After installing my newly rebuilt engine, for some reason it seems like my injectors are flooding the engine everytime I try to start it and are keeping it from starting. I smell gas fumes from the tailpipes and when I take my spark plugs out, they have a little bit of fuel on them. Are the injectors getting the wrong signals somehow? Any ideas?

 

What model? If its an n/a, than it sounds like you have the injectors in the wrong places. They need to be switched around.

 

Its an '86 GXL n/a. I bought my new engine from Atkins Rotary and also bought the installation video. In that video he said that the injectors are all the same and that if you switch the primaries with the secondaries, its like putting almost new injectors in there because the secondaries dont get used as much as the primaries. Are they not the same? Would that make them malfunction?

 

Theyre not the same. One set is bigget than the other. Heck, you may have a primary and a secondary running together. I dont have a n/a, so I dont know how to identify them, or which holes they go in. I would assume the bigger ones go in the secondaries. All 4 of mine are the same, so I cant goof it.

 

Maybe thats the problem. Good idea. I'll try that and let you know. Thanx!

 

Actually, on NA's they are all the same 460's. 550's for Turbo's.

 

Really? I thought n/a's used 2 different sizes.

 

Really. BoyScouts honor.

 

The primary and secondary injectors are exactly the same size. This is true for both NA and TII. TIIs have 550's all the way around, NAs have 460's all the way around.

His engine sounds to be flooding because of leaking or stuck injectors.

 

Actually, they ARE two different sizes because I switched my injectors and it fired right up!! No hesitation. Also, when I had the injectors all out, I held them up together and could tell that the secondaries ARE bigger. They have a slightly bigger nozzle end. Thanx Tony! That was the problem!!

 

Freak coincidence of misinformation? I guess so.

Whatever it was im glad its running right!

 

No FC came from the factory with different sized injectors, so someone has replaced the secondaries with larger ones. Without changes to the ECU, this would then cause the engine to run very rich above 3800rpm. Do you know if it has a reprogrammed ECU, or does it have a fuel controller of some kind?

The cause of your problem is now obvious, and it wasn't the different injector sizes. Because of the swapped plugs, the ECU was trying to start and run the engine on the secondary injectors (instead of the primaries). These are firing into the runners that are fed by the secondary throttles, which are closed until about 1/4 throttle! No airflow in those runners would mean the fuel would just be squirted onto the runner walls and dribble into the engine, flooding it.

 

No, they are not different sizes. NAs have 460s all the way around, TIIs have 550s all the way around. If you don't believe me, check the parts manual.

Sounds like one of your primary injectors is stuck...