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Volvo 340 1.7 splutters and cuts out

Posted: 03 Jul 2019 07:44 pm
by Benparker
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

Re: Volvo 340 1.7 splutters and cuts out

Posted: 05 Jul 2019 11:37 am
by 360beast
Have you checked for vacuum leaks on the engine? Spray wd40 around it and see what happens.

Re: Volvo 340 1.7 splutters and cuts out

Posted: 05 Jul 2019 09:17 pm
by bogbasic
Carb idle solenoid. Look no further.

Re: Volvo 340 1.7 splutters and cuts out

Posted: 06 Jul 2019 02:12 pm
by Ride_on
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.

Re: Volvo 340 1.7 splutters and cuts out

Posted: 23 Jul 2019 02:43 pm
by Benparker
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

Re: Volvo 340 1.7 splutters and cuts out

Posted: 23 Jul 2019 08:00 pm
by bogbasic
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.