New Accel Injectors, same problem different hole. - ZR-1 Net Registry Forums

tccrab · 09-11-2006

I replaced my fuel injectors because I came up with a miss at lower RPMs, diagnosed primary fuel injector failure, and after measuring them with a volt meter, one was obviously bad and two others were on their way.
Put in the new Accels with the special 'O' rings from Haibeck. Installation was a breeze and everything went back together just as it should. To be honest, I was just a little worried, my first plenum pull and all.

Engine fired right up and became obviously clear that I still had a miss.
Before, cylinder 3 was not firing, pulling it's spark plug wire when idling did not make the idle worse.
Now cylinder 5 does not fire.
Got spark, have ohm'ed the fuel injectors and they're fine, and I don't have a connector that's not seated.
No big obvious vacuum leaks, the secondaries hold vacuum and the idle however rough is under 1000 rpms, so I'm fairly certain it's not a leak.

The miss seems to go away when the secondaries open. Under hard acceleration the motor smooths out and the miss appears to go away.

Taking off from a stop is almost painful, the miss is that obvious. It's not an occasional misfire, it's a dead hole.

I've not yet pulled the sparkplug, this cylinder was firing prior to the fuel injector replacement, and the spark plug wires were replaced by the P.O.'s mechanic.
The motor has 10,800 miles.

I'm playing with the idea of pulling the plenum back off and taking that fuel injector down to the local speed shop to get it flowed. Even though it's coil measures fine, it might have junk in it.
I'd like to have a few more diagnostic tools under my belt before I go yanking the plenum.

Guys, got any hints, helps, ideas, WAG's?
ANY help at all right now would be SINCERELY and thoughtfully appreciated.

TomC
'90ZR1 #792

09-11-2006	#1
tccrab Join Date: Oct 2004 Location: Folsom CA Posts: 1,654	New Accel Injectors, same problem different hole. I replaced my fuel injectors because I came up with a miss at lower RPMs, diagnosed primary fuel injector failure, and after measuring them with a volt meter, one was obviously bad and two others were on their way. Put in the new Accels with the special 'O' rings from Haibeck. Installation was a breeze and everything went back together just as it should. To be honest, I was just a little worried, my first plenum pull and all. Engine fired right up and became obviously clear that I still had a miss. Before, cylinder 3 was not firing, pulling it's spark plug wire when idling did not make the idle worse. Now cylinder 5 does not fire. Got spark, have ohm'ed the fuel injectors and they're fine, and I don't have a connector that's not seated. No big obvious vacuum leaks, the secondaries hold vacuum and the idle however rough is under 1000 rpms, so I'm fairly certain it's not a leak. The miss seems to go away when the secondaries open. Under hard acceleration the motor smooths out and the miss appears to go away. Taking off from a stop is almost painful, the miss is that obvious. It's not an occasional misfire, it's a dead hole. I've not yet pulled the sparkplug, this cylinder was firing prior to the fuel injector replacement, and the spark plug wires were replaced by the P.O.'s mechanic. The motor has 10,800 miles. I'm playing with the idea of pulling the plenum back off and taking that fuel injector down to the local speed shop to get it flowed. Even though it's coil measures fine, it might have junk in it. I'd like to have a few more diagnostic tools under my belt before I go yanking the plenum. Guys, got any hints, helps, ideas, WAG's? ANY help at all right now would be SINCERELY and thoughtfully appreciated. TomC '90ZR1 #792 __________________ TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B]