I got 89 dohc swap into hatch replaced thermostat and it is used rad, I got timing set today and it its running smooth but coolant tank is getting hot and when I shut engine off air bubbles from hose into coolant tank, how to fix or what is wrong thank you, just tryna get back in the ef game

 

I might check the thermostat again I replaced it last summer
my top hose is hot and bottem hose is cold could I possibly be a clogged radiator?

 

could be a bad water pump

 

I should have mentioned but the water pump timing belt tension and thermostat have all been replaced within the past year

 

I am getting code 1 and 9

 

bump bump , my upper hose is much hotter than lower hose

 

code 1 - O2 sensor

code 9 - Cylinder sensor - most likely, exhaust camshaft timing is not correct - probably off one tooth (or more) - could be in the wiring, i.e. bad connection or the two wires to the sensor switched - extremely rare for sensor to be bad

 

The code 9 could be causing the code 1.
The O2 sensor often trips when exhaust content is bad.

 

Did you bleed the air out of the system? The bleeder is on the back of the head just above the radiator hose.

 

I haven't tried to bleed the coolant yet I am going to be working on it Thursday, it is most like air in system engine sat in garage for 2 years with plastic over it... there is a sensor on the end of the exhaust cam shaft it is not wired up correctly on mine this is were I am having my problems with the codes I think. I have the pg7 or pm7 out of 89 integra I forget which how do I wire the exhaust cam side sensor on the dohc zc. thank you

 

what model is the car? does it have the original engine wiring harness on it? how was the ZC distributor wired up?

89 Integra ECU is PG7

 

thanks for input. I have the PG7 ecu from 89 integra. the distributor is currently wired to the stock round plug on harness, the sensor on the exhaust cam has two wires coming out of it. I believe someone messed with it before. I have read online where it says they need to be pinned to the ecu somehow I have no idea how to do this. also the wires that come out of that sensor are red and yellow my guess is someone cut and hacked the wires up. it is a 89 civic dx or std hatch

 

I have stock harness

 

These wires?

https://honda-tech.com/honda-crx-ef-...civic-3207325/

https://honda-tech.com/honda-crx-ef-...ic-ef-3206970/

If it's the same ones you are referring to the real wire colors should be blue/green and blue/yellow if I recall correctly.

Check the FAQ for MPFI conversion and look specifically for the wires added to the distributor. The only difference here is that sensor is separate instead of integrated into the distributor. Use the guide to locate the pins on the ECU and then run the wires directly from the ECU to the that sensor. It'd be preferable if you can salvage some pins off of another plug from the junkyard or order new pins to crimp onto new wires.

EDIT:

Here's a link for you to reference those two wires.

https://honda-tech.com/honda-crx-ef-...-easy-2889205/

 

thanks 24ten but that link did not help me, on the dohc zc there is a funny like sensor on end of exhaust cam, it has some wires sticking out (it most likely had a plug on it). these wires are not hooked up and are most likely causing the code 9 so I do not know where to hook the wires up

 

Here's a hint, that sensor that ISN'T integrated into the distributor like it is on the SOHC MPFI distributor is the sensor you are looking at on your DOHC ZC. If you need me to spell it out for you, please say so.

 

ok so heres where im at I uploaded a picture of my ecu, so I would have to cut the top wire with arrow and run blue/green wire from cyp sensor and blue yellow wire to bottem arrow? could I just run these two wires to my obdo dizzy plug that way I do not have to cut any wires?

 

#1 You're not pointing to the correct plug. See the link, count the number of wires in the MS Paint picture included, verify you're looking at the correct plug.

#2 Clarify something for me/us. Is this car already an Si to begin with? From the looks of the pics of the ECU plugs you provided it appears to be. This is absolutely crucial as to what steps to take next.

#3 Can you snap a pic of the distributor plug and the mating plug from the harness? I have feeling this is much simpler than expected.

 

ok I can get a picture of it but I just been outside messin with it, like I was saying about the cooling.

tell me what u think I got 2001 integra I took radiator cap off of it and revved it all up and nothing came out. and on the hatch did same thing and puddles of it shot out of radiator. is this a bad headgasket or what could be my issue?

forgot it is not an si, at least not to my knowledge it has no sunroof, it does have si cluster n front seats but I think they were swapped into it

 

Ok the reason I ask is because the harness plugs on the ECU side do not appear to be cut/spliced at all. Also, if you haven't already figured it out, the C1 and C2 locations already have what appear to be the correct blue/yellow and blue/green wires. Combine that with the fact that injector wiring appear to be the correct color for factory MPFI and that leads me to believe at the very least a full harness swap has taken place if not it's an Si. Either way, it runs so really all you need to do is verify the distributor plug. Maybe you can just confirm real quick, does it have two round plugs? Or a rectangle and round plug? Reference the pic above, DPFI distributor plug and "OBD0" plug.

 

its a round plug I figured how to wire it but my question now is about the cooling problem mentioned above, does this sound like my head gasket is bad?

 

I do not want to work on engine if it has blown head gasket. It was replaced once before I got it and I had it replaced after purchasing it.

 

You haven't stated that you have bled the cooling system properly. If you do this and still see a steady stream of bubbles while it's idling then it's a pretty good indication of a head gasket failure. A compression and leak down test will give you a better understanding of what's going on. Would you like an explanation of how to bleed it with and without the bleed nipple?

 

I will try to bleed coolant through bleeder.. elaborate on bleeding it without bleeder screw

 

I seemed to have got the cooling figured out.. the code 9 would cause it to run rough?