Hesitation/slow acceleration, low/rough idle

Tiny
TYLER RC
  • MEMBER
  • 2002 SUBARU OUTBACK
  • 2.5L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 165,000 MILES
Title says it all, my vehicle will hesitate to move then when it does move it slowly accelerates up until thirty mph then it is like I get a nitro boost and the car speeds up then drives normal until I slow down or stop then it starts idling rough and sometimes it even stalls out. Any help would be great! I have replaced ignition coil, wires, spark plugs, air and fuel filters, and put a new MAF sensor in it. The fuel filter kind of fixed it for a week, now back to square one.
Saturday, June 23rd, 2018 AT 3:12 PM

4 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,822 POSTS
This sounds like a classic weak fuel pump, but to be sure lets take a fuel pressure reading. You can rent a gauge for free from an auto parts store. Please follow this guide and get back to us.

12V at 300 kPa (3.06 kg/cm2, 43.5 psi)

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Please run this test and get back to us.

Cheers, Ken
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Monday, June 25th, 2018 AT 12:27 PM
Tiny
TYLER RC
  • MEMBER
  • 2 POSTS
Shop said it was catalytic converter. Do you know about how much that is going to cost me? I just need a rough estimate so I am not overwhelmed when they get done with it.
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Monday, June 25th, 2018 AT 12:31 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I am Danny.

I do know the companies Flowmaster and MagnaFlow do make aftermarket catalytic converters but, a big problem is it can be really hard purchasing in the state of California. Tough California smog laws out here make it hard. In California you cannot even purchase used as they are destroyed. Dealership can offer replacements as well but can be pricey. Hope this helps!
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Tuesday, June 26th, 2018 AT 3:53 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,822 POSTS
It should cost between $600.00 and $800.00. Here is a guide to help you get an idea of what you are in for when doing the job:

https://www.2carpros.com/articles/catalytic-converter-replacement

Please let us know what happens.

Cheers, Ken
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Tuesday, June 26th, 2018 AT 10:59 AM

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