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MORE: Engine runs rough questions
Car Engine RPM Questions - This category contains featured questions as examples.
They relate to most vehicles.Question: 2001 Acura Integra mileage:
70,000. My car has no aftermarket parts on it. Recently I ran into a problem with
it. When the engine rpm reaches around 3000 rpm, the engine hesitates. Then the
check engine light comes on and then engine will not rev past 3000 rpm. It sounds
like there is a rev limiter kicking in. This first happened on the freeway a day
ago. When this happened I was forced to pull over. The engine will run in this condition
below 3000 rpm with no abnormal noise or roughness. When this happened to my car,
I was in the middle of nowhere. So, I was forced to drive a couple miles to a gas
station. I kept below 3000 rpm. When I arrived at the gas station, I opened the
hood and saw the exhaust manifold to the cat glowing orange. Unfortunately after
trying several things to find the problem today, I was not able to do so. I also
have a code 4, which is crank angle sensor. I have checked the crank sensor the
way that All Data says to and it checked out ok. Perhaps you can help me out. This
doesn't make sense to me.
Answer: The problem you described would indicate a possible partially
plugged catalytic converter. Remove to replace with new and recheck system.
Question: 1997 Jaguar XJ6 mileage: 70,000. The engine will
not idle down. At an idle it speeds, the rpm's go up and down from 1000 to about
1500. I have tried adjusting the idle speed on the auxiliary air valve this
has no effect on the rpms. I have checked for vacuum leaks cannot hear any.
Sometimes the car idles OK. I am new at working on Jaguars. Need help.
Thanks a lot.
Answer: It sounds like you have a idle air control motor that has
failed. Replacing the idle air control motor with new to recheck system.
Question: 2002 Acura 3.2 TL mileage: 82,000. I recently was driving my
car and I was using the sport shifter, after stopping at a light, I began to drive
and forgot to shift the gear to second. My car redlined at 6500 rpm, when redlining
is 6300. What kind of damage did I cause if any. The car has a 3.2-liter Vtec engine.
Answer: Exceeding the "redline" by 200 Rpm probably did not cause any
damage. The worst would have been some bent valves. That would cause a very rough
idle and lack of power. Most engine today will not have internal engine damage do
to over RPM's.
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