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Jerking upon acceleration 900 1995

posted by  Philip on  Wed Jul 13 06:16 CST 2005
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last visit: Thu Oct 23 10:21 CST 2014
[RELATED]

My daughter's 940 turbo idles OK, but if you try to accelerate more than the slightest amount, the engine starts bucking violently. RPMs drop down and back up. If you back off, it stops. (It stopped doing this at the end of a 200 mile trip, but then returned over a couple of days.)

I have:

replaced fuel filter
filled tank with gas
put in bottle of techron
resoldered FI relay
swapped fuel pump relay
swapped fuel pressure regulator
swapped AMM
inspected all and replaced some vacuum hoses
inspected turbo hoses (replaced one)
swapped coil
checked fuel pressure at rail
pressurized system at turbo inlet (hearing air under intake manifold, but not finding a hose problem, I replaced intake manifold gasket)
replaced two idle motor hoses


I am about ready to take it to a shop! Does anybody have any other ideas?
Thanks for any suggestions.





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