Major bucking issue

[boosted92laser]

First off, I did search and tried most of what was said.
I have a major bucking issue. It only happens when the car is warm. Whenever the engine is running over 3000 rpms it bucks like it stops getting fuel. I rewired the fuel pump with 8 gauge and even disconnected my wastegate actuator, and wired it open, so it runs minimum boost. It gets worse with more boost. Anything more than about 10% throttle and it bucks. It will continue to do it till the car cools off.
If anybody has any input, that would be great.

 

[EvolvingGST]

Well I would first see if you have any IC hoses disconnected blown off. But it might just be fuel cutting. Did you tune it? Because too much fuel not enough air also makes it buck as well as too much air not enough fuel.

 

[linksys42]

Do you have a logger? Sounds like fuel cut. Boost leaks? What psi are you running? Start with the simple things first, check the plugs, wires, boost leak test then go from there.

 

[boosted92laser]

I did a boost leak test and it held 20 psi. The plugs and wires are only about 100 miles old. I will pull the plugs out tomorrow and check them. I don't have a logger or any other tuning device. My boost never sees more than 5psi since i wired the wastegate open.

I thought it might be fuel cut too, so I rewired the fuel pump, wired my wastegate open, and even threw a new MAS on it. It all helped a little bit, but not very much.

I don't have the money right now for a logger. I am trying to get the car fixed for as cheap as possible.

 

[gixrman]

I don't have the money right now for a logger. I am trying to get the car fixed for as cheap as possible.

Cutting corners on tunning a turbo car is not going to work. These cars are very picky about AF ratios. Without a logger you have no clue whats going on. You could be rich, lean whatever. Everytime I had an issue like this it was caused by improper gap on the plugs, bad wires, bad plugs, boost leaks, A/F was out of wack, base FP was off. Without knowing what your AF ratio is your pissing in the wind.

 

[rare1]

I know you said you replaced your plug wires,but I had the same problem.Try running the car at night and spray water on your plug wires with a spray bottle,if you see arching from the wires to the valve cover there's your problem!

 

[blackrosenova40]

Did you resolve this problem. I am having the same problem and im gonna try to replace my fuel filter tommorow. I get bucking under low-mid throttle, above 3000 rpm, and my wieband reads really lean, around 18-21 to 1 afr. Anything at Wot is fine and no knock.

 

[boosted92laser]

I sold the car before I got a chance to get it fixed. Last time I knew, the new owner switched the fuel pump and the computer and it fixed the problem.