[downest]

Ok so I maybe neglected to mention this...
My car isn't throwing any codes, but of course it's running like crap. When I jump the service connector, the CEL comes on solid. Now, this didn't happen before when I was throwing codes, like before I got the heated 4wire installed, then it would just blink out the code like it's supposed to. Could I possibly be in limp mode?

i heard a whisper of this limp mode on the internet and it sounds like what my car is doing... damn CRX is keeping me up all night

 

[Dren]

might be... have you reset the ECU too?

did you try out the obd0 dizzy?

 

[downest]

See other post... OBD0 dizzy mysteriously got broken in the shop. How long should I disconnect the battery to clear the ECU?

 

[Dren]

hmm, 30 seconds

easier to just pull the ECU fuse for 30 seconds. well...just as easy i guess

 

[mattminerDOTcom]

you pull the hazard fuse to reset the ecu.

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[downest]

So does the solid CEL sound like limp mode?

 

[Kwicko]

you pull the hazard fuse to reset the ecu.

Yup-yup. What he said.

That does sound like the "limp mode" I've heard talked about, but I can't say from first-hand experience. Do you have a "known-good" ECU you can try out?

 

[downest]

Yes I can grab my friend's P28. I don't think I've reset the ECU since I installed the O2 sensor. In a way I hope that's not the last problem, I'm going to feel really stupid if it is.

 

[downest]

People on other forums are telling me the solid CEL means the ECU is bad... anybody want to verify this? I'm gong to try resetting it and then borrowing one if that doesn't work... can't wait to get back to NY tonight!

 

[ComposiMo]

Solid CEL would indicate a bad ecu... if that is the case, then yea, it would run in a limp mode. Sounds like maybe you have a wiring issue with the 4-wire... could have toasted it.

Double/triple/quadruple check your o2 wiring before putting another ecu on it!

 

[downest]

How could that cause the ECU to go bad? Anyway yes, I had a mistake where I was grounding one of the heater wires instead of running it to the ECU harness, but I talked to Ryan again and he straightened me out. Would limp mode make the timing like it is? From what I've read, it retards the hell out of the timing and runs it really rich. That kind of explains why I have to advance the ignition so much, and why I'm getting black smoke and bogging.

 

[mattminerDOTcom]

is it a solid CEL all the time, or only when you have the SCC jumped?

solid cel all teh time = bad ecu

solid cel when SCC is jumped = no stored codes.

big difference.

I verified this in the eg civic FSM.

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[mattminerDOTcom]

also, i can go out in the parking lot and verify this on my p28 as well. but im damn sure thats right.

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[cagedrex]

solid cel all the time could be as simple as a couple wires crossed , i had the same problem i just did my conversion and had two of the dizzy wires backwards ,changed them and the problem went away

 

[downest]

solid cel when SCC is jumped = no stored codes.

That's what I'm getting... could I still be in limp mode?

 

[mattminerDOTcom]

ive never heard of limp mode on a p28......on like an vw/audi, subaru, etc yes. but not on a p28. the FSM makes no mention of this.

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[downest]

I've read a bit about it on Honda Tech, and it sounds a lot like what I'm experiencing. I don't know what else would explain it either...

 

[mattminerDOTcom]

ive seen people post about if before and i thiought they were incorrectly describing a sensor malfunciton issue. as far as i know hter eis not a 'limp mode' on the p28.

on the WRX it has one where it runs low boost and reatrds timing, but its very obvious and documented.....

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