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Old 01-23-2014, 07:33 PM
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Question grey smoke, knocking

hi

today after starting the truck it started knocking badly with huge clouds of grey/black smoke.

i ran a contribution test and #3 and #5 showed as failures.

This is a replacement used engine. These injectors were transferred over from the orig engine after being re-ringed. The injectors were new remanned last May and provided good service in the removed engine and did ok for several 100 miles in this engine.


could this be two injector tips breaking at same time or o-ring/installation problems coincidentally occurring in these two injectors?
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Old 01-23-2014, 08:02 PM
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Sometimes when one will fail it will throw off another cylinder. If your scanner has injector disable capabilities see if you can kill each injector to see which one makes a difference. If not you can pull valve covers off and unplug them manually. Good luck


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Old 01-23-2014, 08:08 PM
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hi

i have AE. it did run better during some aspects of the c/c test.
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Old 01-23-2014, 08:23 PM
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I just had this problem and what it ended up being was injector hold downs that came loose. Took the injectors out, cleaned them, put new o rings and copper washer on and properly torqued them. Runs like new now.

This is just a suggestion for something to check when you take it apart....if you do.
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Old 01-23-2014, 08:37 PM
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hi

yeah it has to come apart again. i have a spare injector if needed but never had a problem like this before.
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Old 01-23-2014, 11:08 PM
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my money is on your passenger side harness being bad. pull the valve cover and check out the wiring before you start pulling injectors. also check to make sure the armature plates under the solenoids of those two injectors are tight.
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