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97 Ford F150 "Blue Smoking"
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MrMustang93
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Nov 26, 2009, 10:40 AM
Post #1 of 14
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97 Ford F150 "Blue Smoking"
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1997 Ford F150 4.6L V8. I just bought this truck like a couple days ago. I just got my tags yesterday and I did a tune up and oil change. I drove it today and I started noticing blue smoke while idling, but The smoke would stop whenever I took off and got the rpm's up, but would start back whenever I stopped and idled. When I start it first thing in morning it doesn't smoke. it seems to smoke only when the truck reaches normal operating temp when im idling. what could this be?? an injector??
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Hammer Time
Ultimate Carjunky
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Nov 26, 2009, 12:48 PM
Post #2 of 14
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Re: 97 Ford F150 "Blue Smoking"
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Those symptoms are indicative of bad valve seals. The guides are likely worn also so replacing the seals only would only be a temporary fix.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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DanD
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Nov 26, 2009, 12:50 PM
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Re: 97 Ford F150 "Blue Smoking"
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Possibly valve seals; I've have replaced valve seals on a number of the 4.6 engines and it has seemed to cure the oil smoke and oil consumption.
Dan.
Canadian "EH"
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MrMustang93
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Nov 26, 2009, 1:38 PM
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Re: 97 Ford F150 "Blue Smoking"
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Those symptoms are indicative of bad valve seals. The guides are likely worn also so replacing the seals only would only be a temporary fix.
So what else do i need to replace with the seals??
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Hammer Time
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Nov 26, 2009, 1:41 PM
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Re: 97 Ford F150 "Blue Smoking"
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To do it right would mean pulling both heads and sending them out to a machine shop for a valve job. It depends how long you plan on keeping the truck. Valve seals can be done on the vehicle and would get you by for a while.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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MrMustang93
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Nov 26, 2009, 1:46 PM
Post #7 of 14
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Re: 97 Ford F150 "Blue Smoking"
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how much do you think im looking at for a mechanic shop to replace the valve seals??
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MrMustang93
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Nov 26, 2009, 1:48 PM
Post #8 of 14
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Re: 97 Ford F150 "Blue Smoking"
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Just make sure no one disconnects your air hose in the middle of the job....
thanks
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Hammer Time
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Nov 26, 2009, 1:55 PM
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Re: 97 Ford F150 "Blue Smoking"
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To R&R the valve covers alone is 3.5 hours and the valve seals add another almost 3 hours so your looking at better than $600.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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DanD
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Nov 26, 2009, 2:04 PM
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Re: 97 Ford F150 "Blue Smoking"
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The flat rate book pays something like 7.9 hours; but that’s doing it as described in the repair manual and removing the camshafts and timing chains. I’ve found a Spring compressor tool from OTC; that allows you to compress the valve spring(s) and remove the rocker arms without removing the camshaft. It cuts the time down by about 4 hours and about a third of the required material.
Dan.
Canadian "EH"
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MrMustang93
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Nov 26, 2009, 7:01 PM
Post #11 of 14
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Re: 97 Ford F150 "Blue Smoking"
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a friend of mine ask me why don't i just buy some heads from a junk/salavage yard. I would but I don't want to buy some then I end up being in the same position that im in now. So do you guys think it would be best to back the used heads or just go ahead and get the seal fixed??
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Hammer Time
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Nov 26, 2009, 7:37 PM
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Re: 97 Ford F150 "Blue Smoking"
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Even if you bought used heads, you would still need to send them to a machine shop first to be checked so you probably wouldn't save anything.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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MrMustang93
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Nov 26, 2009, 8:15 PM
Post #13 of 14
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Re: 97 Ford F150 "Blue Smoking"
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thats what I thought. Thanks alot. Im call and get come quotes tomorrow.
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Loren Champlain Sr
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Nov 27, 2009, 6:51 PM
Post #14 of 14
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Re: 97 Ford F150 "Blue Smoking"
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Mr. Mustang; I'm not sure that I agree with the other responses.  Generally, when valve guides or seals leak, you will get a 'puff' of smoke on initial start up and on deceleration. Have you pulled and inspected the spark plugs for evidence of oil? Are you certain that the smoke is blue, not black? A gas analyzer should answer the question of whether it is fuel or oil. Fuel will show up as high CO. Oil will show as high HC. How many miles on this engine, not that it really matters. Just courious. Check the PCV valve. Check the crankcase breather filter inside the air box. If either is plugged or the PCV is defective, can cause these symptoms.
Loren
SW Washington
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