Contender_h22a

Hi guys.
I own a 94 honda prelude h22a and I just recently swapped it.
I put a stock p13 in and it redlines at 6500 no vtec.
After that I put a p28 and it redlines at 7500 no vtec.
The check engine light is on and I was wondering if y'all know anything about this?
I really need major help because vtec is not engaging and when I hit 4000 rpm the car began to be very loud.
Any help thanks.

Apex1972

take it somewhere that actually knows about Hondas. its too hard to get these kinds of issues worked out on the web. You may check on the VTEC solenoid,VTEC pressure switch,temp sending unit.You need to first find out what code your P13 is throwing.if you can't find your connector for the check engine light ,please stop now.

NirVTEC

Is your car warmed up when you're trying this?
That sounds mysteriously like a COLD VTEC i.e. 6500rpm limit with no VTEC

313hitman

oil level/pressure is also important. vtec requires numerous signals to function. like above check the p13 it may provide important clues. the cel plug is behing the radio cluster. its blue and hard to miss

Contender_h22a

Yeah, I want to take it to the shop, but I dont know which one. I am searching for some that REALLY i mean REALLY knows about Prelude and H series.

Contender_h22a

I tried it when it was warmed up. Looks powerful as it is, but when I drove my friend's h22a, it was a whole lot different from mines.

Contender_h22a

I dont really know about ECUs. I can take a picture of it will that help?
And is that wire you're talking about small?

313hitman

pull your radio/bezel assembly out and its on the bottom left held on by a plastic screw that you can rip off. the plug is blue you cant miss it.

thisiskev

you said you swapped it? what motor was in the car before the h22a? is vtec even wired up?

Contender_h22a

The original motor is an h23a non vtec.
From what I see, the firewall have this vtec plug that isnt plug to anything.
So, I decide to plug it to vtec with a oil line from vtec to the blue wire from a
harness that is kind of a sky blueish.

Contender_h22a

What do I do with the wire?

Yuyodrift91

This.

https://honda-tech.com/forums/honda-prelude-4/how-retrieve-cel-atts-abs-4ws-dtcs-2553408/

Contender_h22a

Thanks, I'll try this when I get home.

Apex1972

this is NOT going to end well.

Contender_h22a

okay so I did what all of you are saying and the
CEL blinks 5 times. So, what's the problem?

313hitman

just 5 fast blinks? I thinks thats map sensor..

Apex1972

is it 5 fast blinks or 2 slow 3 fast? might be code 23? knock sensor does not disable vtec though ,does it? good luck sir.

Contender_h22a

Yeah, just 5 fast blink.
The map sensor is on the throttle body right?
Yeah, there wasnt a plug there and someone said that
it is in the back of the motor already. So do i need to connect it?

Contender_h22a

It is just 5 fast blink.

Contender_h22a

Anymore ideas?
Vtec still doesnt engage.
I am planning to SC it after it works.

Contender_h22a

What are these rims called?
I am looking forward to buying it.

Pullig

those are from the 95 prelude Special Edition i have these and i love them

kerry400f

That's where the map sensor was on my H22a. I just used my TB off of my H23 because you also have a map sensor on your firewall. So, basically you have two map senosrs right now.

Also, you may have too hard wire in the vtec oil pressure switch as some H22a's do not come with them. That's what I did until my pressure switch comes.

Contender_h22a

Thanks, I just didnt know the name of it.
I'll post up some pictures after I get the rims.

Contender_h22a

What is too hard wire? The firewall by the passenger has a plug that fits right up to the vtec solenoid and I just decided to connect it. There was no oil pressure wire so I decided to connect it to the plug and the sky blue wire. I'll take picture because I dont think I am explaining it right.