the
carburator, I removed the fuel pipe to the carburator and runned the motor
with starting engine and it seemed to pump gasoline.
I have checked two of the vacum hoses the one at the distributor and the
little one at the carburator by sucking/blowing in them and they seems to be
ok.
The strange thing is that when the fault occurs it happends suddenly like
something get overheated like it was electronic failure thats why I have
some suspition about the hall-element in the distibutor but at the moment I
don´t really know how to check it and it is a expensive sparepart to buy to
check with.
Thanks for the tip on the danish forum.
Cheers
Lennart from Sweden

Hi
I have a very strange motor problem with my old Volvo-86 model 245 with
motor 245A with carburator. (manual gearbox no fuel injection)
After start the motor runs perfectly normal, it responds to more

trottle
and

runs smoothly.
After about 30 seconds it suddenly almost dies and starts to run very
unstable or stops, hardly any responce to more throttle.

[cut]

Hi Lennart

I have the exact same engine as you in my '85 245 B230A. I have never
experienced that kind of sillyness from mine, but I thought of this:

Is the oil level in the carburettor correct - and with the correct oil?

Is the needle and membrane in the carb OK?

Is the fuel filter / fuel pump OK?

Is the vacuum hoses fine and not cracked?

If so, maybe there could be a more serious thing wrong. I am not a mecanic
so I won't scare you with guesses...
If you're up to it, I will suggest www.volvo240.dk with quite an active
forum. I asume you can write it in swedish or danish (or a mix ;o), and

I

am
sure you will get the help there - if not here.

Lycka till, grabben!

 

[Lennart]

Hi
I think I now have located my problem to the Hall element in the
distributor.
But then i runned into next problem, How to dismount the little metallic cup
which rotates and gives the pulses to the sensor.
I have removed the littel lock spring but the metal cup is stucked to the
distributor-axel and i havent found a method to remove it without risk to
brake it, anyone found a good method,
I also tryed with som heat from a small propane burner.
/Lennart from Sweden