Setup:
JDM B18C (balanced, internally stock)
Spoon ECU (P73)

Symptoms:
When the car is at speed, the rpm raised and when it reached ~6K rpm, the car would bog down for a split second then fire back up again. The CEL would come on as the car bogs down. And it feels like it has no vtec. But the weird thing is that sometimes it happened at ~4K rpm, sometimes ~7K. But 6K happened most most frequent.

Every once in a while, it wouldn't bog and vtec would kick in. So seems like something is bad, but would still work fine every once in a while.


Guesses:
1. Bad rotor and cap that caused some kind of misfiring and disabled vtec. (hope it's that simple.)

2. Bad vtec solenoid that when the ECU wanted to change to vtec map, the solenoid didn't coordinate, so the ECU had to change back to non-vtec map --- and this hesitation caused the bog.

What do you tech guru think? Any other reasons that would cause the above symptoms? And if you need any more information to diagnose the problem, please let me know.

Any information would be greatly appreciated. Thanks!

 

What code is thrown when it does bog?

When was the last time the cap/rotor/plugs/plug wires were changed?

If its been a while, I would start there by changing those four things.

If they are fairly fresh, then try taking off the VTEC solenoid and cleaning the screen out.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Patch &raquo;</TD></TR><TR><TD CLASS="quote">If they are fairly fresh, then try taking off the VTEC solenoid and cleaning the screen out.</TD></TR></TABLE>

What is the screen that you're referring to? Is it the round piece that spins?

 

https://honda-tech.com/zerothread?id=731477

 

Thank you very much. I suck at the search (forgot about the archive)....

 

I just pulled the solenoid out. The screen is very clean.....

Anyone knows what symptoms it would have for a malfunction solenoid?

 

^^^
any ideas on why a car would bog like that?

The CEL doesn't stay on, it just "blinks" as the engine bogs, then it goes away......

 

not sure. all i know is that mine did that when i had my vafc set super low. i tried it at 4500 engagement and it did it. I switched it back to 5000 and it has been fine ever since.

so I'm guessin it is more like problem #2, but if your screen was absolutely clean, maybe just a bad solenoid? DONO sorry.

 

I had a very similar problem and it ended up being the distributor.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Wai &raquo;</TD></TR><TR><TD CLASS="quote">^^^
any ideas on why a car would bog like that?

The CEL doesn't stay on, it just "blinks" as the engine bogs, then it goes away...... </TD></TR></TABLE>

the ecu should still store the code
does your car have the service jumper, to check the CEL codes?

 

fuel filter,timing,grounds,ignition system..could be a bunch of things

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dan GSR &raquo;</TD></TR><TR><TD CLASS="quote">the ecu should still store the code
does your car have the service jumper, to check the CEL codes?</TD></TR></TABLE>

When I tried to get a code, it gave me a lit up CEL... no long or short blinks, just a lit up CEL. That means "no code" right?

Edit: I think that's the problem since everytime I shut off the car, I turned off the kill switch so that might have erased all the code stored.

 

well run the car and get ti to throw the code
jump the harness and retrieve the code
if you know what the codes are then you will have no problem figuring out what it is

i am thinking maybe something with the dizzy like kendall said or something to do with VTEC operation (solenoid, wiring grounding out at certain engine vibrations and many many more things to be at fault)

keep us posted