Random stalling

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MichelSep
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Random stalling

Post by MichelSep » Tue Jun 12, 2018 8:37 am

Hello Guys I'm in desperate times with the problem I'm having. The RPM of my 2.0 decreases to a point where it might stall sometimes. This only happens when I clutch and, for example, have to wait at a red light. I decrease my speed and clutch, then the RPM's will bounce between 600/1200. 90% it won't stall but when I activate my airconditioning the RPM will further decrease and the engine stalls 50% of the time. Braking and stearing also seem to be a trigger because when I put it in neutral, whilst rolling out, and want to steer it up my driveway this also seems to happen(without AC on). After the 3 seconds of bouncing it seems to stable itself.

Normally it idles reasonable around 1000 and really minor jumps. I've already cleaned the, I think you call it a MAF, and that seems to be okay. The alternator has the right values when idling, using the brakes and AC didn't affect it, nor the battery. After stalling it will start immediately.

Where can I start? Thanks!

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jamescarruthers
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Re: Random stalling

Post by jamescarruthers » Tue Jun 12, 2018 9:20 am

I'd start by looking at the micro switches on the throttle body in particular the one that operates as you come off the idle stop. This is the one that tells the idle air bypass valve‎ to operate.

Put your ear to the throttle body‎. When you open the throttle the tiniest amount, you should hear the switch click.



And vacuum leaks, although these would make the fault pretty continuous, not intermittent like you have. ‎
1987 Volvo 480 ES, 507274, 217 - Red (Ness)
2006 Citroen C6 Exclusive 3.0 petrol/LPG
2008 Mini Cooper convertible (Mau)

Previous 480's:
J123 CFU -- ES
J449 MNL -- ES auto
D864 CPV -- ES
L691 JFC -- Turbo
F70 MNR -- ES
H858 FGV -- Turbo auto
E981 KHM -- ES (509849)

MichelSep
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Re: Random stalling

Post by MichelSep » Tue Jun 12, 2018 10:12 am

jamescarruthers wrote:
Tue Jun 12, 2018 9:20 am
*‎
I'll check that out. The problem is driving me mad. I'm still thinking it is a electrical problem because of the randomness in it.

Could it belt related? I don't hear it slip but I am nearing the intervaldate.

frenchfries
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Re: Random stalling

Post by frenchfries » Tue Jun 12, 2018 7:18 pm

You might get lucky. Had the same symptom and it turns out that a pipe was dislodged in the engine bay.

See this link for a picture, it was near the throttle body: viewtopic.php?f=11&t=35605
1993 Turbo auto called Skip for the important stuff
2011 Juke 190 for everything else

MichelSep
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Re: Random stalling

Post by MichelSep » Wed Jun 13, 2018 7:09 am

frenchfries wrote:
Tue Jun 12, 2018 7:18 pm
You might get lucky. Had the same symptom and it turns out that a pipe was dislodged in the engine bay.

See this link for a picture, it was near the throttle body: viewtopic.php?f=11&t=35605
Was it also leaking oil from that point? Might explain something.

frenchfries
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Re: Random stalling

Post by frenchfries » Wed Jun 13, 2018 8:02 am

I don't think so, it was a vacuum pipe.
1993 Turbo auto called Skip for the important stuff
2011 Juke 190 for everything else

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dcwalker
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Re: Random stalling

Post by dcwalker » Wed Jun 13, 2018 5:10 pm

Have you double checked the basic things as well:

- is the Idle Control Valve clean?
- is the throttle valve housing clean?
- what state are the distributor cap and rotor arm in?

Also, do you know there is a very primitive but nonetheless effective error code store on these cars? You'll find info on here or the main site about the codes and how to read them using the reader on the LH front suspension pillar. Or people on here will advise you if you can't locate it. That might give you a clue as well...

Good luck!

David
Current: 1994 480 GT, 1996 460 CD & 1997 440 LE with lots of optional extras & 2007 V50 SE Sport
Previous: Celebration 331 (re-homed with Richard S), Celebration 467 (returned to Martin Mc); Celebration 346 (re-homed with Alan480); Celebration 269 (scrapped abandoned project), Celebration 73 (sold on after 6 years), 1992 ES, 1988 ES - and numerous other non-480 Volvos!

MichelSep
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Joined: Wed Sep 14, 2016 5:06 pm

Re: Random stalling

Post by MichelSep » Thu Jun 14, 2018 7:32 am

dcwalker wrote:
Wed Jun 13, 2018 5:10 pm
Have you double checked the basic things as well:

- is the Idle Control Valve clean? Yes, cleaning it doesn't matter.
- is the throttle valve housing clean? Haven't cleaned that one yet.
- what state are the distributor cap and rotor arm in? Don't know

Also, do you know there is a very primitive but nonetheless effective error code store on these cars? You'll find info on here or the main site about the codes and how to read them using the reader on the LH front suspension pillar. Or people on here will advise you if you can't locate it. That might give you a clue as well...

Good luck!

David
Thanks for the advice! Once the vacation starts i'll check the things on this list. Now I am going to look at the reader for this car.

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brinkie
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Re: Random stalling

Post by brinkie » Thu Jun 14, 2018 7:39 am

I have had the same problem, replaced the idle control valve completely and the stalling stopped. Get them cheap here:
https://www.ebay.de/itm/LEERLAUFREGLER- ... 1134031872
Replacement is a 5 minute DIY job.

But the real problem in my case came from the fact that cilinder #2 had almost no compression left. I would recommend having the compression of all cilinders measured.
Robert.

Present cars: 1994 Volvo 480 GT 2.0i, 1999 Volvo S70 2.5 Europa, 2010 Volvo V70 2.0F Momentum

Alan 480
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Re: Random stalling

Post by Alan 480 » Thu Jun 14, 2018 3:20 pm

Doubt if you can get a code reader to plug in :-) (well James I think bought one)

it is VERY basic and you count flashes of the LED :wink: then look it up


I've had similar, and I'm with James, check that the throttle switch under the throttle is working, it can get filled with oil form above , ie any oil breathing through the crankcase tends to run down throttle body shaft into switch, or the small pipe across from front of manifold to sensor at windscreen wiper motor, it can split (it was on ours) as already suggested by frenchfries
Alan

480 ES 2litre 'Celebration' ? , C30 1.8ES, SS1

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