Alright guys, got a weird one for you and I am looking at where I should start. Any help would be greatly appreciated. I got an 05 vortech supercharged rev up g35 tuned up uprev.

Now when I get on it and boost on the highway it feels fine. But once I lay off the gas and just cruise down the road the car has a noticeable vibration almost feels like it has a random misfire but not nearly as harsh. The vibration goes on for 5 or so min of normal driving and then it is completely fine and driving smooth like usual.

I have been able to replicate the issue every time after I get on it. This started happening about 3 days ago. Not sure if related and I will need to try again but I tried to change the tuning map driving home while it was vibrating and it wouldn't acknowledge me doing the button sequence but the cruise control works fine.

Any help on what I should look for or anything would be great. Thanks guys.

 

Needs more info. What other mods, what gauges do you have and what are they reading (mainly afr in boost and at cruise while having issue, and at cruise without issue) I'm thinking it's something there.

 

Update... I can change the uprev maps now idk if i just wasn't doing it right or what so that seems unrelated.

 

I have a boost, oil pressure and wideband gauge. Everything looks fine and tuned by an uprev tuner but it only acts up after I boost but then it goes back to normal after a couple minutes. No lights or warnings come on.

 

Well I'm retarded, I thought the motor or tranny was the issue but I was wrong. I did some testing over the weekend and found out it seems to be a delayed releasing brake or similar.

The vibration occurs even with the car in neutral, car still pulls fine when vibration is happening, noticed the car being held back when leaving a parking space when using no gas and releasing the clutch.

So now my new task is to figure out what brake it is and what is causing it.

 

sticking caliper then?

 

Yea looks like it...should I just get a new caliper or can I fix mine you think? It doesn't seem completely frozen cuz if I don't use the brakes one the highway it free up and there is not any noise or skreetching.