Di­ag­nos­tics Doc­tor

Car Mechanics (UK) - - Contents -

Q

My wife drives a 2005 Kia Pi­canto 1.1 with the Ep­silon en­gine that has started to mis­fire and jud­der. Off the top of my head, I di­ag­nosed a faulty ig­ni­tion coil pack and used a Foxwell de­vice to read the fault codes, which showed ‘P0336 – Crankshaft sen­sor A cir­cuit out of ref­er­ence’. I paid £48 for a new sen­sor and had loads of fun re­mov­ing all the drive­belts, pul­leys, etc, to ac­cess the sen­sor, which was un­der the lower crankshaft cover! I dis­cov­ered the crankshaft pul­ley bolt was loose and had caused the ‘chop­per’ plate to wob­ble slowly, rub­bing off the top of the sen­sor un­til it could no longer func­tion.

The Pi­canto had a new cam­belt fit­ted shortly be­fore we pur­chased it and the garage had fit­ted the bolt to­tally dry. It had fine rust all over the threads. On re­assem­bly, I used thread lock on the threads and gave the car a ser­vice. It now runs as smooth as silk. My Suzuki Alto has the sen­sor mounted ex­ter­nally and uses an axial ‘chop­per’, but seems to have come from a sim­i­lar de­sign shop. The Dae­woo Ma­tiz en­gine also has many sim­i­lar­i­ties. Tony Ni­chol­son

A

This is quite a com­mon de­sign across many en­gines and, as you have proved, the se­cur­ing and tight­en­ing of key com­po­nent bolts is cru­cial when car­ry­ing out work such as a tim­ing belt re­place­ment. This in­for­ma­tion will hope­fully help other read­ers fac­ing a sim­i­lar prob­lem.

Tony Ni­chol­son’s photo of the sen­sor.

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