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Old 04-06-2010, 01:02 AM   #1
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Default P0171, p0303, p0353

These are the codes I pulled after I got home from work today. So, I went to the dealership and bought a new COP ($87.42), and replaced it. I buttoned everything back up and started it up. It ran fine until it came up to temp and then it started shaking and the check engine light came on. This time I just got P0171. So, I ran down to PEP BOYS and bought a can of MAF cleaner and cleaned the MAF according to the instructions. Fired it up and drove it around the block a couple of times. When I stop at a light or stop sign, the RPM's go down to about 300 and when I hit 40 MPH, the truck shakes pretty bad. So, I figure something's still not right and head for the house. I turn onto my street and the engine light starts blinking again. So now I'm back to square one. I just pulled P0171, P0303, P0353 again. All of this started after I tried replacing the plugs on the passenger side. 1,2,4,5,6,7, and 8 are all new and #3 is original (nut rounded off) but has a new COP.

I am at a total loss
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Old 04-06-2010, 06:16 AM   #2
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It's as easy as using Google....type in the code in the google search, and you have your answer.

P0171: http://www.aa1car.com/library/ford_lean_codes.htm this link tells you a lean condition on cylinder bank one (passenger side); too much air. Maybe you leaned on the air cleaner tube to the throttle body? Maybe you pulled a line off (vacuum)? Check all engine hose connections (vacuum, air intake, etc).

P0303: http://www.ford-trucks.com/forums/21...3-misfire.html this link to another forum says a p0303 is a cylinder 3 misfire. Is this the cylinder you replaced the COP on? If so, I'll bet this code will clear when you reset (remove battery cable, then replace, or use a code resetting tool).

P0353: http://www.bba-reman.com/content.aspx?content=DTC_P0353
this link also states an "ignition signal coil fault".

I think your poor idle has to do with the lean mixture (the p0171 code).

I'm betting you leaned on something while changing your plugs and cracked a line, tore a line, or loosened a connector/clamp that's allowing unmetered air into the intake, throwing the PCM off and causing a lean mixture.
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Old 04-06-2010, 10:17 AM   #3
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Thank you for the reply

Quote:
Originally Posted by Bucko View Post
It's as easy as using Google....type in the code in the google search, and you have your answer.

Believe me, I have googled, gaagled and gaggeled this problem

P0171: http://www.aa1car.com/library/ford_lean_codes.htm this link tells you a lean condition on cylinder bank one (passenger side); too much air. Maybe you leaned on the air cleaner tube to the throttle body? Maybe you pulled a line off (vacuum)? Check all engine hose connections (vacuum, air intake, etc).

This is exactly what I was thinking so I went back over everthing (2-3 times) Maybe I'm still missing something. I'll look again.

P0303: http://www.ford-trucks.com/forums/21...3-misfire.html this link to another forum says a p0303 is a cylinder 3 misfire. Is this the cylinder you replaced the COP on? If so, I'll bet this code will clear when you reset (remove battery cable, then replace, or use a code resetting tool).

Yep, that's the one. That code did go away after I replaced the COP but it came back last night when I test drove the truck (after cleaning MAF)

P0353: http://www.bba-reman.com/content.aspx?content=DTC_P0353
this link also states an "ignition signal coil fault".

I think your poor idle has to do with the lean mixture (the p0171 code).

I'm betting you , leaned on something while changing your plugs and cracked a line, tore a line, or loosened a connector/clamp that's allowing unmetered air into the intakethrowing the PCM off and causing a lean mixture.
This sounds completely logical and is where I need to start (again). Remember, #3 still has the orginal plug in it because the nut rounded off on the plug. This cyclinder is the only one that wasn't shiney aluminum around the plug. It is brownish/black (some sort of corrosion). If it was steel, I would say it's rusted but...it's not.
So, during all the grunting, pushing, and pulling on the # 3 plug I guess I could have "leaned on something while changing your plugs and cracked a line, tore a line, or loosened a connector/clamp that's allowing unmetered air into the intake". That's my starting point when I finally get home tonight!

The truck was running fine on Saturday. Sunday is when I changed #4 plug and tried to change #3. It's been all downhill and deep into the wallet since then. $140 for scanner, $87.42 for COP, $17 for MAF cleaner and new set of torx bits,$16.95 for Snap-on socket P/N BEXD181 ...on top of the $112 for the plugs and $70 for the Lilse tool (with I thankfully haven't had to use on the first 7 plugs). The $396 for spark plug change and $96 for each one that breaks quoted from the dealer is sounding better and better each day!!!

Thanks again

Last edited by g8rfan; 04-06-2010 at 11:05 AM.
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Old 04-06-2010, 01:44 PM   #4
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ttt
Bucko has some good advice that I plan to follow. Just bumping this back up to solicite more advice/recommendations.
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Old 04-08-2010, 12:17 PM   #5
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I looked around and haven't found any obvious breaks or cracks. I plan on spending all day after work tomorrow looking more thoroughly. It just seems odd that the truck was running fine on Saturday and then all I did was change some spark plugs and all this happened. Can this be caused by simply unplugging something? Everything is plugged back in and I rechecked them all.
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Old 04-12-2010, 11:17 AM   #6
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Update:

Friday I cleaned at the terminals and checked all the wires and lines. Buttoned it all back up and cleared the previous codes (P0171, P0353, and P0303). Took it for a test drive and all was cool for a few minutes. Then all of a sudden it started to get the shakes and shutters and the MIL started flashing. Limped it home and checked the codes. Now I have P0171, P0316, and P0303)

Yesterday I used the extra COP that I have and tested for spark. I engaged the fuel inertia switch to stop fuel from going to the cylinders and then connected the extra COP to #1 COP plug. I had my son crank the engine a couple of time and saw strong spark. I then reconnected #1 and did the same test on #3. The first time there was faint spark about every other cycle, the second time there were a couple of good sparks and then nothing and, the third time....nothing.

I rechecked the wires coming out of the #3 COP plug and cleaned the PCM terminals.

Any thoughts?

From my Actron CP9575:

VIEW FREEZE DATA
P0171 (MOD $00)

MIL STATUS OFF
ABSLT TPS (%) 18.4
ENG SPEED (RPM) 0
CALC LOAD (%) 0.0
MAF (LB/M) 0.00
COOLANT (F) 189
IAT (F) 104
IGN ADB 10.0
ST FTRM1 (%) 56.3
LT FTRM1 (%) 0.0
ST FTRM2 (%) 56.3
LT FTRM2 (%) 0.0
VEH SPEED (MPH) 0
REL FRP (PSI) 44.19
FUEL SYS 1 OPEN
FUEL SYS 2 N/A
REL TPS (%) 5.5
THROT CMD (%) 9.0
02S11 (V) 0.000
02S21 (V) 0.020
ST FTRM21 (%) 56.3
02S22 (V) 0.100
MIL DIST (MI) 0
VPWR (V) 11.905
OBD2 STAT CA
Click the image to open in full size.
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Old 04-12-2010, 09:53 PM   #7
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As bad as it hurts to do so maybe u should take it to a mechanic.
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Old 04-13-2010, 01:45 PM   #8
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Quote:
Originally Posted by Turkey Hunter View Post
As bad as it hurts to do so maybe u should take it to a mechanic.

I was 5 minutes from giving up! I ended up using a piece of leftover 3/4 inch oak flooring and wedged it under the firewall and on top of the breaker bar in order to keep heavy pressure on the socket while I slowly turned it and it FINALLY budged

No codes last night or this morning...
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Old 04-13-2010, 06:36 PM   #9
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you must mean you got the #3 plug out and replaced it....
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Old 04-13-2010, 07:11 PM   #10
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Oh yeah, I've been researching and posting on a couple of sites. I got 7 out of 8 plugs replaced last Sunday and it took me until last night to get #3 out. I had to use a Snap-on deep well extractor because the plug was actually welded (electrolysis ?) in the plug cylinder. There was probably 1/16th to 1/8th inch of buildup and the nut had rounded off as a result of me not knowing it before I started torquing on the ratchet.
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