i have a 93 civic lx 5 spd. i ran the cel codes and found codes 21 and 22. how do i go about fixing this issue. thanks

 

Which motor do you have?

21 VTEC spool solenoid valve
22 VTEC pressure valve

 

i have the 1.5l but im pretty sure it isnt vtec.

 

Then the question is what ECU do you have?

 

i was researching... some said to check my oil.. i need to change it. its pretty gone. about 4k miles on it. could that be the culprit?

 

My ecu has a bar code/sticker on it this is the numbers i pulled off it.

37280-p28-a01
760-617819
ARM

ipt

 

If it's not a VTEC, which you really need to verify, then your ECU is looking for VTEC components it doesn't have. As long as it doesn't find them you will have codes thrown. My guess is that if the engine is not VTEC you have the wrong ECU installed.

 

A P28 is a VTEC ECU. Has the engine had a head swapped or is it stock?

 

i bought it from original owner. im pretty sure its stock. i havent done a swap.

 

Let's verify then shall we? What code is stamped on the block? It's obviously not stock if it has a P28 ECU in it.

 

if im correct the code reads pm3-3

 

No. That's the head. It should be on the block in the same location as this.

 

This is a code for a non-VTEC head.

 

ah.. sorry engine is a lil dirty.. it was covered by grease..

D15B7
240 1486

 

For clarity, it's on the left of the block, just below the head. You may have to clean it with some purple power or other grease cutter - if you've never seen it before, they can get coated in grease and road grime.

Gah, beat me to it. Wrong ECU for the motor. The correct ECU is a P06. You can either swap on a vtec head, swap to the correct ECU, or get the ECU chipped and tuned to delete vtec.

 

Yeah. Get a P06 ECU.

 

ok so could this be the reason my car keeps stalling out?

 

it starts up. runs but once i get up to 3-4k rpm neighborhood it fluctuates and bounces then drops and stalls

 

Is it throwing other codes? When was the last time you did a real tuneup on it? Check timing?

 

no other codes. last real tune up approx 6 months ago. 4k miles on oil now.

 

how do i check the timing.. i know quite a bit about my car but not everything.

 

= Frequently asked question.
https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/faqs-frequently-asked-tech-questions-1998336/