Ok guys and gals I bought a 94 ex coupe with a b20b in it. Used to be into Hondas but got out the game for a while. So I got the car it ran terrible. Can timing was off along with a ton of other stuff. Got it running like a sewing machine now (when the motor is warm). It got a little hiccup from time to time at lower rpms randomly. Very small but shouldn’t be there. My main focus right now is that on cold start ups it won’t even hardly stay running. Rough idle and wants to cut off but like it said I can idle it up till it gets some heat in it and it’s fine. Other than smelling gas all the time because I believe it super fat it runs great. Cut it off while it warm and fire it right back up with no issues what so ever. Didn’t know if maybe someone could give me some pointers. They guy I bought it from also said he thinks that it has huge injectors that he had just laying around. Could an injector too big cause this cold start problem or is it something else? Any help appreciated.

 

update I just put a set of injectors out of another b20 in it that I know where good and also change the map sensor and it’s running worse now than it did before.

 

Which ECU are you running?

Are there any CELs present?

 

It currently only showing a code for ect sensor. I’ve replaced both of them in the head and still have the check engine light. Ordered a harness because I guess it had to be a wiring issue. Also could the iacv cause this? It take a few more turn over to start when it’s cold and barely does idle (wants to cut off) but soon as it gets some heat in the motor this thing runs like a sewing machine. Also I have a p75 ecu

 

Focus on fixing the ECT sensor issue - this is the root of your rough cold start problem.