firing order question
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Mountain Pass
Joined: Oct 2007
Posts: 213
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From: Falls of Rough, KY
firing order question
I bought a 88 f150 that was suppose to have a Mustang 5.0L in it. It does have all the front pulley set-up from the Mustang, but I noticed the firing order was regular truck order not the HO order. The truck idles, and run great now, but I thought I would swap it, and check to see if it would run better on the HO order. But, it did not at idle, I did not drive. I idled rough, and smelt rich.
Does the timing need to be checked, and set again after doing this? Or, is it that they might have installed a truck cam in the Mustang motor?
Thanks, Jon
Does the timing need to be checked, and set again after doing this? Or, is it that they might have installed a truck cam in the Mustang motor?
Thanks, Jon
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Mountain Pass
Joined: Oct 2007
Posts: 213
Likes: 0
From: Falls of Rough, KY
Yeah, I was told it was an HO motor, but it wired as a regular 5.0L. I was mainly checking to make sure.
But, would you have to re-time it after the wiring change to make sure? Or, is the timing corect no matter what?
But, would you have to re-time it after the wiring change to make sure? Or, is the timing corect no matter what?
Lead Driver
Joined: Nov 2002
Posts: 9,558
Likes: 44
From: Concord, NC
#1 position does not change and the distributor does not move, so no, the timing would not change by simply swapping the four of the wires around.
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Mountain Pass
Joined: Oct 2007
Posts: 213
Likes: 0
From: Falls of Rough, KY
That is what I thought, but wanted to make sure. So, they must have changed cams in it, as it idles smoother wired regular 5.0. So much for the idea of going Mustang MAF on it without a cam change.
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FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
It's probably a regular car motor... it is pretty hard to tell what you're looking at if the obvious exterior things are missing. You could still put mass air on it though, you'll just have to re-arrange 4 injector wires that's all.
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Mountain Pass
Joined: Oct 2007
Posts: 213
Likes: 0
From: Falls of Rough, KY
I read on fuelinjection.com that it will work that way, but not be right exactly. It has the Mustang front dress on it, alt, PS, and ac(that does not work, and missing parts)
They were idiots that put the truck together. They just threw parts on half way, and did not think things out.
They were idiots that put the truck together. They just threw parts on half way, and did not think things out.
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
Dates are right.. but the firing ordes are reversed, '93 and under trucks use 1542... , '94 and up use 1373...
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
That's only when using individual O2 sensors to feed L and R inputs on the computer, if a single O2 sensor is used to feed both inputs it's not a problem.