ok i have a 1991 Mitsubishi 3000gt vr4, i just took it out for a drive tonight and it cuts out under throttle and it wont rev above 2700 rpm's, idles fine sounds like its miss firing though. could be the spark plugs, ill have to investigate the track opens tomorrow evening and i will have to figure it out before then, but if you guys have any thoughts then don't be afraid to jump in and say something thanks!!!
and they look like new plugs (NGK) but i havent looked at the back ones yet cus i dont want to pull the intake manifold but its not a big job. could it be a dirty mas air flow or tps sensor? i have one vacume line not hooked up off my intake up near the throttle body, wasnt sure what it went to but it ran fine with out it for 1 week without it. its just a bi*^h to plug in
hmm, uneducated guess but it doesn't sound like misfiring to me. Sounds more like it's not getting enough air, or fuel. I wouldn't go changing the plugs just yet.
I just got my 92 vr4, which is my first turbo car. Sometimes it would stall out when I started it, and it would also kind of "choke" when giving it gas, mostly during the first few minutes of driving it. I found out about this "coking" of hot fluids, realized that these things mostly happened when it was warm and I was driving it hard. Now if I do, I let it idle for a couple minutes before shutting it off... poor man's turbo timer. No more problems.
If it's "misfiring", as i could have easily been convinced mine was doing, there are many other possible reasons than plugs.
so i drove it again last night i could take it just up into boost range and then it would start cutting out, im pretty sure its not a boost leak and i hooked up that one vaccume line i was talking about, but i would just start to drive it and then at about 2000-3000 rpm it just bogs out and "gallops" but in eutral or with the clutch disengaged i can rev it as high as i want to. all the fluids are good too!
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