Hello all,
My 86 2.0 3spd is having some weird issues these past 2 week.
I hadn't drove it for almost a month now and went to start it, started just fine, idled just fine. Let it warm up and put it in gear, got out of driveway and stepped on the gas and it backfired out of the carb. Wouldn't go past 25 mph. Hasn't had any issues for the past 2 years.
Pulled back in and started working on it. First was to double check firing order and that was all set right to 1-3-4-2. PCV was good. Set a timing light and timing is all good there and checked it at tdc on the compression stroke and everything lines up. Distributor advances like it should, and it's vacuum advance diaphragm holds vacuum, and I get vacuum from the hose. Cap and rotor are also new. I then did a compression test on it and all 4 cylinders are at 150 psi. Checked around for vacuum leaks also and nothing came up. Also replaced fuel filter.
With it running I pulled one wire at a time and gave it throttle, it would backfire and stall on 1, 2, 3 but would rev fine and did not backfire when I pulled #4. Thought okay, maybe a bad wire and got a new wire set, plugs, and coil, but nope, still the same issue. Pulled the valve cover off, ran it without that to see if something was sticking but nothing was and everything looked to be running right and if a valve was not seating right, the psi in that cylinder would be low I would think.
It's not burning oil or coolant.
The only other thing I can think is that something on the carb went bad or Egr? Maybe Tps or O2 sensor? I'll test the o2 and egr tomorrow
Something else I should add, is I noticed before I parked it that it bog quick once after a while in and out of gear at idle after a minute or so kinda like vr-vr-vr-ch-vr-vr-vr (Yeah ik, I'm explaining sound via text LOL ). Also one time I had to start it with my foot pressed all the way down on the gas, so maybe the Tps is going/went bad?
Any help would be appreciated.
My buddy and I have been scratching our heads over why it decided to start doing this. It had passed smog just fine in October..
Thanks,
Fenster
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