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5th Gen - Red Top motor - Question

 
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Old 08-23-2010, 10:26 PM
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5th Gen - Red Top motor - Question

1998 SH bought used. Runs great but constant p0301, p0303, p0304, p0302, & p0300 codes. Can't seem correct .. H22A red top motor. I've been told that red top and standard ECU that I will not be able to get rid of the random misfire. Is this true ? Any suggestions ?
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Old 08-23-2010, 10:30 PM
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Re: 5th Gen - Red Top motor - Question

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Originally Posted by bbobbyb View Post
1998 SH bought used. Runs great but constant p0301, p0303, p0304, p0302, & p0300 codes. Can't seem correct .. H22A red top motor. I've been told that red top and standard ECU that I will not be able to get rid of the random misfire. Is this true ? Any suggestions ?
this is not true . ive done the swap and used the usdm ecu with no issues at all . something is done wrong . dose the car run really rough ????
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Old 08-24-2010, 06:01 AM
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Re: 5th Gen - Red Top motor - Question

Thank you for your response.. No the car seems to run very smooth, no loss of power.. Distributor and ignition coil are NOT for this car. Found that our the hard way. Seems to be from a 1998 Civic. Thought about trying to changing out the components to get closer to the correct parts. Have spent way too much trying to get the vehicle to pass emissions test, hate to abandon. I do not think the swap out was done 100% correct since there are hacked up wiring harnesses, vacuum lines wrong etc.. Thank you in advance for any advice you can give
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Old 08-24-2010, 02:02 PM
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Re: 5th Gen - Red Top motor - Question

Thats out of my legue, not into the swapping thing. Nothing but trouble in my opinion.
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Old 08-25-2010, 09:53 AM
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Re: 5th Gen - Red Top motor - Question

I have a similar swap except mine is a h22a black top... It throws me just one cel.... And atts light is on too... But have you tried a different computer? U should try it won't hurt... It might work
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Old 08-25-2010, 11:19 AM
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Re: 5th Gen - Red Top motor - Question

The red tops run a slightly higher comp ratio and more aggressive cams than the black top USDM H22. That may be your problem. I would try getting ahold of either an ECU for that motor or a P28 with a red top basemap.

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Thats out of my legue, not into the swapping thing. Nothing but trouble in my opinion.
It's only trouble if you do a terrible job and don't take your time to work all of the small details out.
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Old 08-26-2010, 09:23 AM
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Re: 5th Gen - Red Top motor - Question

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Originally Posted by 1BadBB6 View Post
The red tops run a slightly higher comp ratio and more aggressive cams than the black top USDM H22. That may be your problem. I would try getting ahold of either an ECU for that motor or a P28 with a red top basemap.



It's only trouble if you do a terrible job and don't take your time to work all of the small details out.
Thats sounds like a plan to me, but are there other components that might need replacing?

yeah I do think the red tops run like 11:1 or maybe even 11.5:1 but are they OBDI? then if that is so I guess you would have to switch everything out that is OBDII dependant.
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Old 08-26-2010, 11:07 AM
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Re: 5th Gen - Red Top motor - Question

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Originally Posted by Rob View Post
Thats sounds like a plan to me, but are there other components that might need replacing?

yeah I do think the red tops run like 11:1 or maybe even 11.5:1 but are they OBDI? then if that is so I guess you would have to switch everything out that is OBDII dependant.

If it is a true Type S Red Top then it is OBDII and 11:1. He can easily get an OBD II to I jumper harness and hook the p28 up with the basemap made for that motor. Or a p72 so he doesn't lose control of the IAB's.

I would try the ECU first, especially since he claims that it runs smoothly. The fuel and ignition timing is probably just a little bit off.
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Old 08-26-2010, 02:39 PM
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Re: 5th Gen - Red Top motor - Question

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Originally Posted by 1BadBB6 View Post
If it is a true Type S Red Top then it is OBDII and 11:1. He can easily get an OBD II to I jumper harness and hook the p28 up with the basemap made for that motor. Or a p72 so he doesn't lose control of the IAB's.

I would try the ECU first, especially since he claims that it runs smoothly. The fuel and ignition timing is probably just a little bit off.
so switching to the OBD I with the jumper harness switches it from OBD II then you still have components that respond to the OBD II (or might throw CEL s), is there a way just to get something and tune the OBD II ECU?

Sorry I'm still researching these swaps and compatiblity issues
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Old 08-26-2010, 02:44 PM
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Re: 5th Gen - Red Top motor - Question

i don't think you will retain all components but I know you should most of them.

you can use a piggyback like an AFC NEO to tune an OBDII but it doesnt have near as much capability as the OBDI plus tuning software option.
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Old 08-26-2010, 02:46 PM
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Re: 5th Gen - Red Top motor - Question

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Originally Posted by 1BadBB6 View Post
i don't think you will retain all components but I know you should most of them.

you can use a piggyback like an AFC NEO to tune an OBDII but it doesnt have near as much capability as the OBDI plus tuning software option.
Is that mainly because the OBDII ECU s are a learning type ECU (making changes on the fly)?
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Old 08-26-2010, 02:52 PM
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Re: 5th Gen - Red Top motor - Question

Now if this is so, then I guess you will always have to have your swapped motors w/ piggy backed OBD I P28 or P72 ECU s you will always or periodically retune (say if something is not running at optimum level) that also means keeping on top of your regular maintenance and even more if you have a built car.
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Old 08-27-2010, 08:02 AM
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Re: 5th Gen - Red Top motor - Question

If you use a P28 wont you loose ATTS functionality?
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Old 08-27-2010, 09:03 AM
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Re: 5th Gen - Red Top motor - Question

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If you use a P28 wont you loose ATTS functionality?
Only you SH owners,,,
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Old 09-06-2010, 08:30 PM
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Re: 5th Gen - Red Top motor - Question

thanks for the responses.. Been off line for a while
ECU is a 37820-5P5-L03.. which is the ECU for an H22A, based upon what I read on the fourm.
I have figured out the previous owner used a Honda Civic distributor and coil (all in one) to make the car run. I plan to convert back to the correct coil for the Prelude.
Since this "project car" was picked up midstream; I'm not sure what else I'll run into.
Any suggestions are welcome.
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