Volvo 340 - Acceleration problems

Hi,

I have a volvo 340 1.4 litre engine with electornic ignition and experiencing irregular acceleration problems. When accelerating in any gear, the engine will not rev smoothly as I accelerate. It appears as the engine is mis-firing or short on petrol. With the choke out a little way, it helps with acceleration and the engine runs a little better, but not yet 100%. If I stop the engine, wait a few minutes and start the engine again, the car accelerates smoothly and I have full power again. The next time I start the engine acceleration would be problematic again. The problem began several weeks after I replaced the spark plugs, leads, petrol filter and air filter. The carboretor has been cleaned, but that did not help. I am not sure if it is an electronic issue or air finding its way into the system some where.

Any thoughts?

Reply to
Mike_V
Loading thread data ...

experiencing irregular acceleration problems. When accelerating in any gear, the engine will not rev smoothly as I accelerate. It appears as the engine is mis-firing or short on petrol. With the choke out a little way, it helps with acceleration and the engine runs a little better, but not yet

100%. If I stop the engine, wait a few minutes and start the engine again, the car accelerates smoothly and I have full power again. The next time I start the engine acceleration would be problematic again. The problem began several weeks after I replaced the spark plugs, leads, petrol filter and air filter. The carboretor has been cleaned, but that did not help. I am not sure if it is an electronic issue or air finding its way into the system some where.

Ignition problems are often mistaken as short on fuel, it could be one of the items you have replaced with a faulty unit. It is always important to use good quality ignition components as these are highly stressed electrically.

Insulation break down - Causes hesitation/misfire on acceleration. The weak spark that remains after some of the energy has leaked to ground somewhere other than the plug, is not strong enough to ignite a large volume of petrol, but seems ok at tick over.

Check the engine at night with your eye accustomed to the dark and look for glowing or arcing round the the high voltage components. Also try putting the old parts back in to see if is a problem with the new parts or perhaps the way you have assembled them. (eg coil cable routing)

-- Tony Stanley ++Always Learning++

Reply to
Tony Stanley

I'd be putting alot of (monopoly) money on crap in the carb thats being sucked into a passageway or jet during running and partially starving the engine of fuel. When you switch off the debris floats away until next time when its sucked into position.

Tim..

Reply to
Tim (Remove NOSPAM. Registry corupted, reformated HD and l

Tony,

Thanks for the advice. Last night I checked the engine and found that sparks were leaking from what appeared to be the spark plugs of the first 2 cylinders closest to the radiator. I replaced both spark plugs and checked again. I did not see the blue sparks this time. I will test drive it today and hopefully the problem has been resolved.

Thanks once again. Mike.

Reply to
Mike_V

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.