Flat Work Posted July 25, 2018 Share Posted July 25, 2018 This spring, when I got the truck out, I had no alternator charge, and the CEL lightening bolt was on. I replaced the alternator, and batteries, and fixed the problem. The truck charges at almost 15 volts now. But I still have a check engine light issue. But only while the truck is at idle to about 1000 rpm. As soon as the engine speed comes up above that, it goes out, and stays out. Until I come to a stop sign, red light, or just idle the truck. It's running fine. Starts fine, accelerates fine, and has its usual power. My DOT inspection is due next week. Is there any way for me to pull this code and determine the problem before hand? Truck is an '04 CX-613. AC-427 engine. 344,000 miles. Quote Link to comment https://www.bigmacktrucks.com/topic/53898-intermittent-check-engine-light/ Share on other sites More sharing options...
Mackpro Posted July 26, 2018 Share Posted July 26, 2018 With fault code active , turn cruise control switch off. Push and hold the Acel/Decel switch (either top or bottom) for about 3-5 seconds then release, the yellow lightning bolt will flash out a 2 digit code Quote Link to comment https://www.bigmacktrucks.com/topic/53898-intermittent-check-engine-light/#findComment-403059 Share on other sites More sharing options...
Flat Work Posted July 26, 2018 Author Share Posted July 26, 2018 5 hours ago, Mackpro said: With fault code active , turn cruise control switch off. Push and hold the Acel/Decel switch (either top or bottom) for about 3-5 seconds then release, the yellow lightning bolt will flash out a 2 digit code And I can do this with the engine running? Quote Link to comment https://www.bigmacktrucks.com/topic/53898-intermittent-check-engine-light/#findComment-403065 Share on other sites More sharing options...
fjh Posted July 26, 2018 Share Posted July 26, 2018 I beleive shut the engine down turn the the key back on soon as the engine stops running! Quote Link to comment https://www.bigmacktrucks.com/topic/53898-intermittent-check-engine-light/#findComment-403084 Share on other sites More sharing options...
Mackpro Posted July 26, 2018 Share Posted July 26, 2018 I have done it with the engine running, I believe the parking brake has to be set or no road speed detected. Quote Link to comment https://www.bigmacktrucks.com/topic/53898-intermittent-check-engine-light/#findComment-403097 Share on other sites More sharing options...
Flat Work Posted July 27, 2018 Author Share Posted July 27, 2018 (edited) Okay, it's blinking 4-5. Which my research pulls up a problem with the VGT. When I bought the truck a year and a half ago, the VGT was stuck. I worked it loose with a small pry bar and penetrating oil, and it stopped throwing a fault. Will this cause me to fail my inspection? Edited July 27, 2018 by Flat Work Quote Link to comment https://www.bigmacktrucks.com/topic/53898-intermittent-check-engine-light/#findComment-403107 Share on other sites More sharing options...
Mackpro Posted July 27, 2018 Share Posted July 27, 2018 At our shop , on our DOT inspection forms , there is no mention of checking for fault codes. However , a state inspection or one done by a actual DOT officer may be different. I have heard of active ABS fault codes causing some trucks to fail some DOT inspections at weigh stations. Quote Link to comment https://www.bigmacktrucks.com/topic/53898-intermittent-check-engine-light/#findComment-403125 Share on other sites More sharing options...
fjh Posted August 6, 2018 Share Posted August 6, 2018 From My observation the DOT make their own rules! They also have a spin the wheel Game they use when they start the week! last week it was licence plate lights this week its mud flaps have to be 8 inches from the ground important shit like that!😖 2 Quote Link to comment https://www.bigmacktrucks.com/topic/53898-intermittent-check-engine-light/#findComment-403699 Share on other sites More sharing options...
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