Topic: anyone ever have vtec just stop working before? (Read 17355 times)

hotrex · « **on:** July 09, 2009, 09:33:31 PM »

yesterday car had vtec engaging properly, today i take it down the street and nothing.

i checked the wire going to the solinoid with a multimeter and when the car hit 5500 rpms the wire is showing 14ish volts. so the ecu is recognizing and sending power to the solinoid. i have a jdm solinoid with no pressure sensor so the pinout on the harness is chassis grounded. i pulled the vtec solinoid off and the screen is clear...

anyone ever have a v tec solinoid go bad? when i jump power from the battery to the solinoid i can hear it clicking... im pretty stumped. is there a certain point oil pressure wise where vtec wont engage?

my sunpro gauge was wacky on the dyno and then it just stays below zero. the guage works but the sending unit took a shit so i tried installing my new autometer one tonight and my fuckin tunertoys block fitting snapped off in the block... so i wont have an easy out and a new fitting till tomorrow... im starting to get a bit frustrated

dvst8r · « **Reply #1 on:** July 09, 2009, 09:36:18 PM »

I have had it stop when I was really low on oil...

onlyflash944 · « **Reply #2 on:** July 09, 2009, 10:07:05 PM »

Quote from: hotrex on July 09, 2009, 09:33:31 PM

im starting to get a bit frustrated

at least it hasn't cought fire yet

check oil pressure, that would seem like the number one cause. sounds simple but was possibly the car cold and you didn't have the temp check disabled?

hotrex · « **Reply #3 on:** July 09, 2009, 11:03:58 PM »

no it was up to temp. ill check the oil presure tomorrow. i hope to fucking god thats not the problem.

the pressure sensor is disabled though so vtec sould engage no matter what. whas the lowest pressure the shit will engage on? doesnt seem right though.. the motor runs awesome.

if i hear the solinoid clicking i assume its opening though....

once i get this squared away ill toss my new 1200s in it and wax the dyno...

made 320 in 14.6 psi letting off at 6k. setup should make good power once i get the kinks worked out.

chris · « **Reply #4 on:** July 10, 2009, 12:28:45 AM »

vehicle speed sensor working?

highroller54 · « **Reply #5 on:** July 10, 2009, 12:39:53 AM »

plugged oil passage would do it but you better get a gauge on that bitch first!

92CXyD · « **Reply #6 on:** July 10, 2009, 12:43:20 AM »

did you have anything tap into the v-tec signal wire of your ecu?

d112crzy · « **Reply #7 on:** July 10, 2009, 01:03:46 AM »

I've had an ecu go bad on me before. The ecu was fine, no codes or anything. It just didn't engage vtec for some odd reason. It was a converted p75. I swapped in a new ecu and it worked just fine. Try a new ecu?

crttaz · « **Reply #8 on:** July 10, 2009, 04:03:08 AM »

VTEC stopped working when Joesph swallowed a load.

d-rail · « **Reply #9 on:** July 10, 2009, 04:13:02 AM »

From my understanding VTAC won't work without a properly functioning oil pressure switch. Fix that shit then go from there.

crttaz · « **Reply #10 on:** July 10, 2009, 04:19:27 AM »

Quote from: d-rail on July 10, 2009, 04:13:02 AM

From my understanding VTAC won't work without a properly functioning oil pressure switch. Fix that shit then go from there.

JD choked and didn't swallow?

chris · « **Reply #11 on:** July 10, 2009, 04:24:58 AM »

Quote from: d-rail on July 10, 2009, 04:13:02 AM

From my understanding VTAC won't work without a properly functioning oil pressure switch. Fix that shit then go from there.

Obd2 jdm motors dont come with pressure switches

You can disable it very easily. I have the pinouts somewhere written down.

d-rail · « **Reply #12 on:** July 10, 2009, 04:38:37 AM »

Quote from: chris M on July 10, 2009, 04:24:58 AM

Quote from: d-rail on July 10, 2009, 04:13:02 AM
From my understanding VTAC won't work without a properly functioning oil pressure switch. Fix that shit then go from there.

Obd2 jdm motors dont come with pressure switches

You can disable it very easily. I have the pinouts somewhere written down.

My mistake

hotrex · « **Reply #13 on:** July 10, 2009, 05:45:47 AM »

switch is disabled and i tried a known good p28. my ecu is sending power to the solinoid when its supposed to. vtec just doesnt activizzle.

highrolller. which passage are u talking about here?

marcj · « **Reply #14 on:** July 10, 2009, 08:37:43 AM »

replace the solenoid & check wiring.. can't think of anything else aside from the tune/ecu, but you said you checked that already. Did you swap a good ECU/chip or just different ecu with the same chip?

ratcityrex · « **Reply #15 on:** July 10, 2009, 12:43:13 PM »

My vote is low oil psi.

Make sure its ok b4 you go ripping on it. The last thing you need is the Subaru death rattle....

chris · « **Reply #16 on:** July 10, 2009, 01:28:28 PM »

I agree on the oil pressure check

j.h.christ · « **Reply #17 on:** July 10, 2009, 03:04:01 PM »

Quote from: ratcityrex on July 10, 2009, 12:43:13 PM

My vote is low oil psi.

x76

happened to me too.

Joseph Davis · « **Reply #18 on:** July 10, 2009, 07:42:07 PM »

Quote from: hotrex on July 09, 2009, 09:33:31 PM

yesterday car had vtec engaging properly, today i take it down the street and nothing.

Yeah, but you had the same problem a week or two ago. It's been an ongoing concern for some time now.

And, to answer the only question worth a shit that you've asked, 50-55 psi. But as shit slops out over 20 years and 200K miles you can bet your biscuit that some heads want more.

Zeniceguycrx · « **Reply #19 on:** July 10, 2009, 08:11:12 PM »

is it throwing a code?
also, just because your gauge says your up to temp doesnt mean the ecu sees good engine temp(seperate sensor) try checking power on the engine temp sensor(2 wire not the 1 plug on thingy) also see if there is a good ground.

Joseph Davis · « **Reply #20 on:** July 10, 2009, 08:14:13 PM »

He's logging all that through Clone or S-fecesmanager, pretty sure he knows it's up tp temp.

jeffsciv23 · « **Reply #21 on:** July 10, 2009, 08:55:04 PM »

since when did volvos come with vtac yo?

highroller54 · « **Reply #22 on:** July 11, 2009, 01:36:42 AM »

Quote from: hotrex on July 10, 2009, 05:45:47 AM

highrolller. which passage are u talking about here?

the one that goes to the vetak3 soliniod, is there shit on the screen?

hotrex · « **Reply #23 on:** July 11, 2009, 11:20:32 AM »

highroller54 · « **Reply #24 on:** July 11, 2009, 12:20:45 PM »

Quote from: highroller54 on July 11, 2009, 01:36:42 AM

is there shit on the screen?

Quote from: hotrex on July 11, 2009, 11:20:32 AM

yea

bearing material?

Joseph Davis · « **Reply #25 on:** July 11, 2009, 12:29:34 PM »

So that's where that pesky oil pressure went off to.

hotrex · « **Reply #26 on:** July 11, 2009, 01:07:36 PM »

no not bearing material. looks like a tiny bit of alum shavings, prob from when i tapped and plugged the oil passage foe the lsvtec. i sprayed it but some might have been stuck in there.

chris · « **Reply #27 on:** July 11, 2009, 01:38:20 PM »

Take apart the vtec solenoid. Purple power/powerwash that bitch. Buy a new a gasket/screen for the vtech solenoid Honda should have them in stock since they are supposed to be replaced

88dx · « **Reply #28 on:** July 11, 2009, 03:14:00 PM »

Last week I had a car that the vtec wouldnt work and it was the first time ive ever seen a bad solenoid, replaced the solenoid and it worked

chris · « **Reply #29 on:** July 11, 2009, 03:16:44 PM »

wire the vtec solenoid directly to 12 volt for mad vtec action at idle

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Author Topic: anyone ever have vtec just stop working before? (Read 17355 times)

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