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97 civic dx hatch with ls/vtec swap runs like crap -- bad ecu?

Old 06-25-2012, 01:19 PM
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Default 97 civic dx hatch with ls/vtec swap runs like crap -- bad ecu?

Its an ek with a ls/vtec, i cannot get this pig to run right at all. Every sensor reads 1 volt low
ect-3.5
map-4
tps-.49 idle/4.2 wide open

my car never goes into injector cut and will idle around 12 to 13 air/fuel( i have a wideband)its slow as all can be, the stock d series felt faster.
big piece, i have spent so much money and have tried everything.
Its tuned on chrome using a p28 ecu, its tuned for stock injectors but in order to make the proper fuel i have to run 310 injectors, i have a tune for 310 injectors and it runs way to lean

any one have ideas?

Last edited by Former User; 06-26-2012 at 06:51 AM.
Old 06-25-2012, 01:23 PM
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Default Re: weird TPS ECT sensor voltage drop causing issues

i got a huge list of upgrades- dyno made 130 whp, so depressing
gsr head
s2 valves/springs/retainers
blox intake manifold
s2 70mm throttle body
310 rc injectors
adjustable cam gears
b18a1 block
12.1 comp forged pistons
arp rod studs
p28 ecu
type r lsd
Old 06-25-2012, 01:23 PM
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Default Re: weird TPS ECT sensor voltage drop causing issues

Originally Posted by bscotti
my car is very similar. Its an ek with a ls/vtec, i cannot get this pig to run right at all. Every sensor reads 1 volt low
ect-3.5
map-4
tps-.49 idle/4.2 wide open

my car never goes into injector cut and will idle around 12 to 13 air/fuel( i have a wideband)its slow as all can be, the stock d series felt faster.
big piece, i have spent so much money and have tried everything.
Its tuned on chrome using a p28 ecu, its tuned for stock injectors but in order to make the proper fuel i have to run 310 injectors, i have a tune for 310 injectors and it runs way to lean

any one have ideas?
Get a better tune.
Old 06-25-2012, 02:12 PM
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Default Re: weird TPS ECT sensor voltage drop causing issues

i have tried several
Old 06-25-2012, 09:18 PM
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Default Re: weird TPS ECT sensor voltage drop causing issues

Originally Posted by bscotti
i have tried several
And that tells us that you haven't taken the car to a tuner to have it professionally tuned. That's what Grumble means. Do it.
Old 06-26-2012, 02:41 AM
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Default Re: weird TPS ECT sensor voltage drop causing issues

Originally Posted by bscotti
i have tried several
I'm not talking about Ebay basemaps.
Originally Posted by bscotti
its tuned for stock injectors but in order to make the proper fuel i have to run 310 injectors, i have a tune for 310 injectors and it runs way to lean
I've never heard of such nonsense. There is no way a tuner would have you running like this.
Old 06-26-2012, 04:35 AM
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Default Re: weird TPS ECT sensor voltage drop causing issues

yes, thats were my problem is. Even the tuner has no idea about it, i got different tunes made for the engine. they all suck, im trying to find a hondata or something for less than expensive.

could it be a ecu problem?
Old 06-26-2012, 04:40 AM
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Default bad ecu?

my engine runs likes ****. I have been trying to figure out why for sometime. All my sensors are brand new, but heres the problem. All the sensors read low supply voltage, even at the ecu. The ecu is getting proper voltage and proper ground.

my ect voltage is 3.5
tps is.49 closed and 4 wide open
map reads 4

the car idles super rich all the time 12.1 on my wideband, wot fuel isnt bad but when ever i shift gears the fuel drops to 10.1 for a second

car is does not have a turbo

Last edited by Former User; 06-26-2012 at 06:52 AM.
Old 06-26-2012, 04:49 AM
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Default Re: bad ecu?

Do you have a friend with an ecu you could try?
Old 06-26-2012, 05:09 AM
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Default Re: weird TPS ECT sensor voltage drop causing issues

Who is this tuner? Is this person a professional tuner who you are paying to do this work, while your car is on a dyno? You need to take your car to a shop, and have it tuned by a professional. Don't worry about what software/hardware you're running. If you have some guy online cutting chips for you based off stuff you tell him, you're doing it wrong.

Take your car to a REAL tuner, who will put your car on a REAL dyno, and get your car a REAL tune. If the person doing your tuning is having trouble with the difference between stock and 310cc injectors, you need to find someone who isn't stupid.
Old 06-26-2012, 05:10 AM
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Default Re: weird TPS ECT sensor voltage drop causing issues

You don't get tunes "made". You get basemaps burned to chips "made". This is what you are doing. You are by no means tuned.
Old 06-26-2012, 05:22 AM
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Default Re: bad ecu?

It's your crappy basemaps. /thread.

Last edited by Former User; 06-26-2012 at 06:53 AM. Reason: Thread clean up
Old 06-26-2012, 06:51 AM
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Default Re: bad ecu?

Related posts merged. Only one thread per topic is allowed.

What exact Civic do you have?

What wire harnesses are you using?
Old 06-26-2012, 09:26 AM
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Default Re: ek with ls/vtec swap runs like crap -- bad ecu?

gonna have to figure something out before continuing to wash your bores down
Old 06-26-2012, 09:35 AM
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Default Re: ek with ls/vtec swap runs like crap -- bad ecu?

you have an engine problem.
an LS/vtec putting down the same as a d16? something is horribly horribly wrong and i'd find it hard to believe you'll lose 50+ hp in an ecu alone.
even on a straight stock build it should put down WAY more then that.
Old 06-26-2012, 12:06 PM
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Default Re: ek with ls/vtec swap runs like crap -- bad ecu?

its a 97 civic dx hatch
stock wiring harness converted for vtec
obd1 jumper harness for p28 ecu
Old 06-26-2012, 12:08 PM
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Default Re: 97 civic dx hatch with ls/vtec swap runs like crap -- bad ecu?

also another question, at 27 to 31 mph my car shakes under acceleration
no matter how much gas i give it it doesnt change

axles are brand new
halfshaft is brand new
has a type r lsd
wheels bearings are brand new and the rims were re balanced

i heard someone say hasport motor mounts could cause that??? i dont see that true because my d series with hasport mounts was fine
Old 06-26-2012, 12:22 PM
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Default Re: 97 civic dx hatch with ls/vtec swap runs like crap -- bad ecu?

Originally Posted by bscotti
also another question, at 27 to 31 mph my car shakes under acceleration
no matter how much gas i give it it doesnt change

axles are brand new
halfshaft is brand new
has a type r lsd
wheels bearings are brand new and the rims were re balanced

i heard someone say hasport motor mounts could cause that??? i dont see that true because my d series with hasport mounts was fine
One issue at a time.
Old 06-26-2012, 03:53 PM
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Default Re: 97 civic dx hatch with ls/vtec swap runs like crap -- bad ecu?

i have way to many....haha
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