Serious Engine Sputter
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Serious Engine Sputter
I was driving my 2002 F-150 w/4.6L when it started idling rough and lost power, not completely, but it started lagging big time. It sputters like an old Pinto but it still idles at a consistant 700 RPM, but it's really rough. The only thing I can think of is that I got something wet when I sprayed degreaser on the engine and rinsed it off earlier that morning. It has had plenty of time to dry off if something did get wet so I really don't get it. And the "Check Engine" light HAS NOT come on so I have no clue.
Could it be a clogged cat?
Did I lose a cylinder? Please say no!
Could it be a coil problem?
What could be causing it?
I changed the fuel filter about a month ago so I know that's not it. I changed the plugs about 3 months earlier with no problems since then so I doubt that's it. HELP
Could it be a clogged cat?
Did I lose a cylinder? Please say no!
Could it be a coil problem?
What could be causing it?
I changed the fuel filter about a month ago so I know that's not it. I changed the plugs about 3 months earlier with no problems since then so I doubt that's it. HELP
Lead Driver
Joined: Jul 2003
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From: Wheatland, Mo
I have heard that these trucks are notorius for having probs after washing the motor. The first I would do is the plugs. The COPs for each plug can get "shorted" and start giving you probs when you get them wet. I think the number 3 and 4 are the problem ones. I am sure someone else will chime in here before long.
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Originally Posted by BillyBob69
I have heard that these trucks are notorius for having probs after washing the motor. The first I would do is the plugs. The COPs for each plug can get "shorted" and start giving you probs when you get them wet. I think the number 3 and 4 are the problem ones. I am sure someone else will chime in here before long.
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if cats clogged you get a code, 5.4 and 4.6s when you washed engine water got into the spark plug wells and shorted a coil unplug one injector at a time until you find one that the engine does not change its rythem. that is your problem cylinder. Replace the coil and plug and be sure to use motocraft platnums. ford mod engines don't like aftermarket plugs. And did you hear a hissing noise from behind engine? The pcv fitting on back of intake is bad to crack just follow your pcv line behind the throttle body until it comes to a elbow and plugs in.
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Originally Posted by fordsmt2003
if cats clogged you get a code, 5.4 and 4.6s when you washed engine water got into the spark plug wells and shorted a coil unplug one injector at a time until you find one that the engine does not change its rythem. that is your problem cylinder. Replace the coil and plug and be sure to use motocraft platnums. ford mod engines don't like aftermarket plugs. And did you hear a hissing noise from behind engine? The pcv fitting on back of intake is bad to crack just follow your pcv line behind the throttle body until it comes to a elbow and plugs in.
I should do your test while the engine is running, correct?
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The more I drive it the worse it runs. I can't get the idea out of my head that it's clogged cats and they are getting more clogged the more I drive it. After checking the plugs it ran worse too. What did I do to this poor beast for it to treat me like this?
Hotshot
Joined: Aug 2002
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From: BC, Canada
A plugged catalytic converter ususally wont cause a rough idle. It will usually just cause a lack of power but the engine wont run really rough.
Like has been mentioned a couple times I think you've got a spark problem, either a bad plug or COP or just water in a spark plug well.
If the check engine light came on there should be a trouble code stored in memory. Does the Hypertech have the capability of retrieving memory codes?
Like has been mentioned a couple times I think you've got a spark problem, either a bad plug or COP or just water in a spark plug well.
If the check engine light came on there should be a trouble code stored in memory. Does the Hypertech have the capability of retrieving memory codes?
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Originally Posted by Racerguy
A plugged catalytic converter ususally wont cause a rough idle. It will usually just cause a lack of power but the engine wont run really rough.
Like has been mentioned a couple times I think you've got a spark problem, either a bad plug or COP or just water in a spark plug well.
If the check engine light came on there should be a trouble code stored in memory. Does the Hypertech have the capability of retrieving memory codes?
Like has been mentioned a couple times I think you've got a spark problem, either a bad plug or COP or just water in a spark plug well.
If the check engine light came on there should be a trouble code stored in memory. Does the Hypertech have the capability of retrieving memory codes?
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I finally got a code
I finally got a code....P0357 = "Ignition Coil G Primary/Secondary Circuit Failure.
Does anyone know what this means? COP? And if so, which COP? Does the letter "G" correspond to a number in the firing order?
Does anyone know what this means? COP? And if so, which COP? Does the letter "G" correspond to a number in the firing order?
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Originally Posted by Racerguy
The 7 in P0357 means #7 cylinder as does the G.
Now I just need to find out why the thing drinks in a one big gulp of air on acceleration and hesitates before it finally hooks up and goes. I just installed an intake and programmer. It doesn't hesitate without the programmer but doesn't have the gains of the programmer either, but it hesitates with the programmer. What gives here? It's a Hypertech, could that be the problem? I want the Diablo...would that be better for a 2002 F-150 w/ a 4.6L?