Volvo 340 B172 Feb 1988 Acceleration Anomaly

B14, B172, B19/200, D16 engine, ignition, cooling, fuel & exhaust system, gearbox, variomatic, final drive... | Tuning: engine swaps, welded diff, clutch upgrades...
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CBA
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Volvo 340 B172 Feb 1988 Acceleration Anomaly

Post by CBA » 05 Mar 2011 06:43 am

funky acceleration issue, instead of accelleration being a "straight curve", its wavy.. proper funky feeling. :lol:
any ideas.. this is a new one on me.

The more I press the accelerator the more it boings, its not under fuelleling, no misfires, its totally smooth, just boingy. :?
only does it occasionally.

could it be under fuelling.. I dunno. :(
:cry:


boing..


seizing component...


feels renixey.. :idea: , air leak somewhere.

boing.. timing +-...
cyclic vacuum+-'ing

sven360
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Re: Volvo 340 B172 Feb 1988 Acceleration Anomaly

Post by sven360 » 05 Mar 2011 07:53 am

Sounds like the zebedee effect.

Does it mainly happen on roundabouts?
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volvosneverdie
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Re: Volvo 340 B172 Feb 1988 Acceleration Anomaly

Post by volvosneverdie » 05 Mar 2011 09:12 am

Carb base air leak?
Theyre known for warping.
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CBA
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Re: Volvo 340 B172 Feb 1988 Acceleration Anomaly

Post by CBA » 10 Mar 2011 11:20 pm

hmm... all is good airwise, maybe I was lower of fuel than I thought.
not done it since.. :oops:

340pw

CBA
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Re: Volvo 340 B172 Feb 1988 Acceleration Anomaly

Post by CBA » 07 Feb 2013 01:33 am

Got it again.... zebedee effect.

It's down to a battered renix, need one.

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Chris_C
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Re: Volvo 340 B172 Feb 1988 Acceleration Anomaly

Post by Chris_C » 07 Feb 2013 08:31 am

Mine used to do a thing that felt like it was either full throttle or nothing, I guess that could be described as bouncy? Turned out it was a knackered crank sensor that was no longer waterproof.
'89(G) 340 GLE B172k
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast

CBA
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Re: Volvo 340 B172 Feb 1988 Acceleration Anomaly

Post by CBA » 07 Feb 2013 10:44 am

I'm stripping out the whole 'ignition system', it could be vacuum leak or its a ruined vac-sensor on the renix(does appear that way...) Shall know soon

CBA
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Re: Volvo 340 B172 Feb 1988 Acceleration Anomaly

Post by CBA » 07 Feb 2013 03:20 pm

This bit of old, split, perished, manky, cannibalised coolant pipe was my brake servo pipe 'connector adaptor'. Interestingly- The servo pipe fits the manifold perfectly without it. - now looking for the shortened coolant hose.....

It ticks over properly now and starts a damn sight easier when warm, doesn't surge and wane all the time - Win!

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CBA
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Re: Volvo 340 B172 Feb 1988 Acceleration Anomaly

Post by CBA » 22 Feb 2013 07:39 am

Still have a hunting tickover and occasional surging/waning at partial throttle.

I'm going to disconnect the vacuum to the renix+block the pipe.. somehow I don't think it is the renix though..

Any ideas/methods to eliminate/hunt down the cause would be handy right now.

I know my dizzy+cap is tip-top.
Fuel delivery is fine.
Carb I'm not sure about.

Ride_on
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Re: Volvo 340 B172 Feb 1988 Acceleration Anomaly

Post by Ride_on » 23 Feb 2013 08:26 pm

Should not afftect tick over unless its leaking. I'd suggest you block/pinch all the breathers. Another method is to spray WD40 around any joints and see if the tick over changes.
1980 345 DL_______1987 360 GLE (project car restored to GLT spec and B230FT'd)
1984 360 GLT______1987 360 GLT
1983 360 GLS______1989 360 GLE
1985 340 GL_______1986 340 1.4
1985 360 GLS______1995 940 SE 2.3 Turbo Estate (daily)
1987 340 GL 1.7

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Re: Volvo 340 B172 Feb 1988 Acceleration Anomaly

Post by macplaxton » 23 Feb 2013 08:44 pm

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CBA
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Re: Volvo 340 B172 Feb 1988 Acceleration Anomaly

Post by CBA » 24 Feb 2013 02:12 pm

I do remember my saloon doing over 40mpg on a run - this one is not.. more like 10!

It needs a proper revamp under the bonnet to get the economy back: I've got some bits of new vac/breather hose knocking about luckily :)

Clean everything + check everything = win.

Have a bit of gasket-in-a-tube to plug leaks temporarily, see if it will run right first.
But... the carburettor - it needs a rebuild too after the 150k, standing for ages n stuff - might rejet it for modern shitty air+petrol while I'm at it. Bendy Carb pmsl! I can have the carb and manifold resurfaced very cheaply if it's warped, and gasket-sealant it to test - cheers.

Procrastinating with 3 hours of daylight left.....

b******s to it! only got 'A' bit of sanding to do before g3 cut and a light coat of fresh paint all over. Welding is done tomorrow(hope it's not lapwelded..). Will get the mot eventually... why drive it in this crap weather, skin myself etc anyway? I deserve a rest (tells self "I am not a salmon!").

CBA
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Re: Volvo 340 B172 Feb 1988 Acceleration Anomaly

Post by CBA » 24 Feb 2013 08:22 pm

Postponed MOT to do more bodywork etc.

Got quite a bad propshaft rattle and vibration, what parts?

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