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Old 07-04-2007, 01:39 PM   #1
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Default 2000 SSEI running lean

I already replaced one of the o2 sensors and had the car hooked to a Mac scan tool and both of the sensors are reading with specs. Changed the fuel filter, then checked the fuel pressure (42psi key on engine off) and about 44-46 running. I work at Advance Auto Parts where I bought a new Master brand fuel pump and installed it only to have it put out the same pressure. Thought it was a defect so I took it back and put the OE pump back in. Car runs fine, but for the first 100 feet or so after starting it seems to want to spudder like ie is running out of gas, btu after that it runs great. It is never hard to start but it does alway idle up and down when you start it until you rev it. Any help on this issue would save me from putting a wrench through her forehead!! Thanks guys
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Old 07-05-2007, 03:00 AM   #2
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You may want to start with a good throttle body and MAF cleaning. Procedure is in techinfo if you need it. Done plugs and wires lately? I assume when it was hooked up to the scanner, there were no codes listed?
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Old 07-05-2007, 10:38 AM   #3
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I'm going to assume you had a P0171 Lean Bank One code. ???
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Old 07-05-2007, 07:13 PM   #4
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yes it was a p0171, and i had the plugs and wires replaced with the factory wires aand platium plugs. had the injectors professionally cleaned also.
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Old 07-05-2007, 09:00 PM   #5
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Platinum plugs are a no-no in a supercharged engine. Start by replacing them with either Copper (plain) or Irridium.

Never Bosch.

Lean Bank 1 is a phantom code. BillBoost will guide you through it, but for starters, make sure none of your plug wires are touching the O2 sensor or it'* wiring harness.
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Old 07-05-2007, 11:03 PM   #6
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Lean bank 1 is not a phantom code. There are specific issues that cause your maf to read weak etc..and it'* a real problem that the FSM gives diagnostics for..then you talk to Foghorn and become an expert on it.

Your problem isn't the O2'*..it'* not the plugs or wires..it'* electrical most likely. Check your connections at the battery..and make sure by pulling off both cables that they are clean. Last 00 owner with this code had a bad post in the battery.

ps..I'm the P0171 king. Search on P0171 with me in the person field. You'll get more info. You'll have it fixed up in no time.
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Old 07-05-2007, 11:44 PM   #7
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Most members in this club run either NGK TR55 copper spark plugs or Autolites 104 copper spark plugs. Irridiums are much more expensive and there is nothing to really gain from using them.

Copper plugs are $1.50 to $2.00 each
Irridium plugs are $6.00 to $10.00 and not much to gain!
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Old 07-06-2007, 08:32 AM   #8
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The gain on Iridium is the longevity of the plug. Most of the active posting members talking about plugs daily are changing them frequently for their applications.

Iridiums should give a good 50-80K before needing to be changed, while a copper based plug will give 20-40K. Both could use a maintenance of gapping during that service life, however not many pull plugs to check, gap and reinstall.
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Old 07-06-2007, 09:21 PM   #9
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well I am going to look for both of these problems on sunday and I will keep you guys posted as to the results. Thanks a million for the info, at least it is somewhere else for me to explore.
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Old 02-18-2008, 06:48 PM   #10
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Default DTC Code 171 Bank 1 Lean

I just changed out my Idle Air Control Valve and Mass Air Flow Sensor on my 1997 Bonneville SE because it wouldn't start. Now that it runs I get a DTC code of 171 - Bank 1 Lean.[u] A young techy at Schucks suggested changing out an O2 sensor. Does each cylinder bank have its own O2 sensor?

My Chiltons states there are only two oxygen sensors on my engine, a single wire oxygen Sensor and a heated oxygen sensor. These don't seem to be bank specific. Anyone have any suggestions?
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