Possible bad intake manifold gasket?( Long post)
#1
Possible bad intake manifold gasket?( Long post)
Hello All, I have a 98 F150 4.6(W) with 225,000+ miles on it. 2 days ago going to lunch the truck started missing real bad. CEL started flashing then stayed on. Pulled a code P0303 Misfire cylinder 3. Pulled the #3 plug and it was wet with anti-freeze( plugs and wires 2 months old).The truck does not blow white smoke and the oil is clean.I did the old test of starting the truck cold with the reservoir cap off and no bubbling or shooting out anti-freeze so I don't "think" it's a head gasket but maybe a intake manifold gasket. Any thought's or suggestions would be appreciated. Also is this hard to replace for a DIY'er ?
#2
if it was #4 i would guess intake gasket, but being #3 i would do a leak down test and a coolant system pressure test. also. if your boot on the plug is bad, it will let moisture in, although you said it was a/f, so maybe the a/f is migrating toward the #3 but its pretty hard for liquid to run uphill to get to the hole
#3
You might wanna check these lines as well , they have been known to leak - sometimes it's hard to tell .. The only givaway that told me they were is that there will be a small puddle on top of the COP(#4 or even # 3) or there will be a water stain where water has sat there in the past.
Last edited by jbrew; 03-02-2007 at 01:06 PM.
#4
[QUOTE=jbrew]You might wanna check these lines as well , they have been known to leak - sometimes it's hard to tell .. The only givaway that told me they were is that there will be a small puddle on top of the COP(#4 or even # 3) or there will be a water stain where water has sat there in the past.
Mine does not have the COP's just the 2 coil packs. 2 months ago when I changed the plugs and wires I blew out all the plug wells after I pulled the boots and # 3 had somekind of liquid in it so it just might be a heater hose.But can that seep to the end of the plug and get it wet? (at the electrode)
Mine does not have the COP's just the 2 coil packs. 2 months ago when I changed the plugs and wires I blew out all the plug wells after I pulled the boots and # 3 had somekind of liquid in it so it just might be a heater hose.But can that seep to the end of the plug and get it wet? (at the electrode)
#5
if it was #4 i would guess intake gasket, but being #3 i would do a leak down test and a coolant system pressure test. also. if your boot on the plug is bad, it will let moisture in, although you said it was a/f, so maybe the a/f is migrating toward the #3 but its pretty hard for liquid to run uphill to get to the hole
s1037s,Couldn't it leak over #3 ?
s1037s,Couldn't it leak over #3 ?
#7
[QUOTE=Lou Colmo]
Oh duhh, My bad .. I was thinking you had COPS
Originally Posted by jbrew
You might wanna check these lines as well , they have been known to leak - sometimes it's hard to tell .. The only givaway that told me they were is that there will be a small puddle on top of the COP(#4 or even # 3) or there will be a water stain where water has sat there in the past.
Mine does not have the COP's just the 2 coil packs. 2 months ago when I changed the plugs and wires I blew out all the plug wells after I pulled the boots and # 3 had somekind of liquid in it so it just might be a heater hose.But can that seep to the end of the plug and get it wet? (at the electrode)
Mine does not have the COP's just the 2 coil packs. 2 months ago when I changed the plugs and wires I blew out all the plug wells after I pulled the boots and # 3 had somekind of liquid in it so it just might be a heater hose.But can that seep to the end of the plug and get it wet? (at the electrode)
Oh duhh, My bad .. I was thinking you had COPS
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#8