Spark plug gap...TFI question
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New User
Joined: Jan 2003
Posts: 17
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From: Billings U.S.
Spark plug gap...TFI question
Does anyone know what the plug gap should be 93/5.0? My Chiltons says.044, sticker under the hood says .052-.056. I just pulled a plug (new-I didn't put them in, though), and they are set at .039?
Also, I noticed the TFI is not mounted on the distributor, what year did they stop doing that? I know my 91 is on the dist., and just assumed it was there on the 93.
Thanks for any input.
WB
Also, I noticed the TFI is not mounted on the distributor, what year did they stop doing that? I know my 91 is on the dist., and just assumed it was there on the 93.
Thanks for any input.
WB
Elder User
Joined: Oct 2002
Posts: 573
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From: Medina, Tn.
Spark plug gap...TFI question
I think that most 5.0's use .44 gap. My 89 does and I remember reading somewhere in this forum that all 5.0's do as well.
Can't help you on the module question though.
Can't help you on the module question though.
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
Spark plug gap...TFI question
They moved the TFI in 92 to the driver's side inner fender to help reduce heat related failures of the TFI module. The module is still sitting in a huge heat sink over on the fender.
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New User
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From: Billings U.S.
Spark plug gap...TFI question
Thanks guys. I'll re-gap this weekend. What running problems, if any would you get if they are gapped too narrow?
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Spark plug gap...TFI question
There is a miss and loss of power at higher rpms. BTW - I noticed in my Motor repair manual that it also says to use the sticker over its own specs.
Since you are doing the plugs... I can't resist: try the AC Delco Rapidfires or the Bosch 4 prong platinums, maybe the triple prong platinum Splitfires, and 8MM or better premium wires. Get an MSD 45KV coil (Accel or whatever brand name that makes a drop-in 42KV plus coil for your 5.0).
Might be a tad pricey, but you'll think you have a new truck when you stomp on it!
Since you are doing the plugs... I can't resist: try the AC Delco Rapidfires or the Bosch 4 prong platinums, maybe the triple prong platinum Splitfires, and 8MM or better premium wires. Get an MSD 45KV coil (Accel or whatever brand name that makes a drop-in 42KV plus coil for your 5.0).
Might be a tad pricey, but you'll think you have a new truck when you stomp on it!
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Senior User
Joined: Jan 2003
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From: Omaha, Nebraska
Spark plug gap...TFI question
Originally posted by steve83
Those gimmick spark plugs are a waste of money, time, & gas. Stick with conventional Autolites.
Those gimmick spark plugs are a waste of money, time, & gas. Stick with conventional Autolites.
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
Spark plug gap...TFI question
I agree 100% on the "gimmick" plugs. The set of Bosch Platimuns I bought have actually been worse than the Champions I have run in every other car I ever owned. Some things are just better done the old fashioned way.
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Joined: Sep 2002
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Spark plug gap...TFI question
You guys must not be doing it right!
I've done the same thing on AMCs, Studebakers, Chryslers, GMs, Fords, Volvos, Triumphs and all showed a definite improvement over the stock ignition setup.
Now, if you are saying the premium plugs don't do much all by themselves - other than the benefits expected from installing new plugs - I might give an inch on that. But as part of a total ignition upgrade, the premium plugs do provide better high rpm performance than stock copper styles.
Try it!
I've done the same thing on AMCs, Studebakers, Chryslers, GMs, Fords, Volvos, Triumphs and all showed a definite improvement over the stock ignition setup.
Now, if you are saying the premium plugs don't do much all by themselves - other than the benefits expected from installing new plugs - I might give an inch on that. But as part of a total ignition upgrade, the premium plugs do provide better high rpm performance than stock copper styles.
Try it!
