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Showing results for tags 'Mechanic has no idea'.
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Hi guys, I'm pretty sure my BA XR6T has an overboost problem, or at least this is what the mechanic is telling me. They've had it for 3 days and can't determine what is causing it. I don't know too much about turbos so I'll try and explain as best I can and hopefully someone here might be able to help. The car drives fine when driven normally, however there is a shuddering and slight backfire at 2500-3000rpm. The mechanic has tested the car with gauges and there's nothing wrong with the fuel pressure however there is 20psi of boost when this shuddering happens. The computer errors he gets is consistent with a wastegate problem but he says that it's working. He can see the "pin moving" on the side of the wastegate, although he says to really see if it's working he needs to take the turbo out. He doesn't think the wastegate is the problem. All the plugs, coils and cables are fine. They thought they fixed it the other day but they had blown a hose off the turbo. He's been talking about putting hoses in with loops to control the boost going to the turbo but this sounds like a patch up job. The only thing they can think of is something electrical. I explained the problem to a friend and he said it might be the ECU. The car had a hole in the inlet manifold gasket recently as well, and it was after I got that fixed that I really started to notice this overboost problem. Is the mechanic over his head because I start to get worried when mechanics don't know what the problem is. They tend to start replacing everything they can hoping that'll make a difference. Any help would be appreciated. Thanks, James. PS: who would be best to take the car to if the mechanic can't do the job?
