Volvo RWD 140-160 Forum

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144 backfiring 140-160

posted by  Kathie on  Sat Mar 2 16:19 CST 2013
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last visit: Tue Apr 16 10:14 CST 2013
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We have put all new fuel injectors, refurbished gas tank, new plugs,rotor, cap and wires.
The car starts fine, idles rough and when accelerated it back fires.
Wondering if it is the timing. Is it anti clock wise or clockwise for the firing order?? It is a 20F engine.
Any help or ideas would be apppreciated!! Thanks!







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144 backfiring 140-160

posted by  Phil S. on  Sat Mar 2 17:41 CST 2013
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last visit: Fri Oct 24 13:18 CST 2014
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Rotation is CCW, and the firing order is 1-3-4-2.








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144 backfiring 140-160

posted by  Kathie on  Sun Mar 3 13:53 CST 2013
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last visit: Tue Apr 16 10:14 CST 2013
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Thank you.. I did do this and the idle is rough still and it is backfiring out the exhaust. It starts fine. I am baffled with it.








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144 backfiring 140-160

uid 779's pic
posted by  matt b on  Sat Mar 2 16:46 CST 2013
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last visit: Tue Oct 14 16:33 CST 2014
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I'm guessing ignition timing.

But, it'd be good to know if it back fires out the exhaust, or the intake. I'm guessing intake, as that's more likely under accelleration.

Loosen that 7/16 bolt that clamps the distributor just a bit, start the car, and rotate distributor until idle smooths out. Test drive. Repeat, until it's happy.

Could be the advance mechanism isn't functioning properly.



--
-Matt I ♥ my ♂








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144 backfiring 140-160

posted by  Kathie on  Sun Mar 3 13:54 CST 2013
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last visit: Tue Apr 16 10:14 CST 2013
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Thank you Matt. It is backfiring out the exhaust. I tried adjusting the timing... not sure if I am doing something wrong.. From what I understand, it is Counter clockwise. It starts right up, but idles rough and backfires out the exhaust..







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