My friend has a 90 4dr civic that recently had a 1st gen b16 swapped in. a friend of his wired it up; the mpfi swap first, then wiring up vtec, knock sensor and yadda, yadda, yadda. Anyway, when he floors it, the rev limiter kicks in at 6k rpm. if he half throttles, he could make it to 7500 or so rpm. there are no engine codes and everything is hooked up, incl. the speed sensor cable. i'm pretty sure its a wiring problem but don't know what to check first. visually, the wires look fine and all soldered up.

do you guys have any idea what might be causing this. i tried to do a search and couldn't find anything. that, or i could just be a moron.

any help would be appreciated.

 

anyone?

 

There must be a cel, make sure you are checking properly.

If infact there are NO CEL's, then youve got some troubleshooing to do.

 

yep. there isn't any right now. the first time we started it up, it had one code which was TPS. We changed that and now all is good but still, the rev limiter problem...

 

does the speedomoeter work?

 

speedometer works and so does vtec.

 

One possibility is that you have an ECU for an automatic.
It happened to my friend..

My ecu said MT=manual and his said AT=auto
look for the red circle around the middle of pic...

 

we tried the ecu in my car and it works fine tho... (got a B16 too)

 

Bad ecu?? Try putting YOUR ecu in his car....see if it helps!!

 

Is the motor cold when he does this? my rev limiter kicks in at 7k when my engine is cold

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blumpfish &raquo;</TD></TR><TR><TD CLASS="quote">Is the motor cold when he does this? my rev limiter kicks in at 7k when my engine is cold </TD></TR></TABLE>why u reving to 7k on a cold motor?...stop doing that

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91crxturbo &raquo;</TD></TR><TR><TD CLASS="quote">Bad ecu?? Try putting YOUR ecu in his car....see if it helps!!</TD></TR></TABLE>
Tried that today and is still doing the same thing.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blumpfish &raquo;</TD></TR><TR><TD CLASS="quote">Is the motor cold when he does this? my rev limiter kicks in at 7k when my engine is cold </TD></TR></TABLE>
No, it's not cold. But, I don't think temperature should have any effect on where ur rev limiter kicks in... u should get that checked.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Suck my DX &raquo;</TD></TR><TR><TD CLASS="quote">why u reving to 7k on a cold motor?...stop doing that</TD></TR></TABLE>

 

any other ideas guys?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by reynardmauricio &raquo;</TD></TR><TR><TD CLASS="quote">any other ideas guys?</TD></TR></TABLE> did you open the ecu to see if it was chipped already ? some chips take so many cel's off.. so check that out first in order to get some CELS :D

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by reynardmauricio &raquo;</TD></TR><TR><TD CLASS="quote">No, it's not cold. But, I don't think temperature should have any effect on where ur rev limiter kicks in... u should get that checked. </TD></TR></TABLE> To prolong the life of an engine, certain actions are taken by the original OEM programmers to stop jack-***-ery and such.

I.E, lower redline when cold since parts haven't reached something called OPERATING TEMPERATURE yet.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dr_latino999 &raquo;</TD></TR><TR><TD CLASS="quote"> To prolong the life of an engine, certain actions are taken by the original OEM programmers to stop jack-***-ery and such.

I.E, lower redline when cold since parts haven't reached something called OPERATING TEMPERATURE yet.</TD></TR></TABLE>

well... what I mean is that once a certain map is written to the ecu, it shouldn't change regardless of temperature. I dunno, maybe i'm wrong. u would think that OEM programmers would take temperature into consideration... at least to a certain point. even on a warm day, i let my car run for at least a min before i drive it, but that's just me.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Metal Typhoon &raquo;</TD></TR><TR><TD CLASS="quote"> did you open the ecu to see if it was chipped already ? some chips take so many cel's off.. so check that out first in order to get some CELS :D</TD></TR></TABLE>

will check tonight, but the ecu seems to run fine in my car.

 

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

well... what I mean is that once a certain map is written to the ecu, it shouldn't change regardless of temperature. I dunno, maybe i'm wrong. </TD></TR></TABLE> Easiest way to put it is that there is parameters A and parameters B. Set A stays in place until the ECU sees the coolant temperature rise past xxx. Once xxx degrees is hit then it switches over to B, where you normally drive around and operate the motor.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dr_latino999 &raquo;</TD></TR><TR><TD CLASS="quote"> Easiest way to put it is that there is parameters A and parameters B. Set A stays in place until the ECU sees the coolant temperature rise past xxx. Once xxx degrees is hit then it switches over to B, where you normally drive around and operate the motor.</TD></TR></TABLE>

You learn something new everyday. Thanx.

 

I opened the ecu last night, and it isn't chipped. Any other ideas?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Suck my DX &raquo;</TD></TR><TR><TD CLASS="quote">why u reving to 7k on a cold motor?...stop doing that</TD></TR></TABLE>
i've done it prolly twice.. definately not a good idea