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Cool User Title Here
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I went to start my car today, and upon startup my car runs really rough. After a few seconds I get a CEL, and its code 16, fuel injection system. It did this for a few starts, so I went under the hood of the car and played around with things, and the only issue I could find was a couple of loose plug wires (still engaging the end of the plug, just not fully).

After I played around under the hood, I started the car and it ran fine until a few moments later when I was going around 60, and it started doing the same thing, just no cel. I shut it down and started again, no luck, shut down again, started again a few moments later, and it was fine till I got home (about 45 minutes). The car did lack power on the way home though, by quite a bit.

A few hours later I get in my car to go to the gf's house, and it does the same thing all over again. Again I fiddle udner the hood, checked the fuel injector connectors, and it started back up and ran fine again. However I did not dare drive it cause I don't want to get stranded in the middle of the night.

Im running a d16y8 with a p28 ecu and a vafc spliced into an obd2-1 harness. I have had major issues with low RPM sputtering which I have been trying to troubleshoot for sometime now. The engine was not the original in the car, the original was a non-vtec, so when I swapped the engine, I swapped the harness. However the sputtering was happening way before that.

This setup has been running good for over 2,000 miles now. The vafc has absolutely no adjustments made to it, it is simply monitoring things at this point.
The engine harness had some soldered connections made, many at the fuel injectors and some where a vafc was spliced into it before.

Anyone have any suggestions on what to look at? Im going to switch ecu's tomorrow to the stock obd2 ecu and see if anything is different. At least I will be able to eliminate the ecu and the vafc from the equation. Id love any help anyone can give me!

Chris

Cliffnotes:
CEL 16
No recent changes to engine
problem is intermittent
 

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'91 CRX Si
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mine threw the exact same code and had a sputtering problem when i had my thermostat engine harness ground not connected good. id make sure that connection is very clean and tight
 
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oh boy... a misfire can be a hard thing to diagnose, but it *could* mean a distributor (ignitor inside) going bad. But you have to eliminate all the cheaper possibilities first, like rotor, cap, plugs, and wires... that's the great thing about OBD2, it'll tell ya what cylinder is missing
 

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Cool User Title Here
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Discussion Starter #4
SilentWrath* said:
my thermostat engine harness ground
That is fine as it is

bbarbulo said:
that's the great thing about OBD2, it'll tell ya what cylinder is missing
Unfortunately I was not running my obd2 ecu then, I am now. And oh yeah, it started up just fine this morning. But my car has no power!!!
 

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so you've had this engine all along and it's done this? Have you checked out your fuel injectors? Maybe one of them is not firing at low rpm cause it's going bad, hence some hesitation/misfire-like symptoms. The solenoid could be sticking or something. Check the resistance through them... i don't have my helms in front of me so I can't say what it should be.
 

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how about your fuel pressure? At idle, you'll have full vacuum going to the fpr, which will be the lower end of your fuel pressure. Perhaps there's not enough fuel pressure getting to the injectors...when the fpr sees vacuum it's opening WAY to wide. It's going bad. You can check by taking off the vacuum hose and seeing if the problem persists... not a good way to run since you'll be wasting more fuel, but a way to rule out the fpr.
 

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the hard-parker
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civic4ges said:
Im running a d16y8 with a p28 ecu and a vafc spliced into an obd2-1 harness. I have had major issues with low RPM sputtering which I have been trying to troubleshoot for sometime now. The engine was not the original in the car, the original was a non-vtec, so when I swapped the engine, I swapped the harness. However the sputtering was happening way before that.
that low rpm stuttering problem i've been having too. I have a y8 with obd-2 to 0bd-1 harness and p28 ecu. sometimes it will idle at about 200 or 300. i'm not really sure what it is yet, but i havent had any major problems with it...yet. (knock on wood)
 

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Cool User Title Here
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Discussion Starter #9
Well it happened again this week, so it had nothing to do with any ecu/Vafc issues.

I let the car idle, and pulled the #1-4 injector clips off to see what happened. #1,2 and 4 slowed the car down to almost stalling...while #3 made absolutely no change. The #3 injector clip wires had come loose. Solder and 20 minutes created a permanent fix
 

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nice to see you got it fixed :TU:
 

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the hard-parker
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yeah, congrats man. now you won't have to worry about it again. (knock on wood)
 
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