only at full throttle my 93 SI hatch bogs and jumps back at me. its not the motor cause it did it with my DX motor too. what could it possibly be. its really bad cause sometimes i forget and gun it and i fly front when the car tries to stop. any ideas? i changed the injectors , the fuel filter and the fuel rail it still does it. what else is possible?

mike

 

check the ecu ground wire on top of your thermostat housing.. mine wasn't bolted down so the wire kept moving around when I made hard turns which caused me to bog... hope that helps.

 

Clogged fuel filter?

 

up. ill check the ground. the FF is new,.,

 

check your plugs they could be fouled out from the chamber folooding at full throtle
just my two cents but it won't hurt to check

 

maybe check your spark plugs, my friends did the same things change the plugs and it was fine

 

Change your distributor cap, rotor, and ignition wires if you havent done so in a while. The button in the center of the cap where the coil transfers power to the rotor may be stuck, dirty, worn down, or all of the above. The gear at the base of the distributor is semi-helical. So when you gun your engine it produces jerk which causes axial thrust on the distributor. Basically it pulls your rotor away from the center of the distributor cap, cutting off spark and turning your acceleration into dynamic engine braking, making it feel like your car wants to stop.

 

i think it has to be my fuel pump cause i had a dx motor and it did the same thing and then i put in my SI motor and ecu and it still did it so that eliminates anything to do with the motor or ECU . i has to be something that stayed on the car from swap to swap.. i changed the injectors too . still does it. could it be the fuel pump going bad? anyone got one for sale?