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?
Manarius wrote:The Neo-Cons would call me a defeatist. I'd call me a realist. I'm realistically saying that a snowball has better chances in the blazes of hell than democracy has in Iraq.
1995 Polo Green Subaru SVX (189k miles - 08/2007-Present)
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.
1999 Impreza Outback Sport w/ MY02 WRX complete swap
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.
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 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.
