I have a smoke tester now, The question is, where is a good place to hook it up? I have seen a video where the guy hooked it on the brake booster vacuum line, but this van a 2011 Chevrolet Express G3506 has no vacuum-assisted brake booster. What a pain it was to get the engine cover off had to pull ...

Thanks, MoutainMan Joe you know your stuff More to the story, I hadn't driven the van, which happens to be an RV, for 5 months, and the battery was dead and unrecoverable. I replaced it and drove the RV for about 30 miles with no check engine light. Then when I took it in for smog, the guy said you'...

Thanks for the input MountainManJoe

2011 Chevrolet Express G3506.0L V8 SFI OHV 16V. 32,755 miles If I don't see a leak, I think it's possible a faulty purge valve from what I have read

I had no check engine light until he hooked up his computer my question is could he have done something to screw things up with a (scan tool with bidirectional controls) I might take it to another place maybe the Chevy dealer to check the ECM. In an article, I read the guy used his scan tool with bi...

I took my RV in for a smog test and the guy hooked up what appeared to be a(scan tool with bidirectional controls), and lo and behold, I have a check engine light I didn't have before. Is it possible for someone to use a bidirectional scan tool to for example, set your purge valve open or change oth...