Hey guys I have a 1990, 4AFE sedan with about 195k. (I bought with 160k) Back in September I was driving and taking an exit ramp off the freeway when the car in front of me decided to stop abruptly right in front of me to speak with a car parked on the shoulder of the ramp. Basically I down shifted from 2nd to 1st and I was going between 31-35 mph when I let out the clutch I heard that the RPMs were high, higher then I'd like and I quickly shifted back into 2nd, I probably spent no more then a second in 1st around 31-35 mph.
A week or two later I noticed while in the passenger compartment, driving an odd noise that sounded like a light "whooshing" noise, sounded almost like air or fluid (hard to explain) A week later I'm driving and I start hearing an extremely loud grating noise, look under the car and I'm leaking massive amounts of coolant, ok so I'm guessing the water pump has gone out. Prior to the exit ramp incident I had noticed in the driveway little singular drops of fluid but I never really took the time to figure out what kind of fluid it was, but I always maintained my fluid levels.
Anyway my question is this, approx how many RPMS did I have the engine at? (I was between 31-35 mph in 1st) and is it feasible to say that my error caused the water pump to go out? I'm just worried that I F***ed up the engine and other vital parts.
4A motors are very good... You simply redlined the engine. 4AFE have rev limiters, meaning once you rev it up to that point, it cuts the ignition temporarily. 1st gear going about 30-35MPH is close enough, RPM may have been about 6500-7000 RPM.
Find out where you are leaking coolant from. A water pump wouldn't go out from a high rev, not that I know of. If the water pump is worn out, it has a weep hole where fluid should drip out from... Same goes with the other fluid you said you have been dripping. Then we can go better from there.
SCT thanks for the response! Its my understanding that the rev-limiter will keep you from over-revving when up shifting or giving it lots of throttle, but if you mis-shift to a lower gear there is nothing the computer can do to limit rpms. By all means please correct me if I'm wrong on this.
Rev limiters will cut off the ignition until the RPM drops below redline, which for the 4AFE is I think 6800 RPM. So you basically get a "rev bounce" until you let off the gas pedal or change to higher gears.
Th ECU will try to rev limit, of course the speed of the car is causing the over-rev. So until the engine braking can slow the car down enough, the rev limiter will try it's best. Hopefully you weren't on the gas pedal when you were slowing down.
Usually, a trans wouldn't let you shift to a lower gear after a certain speed. I can't shift into first when I'm going 40. 30-35mph, still difficult but feasible. 20-25, easy.
I ran 30-35mph in first gear several times before, engine gets loud especially when you have no muffler and the resonator has been removed. I have 247000miles on the engine... if any of this makes you feel better or something... strong engine.
I ran 30-35mph in first gear several times before, engine gets loud especially when you have no muffler and the resonator has been removed. I have 247000miles on the engine... if any of this makes you feel better or something... strong engine.
Actually, yeah I feel a little more at ease after hearing that, haha thanks.
hey there
don't worry bout the ordeal toyotas are tough .
i have a 4af and i'm assuming the redline is the same 6200??. i rev mine occassionally to 6000 and thats around 60km (38mph)
and i haven't got any coolant leaks but i do have a minor oil leak which has been there for the time i've had the car oh and the engine has done 266xxxkm's (166xxxmph) so similar to yours and it hasn't played up ever.
so don't worry bout screwing up the internals you won't have unless u were low on oil and didn't realise then u might've done some damage like my cousin did to his mr2 blew the engine and had to rebuild it.
hope this helps
Greg
hey there
don't worry bout the ordeal toyotas are tough .
i have a 4af and i'm assuming the redline is the same 6200??. i rev mine occassionally to 6000 and thats around 60km (38mph)
and i haven't got any coolant leaks but i do have a minor oil leak which has been there for the time i've had the car oh and the engine has done 266xxxkm's (166xxxmph) so similar to yours and it hasn't played up ever.
so don't worry bout screwing up the internals you won't have unless u were low on oil and didn't realise then u might've done some damage like my cousin did to his mr2 blew the engine and had to rebuild it.
hope this helps
Greg
Thanks! you also helped put me at ease, frankly the car runs fine and I think the water pump was already on its way out, I havnt driven it since sept because I have a motorcycle but im planning on getting it repaired this week.
Only thing that can happen during a downshift overrev on a 4A-F is to mess up the cam and crank timing, since its an interference engine, it wont really break anything, but it will make the car run funny if at all and the valve train isnt going to like it...
i bet it didn't like that, i have only been in redline once doing 100 in 2nd and it was soo loud. well i guess toyota have made a great motor a shame they didn't make it like the 4age it could've been the 4ag a non efi performance engine lol.
Only thing that can happen during a downshift overrev on a 4A-F is to mess up the cam and crank timing, since its an interference engine, it wont really break anything, but it will make the car run funny if at all and the valve train isnt going to like it...
since its an interference engine.....dont you mean a non-interference engine
since its an interference engine.....dont you mean a non-interference engine
Yeah, its a non-interference engine, so the pistons and valves arent going to hit, but that doesnt mean that the valve timing cant go off. Also when the valves stop following the camshaft as they start floating, that isnt the best thing.
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