initial timing?
Senior User
Joined: Jan 2003
Posts: 236
Likes: 0
Does anybody have a picture maybe of the 91 and earlier spout connector? I know the general area now but still dunno what to disconnect. Id look at the online Chiltons manual but its down at the moment. Really sorry for all the questions....
Cargo Master
Joined: Jan 2004
Posts: 2,512
Likes: 8
From: Cook Forest and Irwin PA
Originally posted by Superdave
quaddriver
>>>>>>warning: if using MAF, dont advance it past spec.<<<<<<
Tell me about this.
I am new to the "newer" Ford trucks and their computer issues.
quaddriver
>>>>>>warning: if using MAF, dont advance it past spec.<<<<<<
Tell me about this.
I am new to the "newer" Ford trucks and their computer issues.
Posting Guru
Joined: Sep 1999
Posts: 2,297
Likes: 1
From: Indiana
quaddriver
Well, hmm.
I nudged the base timing up to 15 degrees BTDC on my 95 302, and it has noticeably more power than it did at 10 and the fuel mileage is up a bit also.
Would my truck have this MAF then?
Well, hmm.
I nudged the base timing up to 15 degrees BTDC on my 95 302, and it has noticeably more power than it did at 10 and the fuel mileage is up a bit also.
Would my truck have this MAF then?
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
Originally posted by quaddriver
ok, the 'MAP' or speed density trucks (92 and older) used 2 drivers for the injectors and fired 4 at a time, 4 times each 2 revs -its multiport, its pretty good, but could be better. Around 92 on the lightning and 93-on (I think I have the dates) the truck went to MAF. Pre-96 and OBD2 and a crank position sensor, the spark timing was used to set a base for the injectors because along with MAF came SFI. If you advance (or retard for that matter) then you will affect injector pulse timing.
ok, the 'MAP' or speed density trucks (92 and older) used 2 drivers for the injectors and fired 4 at a time, 4 times each 2 revs -its multiport, its pretty good, but could be better. Around 92 on the lightning and 93-on (I think I have the dates) the truck went to MAF. Pre-96 and OBD2 and a crank position sensor, the spark timing was used to set a base for the injectors because along with MAF came SFI. If you advance (or retard for that matter) then you will affect injector pulse timing.
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Fleet Mechanic
Joined: Aug 2001
Posts: 1,526
Likes: 0
From: Round Rock, TX
MAF didn't come until '95 on most of the engines, so they were still bank-fired until then. Except for the Lightning trucks. Also, MAP does not equal speed density; all of the EFI (even the Power Stroke diesel) vehicles on the road have MAP sensors.
But yeah, don't advance the timing too far unless you really know what you are doing. More advance means higher cylinder temps and leads to detonation.
But yeah, don't advance the timing too far unless you really know what you are doing. More advance means higher cylinder temps and leads to detonation.
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
MAP is the dominant sensor in speed density systems, and they are commonly referred to as a MAP systems. MAF vehicles have a BAP sensor instead of a MAP. There is no difference in the sensors themselves, but the MAP is for manifold vacuum, and the BAP measures ambient air pressure. Lightnings are sequential injection stock?
New User
Joined: Sep 2003
Posts: 19
Likes: 0
From: Saskatoon, SK
My timing was set at 15 degrees advanced and I got a lot of pinging from the engine. Once I put it back to 10 degrees all was well. Can someone tell me why my truck would be different from the other guys with 5.0s?
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
If it runs well with no pinging, I'd leave it. I've always been told to advance it as far as you can without making it ping for best power and economy. I couldn't get more than 12 degrees or so on my truck before it pinged.