gnxpro24

iTrader: (1)

B18a1 in 91 Civic EX, obd0. Ive had an obd0 code 9 for a month now that no one seems to be able to explain. Turns on at about 6500k with one dizzy I have and another it turns on at 5k. Highway speeds set it off at 4k.
Now I have a new code that Im not sure if Im deciphering correctly or not. It is 4 individual solid "blinks" followed by 3 short blinks. Would that be a code 43? If so thats for fuel system. What would cause this? I just replaced the fuel filter. The past 2 days the car has been sputtering below 3k in any gear, as soon as it hits 3k the sputtering drops and the car runs like a champ, then I get a code 43. Also using gas like crazy. Seems as if the car runs ok til engine heats up. I need this solved, the code 9 can wait. Im making a jumper to go to obd1 to use my brand new obd1 dizzy to see if the code 9 will go away. All help is appreciated.

ef yu

code 9 is CYP. cylinder position sensor. its in the distributor.

Code 43 can be very tricky.
i have heard people changed out oxygen sensor,spark plug, fuel filter, fuel pump, injectors, fuel pressure regulator (check pressure to see if low). Try trouble shooting with the things you have access to cheap/free with known working parts.

codybuRr

i have the same motor, same ecu.
it was wierd that I got a code 9 too.
I re-soldered on a single coolant temp sensor, plugged it in and it was gone

OneBadTurboCRV

I have heavily covered code 43... Search.

codybuRr

or post link?
since it's something you covered, you diggy?

OneBadTurboCRV

I have to search for it too... It's not like I index every thread I post in...

http://htarchive.com/showthread.php?p=46516862

http://98.158.194.248/showthread.php?p=45796327

https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/code-43-bad-mpg-bad-fuel-smell-2989615/

http://www.ht-archive.org/showthread.php?p=46150232

http://www.htarchive.net/showthread.php?t=2999273

This is just the beginning...

PS - No, I don't "diggy" as I have no clue what that means.

crx_si-r

code 9 cylinde position sensor. it could be you have a misfire. if you do, this would be the cause of your code 43.

check you spark plugs. just because you have a misfire, doesnt mean its in your distributor. pull out #1 spark plug and look at it. it may be damaged.

79powerwagon

code 9 is the cylinder position sensor,

gnxpro24

iTrader: (1)

the ect on the cylinder head, or the coolant temp sensor on the thermostat?

gnxpro24

iTrader: (1)

Checked all spark plugs. No damage or bad burn

gnxpro24

iTrader: (1)

So it is confirmed that 4 solid blinks and 3 rapid blinks is code 43? Also, just wondering if this could cause it. I have an obd1 header so instead of having the obd0 o2 sensor close to the cylinder head, it is beneath the car. Since it cold here in Pennsylvania, maybe its not reading right since its not a heated o2? Would make sense because I only drove my maroon car in the summer so it was never cold outside. I also dont have the purge wired to the ecu, its unplugged. Could that cause the code and problems?

crx_si-r

Did you hook up the fuel filter lines backwards?

codybuRr

the ect or whatever.
I thought it was for coolant no?

gnxpro24

iTrader: (1)

No, and this started before I replaced the fuel filter

gnxpro24

iTrader: (1)

Engine Coolant Temp sensor. Determines temp of coolant

OneBadTurboCRV

CTS - Coolant Temperature Sensor
ECT - Electronic Coolant Temperature

Same things different wordings - A two wire sensor that tells the ECU what the temperature is and that is what throws codes.

The other one is the TSU - Temperature Sending Unit. This is a single wire sensor that sends the temperature reading to the gauge cluster.

If you are using a 1-wire O2 sensor it must be within about 1 foot of the head to work properly. It relies on engine exhaust temperature to function correctly - hence why it isn't monitored until the engine warms up. On a 3-wire (in Hondas a 4/5 wire) O2 has a heating element built in. This way it can more accurately take a reading downstream near the collector so it can "see" the engine's overall running condition. This far away from the cylinder head requires this.

Unless you are OBD-1 you won't have fast and short blinks, only blinks with pauses saying its the next code.

gnxpro24

iTrader: (1)

So are you saying that relocating the o2 could solve this? Or is it related to the unplugged purge solenoid? Or neither? Also if it isnt a code 43 what is it? It blinks 4 long blinks, one after the other, then 3 short blinks

OneBadTurboCRV

Well if it is in fact doing what you say it is then I guess it's a code 43... The purge will NOT throw a code, nor cause the running issues you have. Didn't you say before you had vacuum straight to the fuel tank before? (Did you fix that?) Also, yes - fixing the O2 could help with a code 43.

gnxpro24

iTrader: (1)

Yes I fixed that. Also what you said confirms my hypothesis. "The o2 isnt monitored until the engine warms up". That explains why it runs fine til the engine is warm.

gnxpro24

iTrader: (1)

Finished converting to ob1. No new codes, just the same old code 9

gnxpro24

iTrader: (1)

Still getting a code 43 for fuel supply system. Already replace fuel filter and o2 sensor, since I just swapped to obd1 (code was present on obd0 as well). Loss of power, low idle after warm-up (4-500rpms), black/grey soot on back bumper, terrible gas mileage, and smelly exhaust are the symptoms. Any ideas? Really starting to lose faith in the EF gen.

gnxpro24

iTrader: (1)

Still having these symptoms. EACV is making a weird whining noise, replaced it and noise went away, now its there again. Intae is making weird noise too. All these symptoms pointed to bad injectors or FPR. Replaced FPR and can hear injectors clicking. It would be nice if people would help me out here

philthee1

i had code 43 once turned out my alternator belt was loose and my fuelp pump was not gettting good voltage all the time was a pain in the *** to figure out

i literally replaced every fuel system part including the tank and turned out to be the ****ing belt what a nightmare

philthee1

also try cleaning injector screens and changing out the ignitor on the distrib that might help

OneBadTurboCRV

Losing faith? Hah, no problem with an automobile is so mysterious that it can't be solved.

Have you looked through ALL the threads I posted about code 43?

Check this out and check all the links out in post #5...
https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/cel-code-43-%22fuel-supply-system%22-b18b-swapped-eg-hatch-2266370/

This is a really decent one (can't remember if I posted it or not) to check out...
http://www.preludezone.com/general-t...explained.html