Rough idle gas burning smell please help!

Gap or no gap, a plug covered in oil suggests you've detonated in that cylinder and have broken the piston and or a valve. A cylinder not firing correctly will cause you to smell rich from the exhaust. There's your smell. The noises echoing through the exhaust is another clue something upstream is not right. A $50 borescope and 5 min of your time is better than $100+/hr for ford to dick you around some more. I only mention it because you were distressed about money in your last post. Good luck man.

Roots-type said:

Gap or no gap, a plug covered in oil suggests you've detonated in that cylinder and have broken the piston and or a valve. A cylinder not firing correctly will cause you to smell rich from the exhaust. There's your smell. The noises echoing through the exhaust is another clue something upstream is not right. A $50 borescope and 5 min of your time is better than $100+/hr for ford to dick you around some more. I only mention it because you were distressed about money in your last post. Good luck man.

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what he said ^ get a bore scope.

Home

Our factory manual is in here

large version for laptop/pc is what you need.
Hard copy is also good but doesn’t have this section of manual

PC/ED section of manual has everything you need to know on how it all works and how to test things


Many threads on here with new owners and issues.

these engines have head issues ,

these low miles cars just haven’t hit the time of use yet. When issues start.

worst part is that issue will just happen out of the blue.

There is a long story on head gasket causing some of these issues along with head design

4 thread original
9 thread 2nd design
Both for me dropped cylinder 6.

60k was about the time on both
Have 200k plus on the new head design

Than some sounds maybe different,
There is a recent thread on a new purchase,car sounded extremely bad

guy added a oil supplement and noises went away. This was after spending many dollars at FORD

good luck

SVTsamson22 said:

is it possible by not having your spark plugs screwed in enough or not straight it could possibly cause theses problems

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Bud, if you are unsure of how to swap plugs, maybe this car is not for you.

I hope it's not a piston the previous owner placed a new head gasket

98 svt said:

Bud, if you are unsure of how to swap plugs, maybe this car is not for you.

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It was the first time I ever changed plugs not ashamed to say it I'm a young guy that has always had someone do stuff for me I'm sick of being a dummy when it comes to a car so I'll ask every dumb question till I don't have to nomore..

SVTsamson22 said:

I hope it's not a piston the previous owner placed a new head gasket

It was the first time I ever changed plugs not ashamed to say it I'm a young guy that has always had someone do stuff for me I'm sick of being a dummy when it comes to a car so I'll ask every dumb question till I don't have to nomore..

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trust me, i went though alot of money and parts thinking it was something simple when it was really not..get a bore scope...

this is what i use cheap and easy

not sure if that link is going to work so heres a screen shot

AFLOCOBRA said:

this is what i use cheap and easy

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I just picked one up the screen quality isn't that great but I'm seeing a good bit of carbon build judging by yours I'm guessing you had melted piston ?

SVTsamson22 said:

I just picked one up the screen quality isn't that great but I'm seeing a good bit of carbon build judging by yours I'm guessing you had melted piston ?

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yessir all due to exposed wire on the COP (coil on pack) harness rubbing the valve cover that caused intermittent voltage drop to the fuel pump starving cylinders 7, 8 at wot..

Im hoping for the best but after seeing the gas oil smell at the end of the spark plugs and weird idle looks like I might be joining the melted piston gang what new pistons did you go with ?

SVTsamson22 said:

Im hoping for the best but after seeing the gas oil smell at the end of the spark plugs and weird idle looks like I might be joining the melted piston gang what new pistons did you go with ?

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CP Bullets

Fix the exhaust leaks, upstream of the O2 sensors. Clear the codes and drive it.

Yes there was a few leaks I noticed a black tar like Substance around it good news is.my headers finally came in the mail after 2 months of waiting bad news the cobra had to piss the bed right before I could install them.

Sorry wrong format.

What?

Worth its weight in gold

98 svt said:

What?

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Nothing butters

Borescoped the heads they checked out fine had it redialed in with a dyno and she's back running good I can sleep well tonight Thanks for all the help now to add more performance parts!