Volvo 340 1.7 splutters and cuts out

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Benparker
Posts: 2
Joined: 25 Jun 2019 08:28 pm

Volvo 340 1.7 splutters and cuts out

Post by Benparker » 03 Jul 2019 07:44 pm

Hi everyone
Any gone got any pointers would be greatly appreciated.
I have an 88 volvo 340 1.7 that has a lack of power when accelerating heavily or driving up hills.
Sometimes it will struggle up hills with barely any pressure on the pedal, but most of the time it bunny hops and can lose power to the point of cutting out.
It might start straight up again or take quite a few pumps of the pedal to get going then a fast idle for a while. I have not yet tested the fuel pressure, but will borrow a tester to use at some point.
so far i have replaced the plug leads and lead from the coil, the spark plugs, distributor cap, rotor arm.
I have refitted the original solex carburetor (as it had the 1.4 weber fitted when i bought it) and tuned it up.
I have confirmed the vacuum unit works with the engine running, as the engine revs rise when the vacuum is connected. I have tried a replacement renix, i have cleaned the coil contacts (both sides) and tested live and earth to the renix (9.4v cranking and 0.1 ohms) tested the flywheel sensor (289 ohms) and cleaned any particles on the sensor tip, and the coil (0.8 ohms across the two contacts and 6.8 ohms from contact to output). I have ordered a replacement flywheel sensor and coil to fit as the readings are both slightly out of spec per Macs fantastic guide to renix units.
Running out of ideas sharpish so looking for advice from anyone with more experience with these engines.

Many thanks
Ben

360beast
Posts: 832
Joined: 27 Dec 2013 08:40 pm

Re: Volvo 340 1.7 splutters and cuts out

Post by 360beast » 05 Jul 2019 11:37 am

Have you checked for vacuum leaks on the engine? Spray wd40 around it and see what happens.

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bogbasic
Posts: 1421
Joined: 21 Nov 2004 10:12 pm
Location: New Malden, Surrey.
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Re: Volvo 340 1.7 splutters and cuts out

Post by bogbasic » 05 Jul 2019 09:17 pm

Carb idle solenoid. Look no further.
1988 340 1.4 GL, 218k, 5 door (Grey Bess). Gone to CBA.
1991 340 1.7 GL, 64k, 5 door, petrol blue (Deep Blue).
1988 360 2.0 GLE, 140k, 5 door, ocean blue metallic (Blue Bess).
1989 340 1.7 GL, 108k, 3 door (Red Ness).
More info here!

Ride_on
Posts: 2240
Joined: 26 May 2009 05:34 pm
Location: Belfast, N. Ireland

Re: Volvo 340 1.7 splutters and cuts out

Post by Ride_on » 06 Jul 2019 02:12 pm

Might not be your problem but a common issue is weak spark caused by oil in the distributor. Seal placement is critical especially if there is a wear lip on the cam.
Usual symptom is stalling when pulling off at junctions.
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

Benparker
Posts: 2
Joined: 25 Jun 2019 08:28 pm

Re: Volvo 340 1.7 splutters and cuts out

Post by Benparker » 23 Jul 2019 02:43 pm

So i have managed to find a brand new idle solenoid in the Netherlands, so that went on. There is definitely a vast improvement, however there is still a splutter/lack if power if driving up hills or accelerating using over half pedal.
I have also recently changed the oil and filter to help smooth the engine out.
Struggling to keep interest in the car whilst it is running so badly, was hoping to take it to a couple of shows this year.
Ben

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bogbasic
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Joined: 21 Nov 2004 10:12 pm
Location: New Malden, Surrey.
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Re: Volvo 340 1.7 splutters and cuts out

Post by bogbasic » 23 Jul 2019 08:00 pm

Another common problem is air leaks from the carburettor gaskets - i.e. the ones that go each side of a spacer between the carb and the inlet manifold. Its quite easy to make your own with a cornflakes packet, or even some proper gasket material and this might give a further improvement. If you changed the gaskets when you did the carb, you can forget this one. Are the fuel hoses looking good? Poor fuel supply can cause the engine to get very weak.
1988 340 1.4 GL, 218k, 5 door (Grey Bess). Gone to CBA.
1991 340 1.7 GL, 64k, 5 door, petrol blue (Deep Blue).
1988 360 2.0 GLE, 140k, 5 door, ocean blue metallic (Blue Bess).
1989 340 1.7 GL, 108k, 3 door (Red Ness).
More info here!

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