I bought some used 85.5 or 86 NA injectors for my 86 NA and had them completely rebuilt and balanced by RC Engineering. Now I have the injectors in my car and it won't start.

I noticed that the injectors I removed are black but the ones I bought and had rebuilt are gray. Does this mean they are different and won't work? Any suggestions or info? Thanks.

 

n'as besides the s, s2, and the 2.7 n/a are all the same.

 

I believe (somebody correct me if I'm wrong) that early and late NA injectors are different. One of them is peak and hold, and the other is saturation.
That said, 85.5 and 86 injectors should be interchangable if I'm correct.

 

Hmm, well would the car start if the advertiser was wrong and these are early NA injectors? It sounds like I may have to buy new injectors. The difference in color is telling me these injectors are different and the reason my car won't start...

 

I would check all wires around the injectors to make sure everything is plugged in properly. There are ALOT of connections that could get jiggled when removing the fuel rail. This is what happened to me a while back - turns out it was one of those two black electrical plugs between the intake manifold and the firewall...

 

ChecK all the FPR, vaccum lines too. And the damper. The "color" you are talking about, Is it the top plastic part? If they are not painted the bodys will be bare steel... And will rust.
Compare the Bosch part numbers on the top of the injector and see if they are same.

 

Pull out the voltmeter and measure the impedance on the injectors.

 

With a multimeter, wouldn't he be measuring the resistance of the injectors?
Is not impedance a combination of resistance, reluctance and capacitance?

Sorry, I'm in the middle of an electrical course right now.

 

Sorry for the overt obviousness...but did you reinstall the fuel pump fuse???

 

The injectors have a Bosch part no. cast on the bodies (in very small and hard to read numbers) on a flat strip near the base. Getting these should clear up any lingering doubts. You might need a magnifying glass, unless your eyes are better than mine. You won't be able to see these with with the injectors in the car, unfortunately.

-Mark

 

Resistance and inductance?

The meter will have just resistance and those should match up.

 

If you're measuring one set against another, it would work just fine. But if you're actually looking to find the impedance of the injectors, a multimeter probably won't tell you the correct number.
I'm just being a jerk, don't mind me

 

Sort of OT but are the injectors easy to removed. Do i need any new o rings.

 

You need an injector reseal kit for each injector. about $4 each at partsource.
depressurize the fuel rail, 4 bolts to lift it up, unclip the injector harness from each injector, remove the little clip that holds them on the rail, then pull. It takes about 15 minutes.
It probably takes longer to take the old injector hats off, and install the new ones, and O-rings than it does to remove the rail
Takes even less time to re-install it.