Misfire(s) (First Post!)
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Misfire(s) (First Post!)
Hey all. I recently found (free) an 1986 Ford F-150 Lariat on some property I bought. It's got a 5.0 with AOD. It's been sitting since 1996. Rats lived in the engine bay and some of the wires were all chewed up. I replaced the plug wires plugs. I put a new fuel regulator on (after crankcase filled up with gas, per advice of this forum) There were some injector wires that were eaten through also. I soldered some and wire-nutted others. It runs on, what sounds like 7 cylinders. Maybe 6? Anyhow, I checked the firing order and the plugs. I have it drinking gas out of a coffee can right now because I don't know the condition of the tanks. It drinks it out of the can really really fast. Maybe I have a injector stuck open? How important are the injector wires that I soldered and wire nutted up? I mean, they are making contact. What might cause gas to go down SO fast? I am going to get a stethescope tomorrow and check each injector. What's a new or refurb. set of injectors cost for this truck? Thanks all! Great forum you guys have!
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Joined: Jan 2004
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From: Northwest, Arkansas
Welcome to FTE and all it's glory 
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. You are now part of the largest Ford Community on the net. Glad you chose to register and am sure your stay will be beneficial. Have a good time and see you on the Forums. Besides all the great Tech forums here we also have local state chapters where people from the same area can get together for meets, parties, or just carry on general conversation. Take the time to check out the chapter in your local area.
To make it easier to navigate please read the Forum Guidelines.
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Today I took off the upper air intake plenum and the injector rails and injectors. Not too bad a job after working on a Cadillac! I checked all the injectors. I put 9v to each one to make sure it was clicking and the pintle was coming out. I poured a little gas in each one, put compressed air to one end and got a nice spray pattern out of each one. I put it all back, ran some fuel injector cleaner through it, and it still misfires on 2 cyl. I pulled the plugs off the dist. They were all getting fire, but found the #4 and #8 cylinders (the back 2) don't affect engine performance when the wires are pulled. Doesn't sound coincidential. Maybe somebody knows what to do? I would appreciate any direction. Thanks.
Last edited by ctubutis; Apr 18, 2017 at 02:58 PM. Reason: Remove sig per request
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Joined: Sep 2005
Posts: 252
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From: Illinois
Check for vacuum leaks first. After you pulled the upper plenum, did you replace the gasket with a new one? If not you could have a vacuum leak where the plenum meets the intake. Also, take a close look at your PCV hose. That plugs in at the rear of the upper plenum and, if leaking, would affect the rear cylinders to a greater degree than the other cylinders.
I bought injectors for my 86 302 from Five-O Motor Sport. They are in CA I believe. 19# stage2 injectors cost me $240 plus shipping. I'm very happy with the injectors and the service. www.fiveomotorsport.com
Have fun! I have an 86 that I've been working on since April and it's turning into a pretty good truck!
Ben
I bought injectors for my 86 302 from Five-O Motor Sport. They are in CA I believe. 19# stage2 injectors cost me $240 plus shipping. I'm very happy with the injectors and the service. www.fiveomotorsport.com
Have fun! I have an 86 that I've been working on since April and it's turning into a pretty good truck!
Ben
