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Discussion Starter #1
Hello everyone I am new to this forum and have within the last year bought a 93 Civic SI with a d16z6. I have been having a couple things that have been kind of weird with this car since I bought it. The first thing is it has always been a little sluggish under 2500 rpm and that is me comparing it to the d15b7 I used to have. It has always smelled like fuel and leaves black soot on my tail pipe. It came with an aftermarket header and the o2 sensor is only reading from one cylinder could that be the issue I can relocate it to where it reads from all 4. its got newer wires and plugs within the past 6 months. Recently I drove it through a huge rainstorm and hit large puddles and during that it was stuttering really bad but the next day was mostly okay, but now it randomly does that under acceleration, which I thought may be cap and rotor got water in it because of where it sits... Any ideas would be greatly appreciated. Thank you.
 

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BATSLOMAN GIVES NO FUCKS.
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check cap and rotor, check timing. black means fuel, blue means oil, white means coolant
 

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How many miles on the motor? Also check your air filter too, also pics to see what you're working with in the engine bay
 

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Discussion Starter #4
The Miles are unknown on the engine I know its been rebuilt but I do not know how long ago, or how well its been done. The air filter was just replaced yesterday, and I will shoot a picture tomorrow and post it when I start working on it.
 

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Might also want to check for a vacuum leak. I had one and my car would idle rough and the ecu would force the car to run rich and black soot would be coming out of the exhaust.
 

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Well I decided to take a look at the condition of the cap and to my surprise there is a bit of oil inside so I'm thinking a new distributer possibly.
 

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BATSLOMAN GIVES NO FUCKS.
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new distributor seal. find the fsm to download to see how to check to make sure its still working
 

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Discussion Starter #9
Okay so since I now have the distributor taken care of do any of you think moving the o2 sensor will make any difference?
 

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THese cars dont care if its only one cylinder or all 4 sampled.

regarding the fuel issue, one method I use to try and clean out shitty fuel injectors is a full bottle of Chemtool B12. it is a fuel system cleaner.

I still laught at how the parts guy described it. the small bottle of injector cleaner is like a beer. the Chemtool is the liquor. lol.


Run the FULL bottle on a 1/4 or half tank.

This will help you clean out the bottom of the fuel tank, help clean the fuel pump and its sock filter, loosens garbage caught in the underhood fuel filter, and should unstick any injectors that are open longer than the ecu tells them too.


This will at least remove any clogs and debris, so you can focus back on ignition ssues if still present.



I find this a cheap and worthwhile method. IF it doesnt sovle your problems, at least you just cleaned your fuel system really good. AFTERWARDS, I highly suggest a new underhood fuel filter, even if you just did it. the crap that comes loose just comes up and clogs it anyways.
 
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