msladypaula
05-19-2015, 05:56 AM
I am now plagued with my car sputtering, stalling, hesitating, acting like a fool. it went from intermittent to barely driveable. Lets start off with the bad girl in question.Basically stock KAonly things upgraded is more of my suspension (not important to this thread), hks exhaust, walbro 255 fuel pump, so like i said, she stock. its a 1995 240sx Automatic with only 61444 miles. No that is not a misprint. And yes it is an obdII. i know some have the obdi. not the case. So lets rewind the issue. 9 months ago: hesitation in my car when accelerating over 50mph on highway. very sporadic. Never stalled. but when the hesitation turned more into a bucking motion, took it to a shop. IACC. Balls it sucked getting a new one. But then she ran like her old champ self. about 8 weeks ago....did my car just hiccup? very very light hesitation in highway driving. was kind of early to do this, but i figure no big deal, changed the spark plugs (look slightly lean ALWAYS the ngk plat) and changed the spark plug wires from NGK to the denso ones (i've seen it where on others, ngk wires actually contribute to the car running kinda crappy or bog like, so i figure id give it a change and see) and changed the fuel filter. thats seemed to make her happy. Moving along....Last weekHighway driving....its morning...pretty cool out maybe somewhere in 50s or low 60s.... alittle misty....traffic is moderate so i'm going on and off between 40 to only 50....PUTTPUTTPUTT... oh the hesitation came back i see; well let me just get to work ....now its hesitating like mad for abut a mile. feels like loss of power. giving gas not helping. shit. roll to side of road and ...STALL. Now she really has my attention because this is the first time she has ever stalled on me from a moving point. start her right up and take her slow to work (was at this point only a few blocks away)....some older gears heads at work and i talk cars...no one had a clue. Drove her home.... i was waiting for impending doom of another stall. ...NOPE. RAN like a champ. You kidding me right? My bf takes a look at it and says we'll take a look at it.... we go to the garage.... car was on the driveway for about 15 maybde 20s mins just idling... no problems.... then dies. we didnt even get a chance to touch. ALL hands on deck now. so now we have been going back and forth with this car chasing the tail of the neverending hesitation gremlin. BTW no CEL so we changed the maf and the pigtail (thought maybe a terminal on plug was bad cause sometimes you shake the plug, she stumbles...) still happens. Trying changing the ecu thinking its a malfunction in the unit. Nope. Change fuel pump thinking it doesnt have enough pressure or volume (even though testing i did have 37psi at idle...okay shut up i just wanted to change it anyway)no diceChange the ECT and the senor for the guage next to it. AH...... for 30 mins her idle was good. not jumpy. not shakey. next day i wanted to take her to stretch her legs and i wanted to do it from a cold start. NOPE7 mins in i heard the faint bog coming back.At 10 mins, STALL. (barely enough time to get her over and beyond the C)okay...front oxygen sensor... that looked shitty. and the reading were all over the placeREplace.... around the block.... nah still there but not so bad. scan shows a healthy pattern reading. TPScar ran much better and the hestiation seemed to be very very mild. ...Nope scratch that. next day drove, 10 mins in, bogging.... and just as we turn into the drive...stall. as many times as i could, we hooked up a scanner and tried videoing the results to see if there was a pattern. it seems like the gremlin shows up most often (but not always) during light to moderate throttle closed loop.while my car isnt showing a CEL on the dash, the scanner did have a malfunction indicator on (unfortantely i did not notice it right away, so i am not sure at what point in the process it came on)and it says rear oyxgen sensor. i can replace the rearo2 and hollow the cat if thats fried or test pipe it but im not really convinced that this is my issue.it seems too intermittent for it to be a vacleak. running out of options and ideas. trying to go through some of the FSM, but i reach alot of deadendstcc? injectors? the dizzy and the cps on the trans bell housing were changed about 2 years ago..used but working. (p1320 still haunts my dreams). i know this issue has haunted many of us...and ive hunted and tried may of the top common solutions to fix the 240sx hiccup.anyone have other suggestions ...things ive overlooked.....i feel like i am missing something. what the hell am i missing?