My d15b in my civic is idling weird and popping when under acceleration. The problem has just occured since my car was down due to paint.

I planned on pulling the motor to swap into my sedan, which I plan on dailying for now on.

Since the motor isnt running right I dont want to swap it over until it is running correctly.

Here is a video of the car driving and one of the random pop during idle:

http://www.youtube.com/watch?v=Zaf2TGzqbeU

Idle video didnt turn out due to wind.

Things I have done:
-Cleaned throttle body
-Cleaned intake manifold
-Cleaned cap and rotor (looked decent to begin with)
-Adjusted timing, but it didnt help so went back to what I think was the original setting before I had issues.

I plan on filling the tank via container with some fuel system cleaner. I also am going to get a new pcv because there was a tiny bit of oil in the intake pipe(stock) and a little on the throttle body. Not a lot, nor was it caked on there. Just sprayed some throttle body cleaner on it and most of it washed away just from the spray.

I am going to take my other dizzy with a new cap and rotor and see if that helps.

The spark plug wires and plugs are relatively new.

I can provide pictures of any parts if people are willing to help. Just would like to get this motor running correctly so I can get it into my sedan.

 

After I cleaned the throttle body/intake mani/cap and rotor, the car idled fine for about 5-10 minutes then started popping again.

 

Electrical grounds... fix them.

 

Will do tomorrow. I will report back. Thank you.

 

i'd check the plugs and wires just to make sure. even tho you say they're relatively new. i had a set of bosch platinums in my car that burned out after around 15-20,000 miles. so dont rule that out. if thats not the problem then check the fuel filter. another problem could be if you were running 87 octane and let it sit in the tank for a while.

 

lol. another thing.. If you've got any bosch parts in your car, change them back to OEM or OEM equivalent (Denso/NGK etc.). Japanese cars don't run well if you use anything but stock parts. Use European parts on European cars and Japanese parts on American and Japanese cars. Bosch isn't necessarily crap, it's just that if the car isn't designed with it in mind, it won't run right. Hondas especially are finicky if you don't use the correct OEM parts.

 

Redid my ground that comes off of the valve cover. The problem went away, but only for about 15 blocks or so. I filled the tank, along with some fuel system cleaner. I will replace my bosch plugs even though they are new with the oem equivalents I have in my basement which are also brand new.

The fuel filter is new, but I will check that as well.

The problem doesnt seem to be AS bad since I redid the ground, but still bad.

 

Initial startup seems fine now, idle seems to be normal. When I drive it still seems good for the first 8-10 blocks or so. Then first gear seems to be relatively fine, just a little off...but second gear pops once I engage the clutch. If I let off of the accelerator the popping stops until I press on the accelerator again.

New plugs and fixed ground, along with new fuel w/ fuel system cleaner were my last things done to try and fix this.

 

There are other grounds you should redo, such as the one for the thermostat, etc.. If you can get an Ohm meter and with the assistance of the helms manual (honda service manual) go to each ground and probe them, getting a reading of the ohms value from the ground point to the battery negative terminal, and seeing what the ohms value is, you can then tell if the ground needs to be cleaned up/repaired. First ground I would re-check is the ground you just fixed. Ohms should be no more than 1. oh and btw, measure the ohms value from the body of the o2 sensor to the battery negative terminal. that should be about 0 ohms with above 2 ohms causing the car to not be able to read the o2 sensor output. (O2 sensors use the exhaust manifold as a ground in order to send the signal to the ecu)

 

Alright. I already own a meter...I will check them here shortly. Thanks for all your help so far fleabag.

 

Sounds like its not running on all 4 cylinders or the firing order is not correct.

 

timing issue for sure from what it sounds like.

 

I have confirmed it is firing on all four and the wiring is in the correct order. I thought maybe timing as well.

 

have you checked the timing? no cel? it sounds like a timing issue. bad dizzy? they do randomly fail.

 

I adjusted timing and it helped a lot. I kind of have a dead spot maybe around 2k rpm in 2nd. I dont have a tachometer so I dont know exact rpm. It does not sputter anymore though.

No cel, and getting a timing gun here shortly.

 

it sounds to me like its off. it shouldnt sound like that. lol....hit me up if you need anything else you know the number.

 

sounds like OP has a comprehensive problem...

 

I checked all my grounds and they checked out. I checked dizzy, checked out. I checked all other spark and fuel components, they checked out. Compression is spot on.

I adjusted timing and it fixed the problem.

Not really sure how that is a comprehensive problem...

 

But your car still has a problem....right? That would mean you have at least 3 problems going on concurrently. Other thing I'd suggest is replacing the PCV valve and possibly any old vacuum hoses you have as they could be leaking.

 

idk if i read it wrong, but he said I adjusted timing and it fixed it.

 

yeah but I read this and thought he was not done with it
That said to me that the grounds helped and the timing helped but that he still has a problem.