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fish 10

Tdci Issue Cylinder 4 Above Knock Threshold

10 posts in this topic

my mondeo heater plug light keeps flashing,cars feels like its running on three cylinders it is very smokey and sluggish ,i put it on my scanner and code p2339 comes up with cylinder 4 above knock threshold is it a faulty knock sensor or some thing more serious

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9 out of 10 times this will be down to a knackerd injector,get a leek off test done which should comfirm this.

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it could be just injector needs re programming...common fault,

if your scanner can do injector programming be aware that when it says cylinder 4 it probably means the 4th cylinder in the firing order, which i believe, on this engine is actually no2.

if your scanner is capable, can run you through the process, otherwise needs to go to a diesel specialist.

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thanks guys will try to re programe it my self this morning just had f super mk 2 through post this morning ,hope this will do the job fingers crossed

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thanks guys will try to re programe it my self this morning just had f super mk 2 through post this morning ,hope this will do the job fingers crossed

Off the top of my head works ok on post - 2004 Mk3 Mondeos but may be difficult to recode the injectors on earlier engines with the F-super

Some of the early Mk3s are non OBD2 and use a completeley different ECU

You don't say what year your Mondeo is

Is that the cylinder connected to the EGR valve? (phisically 2nd from the left, as viewed from the front)

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its a 53 plate if thats any help can re program the injectors no problem but wont bring the codes up for me confused,it says read injector press ok then nothing press reprograme injector and every thing comes up ba the codes egr to the left atached to the inlet manifold

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If the codes have been cleared no fault codes will come up at least untill the engine/ car is run again, perhaps for a few miles or until the conditions that generate the fault code happen

EGR stands for Exhaust Gas Recirculation, there is a "hole"/ connector on the exhaust manifold, close to the exhaust port of the 2nd cylinder from the left, as seen standing looking back with the bonnet open - i wondered if this was the faulty cylinder, and speculated if this was somehow connected in some way and it was not a coincedance that the faulty cylinder/ injector was the one connected to the EGR

that 2nd cylinder / part of the exhaust manifold, connects to the EGR cooler, it then goes into a metal pipe, which goes around the engine block/ head (on the right-hand side) before connecting to the EGR valve housing on the front (left-hand-side) which connects to the inlet manifold

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the super f will only read codes on mondeos with a buld date after feb 03, but the injector codes should be on a lable on the end of the engine if there the origanal injectors.

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mintalking thanks for your advice you were spot on with the label on the engine all injector codes were there and some one even numberd them to each cylinder will re programe in the morning thanks for your advice and your help one very happy person ,and garage quoted me 100 for new injector 25 pound to programe it and theyll fit it free think they felt sorry for me paid 2500 for it one owner full service history but been playing up since ive had it many thanks

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