To most, probably a dumb question; not to mean the answer is "yes" or "no" automatically.

Maybe I can explain why my question here --"is timing required"?

I have a Haynes tech manual and it specifically states for the year covered by the manual that timing isn't required.....because the computer takes care of that. Now, I don't think Haynes meant that if one is putting an engine together the initial timing isn't important but from that point on I believe that they intend for their statement to apply.

I am not a practicing mechanic but I thought about Haynes comment and saw no reason to argue because:


The engine control module (computer) does indeed make adjustments based on sensor input.

Also, even if there is wear in the timing chain, etc., that would be systematic variance and the computer can correct for systematic errors. If there is random error in engine timing, maybe not; but equally important is to understand that setting the distributor by conventional timing cannot account for random error either. Hmmmm, could leave me in consternation.

But I raise the subject because;

In discussion with two practicing mechanics, with a lot of experience, both took issue with Haynes statement. Both professional mechanics said that the timing should be checked and reset according to the check requirement. They intimated that the computer could not ensure correct timing. Hmmm.

I suppose the critical requirement here is to insure the reference timing is close and the conventional check/adjustment method would bring it closer to engine requirement--- hence relying less on the computer. That is probably where the two pros were coming from? Which means to a degree (no pun intended), both sides are correct, Haynes and the two pros.

Anyone have any thoughts that would cover this question with better clarity, because I am not a pro?

 

Did I miss the part about what kind and year of vehicle you are discussing?

 

Haynes manual that states timing isn't required applies to duraspark III and EEC IV equipped E150's.

The manual covers 79 thru 91 models but not to imply that all those are equipped with with this ignition spark and control.

 

General rule. If it has a distributor, You have to set the timing.

 

Ok, you are saying do a timing. That I will attempt to do.

I work from my Haynes manual and since they indicate it is not required there are no instructions; how to hook up, rpms, what to disconnect, maybe setting, or anything --logical I agree understanding their position.

Would you be able to give me instructions? 302, EEC IV, Duraspark III, E150.

Thanks for your patience.

 

Hook up timing light to battery and #1 spark plug wire. Mark crankshaft pully so you can see the 10 degree line. Disconnect spout connector, little grey connector near ignition module, looks like a piece of platic plug stuck in the connector and has no wires coming out the other end, it is just a jumper that takes the computer timing control away so that you can adjust timing by loosening the distributor and turning it until you line up the 10 degree mark with the indicator on the block.

 

Thank you for the instructions. Looks like I am good to go (this weekend) if I can locate and get the computer out of the loop by pulling the little plastic thingy out. Also, hope I can turn the distributor and still observe the mark, assuming an adjustment is required (probably is at its age/milage). Maybe a friend will drop by, wouldn't that be nice?

 

yes it is for sure if you want it to run right