legacycentral bbs

I have a 91ss 4eat that has hesitation or missing above 3k rpm. I've changed plugs, swapped the wires with another set, did the fuel filter, knock sensor and every other maintenance thing I could think of and it's still there, I dont have any cels by the way. Can anyone help me diagnose this?

Coil pack? Vacuum line knocked off?

Sounds like my car when the T-belt was off one tooth

I did swap the coil pack and I already checked the timing belt. I'm stumped.

bump changed the maf and the boost solenoid and still no change.

are you loosing oil? if you are then i would say turbo, only because the same thing was happening to me, and it ended up being the turbo after i replaced the plugs, wire, coil, fuel filter, fuel pump, injectors, maf, map, exhaust, etc.

Did you try resetting the timing belt like shtbxr22 suggested?

I did check and double check the timing belt, I'm not losing oil but I may swap out the turbo anyway, the car does have an exhaust leak but I'm pretty sure it's the donut gasket.

check connections on fuel pump and make sure the ground is good.

Is the hesitation just in a specific RPM range (3K - 4K) or is it a hesitation anywhere about 3K? Highe RPM hesitations generally indicate a bad ground. Motor grounding is next to the driver side valve cover. One ground for the entire engine harness. Do a search, there was another member that had hesitation problems until he regrounded the entire engine bay...did a nice looking job of it too!

I have the hesitation anywhere above 3k, the car has an exhaust leak and it sounds like the car is only running on 2 cyls.

I would first check the grounding to the motor. If that doesn't help I would check fuel pressure and try looking into the FSM and seeing exactly how you test to see that the coil is getting the right signal from the ECU.

I swapped the plug wires again and the coil pack and no change anyone got ideas?