Ignition Woes

[351c914]

Okay Guys, I'm back after about a year away. I have a 74 with a 1.8 that is now a 2056. It has the original fuel injection and therin lies my questions. The car runs great but when it gets fully up to temp (oil temp of about 216 degF) and I accelerate, I get pinging. I run Premium (92 octane) with an octane booster which seems to help some. I have checked the distributor and it is advancing per specs, actually a few degrees more that the 914 factory manual states. I'm wondering if at temp and full throttle, I'm leaning out. Should I have installed the 2.0 injectors since I have the larger displacement?

Thanks for your help in advance.

[Dave at Pelican Parts]

Pinging can also be caused by a lean fuel mixture. Try checking the color of the plugs after running like that, or get to a shop that can measure the mixture.

--DD

[351c914]

Dave,

Sounds like we are on the same track. What about my suggestion of going to the 2.0 injectors? What color would the plugs be if lean, light brown?

GS

[Dave at Pelican Parts]

The 1.8 and 2.0 injectors are different enough that you don't want to swap them. I have been told that Bosch used to tell their techs that swapping D-jet and L-jet injectors for each other could result in burning out some of the electrics in the FI.

Perhaps Bus injectors? I'm not sure...

White is too lean, light brown is fine.

--DD

[yoh!!!]

I have checked the distributor and it is advancing per specs, actually a few degrees more that the 914 factory manual states.

I might be confused... but advancing it further than spec - that could result in ping!? Set it a like 5* below spec and listen if it still pings...

At the same time I agree... it is most likely lean due to limitations in its injection system.

Patrick