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#1
06-21-2003, 10:23 PM
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help, where did my power go this time.
ok i posted a while back asking about asking about difference between std and dx and now i'm discovering that i either have a bad engine or a bad cat back i get a loud puffing sound when i hit around 15 or 20mph in first gear and my power drops, that and it only gets worse the more i drive in a day got so bad once it took me 20 secconds to get to 30mph. please help should i return the jdm engine or could it have something to do w/ the conversion to dpfi from carberated.
hope you guys can help. please help help help.
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I'm no street racer nor do want to be, my goal is a fun car... that leaves SUVs in the dust. current car: red 90-civic-STD-hb with dx trannie, ecu, shift knob, & rear seats. i hate my vynil seats. p.s. i am once again with computer, please forgive the one year leave of absence. 
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#2
06-22-2003, 10:48 AM
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Check your distributor? Sounds like you can't rev it high. It could mean a clogged cat. Check all your wirings on the dpfi to mpfi conversion. Check your timing also. Do you have a check engine light? If you do, check what codes its throwing.
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#3
06-22-2003, 11:30 AM
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no check engine light and still have dpfi, clogged cat. sounds like it might be it i'm gonna take it back to the shop that dropped the engine in monday.
__________________
I'm no street racer nor do want to be, my goal is a fun car... that leaves SUVs in the dust. current car: red 90-civic-STD-hb with dx trannie, ecu, shift knob, & rear seats. i hate my vynil seats. p.s. i am once again with computer, please forgive the one year leave of absence.
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#4
06-22-2003, 02:44 PM
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well if you're cat is clogged pull it off get a big screw driver and hammer and have at it, while you save for a high flow cat...
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90- crx si w/ a D16a Vtec and a few goodies, oh and 60k miles on it heh
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#5
06-23-2003, 01:58 PM
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I REALLY don't mean to be rude, but if the person told you it was a JDM fuel injected motor from a 4th gen Civic then they lied to you. Only the ZC and B16A were Fi, the other D15 engines ran ECU controlled twin-carbs and put out up to 100ps. Now if someone has bolted on Fi, then yes, you will have issues (unless I've missed a motor designation somewhere - possible as I've just finished an 800km drive). Take the motor back and tell them to stop dicking you about with BS motors.
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#6
06-23-2003, 03:24 PM
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yes
yes i know i got the carberated version my repair shop did the conversion to dpfi, and now i'm having problems out the ass. well i though it was my cat was bad but the muffler shop just told me that my engine needs a big tune up. i'm gonna try cleaning the fuel injectors and giving it a tune up next. if that doesn't work than i'm gonna start shooting people.
 and if that doesn't work i'm gonna strap on a vtec head, can i do that before switching to mpfi? i know it's better but can i?
__________________
I'm no street racer nor do want to be, my goal is a fun car... that leaves SUVs in the dust. current car: red 90-civic-STD-hb with dx trannie, ecu, shift knob, & rear seats. i hate my vynil seats. p.s. i am once again with computer, please forgive the one year leave of absence.
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#7
06-23-2003, 03:29 PM
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I've found out, and posted in another thread, the catalytic converter very very rarely clogs. I drove my car for months with it smoking like it was on fire, and i know the previous owner did so as well. I took the cat off about 3 days ago to replace it with an integra one (b18a swap, the flanges are differently angled).. it looked brand new inside.
I would think that a car that smokes like crazy would clog up the cat if anything, but it didnt. a "clogged cat" rarely happens anymore, maybe in the old school days of the "marble style" cats, but with the newer style, they rarely clog.
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#8
06-23-2003, 06:31 PM
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I added a few mods and lost power too
added an OBX intake manifold(much larger than original) and a gsr throttle body with a msd igniton and lost 1 full second in the 1/4 mile. Maybe time for me to upgrade the ECU?
P.S. set the fuel regulator to 45psi
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#10
06-24-2003, 01:13 AM
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Re: yes
Quote:
I dunno about swapping on a DOHC VTEC head - they are B series motors, not D and you will need all the VTEC ancilleries to actually get it to work. Yes you will need the MPFi. Take it back and tell them to fix it - seems like a cock-up from day one to me 
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#12
06-24-2003, 02:06 AM
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Hey, if I paid good money for a turn-key transplant that didn't work, I wouldn't be sitting at the keyboard - I'd be demanding that they fixed their dodgy work.
 
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