Last week it snowed and my car had been sitting for a few days and when I finnally started it, it drove for about 5 miles before the tachometer gave a reading. This happened again this week when it snowed a little and the car had been sitting for a day or 2. I've had this problem before, I've never really figured it out. Also sometimes I will be cruising and the engine will go a berserk, rpms will jump up and down repeatedly and the engine will cut on and off. Sometimes cuts off for good. I've changed ECU's 2 times in the last year and now I have a reman, the problem just keeps comming back. Whatever the problem is, it is killing my ECU's i believe. Also the car misfires/hesitates noticibly ONLY under 4000 RPMS, more noticible when the car is not yet warmed up. I think all of these problems are tied together somehow. This has been a nightmare, ANY INFO/HELP/SUGGESTIONS, are greatly appreciated.

any CEL's? and if your car is bucking and lunging, it may be a spark issue. how long ago was it since you replaced your plugs, wires, and coil? as far as your tach messing around..maybe a bad connection, grounds out somewhere...i dunno.

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2011 Nissan Xterra Pro-4x

2007 Kawasaki Ninja 650R

1996 Mitsubishi Eclipse RS-NX 75 shot, AEM CAI, P&P t/b and intake mani-SOLD

1964 Buick Electra 225-all original, all power options, 325hp, 445ft/lbs tq

Sounds like you have a short in the harness.

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'95 Eclipse TurboGS (garage deco)
'95 TSi AWD (restoring a survivor)
'97 Talon ESi-T (poor impulse control)
'99 Eclipse RS-T (daily beater)
'13 Evo X (mostly stock)
'17 Sienna (Middle Aged Dad Mobile)



Factory Service Manuals: http://nawdu.de/files/

I had the same problem after installing the safc, the problem was loose conections. So if you haven't soldered or crimped anything to your ecu harness just go with what ^^^ said, shorted harness.

That might also explain frying ECU's.

Red 97 Eclipse GS (420a) MTX
Custom Garrett T3 Turbo system
Megasquirt w/52 lb/hr injectors & a Walbro 255
Kicker/Alpine Audio (3 amps, 2 subs)
90 Cav 2.2 TBI auto (winter) <- yeah, it's fast

Yeah... Its been doing it for over a year now, on and off. So only chance of finding it would be to start at the ecu and trace all the wires until I find the short?

I give up, I'm selling this POS.