I am having a headache with my H22 civic. Code 3 is showing. Replaced map sensor, the connector, TB, swapped ecu and i even took the whole harnees out to check but nothing. I also swapped the distributor and changed all vacuum hoses. I checked all grounds as well. It will stay running but it runs like a crap and sometimes it pops from the intake

 

Stock ECU?

Did you change anything out before this happen? any back round info will help..

 

I don't understand this.

 

It is turbo. Ecu p28 tuned on neptune"chip". It was running fine. I haven't changed anything recently.

 

It sounds like backfiring from the intake

 

Check the map sensor settings, or try to download then upload the tune again.

 

You probably don't have the correct map sensor.

 

What map sensor is the ECU set for?

stock?

Are you sure its code 3 for Map sensor?

 

He's boosted so not stock.

 

The stock map sensor can be used up to 11 psi, after that a 3 or 4 bar is needed to read more boost PSI, its not the best map sensor to use on a boosted setup but it works and most software has the stock map sensor quick setting to use as well. I'm just wondering if his calibration is set for a 3 or 4 bar and the OP thinks he has a stock map and replaced it with a stock map which is why the code remains.

Make sure the wires are in the correct pins in the plug housing when you replaced the plug in case the colors of the wires did not match up on the replacement and also make sure the pins are tight when they are plugged into the map and make a solid connection.

Its most likely a wiring issue, look at the conversion harness at the ECU for any wires slightly pulled out and push them back in, the conversion harnesses can become loose causing all sorts of electrical issues. Its always good to have a quality made ECU conversion harness, the EBAY no name CHINA ones are garbage and hit or miss!~

 

You don't say....

Well what I'm trying to get at is that maybe try to find another one like what was on the car originally? This might be a car OP picked up so probably wasn't given enough info.

 

Yes this is the info we need to know!

OP post a pic of the Map sensor.

 

The car was dynoed on neptune at 8psi (stock maps sensor). It is my daily i drive it without issues. The code blinks 3 times quickly so it is the map sensor. I will post a pic of the replacement map sensor when i get home.You guys think that they gave me the wrong map sensor? When i went to the store the sales staff he told me that accord,civic,prelude uses the same map sensor.

 

Yea there the same as far as I know, when I had issues with my map and still do, because for whatever reason these among a few other sensors are very sensitive when it comes to cutting and splicing the original wires, I swapped in a D series map as well as a b series map and changed the setting and both worked the same, What you should do is try and get a laptop and open up the program and see what the map sensor reads with ign. on and engine off. if the value is anywhere beyond 0.2 - or + the engine will not start up or run properly. this is my bug I'm dealing with, every now and then the wires move or something and the map sensor reads 1.2 for example and I would have to wiggle the wires right where the plug is to get it to read 0 again and then the engine would start properly, sometimes I would start the engine and it would start up and run very rich! so I would know somethings up and so I connect the laptop and notice the map is reading + psi. After messing with it till it settles to 0 it would start and run properly after. I think I just need a new engine harness because I did the best job I could when I had to fix the job I did when I extended the map sensor the first time. But if I even touch the wires while the engine is running it will break up and pretty much shut off!~