Tried everything
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Tried everything
Hey guys, This is my second posting within a couple of weeks with the same problem. I have a 1994 F250 With a 5.8 Liter engine with 93K miles. The truck sat for a while so when I decided to fire it back up, I filled the tank with new gas and it would hiccup, missfire, skip etc. I replaced the inline fuel filter, spark plugs, wires, cap and rotor, new throttle position sensor etc. I also ran an OBD1 code reader and no TDC's ever showed up. It's still dropping out, missing or hiccuping while at idle and it misses while driving on the freeway or at idle under gear. Anay ideas?
Thanks....
Thanks....
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parts
I installed Autolite # 24 plugs, the plugs that were in there weren't that old and it ran the same way then. The only part I haven't changed out is the coil, this is getting expensive!! Thanks for your input you guys.
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Joined: Jan 2001
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From: Rural Florida Panhandle
Has it run long enough to get all the crud from the bottom of the tank? If the tank was nearly empty, or had old sour fuel, you may still be burning it. Have you tried some fuel system cleaner in the tank?
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Joined: Apr 2008
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From: Wendover, NV.
Another thing that you could try is to take your truck out to the nearest circle track and take your truck as fast as you feel you can drive it. I had a truck that was doing the same thing after sitting for a long time. I filled it with premium fuel and put it on the track. It almost took the problem completely away. I put in a Mallory coil and that took away the lingering problems.
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Brett Foote
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From: new west b.c
i agree you could probaly have crud in your fuel filter, or pump, your best to run some fuel cleaner intoy our tank and go for a long drive
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Joined: Apr 2008
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Something else
When it spits and spudders, is it also blowing darker exaust and smelling like gas? I am having a little bit the same problem. I also have a post up on it. If you smell a lot of gas, it might also be the throttle position motor. I am going to tap on mine to see if it might free up. Like they said above, a cheap test is a fuel presure test would uncover a failing fuel pump. If you have a dual tank setup, the fuel switch might have a little junk in it. Also a couple or more fuel injectors might have problems. I can't remember the voltage needed to electricly open the injectors, maybe 12 volts but, when you find out then you can open the injectors and use carb cleaner spray to force any particles out of the injectors. Be careful not to cause a spark! Use a remote switch and use electical tape around the connectors on the injector. Might be it.
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additives
Thanks again for all of your input guys, I appreciate it. I replaced the coil and it still has the same problem. I did pour in some fuel injection cleaner, I'll take it for a long run and hopefully it will clear this up and burn up the old residual fuel.
Jerry
Jerry
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Joined: Apr 2008
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From: Wendover, NV.
Another thing that could be the problem is the O2 sensor. They are supposed to be good for somewhere around 100,000 miles. With over 90,000 miles on your truck you are getting close to the lifespan range of yours if it is stock.
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Joined: May 2007
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From: Solon, Ohio
When ever a four stroke engine sits idle for awhile, the valves that are in the lifted position can become slightly stuck and don't properly seat which can give you that miss.
Some times just driving it will clean it up, and sometimes special additives for stuck valves can help, but often you have to have the heads reworked.
Sometimes this shows up with a compression check but many times not.
Each valve turns just a little bit each time it is lifted, and many times it misseats just slightly on each of it's rotations, which gives that telltale slight rhythm to the miss.
A really good experienced mechanic could probably tell by listening to it.
Some times just driving it will clean it up, and sometimes special additives for stuck valves can help, but often you have to have the heads reworked.
Sometimes this shows up with a compression check but many times not.
Each valve turns just a little bit each time it is lifted, and many times it misseats just slightly on each of it's rotations, which gives that telltale slight rhythm to the miss.
A really good experienced mechanic could probably tell by listening to it.
