Hi Everyone,
I could use some advice concerning my Alfa 159 1750 TBI.
Stationary the engine appears to run fine at plusminus 800 rpm.
I can feel hiccups or subtle shakes, but no loss of power when I drive with the rpm's steady, for example at 2500rpm in third gear with cruise control at 50 km/hr or on the highway with the cruise set at 100 km/hr with rpm's about 2000.
When I accelerate in whatever gear, the car is a beast with no hessitation.
There are no fault codes and I do not have a clue about what parameters/live data could tell me. I use a registered version of MultiECUscan.
Last week, I replaced the last two of my four injectors after injector nr.4 was leaking. All injectors have been tested and the manifold gaskets are new. New spark plugs, new bobines(ignition coils). Air filter is also new...and ofcourse new oil and filter...again.
Tomorrow I will receive a new gasket for the vacuum pump, It's leaking very little oil, no droplets but enough.
I have had on two occasions failed injectors and both times it started with a hiccup and then fumes and then loss of power. On both occasions the error codes came and I replaced them.
The hiccups raise my bloodpressure. Now lately,I've been driving with a lot of acceleration to trigger a fault code. Thus far no dice.
I'm under the impression that a vacuum leak would cause more evident symptoms.
Can any of you help me trouble shoot?
Thanks for your time and Good weekend! Boyd, Netherlands