i have a 93 Si with the stock D series.. when i hit vtec (the kind that you cant feel but they say you have) right at 5500 rpm my speedo starts to go crazy.. jumping well into the 110mph part.. then itll go dead and rest at 0mph.. if i hit vtec again itll jump around and maybe catch then itll be fine if i stay outta vtec.. right now it completely doesnt work..

maybe a bad speed sensor?... speedo cable?.. cluster?.. but why when i hit 5500rpm?

 

i dont know but vtec is at like 4800-5000 rpms

 

okay.. mybad.. i stand corrected.. but still why is the speedo not working?.. i was thinking my speed sensor was getting bad and not its broken.. but then the question still remains; why only at high rpm did it start to act funny?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by northkai3 &raquo;</TD></TR><TR><TD CLASS="quote">i dont know but vtec is at like 4800-5000 rpms</TD></TR></TABLE>

Umm, no, not on a P28.

Interesting problem though, bookmarked

 

yea this happened to me too on a cx with a R motor vtec stoped working and i changed the speed senor twice too no luck im using a P30 ecu btw

 

Try replacing the wiring harness that connects to the speed sensor, that happened to me on my GSR, and it worked fine after that. Funny thing is now I put my GSR motor into my hatch and the speedo is jumping again, lol. Oh and I'm running a p28 in my gsr hatch and vtec engages at 5k...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93CX &raquo;</TD></TR><TR><TD CLASS="quote">

Umm, no, not on a P28.

Interesting problem though, bookmarked</TD></TR></TABLE>
ok well seeing as i own a jdm d15b with a stock p28 go ahead and tell me when vtec kicks in

 

I had the same problem and it was the speed sensor. Try that if it doesnt work then look at the connector.

 

This is happening to me right now. Anything else it could be?

 

sounds like a ground problem. check all your grounds, espcially by the thermostat housing. make sure the vtec spool valve is also grounded.

 

OK, I'll check that. Right now the wire is just wrapped around the thermostat housing ground bolt (same one as the thermostat housing ground). I will also check for the corrosion or bad connection/contact with the VSS sensor and plug. I really hope its one of these 2 things. Thanks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by northkai3 &raquo;</TD></TR><TR><TD CLASS="quote">
ok well seeing as i own a jdm d15b with a stock p28 go ahead and tell me when vtec kicks in </TD></TR></TABLE>

It kicks in at 5500rpm

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by northkai3 &raquo;</TD></TR><TR><TD CLASS="quote">ok well seeing as i own a jdm d15b with a stock p28 go ahead and tell me when vtec kicks in </TD></TR></TABLE>

Yea, never seen a stock p28 kick in at 4800...

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by md420 &raquo;</TD></TR><TR><TD CLASS="quote">It kicks in at 5500rpm </TD></TR></TABLE>

 

your problem is you just have a fast *** car

 

well i took out my cluster to see if it was the connections.. but nope thats not the problem.. im gonna swap the VSS soon and maybe the plug too..

 

I fixed my problem by cleaning the contacts on the VSS plug.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wrecks &raquo;</TD></TR><TR><TD CLASS="quote">i have a 93 Si with the stock D series.. when i hit vtec (the kind that you cant feel but they say you have) right at 5500 rpm my speedo starts to go crazy.. jumping well into the 110mph part.. then itll go dead and rest at 0mph.. if i hit vtec again itll jump around and maybe catch then itll be fine if i stay outta vtec.. right now it completely doesnt work..

maybe a bad speed sensor?... speedo cable?.. cluster?.. but why when i hit 5500rpm?</TD></TR></TABLE>

nah your car just has a honda wonder motor... your so busy looking at the speedo wondering how your goin that fast, you dont realize everything around you is flying fast you... lmao jj