When I start the engine after it's been cooled down for hours, the rpm reaches 1000 and stays there for about 2 minutes. It then lowers to 7000 to 8000 rpm. Is this normal for cars? It's a gasoline engine.
2007-08-07 01:58:52 · 9 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
Assuming you mean it lowers to 700-800 (not thousand) rpm, then I'd say it's quite normal behavior. It runs a little faster when cold to keep the plugs from fouling as the fuel system will use a somewhat richer fuel/air ratio until normal operating temperature is reached.
Hope this helps!
2007-08-07 02:03:25 · answer #1 · answered by PMack 7 · 0⤊ 0⤋
Yes thats normal, But i think you mean 700-800RPM 7000 or 8000 would blow your head gastets. I have a 2004 Mustang 4.6L and it reves at about 1300RPM during cold starts (-10 to 50 degrees) The operateing temp of engines are usually right around 210 degrees
2007-08-07 02:19:52 · answer #2 · answered by Katie 5 · 0⤊ 0⤋
Yes it's normal. The rpms stay a little high as if the choke was on in an older car to let the engine start to warm up without stalling. Now all the fancy electronics control that.
I think it you meant to say it goes to 700 -800 after warm. ;)
2007-08-07 02:04:04 · answer #3 · answered by pappy 5 · 0⤊ 0⤋
yeah, when it starts the fuel/air ratio is higher to have the power to get things in motion and keep the fuel burning in the combustion chambers. As the engine warms up momentum helps to keep it running(fuel mix need not be as rich) engine slows down a bit. Parfectly normal. In de winter it will be longer than 2.
2007-08-07 02:16:38 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Flooded start up technique is to open the throttle and close the aggregate, then crank, because of the fact the gas evaporates you're certain to hit the terrific suited gas/air mixture for combustion. it is how I continuously began the GSIO-540s on the 421 I used to fly. Be rapid to tug the throttle back to idle whilst it starts off without oil tension.
2016-12-11 12:48:48 · answer #5 · answered by turnbow 4 · 0⤊ 0⤋
yea it is its the automatic choke dnt worry its the engine waming itself up so u dont damage it lol over reving a cold engine may damage it (bendin valves ect ) dnt worry as long as the rpm return 2 normal once its warmed up its fine
2007-08-07 02:07:07 · answer #6 · answered by ian_zz2 1 · 0⤊ 0⤋
Yes, it helps the engine warm up faster to burn cleaner.
2007-08-07 02:06:20 · answer #7 · answered by Anonymous · 0⤊ 0⤋
sounds normal to me if you remove the extra 2 (0's)
2007-08-07 02:22:46 · answer #8 · answered by mobile auto repair (mr fix it) 7 · 0⤊ 0⤋
That's the way it works. Everything is fine.
2007-08-07 02:39:56 · answer #9 · answered by Fordman 7 · 0⤊ 0⤋