Strange Behavior When Trying To Set Base Timing
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Semantics. All engines with throttles have vacuum, and engines with computer-controlled ignition use a sensor to measure that vacuum. Then the computer decides how much advance to put in the timing. So there's no vacuum hose running to the distributor, but it still has vacuum advance.
New User
Joined: Jan 2017
Posts: 4
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Moonley
The computer controls the engine. Like a computer being reset or restarted. If you change the timing the computer will remember the timing it has been running. Thus 100% changing the timing after you reset it. Back to the way the computer remembers it running before changing the timing. If you change the timing in some cases you do have to reset the computer. (adaptive memory). or it will try to run richer and try to fire at the wrong points. Advancing the timing.
often people think they need a new computer. No that is 99% not the case. (Not saying it's not the problem) but most likely not the case. I wish I had a video to post for you but I can't load it up on here.
often people think they need a new computer. No that is 99% not the case. (Not saying it's not the problem) but most likely not the case. I wish I had a video to post for you but I can't load it up on here.
Senior User
Joined: Jul 2003
Posts: 425
Likes: 3
Adaptive memory (otherwise known as "adaptive control" or "adaptive fueling") is for adjusting air/fuel ratio and does not control timing.
This is only your third post on the site, and there is a lot of good information here, so I recommend you read up more in some other threads to learn more about EEC operation and strategy.
New User
Joined: Jan 2017
Posts: 4
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Moonley
[QUOTE=moonley;16889125]That is completely not true. Spark timing is based on tables and multipliers for load, rpm, time, ECT and EGR flow.
EGR has absolutely nothing to do with timing at all that's exhaust back into the engine. How would that effect timing at all. Alot of people disconnect there EGR and there truck runs even better. And spark timing is based on a table graph from distributor and coil or coils.
YouTube video for you. (Setting ignition timing-efi ford\5.0(bronco & f150- how to)). This video will prove I'm not wrong. That grey plug in the video has everything to do with the computer advancing the timing. 100% the computer in some cases will in fact advance the timing.
Sorry I can not give the link to the video simply type: setting ignition timing-efi ford\5.0 (bronco & f150-how to.
That is the closest video I can find to it. And you really don't need a test light. Watch and listen.
I didn't believe it at first either but it's 100% true.
EGR has absolutely nothing to do with timing at all that's exhaust back into the engine. How would that effect timing at all. Alot of people disconnect there EGR and there truck runs even better. And spark timing is based on a table graph from distributor and coil or coils.
YouTube video for you. (Setting ignition timing-efi ford\5.0(bronco & f150- how to)). This video will prove I'm not wrong. That grey plug in the video has everything to do with the computer advancing the timing. 100% the computer in some cases will in fact advance the timing.
Sorry I can not give the link to the video simply type: setting ignition timing-efi ford\5.0 (bronco & f150-how to.
That is the closest video I can find to it. And you really don't need a test light. Watch and listen.
I didn't believe it at first either but it's 100% true.
Lead Driver
Joined: Feb 2013
Posts: 5,006
Likes: 72
From: Roseville, MN
What about MAF? I'm pretty sure that's what my 49-states '97 F-250 460 has. I know for a fact that the timing gets advanced when you plug the SPOUT in at idle. It seems like that has to be related to vacuum / engine load.
And that was my point to the OP over a year ago (who never said if he had MAF or SD). His timing, at idle, with the SPOUT in , of 20 deg BTDC seemed way too low to me.
Senior User
Joined: Jul 2003
Posts: 425
Likes: 3
That video just shows how to time an EEC-IV controlled engine, a basic maintenance procedure that is already well known. Removing the SPOUT connector is the electronic equivalent to removing and plugging your vacuum advance pre-EFI.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
So if someone were to plug the EGR tube there is no way for the computer know. That's where some folks run into trouble with part throttle/low load detonation.
In this scenario there is no way the computer senses EGR flow, but it does advance the timing based on pre-programmed lookup tables.
My input is this based on the previous claims: Yes, the computer controls timing advance and retard function based on sensor input. There is no way it can advance the timing by 180 degrees. Cannot happen ever.
There is no need to clear the adaptive memory when or after advancing the base timing. Urban myth, IMHO.
Cargo Master
Joined: May 2001
Posts: 3,208
Likes: 13
First the distributor needs to be in right. The shutter wheel has a one smaller opening this indicates number 1 cylinder. The distributor has to be installed correctly #1 at approx 1 o'clock for the pcm to know where #1 is to control fuel injection. If this is a remote mounted icm module. Then it needs more then likely a black icm (CCD). If the Egr valve is stuck open they won't idle.
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Something I just ran into
So I recently changed a few parts and while the truck started running better I all of the sudden had a cel appear with 332(erg opening not detected...which I had fixed a while back very painfully) 213 and 311(thermactor not operating or w/e)
well I was beatting my head against the wall and read this thread and another before starting the check process from beginning to end when I found out that the vacuum reservoir is a one way flow and I had miraculously hooked it up backwards and therefore was getting zero vacuum were it was supposed to go... pulled neg terminal to reset codes about to drive it now to see if they persist, I have a feeling they wont since it was after this they showed up in the first place.
That lengthy bit being said I recommend checking all your vacuum stuff including the near impossible to replace vac reservoir as that may play a role in the 213(SPOUT circuit issue, though I don't understand how) I'll post again after this test run to see if it did indeed clear it up...
well I was beatting my head against the wall and read this thread and another before starting the check process from beginning to end when I found out that the vacuum reservoir is a one way flow and I had miraculously hooked it up backwards and therefore was getting zero vacuum were it was supposed to go... pulled neg terminal to reset codes about to drive it now to see if they persist, I have a feeling they wont since it was after this they showed up in the first place.
That lengthy bit being said I recommend checking all your vacuum stuff including the near impossible to replace vac reservoir as that may play a role in the 213(SPOUT circuit issue, though I don't understand how) I'll post again after this test run to see if it did indeed clear it up...
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