Car Bogging Between 2500-3500RPM - ISSUE HAS BEEN FIXED!!!!!

**tiksie** · 14-10-2009 06:20 PM

Originally Posted by 90LAN

vtec is not engaged when cold tahts why

So the VAFCII isn't really working as much when it's cold and only kicks in when the engine is at normal operating temperature ?

**vinnY** · 14-10-2009 06:23 PM

vafc does nothing but intercept the signal and trick the ecu into triggering vtec at a higher or lower point
vtec won't activate when the engine is cold period

**tiksie** · 14-10-2009 07:54 PM

So that means removing the VAFC will do nothing then ?

I've never hit vtec when engine is cold, im not dumb enough to even try that lol.

**vinnY** · 14-10-2009 08:08 PM

shouldn't do anything really
with a hesitation i'd be looking at fuel/spark related stuff
maybe a worn dizzy rotor or something

**02gzm** · 14-10-2009 10:58 PM

If it's happening when it's warm then x2 for a dizzy component.

**MM89** · 15-10-2009 10:06 AM

First of all; apologies for thread hijacking.

I have a similar problem; there seems to be some hesitation along with noise
recently particularly around the 3,000-5000rpm range when half throttle
or greater is applied. If i was to apply full throttle and it works it way up
to redline, the noise disappears.

The noise still remains but the hesitation seems to have slightly disappeared.
Also vtec did not engage 2 days ago for about 10 minutes and even when
it would engage afterwards, it wasn't pulling as hard as it usually does.

The noise is definitely coming from the engine bay and sounds like metal rattling.

Any ideas?

**02gzm** · 15-10-2009 02:47 PM

^^ Exhaust heat shield might be loose?

**tiksie** · 15-10-2009 03:18 PM

I'll be removing the VAFC on the weekend.

Will let you guys know how I go.

How would I go about checking the dizzy without putting a different one on ?

I forgot to add that the car is running really rich, whenever I rev the car in the garage the garage door has a wet black stain on it, I'm assuming this could be a shitty tune ? It was tuned at TODA and made 105KW, I don't remember the date on the dyno print out though.

**Limbo** · 15-10-2009 03:32 PM

did the settings change by accident?
Mine's hesitating at the moment also but i think mine is due to different ECU

**MM89** · 15-10-2009 08:36 PM

Originally Posted by 02gzm

^^ Exhaust heat shield might be loose?

that's something to check up on
but does that really explain the engine hesitation?

it feels like rpm is rising slowly and power isn't. once it has
bypassed that rev range, things seem normal. i've noticed a
slight drop in engine oil level but this might also have been due
to redlining alot to make sure vtec was working properly,
consistently and bringing the power that it usually does.

**bennjamin** · 15-10-2009 08:42 PM

dude. Car should never run that rich. Try and swap with another compatible ECU and test already lol. Clearly the car is running like shit.

**tiksie** · 15-10-2009 09:05 PM

Getting home by 7pm every day doesn't help

Gonna remove the VAFC saturday morning and see how it goes, if still running rich can I come over on the weekend ben ? For a quick swap over to see how that goes ?

Thanks,
Aytac