turbo on, no power
Posted: Thu Feb 20, 2003 1:49 pm
1993 turbo auto with 90K miles. Tranny is fine except for a soft 3rd
gear shift, engine doesn't speed up just a slow shift. Thinking of
trying the resistor higher shift pressure thing.
Porblem:
sort of comlicated symptoms but hear me out.
For a month now the engine seems to bog down at low RPM and medium
boost (medium acceleration, half throttle). re 2,000 to 2800 rpm with
5 inch vac to 4 lbs boost engine power seems flat. As soon as the
rev's hit 3,000 power comes on nice. When its bogging it seems to
surge slightly, apparently only noticible to me, the Subaru mechanic
I'm sure thinks I'm going nuts. I also noticed a slight hissing sound
when on boost. Mechanic said my up pipe may be leaking but I can't
hear any exhaust noise otherwise ($500 experiment I want to be sure
of). Gas milage has dropped 70+m / tank but may be from hitting it
harder now with the flat spot.
I have replaced, fuel filters, spark plugs and wires, valve timing
belt, air filter, and had a injector / engine power flush treatment.
No change.
1-What and when, triggers the fuel enrichment loop? Is it gradual or
on off?
2-The hissing sounds more like a intake leak to me but can't hear
where its coming from when buddies hit the gas with me under the hood.
3-Turbo seems to be working fine, lots of boost at low RPM and steady
at 8 to 9 PSI all the way up when I've got it to the rug.
4-Should the transmition be down shifting in this situation and if so
what triggers this, throttle position, engine vacuum / boost,
transmition torque, ?? I bought the car last Sept and didn't have the
boost guage until a couple months ago. I remember the tranny not
downshifting too easily but the engine 'had' lots of low end grunt.
Starts easily cold or hot and idles fine. I'm in Toronto and we've
been at -15F many times so far this year (too many times for me).
Any clever ideas?
Thanks
George
gear shift, engine doesn't speed up just a slow shift. Thinking of
trying the resistor higher shift pressure thing.
Porblem:
sort of comlicated symptoms but hear me out.
For a month now the engine seems to bog down at low RPM and medium
boost (medium acceleration, half throttle). re 2,000 to 2800 rpm with
5 inch vac to 4 lbs boost engine power seems flat. As soon as the
rev's hit 3,000 power comes on nice. When its bogging it seems to
surge slightly, apparently only noticible to me, the Subaru mechanic
I'm sure thinks I'm going nuts. I also noticed a slight hissing sound
when on boost. Mechanic said my up pipe may be leaking but I can't
hear any exhaust noise otherwise ($500 experiment I want to be sure
of). Gas milage has dropped 70+m / tank but may be from hitting it
harder now with the flat spot.
I have replaced, fuel filters, spark plugs and wires, valve timing
belt, air filter, and had a injector / engine power flush treatment.
No change.
1-What and when, triggers the fuel enrichment loop? Is it gradual or
on off?
2-The hissing sounds more like a intake leak to me but can't hear
where its coming from when buddies hit the gas with me under the hood.
3-Turbo seems to be working fine, lots of boost at low RPM and steady
at 8 to 9 PSI all the way up when I've got it to the rug.
4-Should the transmition be down shifting in this situation and if so
what triggers this, throttle position, engine vacuum / boost,
transmition torque, ?? I bought the car last Sept and didn't have the
boost guage until a couple months ago. I remember the tranny not
downshifting too easily but the engine 'had' lots of low end grunt.
Starts easily cold or hot and idles fine. I'm in Toronto and we've
been at -15F many times so far this year (too many times for me).
Any clever ideas?
Thanks
George