Engine running rough ('93 302)
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From: Northwest FL
Engine running rough ('93 302)
So, my 302 has been running rough for a while now, & I've tried almost everything I can think of that would cause it, with each parts replacement making it a little better, but not actually fixing it. I replaced the plugs & wires less than a year ago, then more recently I've replaced the air filter, IAC valve, fuel filter, EGR, Oxygen sensor, tried a new MAP sensor, & did the distributor cap & rotor this morning. Other issues have fixed themselves in the process, but I still feel a light miss while driving (especially around 1500 RPM) & roughness while idling probably about 80% of the time. Just want to see what suggestions y'all have. I plan on pulling plugs later today & checking them out, but I'm running out of ideas. I've pulled codes, only got the "111" all clear code, & I figure the engine running test would've caught the TPS if that was the issue.
Fleet Owner
Joined: Oct 2005
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From: Kentucky
Make sure the plug wires are properly routed and separated to prevent cross-fire. A Ford TSB from Steve83 on the subject: 1987-93 5L Plug Wire Routing
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New User
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From: Northwest FL
Make sure the plug wires are properly routed and separated to prevent cross-fire. A Ford TSB from Steve83 on the subject: 1987-93 5L Plug Wire Routing
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
Be sure you are using the correct firing order: 1-5-4-2-6-3-7-8
1994 and later 5L engines use: 1-3-7-2-6-5-4-8
Not the first time someone has done that. Also a possibility someone installed a later model 5L engine, therefore if you are using the old firing order on a newer engine it will run rough/miss.
1994 and later 5L engines use: 1-3-7-2-6-5-4-8
Not the first time someone has done that. Also a possibility someone installed a later model 5L engine, therefore if you are using the old firing order on a newer engine it will run rough/miss.
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