CIS Question 2.7 v. 3.0SC (79 model)
 

P-listers,

Upon inspecting the CIS system on my rebuilt 1979 3.0SC engine, I discovered the previous mechanic put an entire 2.7 FI system on my 3.0SC engine. I have swapped out the fuel distributor and the WUR to the right model but I still can't get the engine to start or run properly without standing over the engine and manually working the air flow sensor plate and throttle body.

Question: will the 2.7 air flow sensor and throttle body work with the 3.0SC fuel distributor and WUR. I noticed the control plunger in the fuel distributors are slightly different. Do I need to or can I make adjustments to the air flow sensor and throttle body to get this combination to work properly or do I need to find the right model air flow sensor and throttle body as well?

All suggestions are appreciated.
Duane Duclaux
Richmond, VA

I think there's an early-SC ('78-'79) complete FI system for sale on the Classifieds Forum.

bump

Did it run well before the rebuild? Or did you swap the parts after the rebuild? Does this represent "first start" after the rebuild? Are the pressures within spec?

If you don't mind intuition:

The throttle body should not make a difference.
The fuel distributor/WUR match would be significant since the WUR sets the control pressure upon which the distributor relies.
With that setup, you should be able --at least -- to make it run well EITHER at idle or under power.

The engine should run well with the 2.7 FI system. Idle might be a little better and you will probably lose some top end.

But you probably knew all of this.

Did you figure this one out?

Harold, replaced the 2.7 air flow sensor with the 3.0SC air flow sensor -- voila -- started right up!!! I'm sure that more knowledgable folks could make the necessary adjustments, but it was beyong me. -- Duane