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Old 01-02-2013, 11:58 AM   #1
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Need Help

I have misfire on cylinder 1 2 5 6 7 and 8. With codes PO174 PO316 PO300
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Old 01-02-2013, 12:22 PM   #2
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Anyone with any ideas?.. :/
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Old 01-02-2013, 12:51 PM   #3
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Any other symptoms ?
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Old 01-02-2013, 01:05 PM   #4
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Any other symptoms ?
Stalls, sputters, really rough idle. One of the codes that popped said Running Lean.
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Old 01-02-2013, 01:19 PM   #5
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I have misfire on cylinder 1 2 5 6 7 and 8. With codes PO174 PO316 PO300
p0174 is for the maf
p0316 misfire during first 1000 revolutions
p0300 random/multiple misfire


looking at the codes i'd say either the maf is dirty beyond belief or busted. check the maf wire and clean it first...remember to only clean it using a proper can of maf cleaner which is sensor safe
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Old 01-02-2013, 01:23 PM   #6
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Originally Posted by 1slosix View Post

p0174 is for the maf
p0316 misfire during first 1000 revolutions
p0300 random/multiple misfire

looking at the codes i'd say either the maf is dirty beyond belief or busted. check the maf wire and clean it first...remember to only clean it using a proper can of maf cleaner which is sensor safe
Well it also had a running lean code too. But ya im gonna give that a try too. Thanks
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Old 01-02-2013, 01:24 PM   #7
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the maf can cause the lean code too just a heads up
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Old 01-02-2013, 02:03 PM   #8
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the maf can cause the lean code too just a heads up
If the MAF was going bad, isn't there a separate code for that?.. By the way I cleaned the MAF with the cleaner and now it won't fire. It stills cranks though. But I think my battery is just getting to low.
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Old 01-02-2013, 02:20 PM   #9
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charge up the battery then try to fire it up...and you are throwing a maf code
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Old 01-02-2013, 02:26 PM   #10
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Originally Posted by 1slosix
charge up the battery then try to fire it up...and you are throwing a maf code
Ya I'm going to throw it on the charger overnight and try it again in the morning. I can see what your saying about the other codes being thrown because of the MAF. But isn't there a complete separate one for just the MAF itself?.. Or do those codes just double for the MAF too?..

And thanks again for the help.
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Old 01-02-2013, 02:36 PM   #11
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p0174 is a maf code basically...it's a probable cause
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Old 01-02-2013, 02:57 PM   #12
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Ok thanks b
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Old 01-02-2013, 11:48 PM   #13
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P0174 and p0171 are lean codes bank 2 and 1 respectively. Could be a maf sensor however a vacuum leak or cracked manifold could also cause the same......
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Old 01-03-2013, 01:19 AM   #14
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Quote:
Originally Posted by Eturner View Post

Stalls, sputters, really rough idle. One of the codes that popped said Running Lean.
Do you have a tune?
I had similar probs
(Idle up and down between 1.5k - 200 rpm
Would shut off when idling etc was running lean)
Took of the tune and runs better then the horrible tune previous owner gave me
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Old 01-03-2013, 02:15 AM   #15
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Possibly alternator ?, my truck thur crazy codes when the alt went out.
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Old 01-03-2013, 05:57 AM   #16
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Do you have a tune?
I had similar probs
(Idle up and down between 1.5k - 200 rpm
Would shut off when idling etc was running lean)
Took of the tune and runs better then the horrible tune previous owner gave me
Yes but it's the same tune that's been in it for the past 5 years.
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Old 01-03-2013, 06:08 AM   #17
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I had the p0174 & p0171 codes anf all it turned out to be was a bad coupler behind the maf. It was letting extra unfiltered air into the engine. Only a 10 doller part from advanced.
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Old 01-03-2013, 08:28 AM   #18
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Originally Posted by 9tee7pony View Post
I had the p0174 & p0171 codes anf all it turned out to be was a bad coupler behind the maf. It was letting extra unfiltered air into the engine. Only a 10 doller part from advanced.
Ok so now an update. After cleaning the MAF yesterday and charging the battery all night, my car will crank but will not start.
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Old 01-03-2013, 01:49 PM   #19
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Ok like I said, it will now crank but not start. I kinda thinking fuel filter maybe?.. Also does anyone know if the MAF would cause these problems too?..
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Old 01-03-2013, 02:00 PM   #20
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Ok like I said, it will now crank but not start. I kinda thinking fuel filter maybe?.. Also does anyone know if the MAF would cause these problems too?..
Seems like the MAF would not keep it from starting. Seems like that would just be rough idles, poor running, etc. You might be right about the fuel filter. It could be clogged enough to effect your fuel pressure. I think there is a shrader valve on the fuel rail where you can check the fuel pressure. You should be able to borrow a fuel pressure check setup at your local auto parts store. Are you getting any new codes now that its turning over, but not starting?
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Old 01-03-2013, 02:20 PM   #21
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Seems like the MAF would not keep it from starting. Seems like that would just be rough idles, poor running, etc. You might be right about the fuel filter. It could be clogged enough to effect your fuel pressure. I think there is a shrader valve on the fuel rail where you can check the fuel pressure. You should be able to borrow a fuel pressure check setup at your local auto parts store. Are you getting any new codes now that its turning over, but not starting?
All codes have been erased because I disconnected the battery last night to charge it. I'll have to check for that valve though and see what's what.
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Old 01-03-2013, 03:11 PM   #22
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Can anyone tell what exactly the shader Valve looks like, and you it be directly on the fuel rail itself?..
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Old 01-03-2013, 04:01 PM   #23
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Shrader Valve looks similiar to a tire valve, Correct guys?
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Old 01-03-2013, 04:03 PM   #24
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Shrader Valve looks similiar to a tire valve, Correct guys?
Yup
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Old 01-03-2013, 04:11 PM   #25
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It should look similar to this. Mine is on the passenger side toward the front. In assuming yours would be the same.

Attachment 83960

The system will be pressurized, so be careful. There is a depressurization procedure, but I don't know it off the top of my head. You might check one of the stickies in the 79-95 Mustang forum. I think somebody put a procedure for checking fuel pressure. Even though they are 5.0 pushrods, it might help give you an idea what to expect. I believe they do not have a schrader valve to attach to as we do.
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Old 01-03-2013, 04:11 PM   #26
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...disconnect the battery, or it might be unplug the sensor in the trunk. Can't think of what they call it but it detects if the cars upside down, I believe. Sorry, I'm at work right now, Lol.
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Old 01-03-2013, 04:24 PM   #27
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I had the code P0174 and it turned out that my cold air intake coupler where it meets to the throttle body was cracked and I replaced it and very thing was fine. Hope you find out what's up
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Old 01-03-2013, 04:32 PM   #28
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So after looking at my car, and doing some other research, it appears the '04 GT doesn't have a Schrader valve. Lol. Looks like ill have to get some special tool to plug into the line to check the pressure.
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Old 01-03-2013, 04:42 PM   #29
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So after looking at my car, and doing some other research, it appears the '04 GT doesn't have a Schrader valve. Lol. Looks like ill have to get some special tool to plug into the line to check the pressure.
Oops, sorry bro! Mine has one and I assumed they all did. Hopefully that is something you can borrow from a local auto parts store.
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Old 01-03-2013, 05:13 PM   #30
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Oops, sorry bro! Mine has one and I assumed they all did. Hopefully that is something you can borrow from a local auto parts store.
Ya all my other cars had one too.
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Old 01-03-2013, 08:07 PM   #31
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You can unplug the maf an see if it will start. When the maf is unplugged it uses inferred parameters calculated by the PCM. Is the PATS theft light in your dash flashing fast? Could be a PATS problem such as a bad key or loss of code from transponder in your key. 04 should have a fuel pressure sensor on the fuel rail. You can use a scanner to monitor the fuel pressure with that. Otherwise I do believe it should have a schrader valve. You could have looked at the fuel trims also to see if they are positive a ton. My guess is the lean codes and misfire condition is from a lack of fuel. Could be pump or plugged filter. Could be out of time as well. Good luck.
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Old 01-03-2013, 08:33 PM   #32
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You can unplug the maf an see if it will start. When the maf is unplugged it uses inferred parameters calculated by the PCM. Is the PATS theft light in your dash flashing fast? Could be a PATS problem such as a bad key or loss of code from transponder in your key. 04 should have a fuel pressure sensor on the fuel rail. You can use a scanner to monitor the fuel pressure with that. Otherwise I do believe it should have a schrader valve. You could have looked at the fuel trims also to see if they are positive a ton. My guess is the lean codes and misfire condition is from a lack of fuel. Could be pump or plugged filter. Could be out of time as well. Good luck.
I know it's not the PATs, already been down that road and had three new keys made. Lol. I've already had my scanner hooked up to it and the only codes that popped where just the ones I listed at the beginning of this thread. I'm going to try changing out the Fuel Filter and see what that does, but I'll also try starting with the MAF unplugged first. I can hear the pump kicking in so that should be good. From what I've seen and what most everyone else has said it seems that it's either the Filter or MAF.
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Old 01-04-2013, 07:30 AM   #33
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Well if it doesn't start with the maf unplugged then that is not your problem. Unplugging it takes the maf out of the calculation for fuel and air delivery. Then it is inferred. U probably have a fuel delivery issue. Fuel pump or such.
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Old 01-04-2013, 07:44 AM   #34
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Well if it doesn't start with the maf unplugged then that is not your problem. Unplugging it takes the maf out of the calculation for fuel and air delivery. Then it is inferred. U probably have a fuel delivery issue. Fuel pump or such.
But there is a problem if it doesnt start without the maf since even without the maf the car uses air density to run the car. We can ise the maf or not since our cars ise 2 methods of reading air inlet. Maf and speed density of the air.
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Old 01-04-2013, 07:46 AM   #35
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Correct but the maf is not the problem then.
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