Customer told me my injector timing was off, turns out he was right

Had a guy with a 2015 Cummins 6.7 come in last month complaining about rough idle. I did my usual scan and said it was a sensor issue (you know, typical diag). He pushed back and specifically said the injector timing felt wrong and asked me to check the cam/crank correlation. I was annoyed at first but humored him. Sure enough, the timing was off by 3 degrees from a stretched chain. Fixed it and now I actually listen when customers describe what they feel driving. Has anyone else had a customer call out something specific that you brushed off?

2 comments

2 Comments

marymorgan25d ago

Took me a while to learn this lesson myself. Had a lady with a Chevy 1500 tell me it was a bad ground wire and I basically shrugged it off for two days of chasing electrical gremlins. She was dead on, turned out to be the engine block ground strap. Now I always at least check what the customer is saying, even if it sounds weird. Its amazing how much people pick up from just driving their trucks every day.

the_miles25d ago

Used to roll my eyes at customer theories, but that story changed my whole approach.