CanWeFixIt

d16y8 vtec auto, my car wont rev past 5200 most of the time it will sometimes but not often, throws code p1259 vtec malf and a code for the knock sensor please help!

92ehatch

Oil level would be first check

CanWeFixIt

im a tech at a ford dealer all the basics have been coverd

92ehatch

What do you consider basic? I have to assume things i do not know.

If you have checked the basics post what you checked. I am not a mind reader nor anyone else. Anything you have checked should be in your first post

Have you cleaned the vtec solenoid screen?

Wires all good?

CanWeFixIt

i have cleaned screen, what i believe to be the pressure switch(what the vtec noid is mounted to) throttle body, cleared codes and test drove multiple time throws same codes. dizzy is good plugs and wires are too, im a lost chevy guy that works a ford with a screwed honda lol

CanWeFixIt

would the knock sensor have anything to do with this?

92ehatch

after you answered my first posts i would say it's very possible.

Edit: wrong years pictured

Thenameislucky

Could be the knock sensor. Maybe the plug is loose. No codes?

Former User

The knock sensor code is almost surely causing the low rev issue. Fix this code first. Here's the diagram matching your car:

CanWeFixIt

alright, thanks for the help im going to check the connections and if theyre good im going to replace the knock, if that doesnt fix it ill hit you up again
thanks much again

Former User

What engine do you have? Is it a D16Y8? Post the block and head codes.

https://honda-tech.com/honda-civic-d.../#post48684945

CanWeFixIt

it threw p1259 and knock sensor code dont remember what # the code was, block and head codes? ive just started school and not super savvy. with electronics

CanWeFixIt

p0332 or p0339 maybe

Former User

P0325

Do both codes return after resetting the ECU?

Click the link I posted.

CanWeFixIt

i think so, cant pull codes at the house in my undies

oh yes both returd

return*

what link?

Former User

See post #11.

CanWeFixIt

its cold out there...., brb..

CanWeFixIt

so ive done more research and my conclusion is the knock sensor, where is it located? anybody have pictures?

Former User

On block, above oil filter.

Do you have a D16Y8 block and head?

CanWeFixIt

yes

CanWeFixIt

my problem isnt always a problem, sometimes if its doing it ill put it in neutral torn it off and start it again and i can go over 5k/ hit vtec for a min then it does it again

Former User

Fix the KS code and then go from there.

tony_2018

Sounds like a distributor issue, but you should make sure to remediate those cel codes.