powerfox66

Ok, I am new to forum and to hondas..a good friend had his h23a1 pulled and installed a h22a. the guy that did it cant get it to start.
What I do know is this..they swapped oil pump and put a new crank/tdc sensors in front of motor...they got spark, will start and run if spray in throttle body. noid lite test injectors very intermittent flashing. so it seems to me we got spark and timing is ok..

powerfox66

What sensors does ecm need to see for injectors?? 2001 prelude.. very intermittent injector pulse when using a noid lite...original harness, distributor, external coil, oil pump & a new tdc sensor from advance auto...they used injectors and intake from new motor, and motor did not have a ecu with it, so original ecu as well..viper alarm removed, and added 2 additional grounds from battery to engine & 2 more from engine to body

also checked grounds at ecu, and grounded ecu itself as well.. injectors measured 11.2 ohms from what i have read is high impedance injectors which should be used on the original 01 lude??

the ecu for the car...he did not get an ecu with new motor

The ECU that came with the car is a p5p so if i understand correctly, that ecu should also work with new motor??

powerfox66

what about a cam or crank sensor?? when i used the scan tool if i remember correctly i did not see any rpm cranking

powerfox66

injectors only flash very intermittently

turbohatch96y7

iTrader: (15)

Well for a motor to start u need fuel compression timing spark do you have all those?

typemismatch

01 lude had an H23?

Something fishy there ...

powerfox66

just found out had a h23a1 put in by previous owner just before selling the car other motor was blown up.. i think had h22 before?? said he was getting 23 to tach up to 9000 prob why he blew this one up

also is it possible that when they swapped over the oil pump and installed a new crank/tdc sensor that the could have it wrong other than cam/crank timing belt alignment??

minilogoguy18

What injectors are you using?

mike541

Uhm, yea something is def fishy. Are you sure it wasn't an H23a Vtec motor?? Haven't heard of any H23a1's revving to 9K. A 2001 Prelude is OBDII. They don't come with an H23a1. Is the new H22a OBDI or OBDII? On OBDI the CKP and CMP are in the distributor. I do believe on the OBDII models it's in/on oil pump... What ecu do you have?

minilogoguy18

^There is an OBD2 H23a1, came in the 96 4g. The OP isn't giving enough info.

mherkamp

^^very true, however injector type could be an issue. If u are trying to use peak/hold injectors without resistor box or vice versa, it probably won't run. Is the 96 OBDII H23a1 peak/hold or saturated from the factory? Also, make sure you're getting fuel to the fuel rail.
GL
Mike

v4lu3s

afaik the 96 still used peak and hold injectors.

mike541

95/96 is the first years OBDII compliance had to be changed... not everything was changed in those years. Some cars just had a dummy OBDII plug but still had OBDI diagnostics. I've never heard of anyone wanting to put an SI motor in a 5th gen... not saying it hasn't been done just dont know why someone would?

mherkamp

As far as the Prelude is concerned, the 96 OBDII H23a1 does have the OBDII computer and, I would assume, the associated sensor hardware. But back to the point of the post, fuel rail should build pressure regardless of engine running. Can you hear the fuel pump run if you turn the key to 'on' and not to 'start'?

powerfox66

First thanks greatly for the help I am getting..I will give all info as I am made aware.
the old motor(h23a1) that came out hand grenaded, was taching to 9k, was a vtec/red, was NOT original motor, had ext coil and tdc/ckp sensor@front of motor no resistor block that I know of. new(used) motor(h22a) vtec/blue, they swapped old oil pump, installed new ckp/tdc sensor(advance auto), swapped old distributor & ext coil--left the intake, tb & injectors(11.2 Ohms/high impedance) on new engine--using ecu that came with car, P5P, ecu harness had been spliced into and had a viper alarm--I removed alarm, and fixed the wires. yes fuel pump does run, pulled plugs they are black & smell of fuel--when cranking it will stumble and try to start, but only for a second, and my scan tool does not show any rpm while cranking. during one extended crank I got an engine lite & code p0335-don't know if I created code messing with it trying to start--I will verify spark, fuel to rail & test ckp/tdc sensors tomorrow with tests off alldata.

minilogoguy18

Advance auto sensors=fail

Sounds like the plugs are all fouled out and you can't get a decent spark. When you swapped oil pumps did you also swap the ring for the crank sensor and lower timing gear over? You need those too.

powerfox66

I was not involved with any of the actual swap..I am told that they did change all that over tho I am not 100%... I would have gone with factory part for something this critical that is that much work to install, but some people only consider $$

xero_xero

i would say drop the h23a1 in and cyk bypass for obd2 motors.

thats the only way i could see it maintaining proper running order. otherwise i have seen 97-01 ludes with f22/f23

powerfox66

can the crank/tdc sensor be tested with an ohm meter?

powerfox66

mherkamp

Ok, h23a1 is not a vtec motor, and should have had a black valve cover from the factory. Also the oil fill is on the driver's side, and does not say vtec on valve cover. Red valve cover with vtec is h22a1 or a4? 5th gen guys please chime in. Blue valve cover is h23a, which IS a vtec motor, but not OBDII. Says vtec on it. These colors are all assuming no one painted them a different color. I think the problem may lay in the crank tdc sensor/distributor/ecm combo. Someone with swap exp. please chime in!

powerfox66

thanks^^^^ I think I do have a bad crank/tdc sensor, I believe there should be some resistance measuring between both terminals thru the sensor(I am showing open on both),pin 1(green) to pin 2(red) for tdc & pin 3(blue) to pin 4(white) for crank. but due to my lack of experience with imports I am not sure. as stated above someone else put in a brand new(advance auto) ckp/tdc sensor