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vtec works fine when cold but bucks at 3500rpm when up to OT.

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Old Apr 29, 2022
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vtec works fine when cold but bucks at 3500rpm when up to OT.
I have a 2004 Honda civic EX sedan and it runs just fine up until it gets up to temp. When it is up to temp it bucks at 3.5k.

Just replaced head gasket, cam sensor, timing belt, water pump, rad hoses, coolant sensor and fan switch.

Any ideas?
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Old Apr 29, 2022
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Re: vtec works fine when cold but bucks at 3500rpm when up to OT.
you are in limp mode

check codes
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Old Apr 29, 2022
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Re: vtec works fine when cold but bucks at 3500rpm when up to OT.
I have no codes and no engine light. Also I have put it in limp mode and is is a much softer limit. This is a much harsher buck vs. normal limp mode.
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Old Apr 29, 2022
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Re: vtec works fine when cold but bucks at 3500rpm when up to OT.
Originally Posted by benjafish
Also I have put it in limp mode
what do you mean by you put it in limp mode?!?
The ECU does it no matter how much you want to make it go away as long as you have the issue that triggered the mode?!?
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Old Apr 29, 2022
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Re: vtec works fine when cold but bucks at 3500rpm when up to OT.
Check to make sure you didn’t miss a sensor. OEM cam sensor? Did you verify timing?
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Old Apr 29, 2022
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Re: vtec works fine when cold but bucks at 3500rpm when up to OT.
Going to guess you used a non-oem cam sensor. Put an OEM sensor in it
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Old May 2, 2022
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Re: vtec works fine when cold but bucks at 3500rpm when up to OT.
Originally Posted by GolNat
Check to make sure you didn’t miss a sensor. OEM cam sensor? Did you verify timing?
Timing seems to be correct. Sensor is not OEM. Would that be enough to do that? The old sensor was fine I just did the sensor a a precaution while I had it apart. I could put the old one back in?
Last edited by benjafish; May 2, 2022 at 12:47 PM.
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Old May 2, 2022
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Re: vtec works fine when cold but bucks at 3500rpm when up to OT.
Originally Posted by sdaidoji
what do you mean by you put it in limp mode?!?
The ECU does it no matter how much you want to make it go away as long as you have the issue that triggered the mode?!?
I purposely pulled the VTec pressure switch and spool valve plugs apart. It set codes and drove it. It was more like a rev limiter where as normally it is much more harsh
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Old May 2, 2022
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Re: vtec works fine when cold but bucks at 3500rpm when up to OT.
thanks for clarification, in the internet you never know how much someone knows what they are talking, so details are always welcome
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Old May 2, 2022
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Re: vtec works fine when cold but bucks at 3500rpm when up to OT.
Originally Posted by benjafish
Timing seems to be correct. Sensor is not OEM. Would that be enough to do that? The old sensor was fine I just did the sensor a a precaution while I had it apart. I could put the old one back in?
honda engines dislike aftermarket sensors, many solved issues after getting OEM
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Old May 2, 2022
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Re: vtec works fine when cold but bucks at 3500rpm when up to OT.
Put the old one back in
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Old May 4, 2022
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Re: vtec works fine when cold but bucks at 3500rpm when up to OT.
Originally Posted by Colin42
Going to guess you used a non-oem cam sensor. Put an OEM sensor in it

Do all aftermarket valves and other parts cause problems...I replaced a VTEC valve and getting a check engine light now?
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Old May 4, 2022
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Re: vtec works fine when cold but bucks at 3500rpm when up to OT.
Originally Posted by sdaidoji
honda engines dislike aftermarket sensors, many solved issues after getting OEM
Do they dislike VTEC valves as well please?
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Old May 4, 2022
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Re: vtec works fine when cold but bucks at 3500rpm when up to OT.
Originally Posted by Rubberboots
Do all aftermarket valves and other parts cause problems.
Just the bad ones.

NEW stands for "Never Ever Worked"


..I replaced a VTEC valve and getting a check engine light now?
Get actual fault codes first.

THEN guess lol
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Old May 4, 2022
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Re: vtec works fine when cold but bucks at 3500rpm when up to OT.
P1269 Vtec valve
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Old May 4, 2022
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Re: vtec works fine when cold but bucks at 3500rpm when up to OT.
Most likely new valve is junk
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