my daughters 89 firebird has 2.8, switching from fuel injection to carb.have a carbed engine from 84,how do i get the distributor to work with no computer? i can't seem to find an old vaccum type for this engine. thankyou

 

Welcome aboard thirdgen.org.

Although you're talking about a switch to carb, I moved this from the Carburetor forum to the V6 forum. The V6 guys know their cars, while the Carburetor guys tend to be V8-savvy only.

 

Why not move the fuel injection stuff over to the older carb'd engine?

 

Thats what im thinking. Since you already have all the parts.

What was wrong with the other engine?

 

you get a dizzy for a s10-s15 with no computer

 

Just for reference the EFI dizzy will still work with no ECM, there will only be base timing and what little of a curve there is in the ignition control module. You will not have any ability to have a true advance mechanism or change without an ECM connected to it or a proper vacuum advance dizzy.

Why the change away from EFI?

 

on a v8 the gm icm has a 10* advance at 2,500 rpms over base timing when not hooked to an ecm

im not sur eof the icm in the v6 is a diferent part number or not but it operates in the same manner.
there is no curve its a 10* advance at a set rpm

this can be verified on any car by unplugging the est bypass wire and checking the timing at idle then again at 3500 rpms

 

thankyou for the help

 

the engine was blown,other owner pulled engine and made a mess of the wiring

 

There IS a slight curve in the ICM, hence why you need to match the latency tables correctly in order to have correct timing at the crank to what is being commanded.

Verifiable, by running the engine up in RPM, with the bypass disconnected and watching the advance come in, it will continue to advance (slightly) as RPM climbs.. You can also look at the latency tables used in the $8D code (and maybe $32/$6E), and see that the latency curve is just that, a curve. This used to be an old trick, on some vehicles, switch from one ICM to another and gain a few degrees of timing in the upper RPMs. I don't recall what the specific applications were off hand that had the lazier curve, but IIRC it was between truck ICMs and car ICMs.

 

You will be better off fixing the EFI wiring than trying to find the parts and convert to carb.

 

its not in the icm , its the delay with increase of rpm of the signal from the icm to the ecm then back to the icm

latency tables are used to correct this foir proper commanded timing