04 Civic "redlines" at 4000rpm

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Aug 23, 2015

scootz_7

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04 Civic "redlines" at 4000rpm

Just recently bought a 2004 Honda Civic and am having what i hope is a minor problem hoping someone can help me out.

When driving the car in any gear it has no acceleration or power and will only reach 4000 rpm (slowly) but in neutral it will rev beyond 4000.

Any input would be greatly appreciated

Thanks

Aug 23, 2015

ezone

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Re: 04 Civic "redlines" at 4000rpm

Got Check Engine Light?
Got codes?
Got oil?
Got cam timing??
Got exhaust restriction?
Got intake restriction?

Does it accelerate better if you don't floor the gas pedal?

Aug 23, 2015

scootz_7

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Re: 04 Civic "redlines" at 4000rpm

Check engine light is on even tho is was just safety/e-tested yesterday.
Codes
P0300
P0301
P0302
P0304
P0420

It does seem to accelerate a bit better at about 25%-50% throttle

Aug 23, 2015

ezone

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Re: 04 Civic "redlines" at 4000rpm

Quote:

It does seem to accelerate a bit better at about 25%-50% throttle

I'd suspect a clogged exhaust
You have a cat code, has the cat broken apart and clogged up the rest of the exhaust? Is the cat itself clogged?

EX? LX? Can you disconnect the exhaust in front of the cat as a test?

Does it misfire now? Misfiring can and will destroy a cat. Fix all other running problems before putting a new cat on.

Aug 23, 2015

scootz_7

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Re: 04 Civic "redlines" at 4000rpm

Also just had an oil change yesterday

Aug 24, 2015

xRiCeBoYx

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Re: 04 Civic "redlines" at 4000rpm

Just to clarify for OP..

P0300: multiple cylinder misfire
P0301-P0304: Misfire in cylinder 1-4 (respectively)
P0420: Catalyst system under efficiency threshold

That 4000RPM "redline" means your car is in limp mode to save itself from damage.

Aug 24, 2015

scootz_7

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Re: 04 Civic "redlines" at 4000rpm

So how would I go about getting it out of limp mode? Does that mean the engine is toast or will it be fine after getting it off of limp mode?

Aug 24, 2015

ezone

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Re: 04 Civic "redlines" at 4000rpm

I don't think it is in limp mode, those codes listed do not cause that failsafe mode to come on.
Plus, OP stated this: but in neutral it will rev beyond 4000.
IMO, that's not limp mode at all.

Aug 25, 2015

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Re: 04 Civic "redlines" at 4000rpm

Quote:

Originally Posted by ezone

I don't think it is in limp mode, those codes listed do not cause that failsafe mode to come on.

Yeah, I thought about that after I posted and figured you'd correct me. Lol

Quote:

Originally Posted by ezone

Plus, OP stated this: but in neutral it will rev beyond 4000.

And clearly, I can't read.

Aug 25, 2015

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scootz_7

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Re: 04 Civic "redlines" at 4000rpm

Could it be as simple as my catalytic converter being clogged? It is clogged and falling apart from the inside so I irdered a new one yesterday.

Aug 25, 2015

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ezone

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Re: 04 Civic "redlines" at 4000rpm

Quote:

Originally Posted by scootz_7

Could it be as simple as my catalytic converter being clogged? It is clogged and falling apart from the inside so I irdered a new one yesterday.

Yes, see my reply in post #4.

YOU MUST FIX THE MISFIRE PROBLEM BEFORE INSTALLING THE NEW CAT !!!!
Even a brand new cat can be ruined in a matter of minutes if the engine runs bad enough.