Hey yall

At 255k, I just replaced the timing chain on my 1991/22re pickup - a HUGE undertaking for me. I got it all buttoned up with no parts left over, and now have the timing light on it. I jumped the E1 and TE1 terminals together in the diagnostics connector, and have it set to 5 degrees BTDC (when I take the jumper out it slides over to about 10 or 12 degrees BTDC, and the idle speed increases slightly).

When I give it some juice I notice that the timing mark on the crankshaft pulley heads waaaaay over to the "left" (i.e. even further out before TDC).

My question is this: Should that be happening? It seems to me that when the throttle speed increases I want to see the ignition timing stay constant and not see such a huge shift just because the RPM's increased. I'm wondering if there is something else I need to do here....

I appreciate any advice.

Watch your fingers.

nolteboy

 

Tempting as it is to insult you for your appearent ignorance, I won't. After all this is the newbie section.

So, you must have some sort of directions for how to adjust your timing correctly. Or you wouldn't have gotten this far. Do you remember the part where it says that the engine should be at idle speed when your checking the mark with your timing light? That's because of what happens when the rpm's rise above idle speed. The timing advances drastically, as it should, to stay ahead of the increasing speed of the pistons during the compression stroke as rpm's go up. If it stayed relatively the same, the spark would be arriving later and later than it should as the engine speed increased. This would be extremely inefficient, and cause for a poorly running engine. Because the fuel wouldn't be getting enough time to burn, and be wasted out the tail pipe.

 

Thanks for the information. I admire your self control, and will return the favor by not speculating on what kind of person would feel the need to insult others for asking questions appropriate to this forum.

My "appearent (sic) ignorance" (which thankfully does not as yet appear to extend into the realm of how to spell simple, commonly used words) has in no small measure been reduced. Thus educated, I will continue to humbly plod along in my newbie-ness.

 

wow! the thread is kinda funny! Not just kinda is funny! Mudhippy is right on the money!
Nolte you are thinking carburetor timing where things are mechanically and vaccuum controlled, with f/i the computer is trying to keep ahead of the changing needs and can modify the spark timing as well as the injector timing and duration. everything is normal and congrats on the timing chain it is a significant undertaking.