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Discussion Starter · #1 ·
so i've been bringing this '74 volvo 144 back to life...<p>it's got the same 240 CIS fuel injection system, and actually, she runs GREAT at high speeds, but just has a REALLY ROUGH idle, just stumbles when in Park, and almost dies when you put her in gear or come to a stop sign.<p>i've checked the cold start injector and the thermal time switch, and both seem to be fine. the air filter's not too bad, and the inline fuel filter is new, at least. (i'm working on replacing the in-tank filter as well.)<br>she starts really pretty well when cold, but seems to be a little harder to start when warm (though it may just be my imagination).<p>i tried spaying carb cleaner around the injectors/seals to see if the idle would pick up and it would detect any leaks, but didn't notice any difference. i'm not really familiar with this stuff (i've owned carbureted vehicles for a long time)...don't really know what to try next.<p>do we eliminate the fuel distributor, line pressure regulator, control pressure, auxiliary air valve and whatnot because she runs so good when not at idle, or ? <br>should i just go ahead and replace the seals for good measure? (it looks like they're available for about $6/each). or is that a big job that may not need to be untertaken?<p>and what's this little electronic switch thingy directly underneath the idle speed adjusting screw?<p>anybody want to hazard a guess at the most likely culprits, or have any other tests/ideas?
 

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Discussion Starter · #3 ·
Re: ROUGH idle in my '74 (gdill2)

yep. original engine + CIS fuel injection system. any ideas?
 

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Re: ROUGH idle in my '74 (pelos)

The fuel injection systems on the B20 in the '72-'75 era were early efforts by Volvo to control emissions while providing improved fuel economy and increased driveability. With some success.<p>If this is to be a daily-driver 140 consider a switch to twin SU HS6 carbs or a single downdraft carb set-up.<p>George Dill<p>
 

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Re: ROUGH idle in my '74 (gdill2)

I can't say definitively, but I'm pretty sure thet Lee's Volvo will have to pass smog tests in perpetuity in Oregon (poor guy). Oregon used to say that a 20+ year old car dropped off the smog radar, but some years ago they fixed the year at 1974... permanently. Ugh.<p> Don't ask me about the emissions from my 1968 144s... ask the cursing drivers behind me! ...and yes, they *were* behind me... just look at my insurance premiums <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/tongue.gif" BORDER="0">
 
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