Motor Vehicle Maintenance & Repair Stack Exchange
Motor Vehicle Maintenance & Repair Stack Exchange

Questions tagged [rev-limiter]

Device used in the ignition system to limit the rotations per minute (RPM) or engine speed.

Device used in the ignition system to limit the rotations per minute (RPM) or engine speed. In newer electronically controlled powertrains, this can be done through programming of the powertrain control unit/module (PCU/PCM). The RPM is preset and will not allow the engine to go past this point. One way it can limit this by cutting the spark output to certain cylinders at certain times, which will not allow the engine to rev any higher. This helps protect the engine from accidental damage caused from stresses it was not intended to withstand.

22 questions
21
votes
4 answers

Is revving the engine to redline on idle at morning bad?

I own a Ford Ecosport Diesel Turbo 1.5 TDCI. Every morning when I start the car, I put it on neutral and rev it up to 5000 RPM for 3 seconds then bring it back to normal idling without revving and start my normal drive. The intention is to clear any…
Ethical Gamer
  • 343
  • 1
  • 2
  • 6
13
votes
3 answers

What does O/D mean on a dashboard & a button under the transmission button?

My car has an O/D button under the transmission button. When I press it, it turns O/D off. When O/D is off, the revs go up more than when O/D is on. What does O/D mean and what does it do to the car? I assume whatever O/D is, it's on by default…
user9506231
  • 163
  • 1
  • 2
  • 7
10
votes
1 answer

Why doesn't my rev limiter bounce?

I have a BMW 630i Steptronic from 2007. If I floor the pedal in neutral the RPM is of course limited, but it doesn't "bounce" like regular rev limiters. Instead it keeps a constant and "clean" RPM. My old Audi A6 Multitronic 2008 did the exact same…
jhovgaard
  • 203
  • 1
  • 2
  • 5
9
votes
3 answers

How to find out if my non-fuel injected car has a rev limiter?

I'm driving a 1991 Citroen BX TGE16 which doesn't use fuel injection and I'm worried it doesn't have any fuel and spark cut off system so I don't over do it when downshifting or engine breaking. Can I downshift without panicking every time my car…
EChan42
  • 1,005
  • 2
  • 10
  • 23
8
votes
2 answers

What happens to a car engine when giving max throttle while not in gear

I was driving (well standing still actually) during rush hour, and I was suddenly wondering what would happen to a car engine when I would push the accelerator pedal all the way down while the engine is not in gear. Since most equipment these days…
Roy T.
  • 182
  • 1
  • 1
  • 6
6
votes
1 answer

Engine revs to 4000 RPM without pressing gas pedal

I tried to start my car today but something strange keeps on happening. It turns on just fine, but once the engine is operating it starts revving to 4000 RPM even though I am not pressing the gas pedal. I tried turning it on and off again and also…
hello_world_daniel
  • 63
  • 1
  • 1
  • 4
3
votes
2 answers

Do rev limiters like the Bee-R Rev Limiter cause any wear on engine components?

Rev Limiters like the Bee-R Rev Limiter are used for the purpose of capping your RPM's so that your car will not rev passed the limit it is set at. The Bee-R rev limiter works by cutting the ignition upon hitting the rev limit. This is prefered…
tqrecords
  • 859
  • 2
  • 9
  • 15
3
votes
1 answer

Does free revving diesel engine near redline for 2-3 seconds harm it

What happened is I accidently pressed the accelerator and rpm shot to 4800-4900 rpm in neutral. The engine was fully warmed-up. Redline of the engine starts from 5000rpm and revv-limiter kicks in at around 5200 rpm. Does it damage the engine or Am I…
user3855004
  • 129
  • 3
  • 3
  • 10
3
votes
2 answers

Why won't my '05 VW Caddy rev past 3500rpm?

I've got a '05 VW Caddy 2.0 SDI here that didn't run at first. Scanning the OBD (with a chinese knock-off ELM327 scanner, and the Torque Pro App) gave me a P0726 fault code. The description says "Engine Speed Input Circuit Range/Performance". My bet…
Bart
  • 2,964
  • 1
  • 13
  • 28
3
votes
0 answers

My car's revs keep dropping

Please help, should i get a tune-up. I will post a video, so y'all can get a better idea of the issue in the car. Please visit link to get an idea of the issue. https://youtu.be/rKRAHqXe3Pw
Leonardo Casita
  • 31
  • 1
2
votes
1 answer

Car revving too high in 5th gear on the highway

I drive a 2009 fiat sienna and just did my first highway drive in it and noticed it revs at 4000rpm at 130kmh. 3800 at 120kmh is this normal? Cause it always sounds like it needs another gear. Acceleration is fine.
Tronima
  • 21
  • 1
2
votes
1 answer

How do I know if car ECU has a REV Limiter?

My car is fairly new and not that well documented online (it's a new model from late 2015) For safety, how do I know if my car has a REV-limiter without testing it and letting it go up the red line RPMs? Is there a visible hardware or a sticker…
Jomar Sevillejo
  • 1,307
  • 3
  • 16
  • 27
1
vote
1 answer

Honda rev-limited at 4k RPM, automatic transmission won't shift into 5th gear, no CEL

I have a 2010 Honda Accord EX-L, with the 3.5L V-6 engine. 230k miles, all highway, so I'm still breaking her in. At the beginning of the Corona shutdown, I replaced the timing belt and water pump. I don't think this is related, as the car behaved…
psyklopz
  • 121
  • 3
1
vote
0 answers

2001 Nissan Xterra drivability

2001 Nissan Xterra SE, 3.3L V6, automatic, 2WD, towing package, 150k miles Some history, perhaps useful: I bought this vehicle from a friend a few months ago. Vehicle was in good shape for its age. Made a recent 200 mile trip with the only issue…
Michael Treanor
  • 141
  • 5
1
vote
1 answer

Why would my car be dropping in revs when in gear?

I have a 1998 ford Fairmont Automatic and recently got it back from the mechanics but have noticed it starts to drop in revs when in gear, and tries to stall. it's fine in park though.
Lou.sidorenko
  • 11
  • 1
1
2