95 max battery new, today no problem starting, engine running ok on idle then, at 2000rpm motor bogs losses power. changed fuel filter, air filter good. Watched air intake at manifold, and reved up throtle cable, inspected and saw the intake door open and at about 2000rpm, it fluters closing, and losses power. won't go past 2000rpm, drove to and from work took a long time got car up to about 57mph, took a long time to get used to this. Can you please help me..
My 95 did this exactly to a Tee. After trying several things, like cleaning/replacing MAF, fuel injection cleaner to no avail, I ended up unplugging my battery overnight to reset the ECU. The next morning, I put cleaned old MAF and put it back on. Then hooked up battery. Started up, no bogging at 2000 rpms, no stalling, etc. The new MAF was an aftermarket that I bought on Ebay for $86. My car didn't like the aftermarket MAF, so I wouldn't recommend. Anyway, that was 2 weeks ago, and everything is still running good. Hope this helps.
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new spark plugs this decade. (a tune up?0
the filter is part of all 60k tuneups. letting it clog wrecks good pumps.
my wild guess, its lack of fuel flow, do to old filter.
or low fuel pressure.
car is identical to a Corolla. so is not unique or rare as some Geo cars are.
the cam belt not changes, invites valve kissing piston tops. BOOM
end of engine. (costs more to fix then worth of car)
the word is bogging, my engine bogs
if if bogs WOT (wide open throttle) and dont catch up < ITS NOT THE TPS. ever.
tps bad causes short bogs, called hesitations.
The map sensor , is what measure air flow and the ECU matches fuel to this air flow.
my guess, is it does that, but fuel pressure is like 15PSI, bad.
you may have a restricted catalytic converter plugging up exhaust flow and bogging down the engine. on the vq35 engine there are 2 precats located right under the exhaust manifold and it is then plumbed down the downpipe and into the main catalytic converter. i would remove the downpipe and inspect the the condition of the catalyst.
Sounds like wiring problems with the engine harness. The oil pressure not working could cause the hard starting problem. The idle problem could be a faulty idle air control valve or a vac leak. I would start with the check engine light and find out what the codes are.