Okay, I have a 90 Civic Hatch with a d15b1, dual point injection. Recently I swapped motors beause the old one went out. Almost everything that was on the old motor is now on the one in there. Once I got it running, I took it out for a test drive and everything worked fine. I stopped by a carwash and in the process i went ahead and sprayed some of the motor off too. When I left the car wash I went to gas it and it stalled a little bit and the check engine light came on. Once it came on, evertime i try to get in higher RPM's, dont have a working tach, around maybe 4000 it stalls and won't accelerate anymore.My ecu spit out code 16 which is defective circuit/ bad injector.

I dont think that it is an injector because it is the same injectors I was using before. Plus, I went to a junkyard and pulled the whole top part of the intake and swapped it out and it still does it.

Also, when I first got the car, I bought a little mod that hooks up to some wires and I wasnt too mechanical then and I spliced my injector wires and put it on there, but fixed that almost immediatly. It had worked fine rewired with electrical tape for the past three years, but I thought maybe during the swap the connection got bad so I respliced it and made a better connection. After that I drove it around for a few miles and gassing it hard when I could and everything worked fine. The next morning, I went to go to work and it started doing it again. So I disconnected it again and got some wire connectors and redid it making sure the connection was about as good as it can get and it still did it.

I have tried swapping injectors, making a better connection, and cleaning the connectors but none of that worked. What is the circuit, and where is it? I also have noticed that when the car is in gear and I start moving I hear like a sparking sound under the dash on the driver side. It sounds like two wires making a connection kind of like whenyou hook up a battery cable. It doesnt do it all the time, but my lights on my dash will flicker when it does it.

The car runs and idles fine. And if I reset the computer and start it up, I can rev it as high as I want and nothing will happen, nor will the check engine light come on. But when I am driving and i let the RPM's get too high it stalls and the check engine light comes on. It will still drive fine, I just can't get the RPM's up, kind of like a newer car that shuts off after a certain speed, when the RPM's get so high it just boggs. It wont even let the RPM's get up high in nuetral once the light comes on. PLEASE HELP!!!!

 

The circuit is basically that power comes from the main relay to one terminal of both injectors. The other terminal of each injector goes to the ECU with a seperate wire for each. The ECU pulses those wires to ground when it is time to inject fuel.

Any wires that have been cut should be soldered back together and taped. Other splicing methods are not as reliable.

 

I will give that a try, but it has not been a problem for three years. Would that be an explanation for the electicity noise I am hearing under the dash?

 

It's probably not related. But a potential situation of wires sparking needs to be checked out immediately before it sets your car on fire.

 

It has never made that sound before my "injectors" started messing up, and I have not touched anything under the dash. I don't know if it is actual wires sparking, it just sounds like that. Can any of the relays or anything like that make that sound under there? Is there anything that hooks up to my injectors under there that could be related to the injectors messing up? It sounds like it is somewhere around my fuse box. It is hard to pin point exactly because it only does it when the car is moving and I cant stick my head down there and drive at the same time. Could my main relay be causing these problems?

 

You should pull the main relay and resolder it because it can cause these sorts of problems.

 

I would pull the main relay and let it hang down plugged in,just to see if it made the noise first. I read all I can here about main relays, and they can cause countless oddproblems. Even if it didn't make the sizzle noise, I would reheat the solder joints inside like mk378 suggest.

If I read you correctly yousaid that you washed the engine down after theswap, at a car wash. If so, I would suspect every connection in the engine compartment as being a possible sourceof trouble.Water and Electricity don't mix.

I'm not saying it will solve your problem, relay first, but water in anyconnector is a potental corrosion point, and will cause problems later. Just from a prevention point I would clean all the connections. I only use mineral spirits for cleaning engines, and then at a low pressure avoiding electrical connections or anything else that shoulden't get sprayed. Then dry with air, before starting.

Let us know what you find, I have a similar post here as
"stalling problem"I was given some good advice on some things to check.

 

I think it does have something to do with the water. It had rained the night before I went to work. Thenwhen I left work it was still doing it, but i took a good little drive to the junk yard to get a main relay, and after running for a while and then turning it off,it started working fine again. I wasn't able to get the main relay. The place had closed.

All the wires seem to be cleaned though. Plus I went to our shop at work and redid the wiring to the injector that I had cut and it didn'twork.I will look into the other plugs too though. Any suggestions on what plugs might cause that? Also, it did make that sizzling sound under the dash and made the lights flicker on the dash too. I noticed it only does it when I let off the clutch and gas at the same time. Mainly when I shift, unless I do it extra smooth.