Question about 1984 Volvo DL

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Car loses power while driving and jerks while it's trying to accelerate but cannot,as I press pedall to the floor.Completely slows to a crawl on the freeway and almost stops but engine does not die.Then suddenly gets burst of power for short moment then sputters out and resumes slowing.This happens consistently on traveling forward.Sounds like sputtering.Have taken to a mechanic who replaced many components.Even some so called computer or electronic parts on a this 1984 volvo dl.Im sure he also checked fuel line and other aspects to do with fuel flow.It's some very cryptic,arkane problem he was not able to remedy.Maybe you know of common secret problems wich may be the culprit.Thank you.

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The mass air flow can cause these symptoms

Posted on Dec 27, 2008

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Perhaps the Carburettor just needs a clean of all the soot and old oil build up. Go to a motor factors or ebay and get some Carb cleaner. 
Find Two pieces of old rags. 
And an old chisel or wide screwdriver.
With the car engine OFF.
Undo the air pipe attached to the side of the Carb. Get a small piece of rag and open the vent fin carefully . Put a piece of rag just to top anything going down into the inside of the Carb. 
Spray some carb cleaner around the inside circle and clean the excess build up of oil . Remove the rag and rap a bit of it around the head of the chisel or screwdriver. 
Open the fin carefully again ... 
Spray some carb cleaner in one side and whilst holding the fin open with your finger start wiping the inside with the rag on the chisel . Wipe as much of the excess oil build up as you can safely do until the inside if the carb is clear as possible. 
Give it another spray with the carb cleaner . 
Start your engine up and give it a bit of throttle. 
Knock the engine off again and replace the Air pipe securely.
Every few fill ups of fuel put in some Petrol Cleaner . 

This did my wife's S40 really good.

Posted on Feb 07, 2015


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