1998 4.6 running lean on bank 1 and 2 - Mustang Evolution

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Old 11-20-2009, 08:23 PM   #1
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1998 4.6 running lean on bank 1 and 2

ok i got a 1998 mustang gt with the 2-valve 4.6......me and my buddy were going up to cleveland today on the turnpike around 85-110mph and on the way back from the cleveland going the same speeds the engine light came on and it read that bank 1 and 2 are running lean. what could be the problem of this? Tom im going to check the fuel rail pressure to see it it up to par but if it is what else could be cousing this problem?

also it sound like some ticking from the engine at lower rpm rang but when u get into it or keep the rpms say above 2500rpm there is no noise just say if im in 5th going 35 and i give it some gas it'll do it or running slow in second or third gear then give it gas(1/4-1/3) throttle it'll do it until he motor speeds up then it stops, or if im going say 70mph in 5th and i give it half throttle itll do it until the engine speeds up again. any ideas?

BTW car has 96,000miles and ust exhaust and cold air
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Old 11-20-2009, 08:27 PM   #2
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Re: 1998 4.6 running lean on bank 1 and 2

If I'm not mistaken....that'd be O2 sensors?
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Old 11-20-2009, 08:30 PM   #3
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Re: 1998 4.6 running lean on bank 1 and 2

also fuel filter has been replaced recently.......yes they are and would both o2 sensors go out at the same time?
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Old 11-20-2009, 08:35 PM   #4
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Re: 1998 4.6 running lean on bank 1 and 2

hey...it's a piece of machinery......ANYTHING could happen..lol
either the o2's could be kaput, or something IS making it run lean. Also, with that many miles, and running that hard.....the heat that thing is putting out could have affected something. How long did you run it?
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Old 11-21-2009, 02:09 PM   #5
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Re: 1998 4.6 running lean on bank 1 and 2

for about 20min from cleveland.....but i reset the ECU and it hasn't come on YET(knock on wood)....anyways i did the fuel rail pressure test and it read 30psi steady and peaked at 48psi with some gas....is this a problem?
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Old 11-21-2009, 03:20 PM   #6
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Re: 1998 4.6 running lean on bank 1 and 2

I wouldn't think that's a prob.....I've never messed with fuel pressure, but I'm pretty sure you'd have "so and so" psi at idle, and it'd go up as u give it more throttle. As for the codes being cleared, and not coming back so far, they may never come back, until you make a long hard run like that again. It may have merely been caused by the continuous heat and strain.
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Old 11-24-2009, 07:14 AM   #7
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Re: 1998 4.6 running lean on bank 1 and 2

You may have leaned your motor out running that fast with an aftermarket CAI and factory tuning. I know everyone says that your model year doesn't need a tune to run a CAI, but at WOT (or close to it) for 20 minutes...yeah, I think you leaned it out to the point that the ECU couldn't supply enough fuel to mix with the air. Since you reset and the codes have cleared, that sort of confirms it. Might look into a chip if you're going to run the car like that on a regular basis, otherwise you may burn her up.
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Old 11-24-2009, 12:53 PM   #8
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Re: 1998 4.6 running lean on bank 1 and 2

O2 sensors, and probably the fuel you used. Use a different ("no-name") brand, or use a different octane? If the car isn't tuned for anything other than 87 Octane than 87 Octane should only be used. If the car is tuned for like 91 Octane and you put in 87 or 89 Octane than that will cause hard knocking as well.

So yeah, my opinion: It was gas, explains all problems as far as I can tell.
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Old 11-24-2009, 07:01 PM   #9
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Re: 1998 4.6 running lean on bank 1 and 2

School me, Osiris: how would it be the O2 sensors? They measure the oxygen content in the exhaust, and since his ECU threw lean codes, that tells me they're working correctly. Running lean is an air/fuel mixture (spelled tuning) problem. I agree about running too low an octane count causing detonation, but octane has nothing to do with a lean mixture. If it's running lean, it's running lean no matter what octane he's burning. Not trying to start an argument...just wondering what I'm missing.
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Old 11-24-2009, 11:27 PM   #10
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Re: 1998 4.6 running lean on bank 1 and 2

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School me, Osiris:
Uh oh.....do I see another sig quote? rofl
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Old 11-24-2009, 11:51 PM   #11
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Re: 1998 4.6 running lean on bank 1 and 2

Hey Frog, that **** ain't funny!!!
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Old 11-24-2009, 11:58 PM   #12
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Re: 1998 4.6 running lean on bank 1 and 2

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Hey Frog, that **** ain't funny!!!

THAT is what makes it so damned funny!
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Old 11-25-2009, 08:46 AM   #13
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Re: 1998 4.6 running lean on bank 1 and 2

Yeah, I play right into it for you guys, don't I? Hey, I'm a good sport. Sometimes. When I remember to take my meds....
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Old 11-25-2009, 09:10 AM   #14
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Re: 1998 4.6 running lean on bank 1 and 2

If you still have the lean codes, check around for vacuum leaks.. spray some carb cleaner around your engine bay with engine running (the colder the engine is, the better, you don't want to catch the car on fire) if the idle changes drastically when the carb cleaner hits certain areas, there's your culprit.

Also, with the CAI your MAF could be contaminated with the oil from the filter - that would also trip a lean code, and cause the lower RPM issues you've described.. take the filter out, and spray the MAF contacts with electrical contact cleaner (do not use any other types of cleaners, as they can leave residue and make the problem worse, or damage other components) I use this one personally : http://www.crcindustries.com/catalog...sers/05101.jpg
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Old 11-25-2009, 06:08 PM   #15
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Re: 1998 4.6 running lean on bank 1 and 2

Hm, I should include that in my sig

I should have probably included a few more complete sentences in my last post. When I first said "O2 sensors..." I was referring to the OP's original question which was "What is Bank 1 and Bank 2 referring too?" So yes MM, the O2 sensors seem to be working fine.
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Old 11-25-2009, 07:33 PM   #16
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Re: 1998 4.6 running lean on bank 1 and 2

Like I said Osiris, weren't tryin' to start an argument. Be careful about including "that" in your sig; did I not just read a concession on your part towards what I said? What's that? MM is, OMG...right? Not to worry, I won't throw ya under the bus that way. Apologies to the OP for going off on a tangent.
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Old 11-25-2009, 08:22 PM   #17
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Re: 1998 4.6 running lean on bank 1 and 2

Concession no, clarification yes
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Old 11-26-2009, 09:09 AM   #18
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Re: 1998 4.6 running lean on bank 1 and 2

Semantics. Simply semantics!
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Old 11-26-2009, 09:37 AM   #19
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Re: 1998 4.6 running lean on bank 1 and 2

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Old 11-26-2009, 09:53 AM   #20
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Re: 1998 4.6 running lean on bank 1 and 2

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Semantics. Simply semantics!
This is true.
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Old 11-28-2009, 03:34 AM   #21
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Re: 1998 4.6 running lean on bank 1 and 2

got a new problem when i run the car hard like spinning the tires in the rain and sliding the car seems to eat coolant im guessing this is a head gasket problem? becuase there is no wet spots when parked.
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Old 11-28-2009, 09:10 AM   #22
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Re: 1998 4.6 running lean on bank 1 and 2

also is there any ways to test or find out were its leaking from without having to start throw out money i don't really have on replacement parts that might not even be the problem. it a chilly 50 degrees in ohio so the white smoke test i can't see working due to you can see the exhaust smoke due the cold weather. please any help is needed
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Old 11-28-2009, 05:54 PM   #23
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Re: 1998 4.6 running lean on bank 1 and 2

coolant pressure tester
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