Injectors

[stealthe]

I went to start my car and she wouldn't turn over but noticed fuel spitting out from the valve cover. I removed the cover, and saw that the #4 injector was dumping fuel. I went ahead and replaced all four injectors, as well as the pressure regulator, and I still had the problem. I went and removed the new #4 injector, and replaced it with the old one thinking the new one might be faulty, and it is still dumping fuel. why is it doing this? Is it something electronic? The distributor module to the injectors? please help

[BabaGenushe13]

i had this happen on injector 2 on my motor. have you tried checking spark to that cylinder it may not be igniting the fuel. if not that then try swapping an injector from another cylinder. and if it continues(and you know the injector is good) the wire could be grounding somewhere keeping it open. i changed my ecu and that helped but it comes and goes.

[stealthe]

Checked and there is spark to the cylinder. Swapped it out with another injector and it's still dumping fuel. Wouldn't think it was the module in the distributor since it would probably affect all of them. The only thing I can think of now is the wiring either grounding somewhere like you said or its just a bad wire.

[compactfean]

Unplug the injector plug. If that stops the injector from pissing every where than your ecu is bad, or the wire that goes from injector to ecu is grounding somewhere.

[BabaGenushe13]

yea the crank angle sensor in the distributor is probably not the issue. and unpluging the injector should stop the fuel from dumping. another thing to account for is sometimes the actual injector clips wear out and the connections touch which in turn will ground and leave the injector open. try the different injectors in the bad spot and see if that solves the issue. if not try and change the connector. also what kinda fuel are you running? i know i ran 89 for years and put 87 in it on accident it started having injector trouble, now all i run is 92 or 93 and changed the clip on the bad cylinder, havent had trouble so far

[stealthe]

Well I pretty much narrowed it down with the injector problem. It looks like it's a wiring issue. With the key off I'm still getting juice to the #4 injector and not the other ones. It looks like it could be grounded somewhere or just shot. Problem now is tracing those wires to wherever the hell it goes and I'm assuming it's the ECU and fixing it,or just ripping out the entire ground and hot wire and replacing it. If anyone knows where those wires run to I would greatly appreciate the help..thanks

[compactfean]

All 4 injectors have a common power and the ecu grounds each injector individually. Id start by getting an ecu pin out.

[stealthe]

Thanks..I will try that. Why in the hell did the Japanese love so many grounds? lol it seems like there are more ground wires than live.

[stealthe]

ok..now with looking at the wiring to the injector #4 which is of course wrapped in housing and taped every frickin where..do I need to just undo the whole housing and get down to bare wire to check or is there an easier way. It makes me tired just looking at it. I see where it splits off and runs to the ECU and the other runs up to the battery,headlights,etc

[compactfean]

The power wire, as long as you have 12 v than that one is fine. The other wrire you can check with a millimeter for continuity but I am not sure if that will help because it might be grounding somewhere else. I would try a known good ecu first, and if you have the same problem than run your own wire from injector to ecu.

[stealthe]

Yeah both wires have juice so it's definitely grounding somewhere. That was gonna be my next move, running two new wires directly from the ECU to that injector. I could possibly leave it that way if it works,but I don't want that short, or where it's grounding somewhere, to become worse.

[moso]

personally I would unloom it at this point just to stop any further harness damage from happening. you can fix the injector wire and whatever other wire(s) that have become damaged. the harness really isn't that big and so long as you zip tie it up while your taking off the old looming its fairly easy to rewrap. expect sticky fingers.

[stealthe]

Well I ran a new wire from the ECU to the injector, and all is well. There is an obvious ground somewhere in the harness so without undoing it entirely to look for it,I'm just gonna run a whole new wire from the ECU to that injector. Thanks for everyone's help.

[compactfean]

No problem, moso does have a good point. When you have the chance id pull that harness out and find your issue because most likely where that wire is grounding .....there will be others to do the same thing soon. At least you can drive it for now though.

[stealthe]

Ok now, here we go...Got everything back together and started. Now it seems to be spilling oil out of the valve cover back where the #4 injector and cylinder is. She's smoking big time and running rough. I'm guessing there's too much pressure in the crankcase. Is it the valve stem seals?