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SoCaLef · 10-01-2009, 09:52 PM

alright well i have a 91 hatchback dx and i recently swapped in an obd0 doch zc. i got the engine from hmotors so im thinking its not in too bad of shape. it started up fine but when i applied the throttle about half it sounded like it was at the revlimiter. i dont have an rpm gauge so i cant really say how hi up its going but it sounds like around 3k. ive tried setting timming on it that didnt fix it i changed the fuel filter spark plugs and dizzy cap. none of those fixed the problem but it didnt make it accelerate a bit better. my harness did get pretty hacked up since there where 3 people doing that while i got the engine in so im not too sure on what to focus on. my ecu is showing a solid red light but ive heard different things from ppl saying its good and others that its bad. i did plug it in an 89 crx si and it worked fine so im assuming my ecu is good. any help would be appreciated.

INJEN78 · 10-01-2009, 09:58 PM

the harness is probably junk..i think the solid means that the ecu is dead..but if the harness is hacked then that would probably cause that...try to get the harness figured out

SoCaLef · 10-01-2009, 10:00 PM

alright cool thanks man and would you say just stick with the dx harness thats in there right now and try to fix it or just get another one?

INJEN78 · 10-01-2009, 10:02 PM

id just get new..sounds to me like with 3 ppl going and fucking with things everything is all messed up..

SoCaLef · 10-01-2009, 10:10 PM

yea it did get pretty mest up. alot of the wires or i mean all of them got crimped then once i saw that i solder them but once i looked and the wiring directions i saw that they had put some of them inn the wrong spots cuz they looked at the plugs upside down so i did the best i could but didnt fix a thing except for maybe making it rev up a little faster but not much cuz it still runs like crap. i mean first gear will only let me get up to like 10 mph second is about 25. i think the fastest itll let me go is 65. so its pretty frustrating when the ppl i know are supposibly hard core honda guys and they end up doing that with my car. where would you say the best place to get a harnes? and would you say it would be better to get a complete si instead of another dx harness?

INJEN78 · 10-01-2009, 10:21 PM

the si harness wont match up...go to a junkyard and get an si harness.

SoCaLef · 10-01-2009, 10:39 PM

yea i know from the body harness to the engine harness the plugs are different. alright thanks alot man ill end up picking one up this weekend ill let you know what happens.

INJEN78 · 10-02-2009, 12:15 AM

dont forget you need to do the mpfi swap,,you cant just plug it in..do you know how to do the wiring?

SoCaLef · 10-02-2009, 07:34 PM

im pretty sure but to be on the safe side hows the wiring done

INJEN78 · 10-02-2009, 07:37 PM

theres a mpfi swap in the tech section

safiro21 · 11-04-2009, 07:02 PM

I make that swap 3 weeks ago, check for ground cables, harness need two and the motor need one on the cover valve and follow the mpfi tech
remember change the tps cables.

10-01-2009, 09:52 PM	#1
SoCaLef Greenhorn Join Date: Oct 2009 Location: San Diego Age: 21 Posts: 5 iTrader: 0 / 0% Ride: 1991 Honda Hatchback Rep Power: 0	doch zc problems alright well i have a 91 hatchback dx and i recently swapped in an obd0 doch zc. i got the engine from hmotors so im thinking its not in too bad of shape. it started up fine but when i applied the throttle about half it sounded like it was at the revlimiter. i dont have an rpm gauge so i cant really say how hi up its going but it sounds like around 3k. ive tried setting timming on it that didnt fix it i changed the fuel filter spark plugs and dizzy cap. none of those fixed the problem but it didnt make it accelerate a bit better. my harness did get pretty hacked up since there where 3 people doing that while i got the engine in so im not too sure on what to focus on. my ecu is showing a solid red light but ive heard different things from ppl saying its good and others that its bad. i did plug it in an 89 crx si and it worked fine so im assuming my ecu is good. any help would be appreciated.

10-01-2009, 09:58 PM	#2
INJEN78 ¿GANGSTA GREMLIN? Join Date: Oct 2007 Location: CT(860) VT(802) Age: 21 Posts: 7,738 iTrader: 5 / 100% Ride: 91 CRX si Rep Power: 214	the harness is probably junk..i think the solid means that the ecu is dead..but if the harness is hacked then that would probably cause that...try to get the harness figured out __________________ R.I.P BEN LEE2/24/08 we love and miss you http://burnoutbox.activeboard.com/in...BID=127652&p=1 GOOD FAST CHEAP, you can pick only two. fast and cheap isn't good good and cheap isn't fast good and fast isn't cheap

10-01-2009, 10:02 PM	#4
INJEN78 ¿GANGSTA GREMLIN? Join Date: Oct 2007 Location: CT(860) VT(802) Age: 21 Posts: 7,738 iTrader: 5 / 100% Ride: 91 CRX si Rep Power: 214	id just get new..sounds to me like with 3 ppl going and fucking with things everything is all messed up.. __________________ R.I.P BEN LEE2/24/08 we love and miss you http://burnoutbox.activeboard.com/in...BID=127652&p=1 GOOD FAST CHEAP, you can pick only two. fast and cheap isn't good good and cheap isn't fast good and fast isn't cheap

10-01-2009, 10:21 PM	#6
INJEN78 ¿GANGSTA GREMLIN? Join Date: Oct 2007 Location: CT(860) VT(802) Age: 21 Posts: 7,738 iTrader: 5 / 100% Ride: 91 CRX si Rep Power: 214	the si harness wont match up...go to a junkyard and get an si harness. __________________ R.I.P BEN LEE2/24/08 we love and miss you http://burnoutbox.activeboard.com/in...BID=127652&p=1 GOOD FAST CHEAP, you can pick only two. fast and cheap isn't good good and cheap isn't fast good and fast isn't cheap

10-02-2009, 12:15 AM	#8
INJEN78 ¿GANGSTA GREMLIN? Join Date: Oct 2007 Location: CT(860) VT(802) Age: 21 Posts: 7,738 iTrader: 5 / 100% Ride: 91 CRX si Rep Power: 214	dont forget you need to do the mpfi swap,,you cant just plug it in..do you know how to do the wiring? __________________ R.I.P BEN LEE2/24/08 we love and miss you http://burnoutbox.activeboard.com/in...BID=127652&p=1 GOOD FAST CHEAP, you can pick only two. fast and cheap isn't good good and cheap isn't fast good and fast isn't cheap


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10-01-2009, 10:00 PM	#3
SoCaLef Greenhorn Join Date: Oct 2009 Location: San Diego Age: 21 Posts: 5 iTrader: 0 / 0% Ride: 1991 Honda Hatchback Rep Power: 0	alright cool thanks man and would you say just stick with the dx harness thats in there right now and try to fix it or just get another one?

10-01-2009, 10:10 PM	#5
SoCaLef Greenhorn Join Date: Oct 2009 Location: San Diego Age: 21 Posts: 5 iTrader: 0 / 0% Ride: 1991 Honda Hatchback Rep Power: 0	yea it did get pretty mest up. alot of the wires or i mean all of them got crimped then once i saw that i solder them but once i looked and the wiring directions i saw that they had put some of them inn the wrong spots cuz they looked at the plugs upside down so i did the best i could but didnt fix a thing except for maybe making it rev up a little faster but not much cuz it still runs like crap. i mean first gear will only let me get up to like 10 mph second is about 25. i think the fastest itll let me go is 65. so its pretty frustrating when the ppl i know are supposibly hard core honda guys and they end up doing that with my car. where would you say the best place to get a harnes? and would you say it would be better to get a complete si instead of another dx harness?

10-01-2009, 10:39 PM	#7
SoCaLef Greenhorn Join Date: Oct 2009 Location: San Diego Age: 21 Posts: 5 iTrader: 0 / 0% Ride: 1991 Honda Hatchback Rep Power: 0	yea i know from the body harness to the engine harness the plugs are different. alright thanks alot man ill end up picking one up this weekend ill let you know what happens.

10-02-2009, 07:34 PM	#9
SoCaLef Greenhorn Join Date: Oct 2009 Location: San Diego Age: 21 Posts: 5 iTrader: 0 / 0% Ride: 1991 Honda Hatchback Rep Power: 0	im pretty sure but to be on the safe side hows the wiring done

10-02-2009, 07:37 PM	#10
INJEN78 ¿GANGSTA GREMLIN? Join Date: Oct 2007 Location: CT(860) VT(802) Age: 21 Posts: 7,738 iTrader: 5 / 100% Ride: 91 CRX si Rep Power: 214	theres a mpfi swap in the tech section __________________ R.I.P BEN LEE2/24/08 we love and miss you http://burnoutbox.activeboard.com/in...BID=127652&p=1 GOOD FAST CHEAP, you can pick only two. fast and cheap isn't good good and cheap isn't fast good and fast isn't cheap

11-04-2009, 07:02 PM	#11
safiro21 Greenhorn Join Date: Sep 2009 Age: 28 Posts: 10 iTrader: 0 / 0% Rep Power: 0	I make that swap 3 weeks ago, check for ground cables, harness need two and the motor need one on the cover valve and follow the mpfi tech remember change the tps cables.

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