Prime8

I seem to be having an issue that I cant seem to solve. I have talked to several people and they have given me some good ideas but none of them have solved the problem.

I have an 04 GTO with a heavily modified cast iron 6L and i am running a D1SC pro charger with methanol injection. The issue that I am having when I get into boost after I let off of the gas pedal to change gears the pedal becomes unresponsive. It gets stiff and I have to pump it a few times to get it to work again.

I have checked the cable and didn't see anything wrong with it. I also checked my surge valve and it working as it should. I also checked the bracket behind the gas pedal. Nothing there. I checked the throttle body as well and its not sticking and opens freely. Now this only happens when I am in boost. I can drive around all day and not have a single issue. I am out of ideas and I am new to my area and haven't found anyone close to take a look at it. So any ideas would greatly be appreciated. thanks.

blue00ZZleeper

iTrader: (5)

The second you let off do you hear the bypass release the air? It sounds like the bypass is working at idle yet not releasing the boost pressure after a pull.

Prime8

I talked to procharger about that. They told me to take the valve off place my finger over the vacuum and open the valve if it stayed until I moved my finger then it was operating properly.

Prime8

I don't think I am hearing it but my car is loud and it didn't help that my exhaust is ring next go the door. But I did that heck and it operating normally. I had another guy tell me the same thing about not realeaseing boost. But I did that check that procharger said and from what hey say it's working.

Johnv

I've seen this on a couple of blown cars, from memory the problem has to do with the boost holding the Throttle blade open.

The fix on the cars in question was to flip the throttle blade so the idle air hole was at the top ? i think.

LASTLS1

iTrader: (7)

On my car I give the return spring a extra wrap for added tension. Most likely the cause of his problem.

Bob@BruteSpeed

iTrader: (16)

That should do the job. To the op, you don't happen to have an older FAST 90mm throttle body on your car, do you? Bob

Prime8

No it's a 92mm and it's about a year old. One guy suggested it might be my methanol that's keeping the throttle body sticking closed.

427

iTrader: (3)

Where is the vac line on the blow off hooked up?

Kurt

Prime8

it is coming off of the fuel pressure regulator.

98Camarod

iTrader: (43)

Maybe it's just me, but I think you would want a dedicated line for each of those equally important parts.