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downest
Online
1151 posts [100%]
Melbourne FL
7-28-2005
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I guess I should add a little more info... the teg is freshly swapped a few days ago and is having a weird driving issue. Basically at cruise, between 1500ish and 2500rpm it stutters and bucks like its misfiring badly. It's also throwing a code for IACV. If you floor it or get into load fast it pulls like a mofo, no stuttering issues, but at cruise and lightly revving it at a stop will make the stutter happen. Could it be possible he switched the IACV plug and the PCS, so it's like trying to trigger the purge but actually getting the IACV? I don't know if that even makes sense but I'm trying to understand what's happening and why my ECU is now [freak]ed up.
Tom Downes
1991 CRX SiPanducky Motorsports Central Florida's only Authorized NepTuner/Dealer CRX Community
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Relic1
Online
3885 posts [100%]
chicago burbs Il
10-4-2002
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which wire colors do you have at the plugs? (and which harness)
I can tell you if they are switched or not.you may also have your IAT and EVAP purge switched and a bad IACV.
Both are common with new swaps. with Q31 blown or smelling bad, your ECU will still work fine. OBD1 does not throw a code for EVAP purge.
Official bring NOFX back club member #who cares what number - bring NOFX back!!!
I know... I can't spell.  (and I have dyslexic fingers) 
>>> the civic hatchback community  <<< http://picperformance.com 
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downest
Online
1151 posts [100%]
Melbourne FL
7-28-2005
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| Quote, originally posted by Relic1 » | which wire colors do you have at the plugs? (and which harness)
I can tell you if they are switched or not.
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I can trace colours but I don't know if they kept the stock plugs in the stock location when doing the swap. I called my roommate and told him to bust out the multimeter and go through ALL of the wiring from the plugs to the ECU pins and see if he can find anything wrong. | Quote » |
you may also have your IAT and EVAP purge switched and a bad IACV.
Both are common with new swaps.with Q31 blown or smelling bad, your ECU will still work fine. OBD1 does not throw a code for EVAP purge. |
I'm not as concerned with the wiring on the swap right now, if I do it myself I know I can get it straight, but I don't really feel like doing it. I'm more worried about my P72, since I don't actually know what's wrong with it. It's throwing a solid CEL, and then if I take the chip out and put it in another ECU and plug that in, nothing, runs perfect.
Tom Downes
1991 CRX SiPanducky Motorsports Central Florida's only Authorized NepTuner/Dealer CRX Community
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Relic1
Online
3885 posts [100%]
chicago burbs Il
10-4-2002
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| Quote, originally posted by downest » | | It's throwing a solid CEL, and then if I take the chip out and put it in another ECU and plug that in, nothing, runs perfect. |
sounds like a bad chip job. Solid CEL with J1 removed?
Official bring NOFX back club member #who cares what number - bring NOFX back!!!
I know... I can't spell. (and I have dyslexic fingers)
>>> the civic hatchback community <<< http://picperformance.com
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downest
Online
1151 posts [100%]
Melbourne FL
7-28-2005
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It's my personal ECU that I've had for years, I chipped it a LONG time ago and never had any problems.
Tom Downes
1991 CRX SiPanducky Motorsports Central Florida's only Authorized NepTuner/Dealer CRX Community
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Relic1
Online
3885 posts [100%]
chicago burbs Il
10-4-2002
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not questioning your abilities or that it was done right.
Did you try it with J1 removed?
Sh!t happens sometimes, ESD the board when putting in the new chip, solder joint goes bad, etc. I've had it happen to me a few times.
Official bring NOFX back club member #who cares what number - bring NOFX back!!!
I know... I can't spell. (and I have dyslexic fingers)
>>> the civic hatchback community <<< http://picperformance.com
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downest
Online
1151 posts [100%]
Melbourne FL
7-28-2005
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Ok thanks, I'll try that in the morning when I get back to the shop. I have a Neptune ECU I'm trying out that got me home... I'm sold 8)
Tom Downes
1991 CRX SiPanducky Motorsports Central Florida's only Authorized NepTuner/Dealer CRX Community
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Relic1
Online
3885 posts [100%]
chicago burbs Il
10-4-2002
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Hondata S200/Hondata S300/Crome/Uberdata/Neptune/eCtune. Tuned & ran them all.
eCtune is in my car currently. No plans to go to anything else any time soon.
Official bring NOFX back club member #who cares what number - bring NOFX back!!!
I know... I can't spell. (and I have dyslexic fingers)
>>> the civic hatchback community <<< http://picperformance.com
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downest
Online
1151 posts [100%]
Melbourne FL
7-28-2005
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I've used all those but eCtune now, and a bunch of other systems on different cars. I really like Neptune... BUT whatever I used I'd be stuck without an ECU to use it with :/ Is there a good way to test for bad components, or anything else I should look for? None of the electrolytic caps have burst or anything, nothing is obviously bad it just kinda smells bad.
Tom Downes
1991 CRX SiPanducky Motorsports Central Florida's only Authorized NepTuner/Dealer CRX Community
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Relic1
Online
3885 posts [100%]
chicago burbs Il
10-4-2002
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Smell is a bad sign, but troubleshooting an ECU is next to impossible via the internet.
What part smells bad? Q31? not a show stopper at all, unless it's shorted.you're not too far from this guy...
- Tom Sewell :
* Swell Racing
* Location: Port St Lucie, FL
* Phone: 1 772 940 3455
* Sewell94 (at) hotmail.com
I'm sure he could tell you what the problem is. (in person of course)
Official bring NOFX back club member #who cares what number - bring NOFX back!!!
I know... I can't spell. (and I have dyslexic fingers)
>>> the civic hatchback community <<< http://picperformance.com
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.nate
Offline
3102 posts [100%]
Orlando FL
10-2-2001
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Cut J1 and see how the ecu runs. That will help narrow down the problem.
Grip Industries
eCtune Honda Tuning System
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calvinPGMFI
Offline
391 posts [100%]
eCtune Dev country
10-23-2003
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if it still doesn't run after cut j1 then the ecu is f**
Developer of eCtune... Next generation obd1 editor... Check out.
eCtune Authorized Tuners, eCtune Authorized Resellers:
http://www.eCtune.com.....
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downest
Online
1151 posts [100%]
Melbourne FL
7-28-2005
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I made my roommate go through the car and check the wiring, there was a mixup somehow between the TPS signal, PCS output and IAT signal. The IAT got killed in the process.
Tom Downes
1991 CRX SiPanducky Motorsports Central Florida's only Authorized NepTuner/Dealer CRX Community
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zccr-xsi
Offline
2233 posts [99%]
central FL.
7-22-2004
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| Quote, originally posted by calvinPGMFI » | | if it still doesn't run after cut j1 then the ecu is f** |
pretty much sumes it up right there! when Q 31 blows 50%chance it will blow off ethier the pad or a tracer,if it blows a pad it can be fixed but is hard as hell.if it lifted a trace your ecu is [freak]ed.did it leave burn marks on the ecu case?
ecu chipping!http://www.thezcr.com/forums/s...17635 ecu vouches!!
onesixteen eg6low-buck Red_ED8 crxbart ef-hatchcrap si foo obuhmyuh
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Relic1
Online
3885 posts [100%]
chicago burbs Il
10-4-2002
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| Quote, originally posted by zccr-xsi » | pretty much sumes it up right there! when Q 31 blows 50%chance it will blow off ethier the pad or a tracer,if it blows a pad it can be fixed but is hard as hell.if it lifted a trace your ecu is [freak]ed.did it leave burn marks on the ecu case? |
I've repaired boards that had large chunks missing... anything is repairable. A blown trace or lifted trace is far from a total loss.
Official bring NOFX back club member #who cares what number - bring NOFX back!!!
I know... I can't spell. (and I have dyslexic fingers)
>>> the civic hatchback community <<< http://picperformance.com
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downest
Online
1151 posts [100%]
Melbourne FL
7-28-2005
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Yup I've repaired boards before too, thing is there are no burn marks or anything in the board. I haven't had a chance still to check it, but I'm gonna pull neptune out real quick and try it before I head home.
Tom Downes
1991 CRX SiPanducky Motorsports Central Florida's only Authorized NepTuner/Dealer CRX Community
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