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Idle problems when engine is warmed up. 900 1994

posted by  JoseB on  Sat Mar 26 18:57 CST 2011
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last visit: Wed May 22 13:38 CST 2013
[RELATED]

Look closely at this picture:

http://www.brickboard.com/FAQ/700-900/Exhaust.htm#AirInjectionValve

I had poor performance as well as failed the GA EPA smog tests. Took it to a reputable Euro specialist and they said the only thing they could do was slightly alter the camshaft timing with the camshaft/timing belt.

I started snooping around under the hood and could hear a slight pulsing air hiss, which turned out to be the three outlets in the rubber hose in the picture.

On my '94 940, the front fitting (closest to the radiator) on the rubber hose had a slight split and was leaking. The only part source that I could find was the dealer so bit the bullet and replaced the "hose". Problem solved. I also purchased 3 hose clamps and placed one around each of the three openings.

Problem solved and no more problems in 4 years.

I think the '94/95 model years were the only engines with the "pulse air" feature. Owned a 1975 Cosworth Vega that employed the same pulse air technique, but metal pipe/fittings were used in lieu of the rubber hose.






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