Brad Clayton Posted February 21, 2014 Share Posted February 21, 2014 I know this has been covered before but a rehash never hurts. 2006 F-250 with a prominent surge. I came back from the test drive and knew it was turbo related as most 60 surges are. I took command of the VGT solenoid and had to command it past 50% to get the MGP pid to start registering some PSI. Next it was on to a VVT turbo test with the VMM. Here is the result: From this shot we can see some serious over shoot on the stair steps. This is usually an indication of a fubar'd solenoid. I just happen to have a known good tester and swapped it in and retested: Much better graph, and a test drive confirmed the surge was gone. 1 Quote Link to comment Share on other sites More sharing options...
Matt Saunoras Posted February 21, 2014 Share Posted February 21, 2014 First solenoid I ever saw do that I wound up letting the customer go because he was a waiter and I could not for the life of me figure it out. I ended up reading a post on here about it and called the guy the next day to tell him what would fix it......and it did. Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted February 21, 2014 Author Share Posted February 21, 2014 Quote Link to comment Share on other sites More sharing options...
Aaron Posted February 21, 2014 Share Posted February 21, 2014 First solenoid I ever saw do that I wound up letting the customer go because he was a waiter and I could not for the life of me figure it out. I ended up reading a post on here about it and called the guy the next day to tell him what would fix it......and it did."Hi, I have a driveability concern on my 6.0? Yes, I would also like to wait for it. Tomorrow im going to bring my 5.4 3v in for plugs and exhaust manifolds, and I would also like to wait for that." Quote Link to comment Share on other sites More sharing options...
Aaron Posted February 21, 2014 Share Posted February 21, 2014 (Convo between advisor and customer, lol) Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted February 21, 2014 Author Share Posted February 21, 2014 Quote Link to comment Share on other sites More sharing options...
Matt Saunoras Posted February 21, 2014 Share Posted February 21, 2014 Hahaha. I once did a waiter heater core in a Taurus Quote Link to comment Share on other sites More sharing options...
Aaron Posted February 21, 2014 Share Posted February 21, 2014 Lol I have too, believe it or not. Quote Link to comment Share on other sites More sharing options...
batmantech Posted February 21, 2014 Share Posted February 21, 2014 Had a retired guy wait for his alignment, he found a chair and then promptly fell asleep. Quote Link to comment Share on other sites More sharing options...
Mekanik Posted February 22, 2014 Share Posted February 22, 2014 I've never run into this, but it's really good to know. 6.0L drivability as a waiter... That kind of stuff pissed me off, but we make people like that wait. I'm not going to skip my lunch because of someone else's poor planning. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted February 22, 2014 Share Posted February 22, 2014 I think I have only come across one or two VGT solenoids that were bad over the years. I too somehow obtained a "known good one" so ruling it out when diagnosing is fairly easy. That overshooting on the graph is similar to a sticking turbo. Quote Link to comment Share on other sites More sharing options...
Aaron Posted February 22, 2014 Share Posted February 22, 2014 I've only changed one for being bad. It wasn't working at all, that was a very long time ago too. Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted February 22, 2014 Author Share Posted February 22, 2014 Back in the day we were replacing turbos left and right. All turbos came with a VGT solenoid. A couple of cores went back minus the solenoids. Quote Link to comment Share on other sites More sharing options...
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