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Old 11/08/2011, 06:52 AM   #1
turbodc4
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Default 96 civic ls swap issue

ok so ill cut straight to it. My buddy and i swapped his 95 integra ls engine out of his 94 hatch and put it into his 96 civic coupe now it seems to be stuck in limp mode however the only CEL codes are Intake Air Temperature and O2 sensor which wont cause limp mode the motor ran strong in his hatch but not in his coupe. now im not 100% sure its limp mode cause when i give it less than 1/4 throttle itll rev to red line but any more than that if the engine is above 3000 rpms it sounds like it shut off and when it drops to 3 it just stays there unless i take my foot off it then itll drop back to idle and idle like normal. I am lost ive never had this issue any help in solving this would be greatly appreciated. ill give a list of mods.

0bd1 p75 ecu
jumper harness
AEM fuel rail
header
2 1/2 exhaust no cat

also things ive tried.
different ecu
different throttle body
different injecters
different fpr
new fuel filter
new plugs
new plug wires
new cap/ rotor
new cam sensor


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Old 11/08/2011, 11:20 PM   #2
H22APWRD94
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Default Re: 96 civic ls swap issue

What injectors did you put in it originally? What injectors did you swap in it? What model was the civic originally? Go ahead and wire up the IAT and the O2 sensor just to get that taken care of anyway. Will do nothing but help you to troubleshoot it, not serve to compound your issues.

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Old 11/10/2011, 06:10 PM   #3
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Default Re: 96 civic ls swap issue

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Originally Posted by H22APWRD94 View Post
What injectors did you put in it originally? What injectors did you swap in it? What model was the civic originally? Go ahead and wire up the IAT and the O2 sensor just to get that taken care of anyway. Will do nothing but help you to troubleshoot it, not serve to compound your issues.
Originally it was a 96 civic coupe ex, with single vtec I believe. We got the car as a rolling shell. As far as injectors it had the factory obd2 injectors I swapped them out for a modified set of obd1 injectors that the plug was modified to accept the obd2 pig tail. As far as the other codes I've taken care of them but still at a loss


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VTEC-all the lag, none of the turbo.
God invented turbo lag to give V8s a chance
VTEC: Virtually Torqueless Economy Car.
MITSUBISHI -Mostly In The Shop Undergoing Big Investments, Sometimes Halfway Incomplete
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Old 11/10/2011, 06:34 PM   #4
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Default Re: 96 civic ls swap issue

Was the distributor or timing belt removed when the engine was swapped?

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Old 11/11/2011, 03:31 PM   #5
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Default Re: 96 civic ls swap issue

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Was the distributor or timing belt removed when the engine was swapped?
No they weren't pulled and I know that the problem isn't in the timing I've checked checked and rechecked all possible timing related items such as timing belt distributor sensors in and outside the distributor.


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Quote:
VTEC-all the lag, none of the turbo.
God invented turbo lag to give V8s a chance
VTEC: Virtually Torqueless Economy Car.
MITSUBISHI -Mostly In The Shop Undergoing Big Investments, Sometimes Halfway Incomplete
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Old 11/11/2011, 07:23 PM   #6
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Default Re: 96 civic ls swap issue

Cool, I am just going through stuff in my head. Do you know what injectors the OBD1 injectors are? Most likely they are 240cc's because there were not many models that had the 180cc injectors in OBD1 trim.

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Old 11/13/2011, 05:21 AM   #7
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Default Re: 96 civic ls swap issue

I'm just lost I can't figure it out I don't get it I'm going to go through the wiring harness tomorrow and see if there is an issue there


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Quote:
VTEC-all the lag, none of the turbo.
God invented turbo lag to give V8s a chance
VTEC: Virtually Torqueless Economy Car.
MITSUBISHI -Mostly In The Shop Undergoing Big Investments, Sometimes Halfway Incomplete
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Old 11/13/2011, 10:02 PM   #8
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Default Re: 96 civic ls swap issue

You used the original wiring harness that was in the car and you are sure your MAP and TPS are not switched around?

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Old 11/14/2011, 03:16 AM   #9
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Default Re: 96 civic ls swap issue

Ya the 2 plugs are on different sections of the harness and the car doesn't run when I switch them around so those are right however extensive wire tracing led me to a couple of plugs that were not plugged in so I'm going to try to find their location tomorrow. But the fact that there is no check engine light related to said plugs are a bit of a mystery


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Quote:
VTEC-all the lag, none of the turbo.
God invented turbo lag to give V8s a chance
VTEC: Virtually Torqueless Economy Car.
MITSUBISHI -Mostly In The Shop Undergoing Big Investments, Sometimes Halfway Incomplete
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Old 11/14/2011, 10:02 AM   #10
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Default Re: 96 civic ls swap issue

Most likely then to something that is not relevant on an OBD1 vehicle. There are a couple emission related plugs on OBD2 that are not present on OBD1 engines.

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Old 11/17/2011, 04:33 AM   #11
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Default Re: 96 civic ls swap issue

I agree the plugs were nothing important. However the issue is now, at 1/4 throttle it will rev all the way to redline but any more than that its like it cuts fuel or spark sounds as if you shut the car off with your foot on the gas. So I believe that the issue is in the wiring for the tps sensor beings that ive tried a different throttle body off a car with a good tps this damn thing is starting to really get under my skin.


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Quote:
VTEC-all the lag, none of the turbo.
God invented turbo lag to give V8s a chance
VTEC: Virtually Torqueless Economy Car.
MITSUBISHI -Mostly In The Shop Undergoing Big Investments, Sometimes Halfway Incomplete
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Old 11/18/2011, 04:48 PM   #12
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Default Re: 96 civic ls swap issue

you may have to check the map sensor i know that its not the dizzy and if its not the throttle body it can only be a few more things one the wiring change to obd1 or a short somewhere maybe even the ecm, ecu, computer how ever you want to fucking name it, or a map sensor cuz i know the car ran just fine before the problem started i may not be a honda expert yet but thats my guess

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Old 11/18/2011, 04:53 PM   #13
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Default Re: 96 civic ls swap issue

I had the problem with mine not havin any power after 3 grand drivin and ive heard it couldve been from using the stock fuel pump cuz not enough fuel pressure but Idk i got mad and put my single back in

Last edited by whitsingleslamer; 11/18/2011 at 04:56 PM.

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Old 11/18/2011, 10:39 PM   #14
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Default Re: 96 civic ls swap issue

The fuel pressure is the same on ls and single cam and it isn't anything fuel related I've tested all the injectors and they check out fine plus it has an AEM fuel rail with fuel pressure gauge and it reads correct fuel pressure the car runs and drives great a long as you don't give it more than 1/4 throttle so I think the problem is in the wiring harness.


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Quote:
VTEC-all the lag, none of the turbo.
God invented turbo lag to give V8s a chance
VTEC: Virtually Torqueless Economy Car.
MITSUBISHI -Mostly In The Shop Undergoing Big Investments, Sometimes Halfway Incomplete
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Old 11/25/2011, 10:57 AM   #15
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Default Re: 96 civic ls swap issue

I would pull the harness and double check the wiring and make sure you didn't mix up or skip any connections. You may have already done this but it is where i would start.

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Old 06/03/2012, 01:39 PM   #16
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Default Re: 96 civic ls swap issue

Ok not going to beat a dead thread however if anybody is having this issue we corrected it. It was not in the wiring or engine components it ws actually a fairly simple fix. A crush washer was left out when hooking up the fuel rail causing a restriction in fuel to the injectors making it appear as if it was in limp mode. After reinstalation of said washer car now revs to redline under any amount of throttle.

Last edited by turbodc4; 06/03/2012 at 01:40 PM. Reason: Damn droid swype

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Quote:
VTEC-all the lag, none of the turbo.
God invented turbo lag to give V8s a chance
VTEC: Virtually Torqueless Economy Car.
MITSUBISHI -Mostly In The Shop Undergoing Big Investments, Sometimes Halfway Incomplete
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Old 06/03/2012, 11:10 PM   #17
H22APWRD94
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Default Re: 96 civic ls swap issue

Thank you for the update. Glad to see it was an easy fix.

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