#4 cylinder misfiring (twice now)
#1
#4 cylinder misfiring (twice now)
My 2000 4.0 is misfiring again. Put new plugs and wires to solve the original prob. Then 3000 miles later it started missing again. Scanner said misfire detected on #4 cyl. so I replaced the plug (couldn't see anything wrong with it) and solved the problem again. Now again at around 3000 miles it's missing again. I'm using MC double plats. Anyone have any suggestions?
Thanks, David
Thanks, David
#2
I had the same problem as did another friend of mine.
The friends truck had the heads replaced under warranty twice and it still did it. I believe the problem was hairline cracks.
Mine on the other had seems to have had a pinhole leak in the head gasket. I had it foul two plugs and I noticed it drinking a little water. So I tossed in some of that radiator stop leak crap (you know, the saw dust and sand, lol) and it stopped. Haven't fouled a plug since and haven't really used any water. Don't know if that had anything to do with it but it worked either way. Knock on wood.
The friends truck had the heads replaced under warranty twice and it still did it. I believe the problem was hairline cracks.
Mine on the other had seems to have had a pinhole leak in the head gasket. I had it foul two plugs and I noticed it drinking a little water. So I tossed in some of that radiator stop leak crap (you know, the saw dust and sand, lol) and it stopped. Haven't fouled a plug since and haven't really used any water. Don't know if that had anything to do with it but it worked either way. Knock on wood.
#4
#5
take the spark plug out and look inside the cylinder for coolant. Also look at your tail pipe, is steam coming out? if so get some on ur hand and taste it, sweet its coolant, otherwise just condensation. However what you can also do is run the truck for a bit, turn it off, take out that plug, and then try to crank it with the plug out, should spray coolant out if there is any in there (watch out sprays 50 feet in the air)
#7
#8
Originally Posted by ringer4x4
who does used oil analysis? interested in it...expensive?
http://www.blackstone-labs.com/gas_engines.html
#10
#11
#12
Originally Posted by ringer4x4
my friend told me still doesn't elimitate the possibility of burning coolant though...just if leaks into the engine oil
Last edited by Rockledge; 06-21-2007 at 02:49 PM.
#14
If a Ford dealer can't find any signs of an external leak, and if your UOA shows no signs of coolant in the oil, then I think the logical conclusion has to be that the coolant is getting burned up in the cylinders. Half a radiator's worth of coolant has to be going somewhere.
Troubleshooting often involves eliminating possibilities. The UOA will help you do that (at the very least).
Troubleshooting often involves eliminating possibilities. The UOA will help you do that (at the very least).
#15
#17
dropped off ranger today at dealership... oil analysis also says possible cylinder wear..rad was half empty when i dropped it off ( last time i dropped it off they said they couldn't find any sign of coolant loss) rad was just flushed 2 weeks ago, partly because i put dex cool in it and really wanted to get all traces of it out
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