Code 4
 

Guys help, 92 civic sedan with a d15b vtec, runinng P28 ecu... would this code also cause the idle to jump up n down??

Re: Code 4
 

code 4:
If the bus goes over 50mph and then reduces speed under 50mph it will explode.
Make sure u jump the bridge :y

Re: Code 4
 

i thought 4 was danger to manifold
keep an eye on your floor board

Re: Code 4
 

if your referring to error code its your crank position sensor

Re: Code 4
 

it _shouldn't_, it's used for cranking purposes only.

check your IACV and FITV if you have one.

Re: Code 4
 

come-on guys please help me out, you guys knew what I met. whats best way of solving this problem??

Re: Code 4
 

two people tried. probably your iacv.

Re: Code 4
 

http://www.we-todd-did-racing.com/we...MxeTU0MQ%3D%3D
http://www.we-todd-did-racing.com/we...MxeTU0MQ%3D%3D

Heres the manual for trouble shooting, (this is obd0) but its pretty much still the same. 90% of the time when I have a code 4/8/9 I usually end up replacing the distributor. I always suggest clearing the code first, and making sure all the pins for the distributor connector are nice and tight.

Will this cause idle problems? ehh, I dont think so. I'd fix the check engine light first then start trouble shooting your idle problem. Its possible the fit valve needs to be adjusted or your having a iacv going out.

Jeff