Fuel milage decreased from 27 down to 20 replaced spark plugs last week all cly seem to be burning clean runs very rough when accelerating in the 50 to 60mph range then when nearing the 3/4 point of power band in the acceleration it seems to run smooth for a brief moment and the check engine light goes out for a moment and then comes right back on and running rough again
Hei, the most likely is a fault ignition cassette or injector nr 5!? If you have a scope and know how to use it, is easy to see where is the fault!
SOURCE: Check engine & traction control lights on
It might be the water temperature sensor for the brain not reading the right temperature, causes wrong parametres in the warming up periode, and then the diagnostic lamp will show.
SOURCE: 1988 saab engine trouble
I had simerlar problem with opel vectra which machanic said was fuel pump so replaced it and didnt work. Any how it turned out to be water in the fuel (it doesnt need to much) so i put 2 litres of methelated spirits and running good ever since. Hope this helps.
SOURCE: Saab 9-5 Aero Wagon 2000 wont restart when warm or after running
I have a 1999 Saab 9-5. I had a similiar problem. The car would always run cold. It would get hot and the engine would quit. It could be anywhere. One mile from start to 50 miles from start. Once it cooled down it would re-start but the cool down time was always different. Only difference for me was my car would crank, just not run. Replaced the crank position sensor ($60), no more problems! Good luck!
SOURCE: 1995 Saab 900 SE Convertible 2.5L V6 runs rough
Most likely air flow metre. Had same problem analysed and replaced and runs perfectly. Not cheap!
SOURCE: unknown error code and running issue
hi the DI pack could have one of the coils low on oil maybe then its shuting down uder load the early coil packs had replacable coils now its a sealed unit and thay seem to go wroung near or after 10000miles
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