OK. so i built a H23 bottom with a h22 vtec head. This is all thats done to the engine. Balance eliminator shaft kit. egr block. valves, type R springs and retainers. exhaust and intake. ect...

Its a well built and runs strong. I at first ran it with a H23(p14) ecu. non vtech. ran good for awhile. Ordered a chip p28. so i can get vtech. never ran good on that ecu. bogged down and intake pop. Spuddered when throttled up at lower end of rpm then rev normal at higher rpm. bought a p14(h22 vtech) ecu. ran alil better. but same issues. I checked the harness and had to fix acouple wires.

replace fuel pump, fuel pressure reg. map senor. main rely. tried different injectors. spark plug and wire. distributor.

It now idles and revs good. alil hesitation when throttled up. has idle problem. I checked the timing marks on the cams and are good. and off flywheel which are good. almost seems like a vaccum leak of some sort thats not letting it idle.

Put it in gear and drive alil, it falls on its face. rev up and rpms drop and almost want to die.

Not sure what it can be now. kinda stumped. would love to hear some ideas and advice. thanks

 

How long did you run it on the P14?

Have you done a compression test on it?

What kind of bearing clearances etc?

 

Is the ecu chipped and tuned or jsut chipped and you are trying to run it untuned?

 

snobordboy- It ran for about a month as a daily driver. Had no probs at all till one day it started is randomly fall on its face and die. wait alil.. started right up. since then I havent had it back on the road. Just been trying to get it running good. Idles and all but seems as soon as i put it in gear, falls on its face. Ill try to get a vid up on it. tried 440 injectors too. starts up and idles when cool and revs as normal but when it idles down, runs like poop. compression is good. im pushing 12:1. and bearing clearness is stock clearness.

Boucjaroo- The p28 has like 2 step, flatfoot. and base map h22. also the fuel % increase when vtec hits. but not across the board. P13 and p28 acts the same. I have yet to tune it besides what done to the p28.. Seems like it wouldnt need much of a tune when theres not much done to the engine. But confuses me how the p14 ecu will tun great but the other 2 run like poop.

Thanks guys for the talk and help. greatly appreciated. Let me know if i can answer anything else.

 

A base map needs to be tuned. The p14 you were using its fine to start up test but it its designed for s 2.3, with smaller injector so its a long way from ideal


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If it ran ok for awhile, then started acting up all of a sudden, something physical changed. One question first, is there a cat on the system, and has it been checked? If no cat I would do these things in order:

Double check camshaft and crank timing to TDC.

Check igniton timing.

Check/ replace spark plugs.

Do a compression test.

Do a leakdown test.

Get a proper tuneable ecu and get a "good" tuner to tune it properly, but this is assuming that no problems are found and it can be safely and reliably tuned.

 

sounds like this motor is toast.
You ran multiple ECU's that are not designed for this motor.
You needed to get a chipped p28, tow it to a tuner and have it tuned.
Otherwise your afr has probably been way off for the past month and that's when things just suddenly stop working.
It's like all the people that buy a ebay turbo kit and slap it on a stock ecu and it ran good for a couple months and blew up.

Check your plugs to see how they are and do a compression test.
Probably needs to be re ringed.

 

Nothing's wrong with the engine. Compression is 13:1. I'm starting to think its ignition. I don't believe this car should be tuned. There's nothing done to the engine to say it needs a tune. I have a chipped p28 already. The seller effed up on it and won't email me back so ill have someone else fix it. It runs and idles and revs just fine... But when u put it in gear and drive.. Falls on it's face. But it will sit all night and u can rev it instead.. Something about it being unload changes things.

 

Sounds like when you put load on the motor and apply fuel, that you lose fuel and it starves the motor and then dies.

That leads me to think, Fuel pump, main fuel relay, and or iginition.

I just thought of another possibility, you might have a vaccum leak, when you apply throttle and there is a vaccum leak it will stall a motor.

 

It could be fuel related, I had some issues on my Subaru when the old pump was failing. Ran fine until heavy load, then would mis-fire.

I still think you should do an actual compression test, it take 20 minutes max, and will make sure the motor is truely healthy.

The reason I suggest this is that my first H23VTEC build, I broke the ringlands on one piston, and the engine was "running fine" The only reason I even checked compression, is that I was down on power at the track a noticable amount.

And you say not much has been done to this motor, yet you have said both 12:1 and 13:1 for compression, yet the stock ecu map is for 10.6:1 or so, so right there you need some tuning for it to run safely, so it is still advisable to get the car on a dyno and tuned right, plus it will allow you to make the best power possible on the setup.

 

OP doesn't even know what he's talking about.
Says his compression is fine at 13:1 with a p14 ecu. LOL
Now he's running a p14 with vtec? Wtf.
I think it's a troll.

 

Have fun with that 13:1 on pump gas