Question about 1986 Volvo 760

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I've problem with my twin 40 DCNF turbo !

I made my vw golf mk2 turbo last week, And I've to say I used my twin Weber 40 DCNF 12 to deliver my fuel, so now I've problem with fuel delivery at full throttle, At normal RPM and begging of the boost it works ok, but when RPM goes beyond 6000 my A/F ratio gauge goes to LEAN part and I can feel the car is running out of fuel, This problem starts at second gear and continues on other gears, I also have to say I used the 4bar fuel pump and Adjustable fuel pressure regulator but I can not adjust it to solve this problem, If I change the regulator setting I'll loose the low RPM rev, For more information I've to say My boost is set on 9psi, If you think I've to change the webber settings or main jet size or fuel pump and regulator so please let me know .

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6ya6ya
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Posted on Jan 02, 2017

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chiquititas
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SOURCE: 85 740 GLE Non-turbo stalls when put in gear or push on accelerator

Its really sounds like the throttle switch, chack him.

Posted on Jun 17, 2008

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JMMARRERO59
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SOURCE: '93 940 no turbo engine stuck at max RPM

YOU IDLE CONTROL VALVE IS GOING BAD ON YOU. TRY TO CLEAN IT BUT BEST TO JUST REPLACE. LOCATED UNDER INTAKE MANIFOLD

Posted on Dec 30, 2008

shinehutt
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SOURCE: hello i have a 1998

shinehutt_2.gif recheck the wires make sure the wires are in correct order hope this helps

Posted on Jan 14, 2011

  • 17 Answers

SOURCE: vovo 2003 s60 , I

no, you shouldnt have to clean it every week. it sounds like your pcv system is clogged. you have to replace the pcv box and hoses. and clean out all of the gunk clogging up the ports in the block. and it is probably a good idea to replace the intake manifold gaskets and the injector seals. also there is a banjo bolt on the bottom of the intake manifold that gets clogged up so clean the banjo bolts and all attached hoses

Posted on Jul 15, 2011

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VW what car?
what year>?
no model, no year,
no joy.
are these custom carbs? if yes, NO ONE CAN answer that.
because.
Jets are tuned for YOUR engine alone.
if all this is true,then get the weber book, huh? and read it.
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the webers are the most difficult to tune but on the other hand they are the best. (less compromise , makes great racing carbs).
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on stock carbs the idle has a mixture screw.
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ever.
join a car forum for your car, then find custom carb section
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same is true with EFI. (speed density) but not air density EFI.
see.... ?


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