Santa FE SM (2001-06) :: Codes PO171 And PO401 - Car Starts To Bounce A Little Until Let Off The Gas
Mar 16, 2013
I am getting two codes, p0171 and p0401. Both point to something with the fuel are mixture I believe. My problem is that I can not figure out what the problem is. As far as I can tell there is not a vacuum leak. My MAF sensor looks clean and close to brand new. The codes come on and the car seems to want to jump. It does not stall, just starts to bounce a little until I let off the gas. And it does not do it until the car is warmed up. 2001 Santa Fe .....
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I have a 01 f150 7700 with a 5.4L and its throwing codes po135, po155, po174, and po171. Here is the history, last year had same code and found it was a bad ELLBOW on pcv hose, replaced and that fixed it, I also had a crack on egr valve and I replaced that too. This Jan truck was running bad in the morning and I traced it to a bad idle air controller, replaced it. I got a code and guy said I had a bad pcv valve so I replaced it.
About 3 weeks ago check engine light came back on with the 4 codes listed above, I replaced both front o2 sensors, 250,000 mile so I thought that was it but came back same code, I took it to a local mechanic and he said that the intake gaskets need replaced, but he call me later and said I had no leaks on the intake and that he did find another vac leak. He didn't charge me anything and sent me on my way.
I drove the truck about 50 miles and same codes back, so to recap I have cleaned mad sensor, replaced both front o2 sensors, a new egr valve, a new idle air control, pcv valve, pcv hose and ELLBOW, don't know what to look at next. Any clues?
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Ive got a question for all you code readers out there. My dreaded check engine light has been on for about a month. I bought a code reader recently and checked it out. Two codes come up; PO401 and PO446. What these mean. My book says "Exhaust Gas Recirc. Flow Insufficient Detected" and " Evaporative Emission Control System Vent Control Circuit Malfunction". Which sensors, location on vehicle, etc..... this is a 97 5.4L Expedition.
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1999 ranger 3.0. Check engine light popped up showing P1000 and P0401 codes. I think the p1000 is a system readiness test. Not sure why that came up and the 401 is exhaust gas problem. I put on a new autozone DPFE a few months ago..
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03 Alero 2.2 with no maf sensor.
I have both codes 141, 171. I am trying to figure out if I should just change rear oxygen sensor or something else.
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Everything started with the typical lean bank 1 and bank 2 codes. I started at the basics change fuel filter PCV Hose & Valve clean the MAF changed air temp sensor(it was cheap). Still had same po171&po174 codes. Bought a obdll reader. After 3 weeks of nothing being accomplished I bit the bullet and took it to Ford for a diagnostic and they said it was definitely the intake gaskets.
I changed the gaskets and now this has gotten worse! I started the truck after reassembly and it ran like crap!
Checked everything and everywhere and could find nothing wrong. I then took off the vacuum line to the EGR and everything smoothed out. I didn't mess around and replaced the EGR the DPFE and the vacuum solenoid.
It still runs like crap especially at idle. I did the tests with my digital meter and found the vacuum solenoid is calling the EGR to be open all the time. I suspect that this would be the fault of the PCM? What should be my next course of action?
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I have a 1.8l 1zzfe that has been rebuild because of the oil consumption problem. Right before it was rebuilt, it became extremely sluggish and was popping po300, po302, and po171 constantly. When the motor was torn down #2 cylinder had a burnt valve, rings were stuck, and carbon everywhere. All bearings were in spec, but they were still replaced. Pistons, rings, timing set, and plugs were replaced. I am still getting a sluggish acceleration, and popping codes po171, and po300. I have tested the injector resistance, seemed ok. Tested spark, seems ok. Tested the wiring harnesses, cleaned the maf, intake, and checked all of the vacuum lines. Not sure what to try next?
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2002 F150 5.4 v8,,, I had troubles just over a month ago with a po305 code. i got the truck fixed with 2 new coils n some gaskets. I am having these po353 & po171 codes pop up now. The truck is running rough and I am curious to if its just another coil problem or if their is something I am overlooking or just don't know about?
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I tugged on the little hose on the back pass. side of the engine,(5.4),...
and I could hear the vacuum leak that is apparently causing the erratic idle, and PO171 & PO174 to come up.
I know this hose is hooked to the Charge motion Control Valve on the back of the manifold,..I can't imagine what it does, as it terminates with some kind of plug or check valve??? Haynes say's to remove the entire manifold to get to the CMCV.
I can see it with a mirror,. I am thinking maybe long needle nose from Harbor freight,...bend the tip short,..maybe be able to change it out?????
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This truck has been running fine then as my son was getting off the interstate it started acting like it was running out of gas then died. I went to tow him in and it cranked right up and never had another problem for a week. Yesterday he drove 80 miles away when the same thing happened shortly after he got off the interstate. He replaced the fuel filter which it probably needed but still won't start and stay running. It cranks right up the immediately dies.
First time this happened it was throwing codes PO171 and PO174. Now it is not showing any DTC's at all and none pending. We see no frayed or bad wires and all vacuum hoses seem fine. He cleaned the MAF with no change in behavior.... If it were an outboard motor or some kind of boat I'd say the problem is in the ignition switch except it does run a very short time before dying. If I immediately try to restart it won't stay running. If I let it sit for a while then it will run for about a half minute.
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2001 F150 4.6. Just replaced all 4 oxygen sensors and spark plugs. Replaced rubber grommet on brake booster as it was leaking vacuum.
Truck is still running rough hesitating.
Pulled codes came up as PO141 oxygen sensor heater circuit. PO171 passenger side cylinders running lean. Fuel trim outside limits.
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I have the notorious PO171 and PO174 codes on my 2003 5.4L that come back whenever I erase them. I cannot figure out the problem. Whenever I start the truck it cranks for 3-4 seconds before it finally fires, then rpm's are very low, then they finally pick up. I have noticed a loss in power as well. I have completed a full tune-up (spark plugs, coils, boots, filters, etc.)
I have checked the vacuum and PCV lines numerous times, I have yet to find a leak. MAF appears clean. I am running a K&N CAI setup. O2 sensors a good, replaced the gas cap. The only other problem I can see is a bad PCV valve? I hope it isn't a manifold gasket. The truck has been very well maintained and still looks brand-new throughout at 250,000 miles.
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2001 vw cabrio 2.0 .. The car starts and stalls BUT only if you give it gas. I replaced the throttle body and did the throttle body alignment using vas-pc , no problems at idle but as soon as i give i gas it dies, and it seems to die quicker at higher temperatures. When it dies i get codes P0121 and P1570 i clear the code , do the alignment , and same thing happens over again. I also replaced distributor , crank sensor, maf sensor , spark plugs, wires , rotor, tried different pcm reprogrammed, no vacuum leaks, the only thing i can think of now is the ecm relay? but its missing so is it using the fuel pump relay ?
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I have a 2003 F250 with the 5.4 and I believe I am having a fuel delivery issue. I took out yesterday and stopped to get a drink at the gas station, came back out and the truck wouldn't start long enough to idle. It would start, barely bounce off zero rpms and die out. I checked the fuel interia switch and it was down. I tried turning the key back and forth thinking it might reset the fuel pump or something and that didnt work. I get the truck towed home and couldn't get it to start last night. I go out this morning and it starts, come home from work and now it won't. This happened about 2 years ago and I never did anything about it, but it took 2 years for it to happen again.
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I had a strange problem tonight, my car wouldn't start in park as it normally does, but did start in neutral? I certainly don't want it NOT to start! is there some sort of sensor that tells the car its in park and therefore allows it to start, which may have slipped/become faulty telling the car its safe to start, even though its in neutral and not park?
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This all started out when I wanted to change my original plugs that had 200k miles on them. I have that part done now and new wires. Then it wouldn't start without me starting it while holding the gas pedal down. Then I would have to press the pedal down or it would die.
I may need to clean the throttle body. I bought some Valvoline Throttle Body Cleaner and cleaned the throttle body it was black inside and now it's nice and clean. After that the car starts up fine except on the first try. It starts up and idles at around 2,000 rpms. When I press the brake it drops to 1,000, then back up to 2,000. The strangest part is I have no acceleration power now. I can press the pedal to the floor and it will only go to 3,000 rpms. It will slowly get faster as I drive but there's no immediate response when I press the pedal down.
Why would cleaning the throttle body do this? It throws a code when I first start it and it dies the P1110 code but I think that is because the rpms are at 600 when it catches it. No misfire codes or anything, so I think the plugs and wires are working. Just the faster than normal idle now and no power when I press the pedal down.
Would the throttle body cleaner hurt the throttle position sensor?
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We just replaced the starter on a 2004 Hyundai Santa fe 3.5. The car now starts, but won't idle. I can keep my foot on the gas and keep it running, but as soon as I let my foot off the gas it dies. We didn't have this problem before replacing the starter. Where to start looking?
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My car has the same issue, its a 2001 santa 2.4 . Its starts and then shut off after 3 seconds. camshaft was replaced twice already. still same issue, die after 3 seconds. everything seems to be fine.
What about fuel pressure at the rails? If the pump runs for a moment when the key is turned to the on position then when cranking it stops. That would let the engine start and run for about three seconds. Could it be the ignition switch?
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CEL has been on for a few months, emissions testing came up so we read the codes (P0401 & p0401p) . We took it to the mechanic we always go to, a local one and they ran a full diagnostic and they said there were no leaks and no build up. Everything checked out fine and all they could suggest was replacing the Solenoid (Don't get me started on that) they said they were baffled (a wee bit worrying). So we did that and 20 minutes later the light was back on . In fact, every time we reset the code it comes on 20 minutes later.
The car is due back for Emissions in a month since it failed.
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I have a 2006 Santa Fe with the 3.5l, AWD, 5 speed auto, and 65,000 miles. Its a daily drive. Out of the blue it won't start. It cranks, but it won't start. The battery is strong and it has 1/2 tank of gas. I figured my code reader would solve the mystery, but it's doesn't produce any error codes. With no codes I don't even know where to begin.
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My beloved Hyundai Santa Fe,2006 model's engine light came up. The engine starts and than about 10 seconds after cuts out straight away. What to do. I have always taken care of this car and being serviced well.
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