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I am having issues with my car not accelerating after 4000rpms. When I gun the engine hard to pass someone or even to go fast it revs out at 4000rpms. I have to let of the gas so the car will accelerate. No the car accelerates fine if i'm not at 4000rpms. Does anyone have a clue as of what this could be.

 
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Do you have VTEC? Maybe the solenoid is clogged.

 
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Does it throw a code? 4000 rpm cutoff is limp-home mode IIRC. I'd also check your coolant level.

 
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Vtec oil pressure switch.

 
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Check your vtec solenoid see if it's bad or clogged, if that's not the problem then your ecu went into limp mode and would need reflash

 
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Year of car?
Model?
Body?
Trim level?
Your location?

So are you saying.... if you back off the gas pedal and accelerate gently, it will go above 4000 RPM?
That might not quite describe a VTEC issue....


What codes are in it?
What testing have you done?
Any other symptoms or issues?

 
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I just experienced this last night. Car was driving fine. Check engine light comes on, try to accelerate and seems to hit a rev limiter at 4000 rpm, works fine under 4k rpm. Will check it out in the morning when I can get into the garage and out of the rain. Thanks for this post!

 
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P1259 VTEC code? Check and fill the engine oil.

 
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Didn't get to check the code but checked the oil. 2 holes on the dip stick, top and bottom. oil level was BELOW the bottom! Mind you all, I have just picked this car up within the past few days. Blue 2004 Civic EX 2dr Coupe, 96k miles, Automagic! Had an A/C problem, power transistor was the culprit, thanks to this forum for helping me figure that out! Now this, and again, thank you to this forum and Ezone for helping me figure out the problem and fix!

UPDATE: Filled oil, reset ECU. Check engine light came back with same issue. Gonna check the vtech solenoid and pressure switch soon... gots to do dinner first.

 
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did you get the problem fixed? just wondering since you had started the thread. I'm also facing the same problem with my car. gonna work on it later.

 
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Not sure about where you are at, but I often see rodents that like to eat wiring here.

 
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There was a period in the '90s when Mercedes-Benz used biodegradable insulation in its wiring harnesses, to more easily reclaim the copper -- in all of them. So after five years, systems on post-'92 W124s and W210s up to '96 are literally fire hazards, no matter how well you take care of it (short of replacing all wiring with pre-'92 or post-'96 harnesses).

The chewing by animals made headlines after Denver Int'l Airport had an attack of bunnies in its long-term parking -- turns out the ignition cables on post-'02 cars used a soy-based insulation which bun-bun loves like pecan pie.

Never saw so many rodents killing electrical, as I did in Seattle, though. They like the residual heat, so nest in airboxes... then eat filter elements as well anything they can choke down -- rubber, cork, plastic, insulation.

 
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I was working in a Benz dealer when those harnesses first began falling apart. Fun fun.

Same problem wiring plagued 95-97 Contour/Mystique, there was a warranty extension on some of those.
Same again for some Mopar minivan engine harnesses, deteriorate from the heat.


I forget the year it began (I know you said 02 but it sure seems like it was earlier than that), most of the insulation on automotive wiring is soy based. I recall we suddenly started having serious rodent damage issues across all car lines that use it. Not so bad for cement area dwellers, but absolutely horrible for almost everyone else near dirt or a field.

Honda sells this stuff now:


....You can tell it must be good stuff, there is an "X" where the eyes should be!

Also available on Amazon

Actually, the tough mice eat right through this stuff like candy.
Those must be the same mice that snort lines of d-CON like cocaine.

Not kidding:

 
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Took the V-Tec Solenoid off, all wires and connectors looked fine, cleaned the little screen filter, (wasn't dirty or anything but cleaned it anyway) made sure the piston in the solenoid was moving easily, it was, put 12v to the actuator and it clicked. Removed the oil pressure switch, cleaned it and gave a few good tappings, put everything back together, reset the ECU and went out for a test drive. Everything seems fine now, no light, no rev limit, got up to 90mph in a hurry but had to slow down as its peak traffic here in Hawaii from 11am - 7pm. If it happens again, atleast I'll know for sure its the oil pressure switch. Thanks again everyone for your help!

 
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glad it's working fine (for now :P)

 
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IIRC, some articles about that Denver story specifically singled out Mopar sedans and minivans as being a target. Ford sure wasn't winning many fans with their Job One in the mid/late '90s...


I'd read about the M-B wiring issue since the late '90s but didn't know a similar problem with soy-based insulation and rodents existed until the Denver incident -- and if it's supplier-based, then man does it potentially make a lot of vehicles in rural areas unsafe -- imagine a short in tall grass under a truck or something.


That is awesome. Got lucky with mice in my vehicle in my massive but derelict shed in WA... was always wondering if a big ol' wolf spider was gonna haul **** out of my SV's airbox after cracking it open overnight. Ended up using this peppermint-oil-based roach spray in the shed, which miraculously repelled both the mice and spiders (no more droppings after about a month's weekends of spraying)

Man do rats grow big in the country though, holy moly. Found a dead one in a Craigslist '03 CBR954RR a friend wanted me to check out with him back in '07... 8" long no tail. After I'd found that tucked next to the fairing on inspection (and nearly puked my guts up after it broke in half full of maggots trying to remove it)... we got that bike pretty cheap.

 
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I have the same issue. 05 civic lx 4dr 1.7L

 
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The thread is 6 years old, start your own thread if you want help