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View Full Version : My injectors have already been replaced?


Torchred96
11-10-2011, 04:35 AM
In my focus to get the engine torn down and get the secondary throttle valve system taken out, I didn't notice that my primary injectors have been replaced at some point (the secondarys look to be original) The primary injectors look to be exactly like the Accels that I just bought (they could be a different brand that look exactly the same though). I am going to put the new Accels in, but seems a waste if the ones in the car have been replaced already.

Do the Accels go bad like the original ones did? I have no way of knowing when they were replaced, the car has 133k miles on it.

Is there any way to check those injectors so at least I could sell them or have a set of 8 spares?

The symptoms for the car were horrible stumble/misfiring on hard acceleration, but if I accelerated lightly, it would "come on the pipe" so to speak...albeit, I'm sure it wasn't the full power that it could have, it would break into a nice smooth hard pull. Car also has a misfire at idle which makes it sound like a knock which i've described before but as you all have pointed out to me, it's probably a misfire and the flywheel making that noise.
Looks like one of the coils was replaced at some point, it's different than the rest, no numbers on the top. I am going to replace them all with factory originals if I can find them, and if they aren't prohibitive.

VetteMed
11-10-2011, 07:18 AM
When I bought my current '91, the PO had replaced the injectors with Accels. While the car ran well enough, when I replaced the injectors for my own peace-of-mind, there was significant rust on the inlet screens and o-ring flange of the injectors. Not saying that yours will be rusty, but just pointing out that no set of injectors is going to last forever.

Ethanol is what kills the OEM injectors -- the Accels are likely impervious to that.

PhillipsLT5
11-10-2011, 09:47 AM
http://www.zr1specialist.com/HAT%20Web/articles/Measuring%20Fuel%20Injector%20Resistance%20with%20 the%20Plenum%20in%20Place.pdf