i just finished my ls/vtec. problem is i have no vtec. i have a stock p72. my vtec is wired a4 and d6. its in a 92 hatch that was not wired 4 vtec. i also have a ls dizzy in there short 1 arm. stock engine harness 4 the gsr. do i need knock sensor wired some how? will vtec work with ls dizzy? will vtec work with no o2? will bad vacume stop vtec? im new 2 this and have no help. this ls vtec has been a pain. please some1 help her come 2 life.....................................

 

interesting.....who did the swap for u? did u use the stock gsr wiring harness? and what kind of pistons r u using?

 

shop did block. 01 type r pis, peened ls rods with apr main and rod bolts. i put the engine together. runs great. 280 4 miles and it keeps gettin stronger. still no vtec. tomm im gonna do knock and 02. hope that works.............

 

yes gsr harness to the fire wall

 

any check engine lights ?

 

just constant. no code

 

Vtec no respond check o2 sensor!

 

so the vtec wont work if the o2 aint right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jojovtec &raquo;</TD></TR><TR><TD CLASS="quote">so the vtec wont work if the o2 aint right?</TD></TR></TABLE>

yes it will.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jojovtec &raquo;</TD></TR><TR><TD CLASS="quote">just constant. no code
</TD></TR></TABLE>

what do you mean just constant? did you jump the service plug?

 

Vtec will work without the o2 sensor, gas milage will be horrible. Did you acctually check the ecu codes by jumping the grey plug under the passenger side dash? If you checked your code and it is a still light, it signifies that the ecu is not functioning correctly.

The LS dizzy works fine. Make sure the Vtec solonoid is grounded properly.
Just be sure that there are no ecu codes(double check).

 

Pull the codes for us and then post them here.

 

no codes at all. no vtec eaither
someone said something about evap sensor on gsr im. any1no bout this?

 

if your obd2 , and dont have the knock sensor, wouldnt that show a code?

you said earlier your light is constant, what did you mean?

how did you check if you had codes exactly?

 

i godt obd1 setup. head and ecu. im getting a code 6 whitch is collant temp senor and sence this code came my car wont start. this project is becomming a nightmare

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jojovtec &raquo;</TD></TR><TR><TD CLASS="quote">just constant. no code</TD></TR></TABLE>

knock sensor... if u reset the ecu and turn the car on, it will rev to redline for the first sec, and go into vtec, then nothing... just 6200 or somethin

 

yes, there is an evap sensor on the manifold. or there should have been at least. i have a jdm gsr (sirg) manifold so i had to take the evap off of my LS mani (the jdm manifold didnt have the two bolting locations directly on top of the manifold)... did you? i think theres a line that goes to it. maybe fuel, if you dont have that hooked up, i feel like you'd be spewin fuel, unless it was blocked. i dont know im confusing myself somone help me out

 

if the ecu is throwing coolant temp sensor code that is the reason. see your car has a few maps it runs off of. for instance when you first start your car for the first time in the morning it has a lower rev limit like 7000 or something. once it gets to a specified temp then it switches over to the primary map. which allows you to rev higher and vtec should engage. you do need a knock sensor or get your ecu chipped to not look for it.