P0174 won't go away

4DoorBlackTop

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Threw this code last week. The car frequently died in stop and go traffic. At one point wouldn't start at all, like a dead fuel pump. I changed the fuel sensor, drivers 02 sensor, put in fuel injector cleaner, had the gound wire for the boost a pump messed with... wasn't completely grounded.

The car no longer dies, but still throws the code. Takes about an hour of driving to pop up.

Thoughts as to how to fix the car?
 

4DoorBlackTop

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Also code P0171 comes up too, but it takes a day or two. I also cleaned the MAF and yet cannot find a vacum leak.
 

justbob

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Sounds like the car went into fail safe mode from reaching max fuel trim do to a vacuum leak. Check the simple things like hose clamps, and PCV.

Sounds like you are allready on the right track, keep up the search.
 

gnxs

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Was the code referencing a specific "bank"? I see you changed the driver side 02, was that the side getting the code. Not familiar with the 02 arrangement on your car, but P0174 is typically an O2 sensor or tuning related issue.

Like somebody said, sounds like you're on the right track.
 

Zack

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I told him to clean the IAC because it has 200k on it and I dont remember If I cleaned it or not.

He did last night and so far so good as he reported to me.
 

gnxs

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I told him to clean the IAC because it has 200k on it and I dont remember If I cleaned it or not.

He did last night and so far so good as he reported to me.
You da man Zack.:bigthumb:
 

4DoorBlackTop

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So far so good. The car runs too good to have a boost leak or vacum. Cleaning the iac made a difference. We will see what happens. Just hit 192K last night!
 

gnxs

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So far so good. The car runs too good to have a boost leak or vacum. Cleaning the iac made a difference. We will see what happens. Just hit 192K last night!
Good to hear. :bigthumb:
 

4DoorBlackTop

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The code is back. Come to think of it none of this happened until after I got rear ended a few weeks back. My money is still on the fuel pump or a lose wire in relation to the fuel system. Car completely died last night before cleaning the iac. Acted like it ran outta gas. Slowly dropping in rpms no matter what I did with the gas petal, till it died. It would turn over, but wouldn't fire up. Gave it 5 min and it started. Gave it 3 hours and I was driving home.

What's the deal?
 

Tbone63

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The code is back. Come to think of it none of this happened until after I got rear ended a few weeks back. My money is still on the fuel pump or a lose wire in relation to the fuel system. Car completely died last night before cleaning the iac. Acted like it ran outta gas. Slowly dropping in rpms no matter what I did with the gas petal, till it died. It would turn over, but wouldn't fire up. Gave it 5 min and it started. Gave it 3 hours and I was driving home.

What's the deal?
Vacuum in the tank? Maybe your gas cap isn't venting properly.
 

4DoorBlackTop

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I will findout Sunday thanks to Zack! I am sure its fuel related. I hope its a stupid simple fix.
 

Jon01

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You're going to be giving Zack hummers all the way to the pearly gates at the rate you're going Dom.
 

Zack

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Pulled the plugs and they were all WHITE from running lean.

O2's are making voltage, no vacuum leaks.

I had a few SC pipes off and noticed they were rusting on the inside.....how does that happen??? Dont know dont care. I cleaned the MAF, cleared the memory in the pcm and put it back together.....wasnt gonna do any more since it was cutting into my BBQ time.
 

4DoorBlackTop

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Car seems okay, but I know something still isn't right. Either way the car will not see track time until this issue has been properly addressed. Kudos to Zack for taking the time to help me. The search continues.
 

4DoorBlackTop

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I will change the fuel filter, clean the plugs see what happens. If that doesn't solve the issue I will change the other 02, but according to Zack it sounds like the other 02 would be a waste of time and money.
 

Silverback

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Dom you mentioned this may have started after being rear ended. I would suggest that you investigate the fuel tank pumbing, fuel pump, fuel shut off switch (in trunk) and the fuel module, also in trunk. Don't know what to say as to how but it seems logical to me.

Good luck.

Pat
 

4DoorBlackTop

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I have been saying fuel pump since the car died. I guess you and me are the only ones that are concluding this.
 

Zack

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I have been saying fuel pump since the car died. I guess you and me are the only ones that are concluding this.
Put your wideband in thats been collecting dust and buy some gauges and start figuring stuff out on your own. :drums:
 

Zack

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The FP Duty cycle was at 16% at idle....which says the fuel filter is not clogged and the pump is not struggling.
 

justbob

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The FP Duty cycle was at 16% at idle....which says the fuel filter is not clogged and the pump is not struggling.
Curious, was that while it was acting up? Mine took just over a year to bite the dust. Never failed, EVERYTIME I datalogged the car was fine. Of course, not only was the FP sporatic as all get out, but also atleast one COP. Both issues haunted me for over a year, before I did something I never ever do, and that was give up and throw parts at it... FP fixed most of all of my troubles (overheating I reccon?) The other was faulty COPs, but not as severe. The car felt like a fighter jet after that.

Dom, I already told you how stupid easy the AFR is to hook up. Don't delay and have to pay the piper. Sorry I am so busy right now, but not responding back with a cool or at least a fuck you was kinda rude. Give me a week and a half and I can do it, or get it done elsewhere, whatever, I could care less. But I do care about you and your sanity if you were to blow a hole in a piston...
 

4DoorBlackTop

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Bob, sorry I didn't respond. I actually completely forgot and had more on my plate than I could handle that week. So again, sorry I forgot to get back to you. The car seems okay right now, but I suppose I will have a better understanding of everything when I have the wideband installed.

Btw I put the old bigger fuel filter back in that Zack put in. Someone showed me a trick I had to do orally... the filter was fine.
 

justbob

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Not a problem. Hopefully late next week I can get you in. Where are you mounting it? I suggest the A pillar so you can see it without having to look down. You can get a dual upper add on thru summit or jegs in before install if you order now.
 

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