Question about 2005 Ford Futura

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Hunting at idle-worse cold,slight missfire at top end,done the leads,tightened manifold,checked fuel pressure,volume & injectors-no codes when scanned -checked coils,plugs etc-appears to be running lean on analyzer

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Sounds suspiciously like it could be the Idle Speed Control (ISC) motor on the side of the throttle body. They can tend to carbon up and become sticky. Try removing it and cleaning it out with throttle body/carb cleaner. This motor controls additional air into the inlet system. If it is sticky is does not react smoothly and in time with the request from the ecu, it will cause hunting. It may also be a good idea to check the oxygen sensor while your at it, although surprisingly, in all the info I've got I cannot find resistance figures for it.

Posted on Aug 22, 2009

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Posted on Jan 02, 2017

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1 Answer

What are the probable causes of DTCs P0300 and P0316?


code p 2274 refers to heated oxygen sensor(HO2S) 3 bank 1 signal stuck lean or oxygen sensor(O2S) signal stuck lean===causes for both--wiring ---HO2S--fuel pressure --injectors --intake leak
code p 0300 refers to random /multiple misfires detected ===causes --spark plugs -- HT leads injector/s--ignition coils --low compression --wiring
code p 0316 refers to misfire detected during start up---first 1000 revolutions ===causes --engine mechanical fault---wiring---ignition / fuel system---injector
in all codes the injectors show up as a problem cause and if you couple that with low fuel pressure issues you may have a pointer to the real cause
have a pressure test done on the fuel manifold top check for pump fault , filter blockage and faulty pressure regulator
check /clean injector tips as they could be suffering from contamination problems and not operating freely ( good fuel injector cleaner)

Oct 11, 2015 | Cars & Trucks

1 Answer

What is code p0101/p0300/p0171


code p0101 refers to MAF sensor and VAF sensor--range /performance problems===causes --intake leakage/blockage ---MAF/VAF sensor failure.

code p0300 refers to random misfires multiple cylinders ---causes --spark plugs /HT leads --injector /s-- ignition coil/ s--low compression ---wiring

check fuel pressure in manifold and HT leads

code p0171 refers to system too lean bank 1 ===causes --intake /exhaust air leak---AIR system---MAF/VAF sensors ---fuel pressure /pump---injectors ---HO2S sensor

Basically there are two codes referring to the MAF/VAF sensors so check them out and two codes referring to fuel pressure and pump so have a pressure test done on the fuel manifold to determine if pump or pressure regulator.

Aug 24, 2014 | Cars & Trucks

1 Answer

97 mpv cold start fuel injector location


If it is a diesel then the cold start injector will be in the manifold . There will be a pipe connected to it and a wire as the injector normally squirts on a hot element which creates a fire that is drawn into the combustion chambers.. Check that the element is operational. If petrol then run the fault codes to find out the problem. I would be having a pressure test done on the fuel manifold to check the pressure regulator and pump operation

Feb 20, 2014 | Cars & Trucks

1 Answer

My 2000 f150 throughts a code . missfire cyl 1&6 but ive replaced every thing i can think of. would a exagost leek cause it to missfire? or a cloged cat


misfires can come from faulty injectors, low fuel pressure in the manifold. timing , blocked exhaust. faulty o2 sensor, leaking inlet manifold gaskets, faulty valves (burnt) It is not always plugs and leads. Have a fault code reading done.

Apr 01, 2013 | Ford F-150 Cars & Trucks

1 Answer

My check engine light is on


possible the fuel regulator valve at the end of the fuel manifold is not holding sufficient pressure. have a pressure check done to eliminate that problem check that one of the codes is not for faulty injectors

Jan 23, 2013 | 2005 Mazda 3

1 Answer

2002 accent p0171 lean mix and cyl 1 and 3 missfire cant find any vacum leaks any ideas was going to try frount 02 sensor


bad oxygen will idle speed also clogged fuel filter,faulty fuel pressure regulator, dirty fuel injectors will cause engine to rough idle.

Dec 06, 2011 | Cars & Trucks

1 Answer

Car sucks at idle and wont go over 40mph. has a p0300 code


Hi, have you done a fuel pressure test ,a bad fuel pump or stopped up fuel filter can cause a missfire code. your p0300 is a random missfire code. If you dont have enough fuel pressure to the injectors it will missfire because of not enough fuel . I dont now what your fuel pressure should be because i dont know what engine you have. If have any more question please re post.
Thanks dodge tec

Jan 04, 2011 | Chevrolet Malibu Cars & Trucks

2 Answers

Rough idle under 1000 rpm


There are a lot of causes for this problem. Common ones are: Low fuel pressure, dirty injectors, valve seating issues, leaky ignition wires, or a sensor that is fooling the computer to either lean the engine out or make the mixture too rich. . If it is a high mileage car, have the tuneup done, and then check the fuel pressure. If low, check the filter, then change the pump if filter change doesn't do it. . If that doesn't do it, do a top-end cleaning (or have it done) to clean the throttle body, injectors, and valves. . If the problem started suddenly, look for pump pressure problems, then ignition. Run the engine codes for bad sensors. . If the problem slowly got worse over a few months, do a top-end cleaning.

Nov 25, 2009 | 2004 Buick LeSabre

1 Answer

Injectors for 1989 honda accord removing and installing


Detach the cable from the negative battery terminal (if you have an anti-theft radio, make sure you have the code to reactivate it.).
Relieve the fuel pressure (take the gas cap off, and loosen service bolt at the top of the fuel filter; you will need two wrenches for that, on to hold the fitting and the other to loosen the nut; make sure you have a towel or something to catch the gas spill). You could, instead, just SLOWLY loosen the pressure line at the right end of the fuel rail (facing the car).
Remove the air cleaner assembly (take the top off, take out the filter, detach all hoses, take out retaining bolts, and remove).
Unplug the injector connectors (CAREFULLY detach the clips first; just pry them back out of their notches; try not to pop them off and drop one, they are hard to find once dropped).
Detach the vacuum hose and fuel return hose from the fuel pressure regulator (left end of the fuel rail, if you are facing the vehicle)
Detach the two ground cables from the intake manifold (in the middle, under one nut)
Detach the fuel lines (already did left one; detach the pressure line at the right end of the fuel rail).
Remove the mounting nuts (four) and detach the fuel rail and injectors from the intake manifold.
Remove the injectors from the fuel rail and remove and discard the seal rings (top and bottom; the second ring down on the top is the cushion ring and does not need to be replaced, but it is recommended. Most kits contain them)
Coat the new o-rings with fresh oil and slip them on the injectors (or, if you are replacing the injectors they probably came with o-rings on them. Just coat them with oil)
Place each injector into its corresponding bore in the fuel rail (doesn’t matter which is which if you are replacing them all).
Coat each new bottom seal with oil and press it into the injector bores in the intake manifold.
Install the injector and fuel rail assembly on the intake manifold. Make sure the centerline of the electrical connector on each injector is aligned with its corresponding mark on the intake manifold (little arrows, I think). Tighten the fuel rail nuts to the specified torque (17 lbs)
Reverse removal procedure for the rest.
After all is done, turn the ignition on, but do not start the car. This will build up pressure in your fuel lines. Do that two or three times, then check to see if you have any leakage around the injector, or other fittings, before you start the car.
Then you’re done.
Hope this gets you through it.

Nov 08, 2009 | 1989 Honda Accord 4 Door

2 Answers

98 camry engine light on w/misfires & system too lean


take sample of your fuel into clear plastic bottle from fuel line
is there any water present?
this can cause these codes and then not go on storing codes for other bank even though that bank will be missfiring also due to water & P0300 Random/Multiple Cylinder Misfire Detected being logged
check all connections to coils/leads & wiring connectors
due to miss fire codes for cyl 1,3,5 all on the same bank
also look and check for air leaks on that bank (hose knocked off or splithose)inlet manifold gasket,brake booster etc...
3 injectors being blocked slightly on same bank posible!!!
check wires and signal

was it running like this b4 tune up & repairs?
this is what codes are
P0170 Fuel Trim Malfunction (Bank 1)
P0300 Random/Multiple Cylinder Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0303 Cylinder 3 Misfire Detected
P0305 Cylinder 5 Misfire Detected

the last code is for trans due to misfire/running lean on bank 1 probably a torque problem code
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May 29, 2009 | 1998 Toyota Camry

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