When I completely accelerate my Subaru Baja it.

ANONYMOUS

MEMBER
2003 SUBARU BAJA
144,000 MILES

When I completely accelerate my subaru baja it hesitates when shifting from first to second and from second to third (it is an automatic transmission). If I accelerates normally the transmission changes perfectly. WE have changed spark plugs and wires, TPS, fuel pump and filter. It does not give any codes when it was scanned. The fuel pressure were within range 35 and 46. What can be the problem?

7 Replies

RANDICO

MECHANIC
174 POSTS

The Baja uses what I call a MAP (mainifold air pressure), the proper name per Subaru is intake pressure sensor, What this does is connected to the throttle body housing The ECM uses as indication of engine load and the ECM adjust fuel injector and ignition timing based on manifold pressure, So make sure no false air leak and suspect this sensor as the culprit

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Friday, February 15th, 2013 AT 3:25 PM

ASEMASTER6371

MECHANIC
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Do you feel it is trans related or engine related?

Roy

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Friday, February 15th, 2013 AT 4:20 PM

JORGEAGALLOZA

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3 POSTS

I think is engine related. The transmission shifts fine if I accelerated normally. Maybe electrical?

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Friday, February 15th, 2013 AT 4:24 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Hesitates? Does it top out on rpm? Will it keep accelarating after shifting?

Roy

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Friday, February 15th, 2013 AT 4:30 PM

JORGEAGALLOZA

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3 POSTS

Just before shifting it feels like it has not enough gas and it pauses, looses acceleration then shifts the gear and keeps accelerating until its ready to shift again. Also if I am cruising and step on the gas it does the same thing.