Ford F-150 - 1997-2003 :: Shuttering Pretty Alerting Under Light Load At 35 - 45mph - Codes P0302 And P0171
Mar 5, 2013
I have a 1998 F150 5.4L 4WD with 192k mi on it. Recently ( suddenly ) the vehicle began shuttering pretty alerting under light load at 35 - 45mph. The engine idle was intermittently smooth then rough. I quickly drove the truck home and ran a Trouble Code check with my Autoxray EZ-scan 4000 and found the two trouble codes P0302 and P0171. I have checked for vacuum hose cracks and found none.
Replaced the fuel filter, PCV valve, and cleaned the MAF sensor ( dirty ).
Right after cleaning the MAF sensor the idle remained smooth - but stumbling immediately when put in drive. Driving at 35-45mph still exhibits intermittent shuttering and occasional very short bursts of what feel like complete engine shut-down. This all is evident under light to moderate load .
At this point what would you recommend ? Replacing the O2 sensor bank #1 ? Or is there a possibility maybe the EGR valve is faulty - or another vacuum valve somewhere ? Intake manifold leak ?
The severe stumbling and very short complete engine shut downs would indicate that maybe the computer is failing or it's a fuel delivery issue? What rational steps to take next ?
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I have a 2000 f150 with 5.4 Triton with 165k miles. I did invest in a code reader. It started missing and code P0302 came up along with P0171. Put new coil on #2 and truck ran fine for a few days. Then it started to run rough again. Shaking, Idle rough, no power and CEL came on again. This time code P0171. I changed out fuel filter to no avail. My next step was to start looking for vacuum leaks. As I'm searching, All I am finding is trucks with this problem also get P0174 code. My question is since I am only getting lean on one bank does that pretty much eliminate things like MAF or the famous elbow vacuum leak and make something that only affects one bank like an O2 sensor on CAT more likely?
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2001 F150 5.4L Triton Motor. Everything seemed o.k. then got the Engine Service Light. Checked with reader and above codes only appeared. Read numerous articles/videos and pulled the PCV hose/boot assembly and replaced the whole thing with oem part. Visually checked for disconnected tubing = none found. After this and with the new hose assembly in place I performed a reset. With the scanner still connected restarted engine and read values: ST FTRM1&2 = -.08~+2.3, both oxygen sensor voltages are varying and the LT FTRM1&2 hang around +26 and +28.
From what I understand the ST seems o.k. but the long term is WAY OUT OF WHACK. Started it up again and took carb cleaner spray and covered all the connections I could see = no change in engine rpm. No cracks in the air cleaner body. Big plug to the MAF was inserted and plugging the hole. I am thinking of making a smoke "machine" and trying that or removing the hoses from the throttle body and plugging the holes in the throttle body and see if that clears them up. IF it does then connect one by one and keep checking the values. Lot more work but I am at a loss.
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2002 F150 - 5.4 ... So just bought this truck about a month an a half ago. No problems but the other day the SES came on. It is showing P0171 and P0174. And P0000 (almost forgot that one) was told that's generic though. Haven't really noticed a difference in the way it's running. Has been extremely cold here in WV but the only thing I can notice (or think I notice) is the gas mileage has gone down a little. After reading some on this forum I'm looking for a vacuum leak correct?
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I'm lost. Got P0171 and P0302 ... 2006 4.2 V6 5-speed 220K ... Got bad miss ...
Compression check was good.
Replaced plugs.
Replaced wires.
Replaced coil pack.
Cleaned MAF
Miss remains. What do I do next?
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I have a 99 f150 with the 4.2l v6 with a 5 speed 173000 miles. I picked it up not to long ago. When I first got it it had both the P0171 & P0174 lean on bank 1&2 it was also siting for a while. I replaced the fuel filter which was filled with black fuel, also changed the PCV valve, cleaned the MAF sensor, and changed the oil. I cleared the code, drove it for a little bit and the light came back on after 20 miles.
I then proceeded to replace the upper and lower intake manifold gaskets. Upon doing that i noticed that i was missing one of the linkages for the IMRC. I went to the junkyard and pulled off another linkage rod off the same motor. ordered new plastic clips, put the IMRC on cleaned everything up and began putting it back together. I also cleaned the Injectors while i had them out as well and put in new spark plugs and wires.
Put everything back together. code was cleared since the battery was disconnected. drove it and then the engine light came back on again. this time it was only the p0174. so i then both the upstream and downstream O2 sensors on bank 2, reset the code and it came back on again. I'm lost.
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Have a an 11 f350 6.2 gas throwing p0171 and 0174. Driving the truck it has spark knock pretty bad. Ive parked it at this point. Its a tow truck so I need it fixed and back on the road. I've checked the hoses going to the pcvs they appear to be ok.... Also upon starting the truck it just sounds weak.....
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My 97 F150 4.6 4x4 threw a P0302 and P0401 the other day, I traced the miss fire to a loose injector plug. I reset the codes last weekend, I got in the truck and went to the Dump and to town to pick some stuff up. It threw the EGR code again, so this morning I did a little checking on the EGR I cranked the truck and disconnected the FPR vacuum line and hooked it to the EGR valve and the truck died down but didn't completely die.
Now the green line that went to the EGR valve felt like it had a slight bit of pressure coming from it. Is this normal? I did pull the white feed line from the EGR Regulator and it had good vacuum.
The regulator also makes a humming sound when you cut the truck off. Ill be pulling the alternator this weekend due to it going out last night, while I'm in there if Ive got to pull the throttle body id rather do it while I'm elbow deep in it. So does it sound more like a Clogged Throttle body or a Faulty sensor?
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Ok, so this past week i towed my 72 f250 to IL from CA. 2100 Miles. 6100#s with the trailer. No problems at all. Got about 9 MPG too the whole way. Ok, so here is my problem now. As some of you may know, IL just got about a foot of snow. Its all slush at this point. I am living in the country right now so i drive thru alot of it. Ok, now you know the back story, today i drove the truck to my brothers house, put it in park and bam! check engine light came on. About a half hour later i drove it to AutoZone and had them check the codes. Here is what they pulled.
P0705
P0171
Need to know what to replace. I have to drive it back to CA in 4 days.
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So I have a 1997 ford f150 v8 4.6 2w... I got codes p0171 and 174 my truck seems fine till the idle drops, it's weird when I have it on park it's fine if I turn the wheel left the idle drops when the ac turns on the idle drops and it's wasting crazy gas. Where should I start first in finding this problem?
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So, my 2003 F150 4.6 that I just put back on the road after a four month break is running like crap. I took it off the road for the winter because it was missing (no codes) and didn't feel like dealing with it then but after running it for a day the CEL comes on. It shows the following:
P0304 - hoping it is a coil pack
P0456 - pending. Gas cap?
P0171 - pending. One bank too lean?
Does the 171 code possibly have to do with the misfire in Cylinder 4? I know it is impossible to tell yet but am hoping there is a potential connection.
Before I parked it in January, it was running a bit rough and stumbled on acceleration but never would show a code. Now all this. Going to change the coil first, tighten the gas cap, check for leaks and see what happens but is there anything common on these trucks that I should also be looking at?
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The "service engine soon" light on my 2003 F150 Supercrew 4.6L (225k miles) just came on. The code it's throwing is P0171.
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I've recently purchased a 02 F-150 4x4 with 135k showing. About a week after purchase 4 COP's were replaced to eliminate a skip that started the day I drove it home. After a few hundred more miles it started shuttering at take off, much the same as the trans shuttering usually in higher gears/speeds. Only does it briefly in 1st gear and occasionally it goes into 2nd, but stops immediately after shift. After about 10 miles it stops doing it and until the trucks sits awhile it stays gone. About the same time a popping sound started coming from the rear axle at slow speeds. It changes sides as you drive and turn, and sometimes goes away intermittently altogether. Also is it possible or probable the two are related ?
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I just bought a 99 f150 and the check engine light came on with code p0171,system too lean bank 1. It runs and drives fine but has a strong smell of gas when I shut it off.
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2003 Sport Trac. My car was not starting, told my fuel pump, replaced twice and nothing. Found out about inertia switch and changed it, now car runs.
Before this switch blew out my car was running perfectly, no check engine, nothing. Now i have changed my fuel pump twice and put a brand new fuel filter in and soon after i get lean codes P0171 and P0174. My fuel pressure is 60psi at idle and drops to 0 after about 30 seconds when the car is shut off.
A lot of my intake is new since i did have a vacuum leak before, so i do not suspect that is it, especially since this happened after the new fuel pump. I am completely stuck as to what i should do. And i get hesitation when trying to accelerate sometimes
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Kia rio 2006 130461 today I went and got gas right when I pulled out light began to flash and car shaking went to auto zone codes p0302 and p0326. I had knock senor changed 2 months ago . What could be the problem the guy said I just need a tune up . Is this true ? Is my car safe to drive car not shaking now and no changes in function of my car. There no way I can any one to look at it for couple begin tomorrow sunday.
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Coming home from spring break towing the TT, the Check Engine light illuminates. Seems to be sputtering at idle, but otherwise OK, so we continued home.
Scanner lists the P0171 and P0174 codes. Ok, where to begin? based on internet info, started by cleaning the MAF sensor and throttle body. When I pulled apart the intake, noticed that the grommet which feeds the MAF in the air intake had become separated letting air bypass the MAF. Hence the reason for the codes.
If you get these codes, check the grommet for the wires feeding the MAF in the air intake to make sure it hasn't become separated from the intake. No more codes.
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2003 Ford Explorer, with P0171 and P0174 codes, common problem, as I have read. I pulled the cover over the engine off, and I immediately found the likely problem. There is a hose/connection that runs from the valve cover on the right side, about 6 inches behind the oil fill tube across and looks like it comes into the Carb. Where it turns to come into the carb is a rubber elbow. This elbow has a hole in it. Temporarily I have used electrical tape, but when I run the vehicle, I see the elbow begin to collapse. I believe the elbow is getting weak with age, plus the hole/tear doesn't work. Anyway, what i the part number, or what this is called. Hoping Advance Auto, or Napa will have it, just don't know what it is called, and can't figure out the part number. Otherwise I will pull it off tomorrow and take to advance and see if they can match it.
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I have a 97 F150 4.2l auto 4x4. The truck seems to surge or hesitate at pretty much all speeds. I have had the truck on fords so-called super "sbds" computer and they found nothing. I am taking it tuesday to have the o'2 sensors and CAT. Convertors checked at a local parts/service store. Also found out today that my speedometer is 5 mph to slow (doing 65 but speedo only registers 60).
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I have a 1999 Ford V-10 Triton 6.8L engine with 100,000 miles in my Motorhome. Service engine soon light has been a problem for the past couple months. I have replaced the O2 sensor on the passenger side and the EGR valve. After that I drove for about 300+ miles continuously and stopped to get gas. Light stayed off and I thought I had it fixed but after starting up again the light came back on. The codes are P0171 and 0174.
I had the air filter replaced before changing the sensor and valve and mechanic left the Mass air flow sensor out of the socket I had a sluggish engine and at the time I thought I sucked water into the filter, I was driving in a pouring rain, this sensor plugs into the air intake above the filter correct?) I plugged that back in. What is my next move because I reset the service engine soon light and it runs great then the light comes back on after I shutdown and restart.
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I have a 2008 XL 4.2 auto trans with 60,000 miles on it. We purchased a new travel trailer with a total weight just under 5000 lbs that we pulled for about 2000 miles this summer. On the last trip we noticed the truck was missing pretty bad going up hills or under load. After we got home I started to notice the miss at times even not towing. Did a tune up with Motocraft plus and wires and seems to still have a miss at an idle and very low RPM. What would be best to check next?? Would Coil be logical?
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