I have a 2003 subaru outback with a throttle response or acceleration problem that is making me lose my hair.

Asked by Mar 01, 2016 at 05:22 PM about the 2003 Subaru Outback Limited Wagon

Question type: Maintenance & Repair

When I pull up to a stop sign the revs drop to a normal idle. Then as I
attempt to pull away it just lugs and limps forward for about 6 seconds till
the rpms get to about 1100, then it jets off and accelerates like nothing is
wrong. if i flutter the pedal right at the point of contact it seems like it wants
to go/accelerate a little quicker. but if I floor it its like I dont even have my
foot on the pedal. Heres what I have done so far: I have a similar car that
runs great(2004 but the intake components seem identical) so I started
swapping parts off of the one that runs well thinking that I could locate the
broken component. I switched the Throttle Position Sensor first, then the
Boost Sensor next to it, then the Air Intake Control Valve thing opposite
those two parts. I looked all over the intake system for something that looks
like a Mass Air Flow Sensor but I CANT FIND ONE! the only thing with a
wire going to it is a temp sensor next to the air filter. I thought maybe
someone removed it during a hillbilly repair but neither motor in either car
has anything like a Mass Air Flow Sensor. WHAT THE EFF DO I swap
next? The code thrower said something like evap control solenoid (1443)
but everyone I have talked to says that cant possibly be affecting the
acceleration. If NAPA had had one I wouldve swapped it out anyweay.
HELP! I really am at a standstill. I would take it to the local shop but they
just did a 2500$ repair on an 800$ car without checking with anyone so I
really dont trust them. What should I do?

3 Answers

I am having the same problem with my 2004 outback. I'm getting a new coil pack, but could it be a bad fuel filter? Also, my check engine code reads that there is a bad O2 sensor. Could that be causing the problem?

20,445

Find another repair shop. It's very difficult to find a good mechanic, but, once you've found one, stick with that person. And, what did you pay $2,500 for? Cars today are way too complicated to just start guessing or switching them in a trial by error fashion. You need an excellent diagnosis..too bad that didn't happen. Good luck.

ok, so today I changed the coil pack and the plugs, and the wires... Still just as bad, I would love an excellent diagnosis. but so far I dont seem to have any diagnosis at all. Everybody has said TPS sensor and mass air flow, I swapped one and the other doesn't exist. I am thinking maybe its some kind of voodoo curse.

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