I just swapped in the h22a4 w/us p13 ecu a couple of weeks ago and i am having a problem with my vtec. the ecu is running fine but my cars check engine light is coming on the cel is for a bad knock sensor. what i need to know is do i need to run a knock sensor w/this ecu for vtec to work. the car only revs to 6500 and another ht member told me i need a knock sensor to run vtec unless the ecu was overrided to not run a knock sensor. I have already checked the vtec solenoid and the screen checked the wiring and oil and everything seems to be fine. i already searched the archives and i didn't find a solid answer. do you guys have any other suggestions before i take the head off

 

why are you taking the head off?

 

wait wait wait..... so your are throwing a KS code and your are in limp mode? ok so why are you going to take the head off? Just replace the damn knock sensor...

 

i agree with him .. why do more work if you know what the exact problem is?

 

so vtec usually won't kick in if the knock sensor isn't working unless the p13 is chipped to override that can someone clarify this for me. i'll replace the knock sensor if that doesn't work it could be from inside the motor when i tried to check the oil pressure the gauge didn't rise up at all also when i removed the bolt to check the oil pressure i saw little black particles on the other end of it which is very odd for a motor w/800+ miles.

 

i would suggest changing your oil anyway if its real dirty. usally break in time is 500 miles on new parts, then its new oil time. That should have been one of the first things you did right before/after installation of your new motor. No reason to pull the head. replace your knock sensor first before doing anything else

 

thank you guys for the info i will keep you guys updated after i hook up the knock sensor

 

installed the knock sensor today and still no vtec i guess i will just have to pull the valve cover off does anyone have suggestions as what i should look for

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98TypeSH &raquo;</TD></TR><TR><TD CLASS="quote">i would suggest changing your oil anyway if its real dirty. usally break in time is 500 miles on new parts, then its new oil time. That should have been one of the first things you did right before/after installation of your new motor. : </TD></TR></TABLE>


If you havn't already done what 98typesh said I would do so. And then make sure the oil levels are correct.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by stubh22a4 &raquo;</TD></TR><TR><TD CLASS="quote">installed the knock sensor today and still no vtec i guess i will just have to pull the valve cover off does anyone have suggestions as what i should look for </TD></TR></TABLE>

After you installed it did you get another cel or not?

 

h22a4 is a 5th gen USDM spec motor, which if im not mistaken, run on a p5p ECU. Im not sure running a p13 would work to your advantage, and may cause some problems as the JDM h22a differs slighty than an h22a4

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by staticrex &raquo;</TD></TR><TR><TD CLASS="quote">


If you havn't already done what 98typesh said I would do so. And then make sure the oil levels are correct.

After you installed it did you get another cel or not?</TD></TR></TABLE>

yes i did get a check engine light but it would only come on until i hit 80 mph +. after i turn off the motor and start it up again the cel would go away

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98TypeSH &raquo;</TD></TR><TR><TD CLASS="quote">h22a4 is a 5th gen USDM spec motor, which if im not mistaken, run on a p5p ECU. Im not sure running a p13 would work to your advantage, and may cause some problems as the JDM h22a differs slighty than an h22a4</TD></TR></TABLE>

the h22a4 is a ob2 motor but the guy that did my swap wired it up for obd1 he changed out the dizzy, injectors, ecu and wiring harness