Sticky VTEC and poor cold running

Crazylegs

Advanced Member
Messages
5,224
Hey all,

I've mentioned before I've had an issue with a slightly sticky VTEC and also running from stone cold the car is hesitant, it goes into an almost limp mode of sorts for a minute or so as if it's not getting enough fuel in and then it's fine.

I thought when Chris mapped it it may have eradicated these issues and it hasn't, and the change of exhaust to the RM01A also hasn't cleared it. A fellow forum member has suggested getting a new VTEC solenoid gasket, will this be suffice and could this potentially be the issue?

Any idea why the Honda settings would be causing the car to run poor from cold? Also why it's hesitant instead of being a smooth crossover into VTEC?

I'm keen to fix these issues before it goes in for a map tweak at the beginning of September.

For people's information the car didn't throw up any error codes when Chris was mapping the car.
 

Jvzr

Advanced Member
Messages
305
Is it when cutting into VTEC it hesitate?
Once it settles in VTEC is it ok?

Sent from my Redmi Note 4 using Tapatalk
 

Crazylegs

Advanced Member
Messages
5,224
Hey dude

Tegiwa intake.

Bascially as it engages VTEC it's ever so slightly hesitant, as though it's sticking slightly and then engages.

Power delivery is all good otherwise, once into VTEC it pulls very strong it's just a second of so of hesitancy in all gears.
 

DC5Curn

Advanced Member
Messages
224
Wouldnt you need a new Solenoid as changing the gasket wouldnt make a difference would it?

Dont they have a filter that can get clogged aswell?
 

Crazylegs

Advanced Member
Messages
5,224
Think you could be right there, I think the filter does get clogged too as oil goes through it.

Do you think that could be causing the sticky VTEC? It's not as though it doesn't engage VTEC which is weird, just sticks then engages.
 

SamDC5

Advanced Member
Messages
1,433
Something definitely sounds off, the only reason I can think it would run poorly when cold is IACV.

It is known the solenoids can become 'sticky'. It's well worth taking the VTEC solenoid off and replacing the gauze. It's fairly easy to access and its held on with a few bolts.

It's hard to give advice without seeing the car and how it reacts but based on the information you've given those are the things I would investigate.

Sent from my SM-G955F using Tapatalk
 

Crazylegs

Advanced Member
Messages
5,224
I thought the same, IACV but from what I‘ve read this affects the revs and cause it to rev hunt when warm, mine is fine when warm so I‘m not sure whether it is the IACV. It‘s no major issue just a tad annoying but I can live with it. More keen to sort the hesitant VTEC out.

I will try purchasing a new gauze for the Solenoid and see if it helps.
 

Crazylegs

Advanced Member
Messages
5,224
ollieh17 said:
I was right about the exhaust then lol... did you ever do a compression test?
Ha ha you're not right yet lol, I haven't had it remapped yet so I will come back with the results.

Not had it compression tested as it was booked in for its MOT and a load of other things so I didn't get the compression done as the guys doing the work were rammed.
 

mikegsi

Moderator
Staff member
Messages
6,095
Hey all,

I've mentioned before I've had an issue with a slightly sticky VTEC and also running from stone cold the car is hesitant, it goes into an almost limp mode of sorts for a minute or so as if it's not getting enough fuel in and then it's fine.

I thought when Chris mapped it it may have eradicated these issues and it hasn't, and the change of exhaust to the RM01A also hasn't cleared it. A fellow forum member has suggested getting a new VTEC solenoid gasket, will this be suffice and could this potentially be the issue?

Any idea why the Honda settings would be causing the car to run poor from cold? Also why it's hesitant instead of being a smooth crossover into VTEC?

I'm keen to fix these issues before it goes in for a map tweak at the beginning of September.

For people's information the car didn't throw up any error codes when Chris was mapping the car.
Hey, old post revival but I’m trying to solve some cold start issues too.

when starting from cold my car runs very lumpy with the revs bouncing and ‘hunting’ but rough sounding . If I leave it I get the P2647 code which relates to the VTEC Solenoid. If I blip the the throttle a second after starting it seems to sort the idle and the car runs perfect. It only happens when the car is cold and hasn’t been started for some time.

I replaced the filter but that had no effect. I’ve deleted the IACV but had similar issues before I deleted it.

Not sure whether to replace the VTEC Solenoid as it’s quite an expense to sort out a cold start rough idle?

My setup is a K24a3/K20z4 Frank build in a FN2.
 

futureal33

New Member
Messages
1
Think you could be right there, I think the filter does get clogged too as oil goes through it.

Do you think that could be causing the sticky VTEC? It's not as though it doesn't engage VTEC which is weird, just sticks then engages.
Hi mate, I am having the exact same issue following my car being off the road, dry stored for the last 6 months.

Looking at my Hondata Kpro datalogs, when VTEC engages (on mine, Chris mapped it at 3800rpm) there is a huge rich dip down to 9-10AFR just for a few hundred rpm, then it picks up again about 4500rpm and pulls really hard to redline.
You can really feel the dip in power at 4000rpm - instead of it going into VTEC and picking up speed, it feels like the opposite and the car hesitates and bogs down (just for a few hundred rpm)

Looking at the logs, you can clearly see it (pic attached, circled)

Chris mapped my car with perfect AFR all the way from 2000-8500 and there's no way it left his garage with the AFR like this, so something has definitely happed while its been off the road.... but I've absolutely no idea what.

Could a sticky VTEC solenoid be the issue here?

This only happens for a few hundred RPM right as VTEC engages but then it pulls really hard all the way from that point on.

Just to rule it out, I altered the map so that VTEC kicked in at 6000rpm and guess what - the 4000-4500rpm rich dip was gone, but just as VTEC engaged at 6000rpm there was another significant NEW rich dip right at that point, so I am kinda convinced it is VTEC related rather than fueling / fuel tables etc
 

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oceanbet

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