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Oxygen Sensor?

Tiny
RONSMUSTANG
  • MEMBER
  • FORD MUSTANG
I have a 1990 Mustang 5.0 with about 75,000 miles on it.

When I start it, it won't continue to run unless I play with the accelerator. Then after it's warmed up a bit it runs, but roughly. It also sometimes pops like a carburator on acceleration.

Codes 91 and 41 on bank 2 come up on an analysis. I am guessing an oxygen sensor?

Ron

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Tuesday, April 24th, 2007 AT 6:43 PM

2 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Yes, those are both o2 sensor codes. If there arent any mechanical problems with the engine, I would start there
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Wednesday, April 25th, 2007 AT 7:51 AM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
For what it matters, I ran through to trouble tree on it, not that is always the answer to a problem :roll:

But it starts with checking the fuel pressure to make sure it's in spec. And holds for 60 seconds with key on engine off. I think the spec is 35-45 psi, but don't recall.
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Wednesday, April 25th, 2007 AT 9:29 PM

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