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Hi, I recently purchased an K9 LTR that is not running, I swap mostly everything except the ECM because the other LTR is a K8 that don't have the same ECM ( not compatible ). Pump, Injector, Tank, regulator, filter. I test most of the sensors, adjust the TPS. The compression is good, leak down test 95%.

What can cause an intermittent injector spray trigger ?

See the video :

 

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Could be a sensor the tell the injector when to fire might be reading wrong.
 

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My injector was doing the intermittent thing and then I checked the crank position sensor and the bolts had came loose that holds it right beside the stator. But now it will run being bump started but not with the starter. All the valve clearances are good.
 
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