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Motor is miss firing p3o3 changer ecu after few mins mis fires is my crank position sensor not reading the third cylinder for some reason i did a motor swap ran new motor 3 or 4 hours had miss shift problem occured not sure compression is 200 across board got fire and inector pulse even tried old ecu srarted to miss after a few minutes rrrrrrrrr not sure but seems like timing is off in that cylinder

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Your crank position sensor does not read individual cylinders, only the position of the crank shaft. make sure the plugs and wires are good, check the spark coming from the coil, make sure there are no vacuum leaks at intake manifold, check timing, then do a leak down test to make sure you don't have a bent or damaged valve in the cylinder head.

Posted on Mar 31, 2011

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My 2008 Ford Bantam seems to have strange firing order 1-2-4-3? is this correct. Also the distributor does not have an H.T. lead. Can someone help please?


4 cylinder engines can have both firing orders
the more common one is 1-3-4-2 but some manufacturers have the other firing order
it depends on the manufacture of the position of the crank pin
some reason for it are
less harmonic vibrations
less stress on crank webs
easier manufacturer
for the missing problem run the fault codes and check for ambient temp sensor , maf/vaf sensor or BARO sensor problem

Dec 31, 2015 | 2008 Ford Bantam 1.3i

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CKP - Crankshaft position sensor


<p><b><span>3.1) <span> </span><u>CKP - Crank shaft Position </u>(sensor)<u></u></span></b><br /> <p><b><u><span><span> </span></span></u></b><br /> <p><b><span>What is it?</span></b><span> This is an electrical device that monitors the position of the crank rotation.<span> </span>The output from the CKP allows the ECU to determine the ignition timing, injection timing (in the absence of a cam sensor) and engine speed (revolutions).<span> </span>Generally if an engine has both crank and cam sensors it is the crank sensor that takes care of ignition timing and the cam sensor takes care of injection timing.</span><br /> <p><span> </span><br /> <p><b><span>Where is it located?</span></b><span> Most usually the crank sensor is located on the 'back' of the engine on the edge of the flywheel housing above the starter motor mounting or on the underside of the engine block;<span> </span>although in this position it is much more prone to stone damage, corrosion and dirt.<span> </span>On some engines the crank sensor is to be found on the front of the engine taking its measurements from the crank pulley. <span> </span>In this front position the crank sensor is often more exposed to the effects of dirt, water splash, oil leaks and heat as well as being more awkward to physically access. </span><br /> <p><span> </span><br /> <p><b><span>How does it work?</span></b><span> The device can employ several forms of detector.<span> </span>Some are passive, needing no electrical supply and include; inductive-magnetic (sine wave output), and reed type. These are typified by having just two wires connected to them.<span> </span>Some are active, needing a power source in order to operate and include: magneto-resistance (square wave); Hall-effect (square wave); and optical type. These are typified by having three (or more) wires connected to them.<span> </span></span><br /> <p><span>The magnetic sensor is popular due to its simplicity and reliability, the Hall-effect type is also popular as it also reliable and its design allows for self diagnostic testing.<span> </span>The role of the CKP device is to detect the presence of magnet(s) or marker teeth on the periphery of the reluctor ring on the crank and to send pulse(s) back to ECU.<span> </span>The ECU reads these pulses and electronically triggers a spark at the appropriate point, advancing and retarding the ignition according to the speed of pulses being received.<span> </span>In older engines, perhaps where the cam sensor is absent, the ECU will initiate a spark every time TDC (top dead centre) is detected and each cylinder receives a spark <b>every</b> crank revolution even though ignition is only required on alternate rotations. <span> </span><span> </span></span><br /> <p><span> </span><br /> <p><b><u><span>Symptoms of faulty crank position sensor</span></u></b><br /> <p><b><span>Associated OBD2 error codes DTCs: <span> </span>P0335 - P0339; P1345</span></b><br /> <p><b><u><span><span> </span></span></u></b><br /> <ul> <li><b><span>Starting difficulty/failure/stall - </span></b><span>If the faulty CKP timing problems are severe they may prevent the engine to fire, to fire and then stall, or stall at some random time without warning.<b></b></span></li> <li><b><span>Hot engine shut off and failure to restart - </span></b><span>The engine may start and run perfectly from cold but will begin to misfire or suddenly shut off after about 15 minutes once the engine has reached operating temperature.<span> </span>This effect is due to thermal expansion of the CKP body causing an intermittent break in electrical continuity and therefore the signal output to the ECU is interrupted.<span> </span>Sometimes the engine will restart but fail again after a further 15 minutes.<span> </span>On other occasions the engine will not restart until it has completely cooled down.<b></b></span></li> </ul> <ul> <li><b><span>Misfire - </span></b><span>miss-timed spark delivery caused by a faulty CKP signal can cause misfire and back fire events. <b></b></span></li> <li><b><span>Hesitant acceleration, acceleration ceiling - </span></b><span>Miss-timed ignition due to a faulty CKP signal can be exacerbated by increased engine speed. The engine maybe run evenly at idle but will fail to accelerate properly at higher revs until the engine reaches a power ceiling.<b></b></span></li> </ul> <p><span><b> NEXT 3.1b) How to check and fix crankshaft position sensors</b></span><br /> <p><span><b><br /></b></span><br />

on Jul 22, 2011 | Mercedes-Benz E-Class Cars & Trucks

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2006 jeep liberty once I hit second gear it vibrates


multiple code issue (evaporative, catalyst efficiency, and miss fire)doubtfull all 1 source of error but draw attention to the miss fire code PO300 is a random cylinder miss fire, possible crank position or cam position sensors.but i would check timing first.

Mar 25, 2013 | 2006 Jeep Liberty

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Service engine light came on took in for computer read at auto zone got a mis fire in cylynder one said crank sensor replaced crank sensor put new plugs and new wires new oil filter andoil cleaned mass air...


Cylinder 1 is not firing or is intermittently firing. Check the output on the coil associated with #1 cylinder by using a spare plug attached to #1 wire while engine is running. If it has good spark, check the fuel injector for possible problems. Crank shaft sensor would not be the problem as the engine has to have it to run. You may need to have it checked further at a reputable repair shop as this can get more involved than a back yard repair.

Mar 15, 2011 | 2004 Ford Taurus

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I have a '03 Toyota Celica GT-S with a annoying mis-fire. Started small by replacing all spark plugs - nothing. Replaced the MAF sensor - nothing. Took it to a authorized toyota shop & checked...


Replaced the MAF sensor - nothing. Took it to a authorized toyota shop & checked compression which check out good and put the computer on. Computer read mis-fire on cylinder 1, and then multiple misfire (like it would jump around). We went ahead and replaced the fuel injector on cylnder 1 - did not solve problem as when we hook the computer up, misfire seemed tp stay at idle and seem better when running high RMP, but check engine light is on as it never went away. Went ahead and replaced the coil pack to cylinder 1 - nothing. what am i missing?

Feb 06, 2011 | 2003 Toyota Celica

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At idle the engine misses, off idle very smooth and runs normally computer code multi cylinder misfire. have changed plugs and wires did not help. could it be the coil packs of a fuel problem?


This sounds as if you have a vacuum leak, check all the lines and check the intake. There are a lot of things that will cause mis fire. mis fire code is triggered when the ecm reads a very slight difference in the time the crank sensor picks up a signal. Mis fires can be from electrical, vacuum, mechanical, and eletronic sources. If you can get it to a person/shop that read which cylinder are misfiring this helps alot, narrows the field. Let me know I can help. Also it helps to know what engine we are dealing with

Nov 11, 2010 | 1998 Oldsmobile Aurora

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The reason I'm checking the timing belt is that there is mis-fire in 1 & 2 cylinder. If the firing order is 1,2,3,4. I have continues fire out of 1 & 2, when plug wires are pulled out of head. 3...


unplug the fuel injectors, check the olhms on all. the readings should all be the same, around 11-11.5 olhms. Any readings that are higher is a sign of a bad injector which is what your problems sounds like., putting to much fuel to a cylinder causing different fuel amounts to each cylinder and causing it to backfire out of the throttle body , excess fuel . Also remove the throttle body and clean with cleaner and a toothbrush after replacing any injectors. Or there's a simpler answer and that the cambshaft is worn-out/round causing the lifters not to open enough to let in all the fuel. A worn belt would not cause misfires only on select cylinders but rather jump timing, slipping a notch on a gear and possibly bending a valve or valves and this cause a loud clacking or a really a sign to quit running the motor because it's broke! Good luck.

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2 Answers

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ck if you have spark at the coil for that cylinder. check the plug wire closely. if it has spark at the coil, then replace all the spark plug wires.

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1 Answer

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My car is stalling to start. If I just hold the key, it will eventually catch and go ahead and crank. I've changed the crank sensor. Fuel pump is good. Any other ideas?

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