Rep Power: 0

i recently had some work done on my 2005 civic ex 5sp, my timing belt slipped off and bent all my valves, so i had the shop fix it since i love my civic and don't want to part ways with it yet. anyways before it went into the shop it drove normal with the rpm redline at about 7000rpms but now after its been fixed it won't let me get it above 3750 rpms. also my check engine light is on for a fuel pressor sensor, or an oil pressure sensor. could that be the cause or could the shop have inadvertently lowered the ceiling on my max rpms?

Thanks

Iamawookie

 
Rep Power: 367

Check engine oil levels.

 
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thanks, i checked and its at the right level. it looks like they changed the oil too.

 
Rep Power: 367

And before you reply, did I mention engine oil levels?

Whoops.
Which code?

 
Rep Power: 367

The ecu is in safe mode, rev is limited to not to destroy engine.

 
Rep Power: 518

I got news for you: They are not finished yet.

Return to the shop and make them finish the job correctly. No extra charge.

Nobody bothered to test drive it before returning the car to you?


Did you just get the car back today? Return immediately!
There is no such thing on a gasoline burning car

On the VTEC valve. Check for a disconnected or broken switch on the valve.

Only by a fault. They can't reprogram the computer or anything like that to cause it.

 
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Is there a way i can reset ECU from home. the shop i had fix it is about 3 hours away as my car broke down while i was visiting family and I'm back home with it now.

 
Rep Power: 518

Read the code, diagnose it, figure out the problem.
Solve the problem, erase the code, and you may then drive normally.



Or...Erase the code and drive it until the code resets. As soon as it resets the code, you are in slow mode all over again.


What's the code?

 
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Sorry for the long delay in responding. so i checked the code and its P2646, low oil pressure. I replaced the oil pressure sensor, erased the code and did an oil change and changed the oil filter, but it came back within 20 minutes of driving. Anyone have any other ideas?

thanks
Iamawookie

 
Rep Power: 0

I would love to bring it back to the shop, but my car broke down while i was visiting my parents 3 hours away, I'm not able to get back over there right now. the check engine light came on when i was almost home.

 
Rep Power: 0

the code is P2646

 
Rep Power: 518

P2646 is defined as VTEC oil pressure switch low voltage. Could be due to low pressure, or maybe not.
(Mice love to eat wires -- here in the cornfields where I live.)

Got freeze frame data from when the code set? Please post it if you do, I would like to know what the engine RPM was at the time the code set.






Have you inspected and if necessary cleaned or replaced the filter screen embedded in the VTEC gasket?

Has the cylinder head been off and apart in the past?
Check out what happened to this one after having the cylinder head apart: https://www.civicforums.com/forums/3...ing-p1259.html




EDIT: I solved a VTEC code on a Pilot by installing a factory oil filter on Friday.

 
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I don't know exactly but normally when i am driving on the highway my rpms are about 3250. I don't know where to look for the embedded screens in the vetch engine. i don't think the cylinder head was ever removed before.

Thanks

 
Rep Power: 518

Oooh, that could be right in the RPM range where the valve is activated.


Is that the condition when it set the code?


The computer had to see that the state of the pressure switch remained on when the solenoid was turned on, (or the switch stayed off when the valve was turned off) and it had to see this condition for at least 5 seconds.
(The switch must change states within 5 seconds of the valve changing states.)
So it would seem that the VTEC solenoid did not open (or close) the oil passage, the oil pressure change from the valvetrain oil circuits did not reach the switch at the proper time for some reason, or the computer couldn't see the switch change states for some reason.

Or maybe the engine really does have insufficient oil pressure, which would probably need to be verified with a mechanical pressure gauge. Low oil level is a major cause of this.




Remember I said I replaced an oil filter for a VTEC code in the Pilot, the aftermarket filter it had was causing too much oil pressure drop.
A factory filter boosted the measured pressure at the VTEC by about 10 PSI on that one. Food for thought.



It's part of the gasket between the VTEC valve and the head.

Random GIS pics of random VTEC valve stuff, these may not be your exact parts:




Still may be worth checking what was in the linked thread anyway. Valve cover is pretty easy to remove IMO.


HTH

 
Rep Power: 518

Another thought

The computer cannot tell if the solenoid or its wiring is any good (the single wire thing on top).

The computer can only see the pressure switch to determine if the valve actually worked when it should have.

Wiring all properly connected?? You may not be able to see it easily. You may need to remove the big air breather boxes to find it.

 
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Thank you so much, let me try these and i'll let you know how i turn out.

thanks

 
Rep Power: 0

ok, so i worked on the car on sunday, (two days ago) and i found that the single wire going to the solenoid on the vtec valve was not filly plugged in. after checking to see if the screen was clogged which it wasn't, very clean, i re-attached everything and i have been running the car with out a check engine light or my low limit on rpm's. yay. thanks for your help. i hope this really did fix my issue and i appreciate all your help.

Thanks