Jump to content
The mkiv Supra Owners Club

Oil on 2 spark plugs = Not Good..!!


Havard

Recommended Posts

Looks like I have found the source of my misfire..!!

 

Took everything to bits this afternoon and found a large amount of oil on two of my plugs. The car hasn't been smoking or using a lot of oil but it looks like the thought of a TT conversion is now a reality as my hand is forced.

 

It also looks like the Supra - Le Mans trip is dead for me. It's a Mazda 6 Sport instead..!!

 

To say that I am upset is a slight understatement. Unless someone tells me it's not a lost cause??:eyebrows:

 

H.

Link to comment
Share on other sites

The oil is on the plug side (mainly). There was a tiny amount sat in the plug well on cylinder 4.

 

I am going to have to get my hands on a compression tester and see if it's that. On the plug in cylinder 3 (3rd on e from the front of the car) there was no oil in the plug hole but there was a fair bit on the spark end.

 

I was going to put it all back together and see if ran any better now I have cleaned all the plugs. I paid £107.00 for a set of new plug leads this morning and I don't want to use them if the engine is FUBAR but it may still be a problem with the original leads...?? There was a lot of oil on one of the plugs especially!!:blink:

 

I think from where I am now, compression test, then replace leads and plugs and see that happens from there. The TT conversion is always an option or Mrs H and I have considered breaking the car for parts and starting a fresh??

 

H.

Link to comment
Share on other sites

woo hoo, take it that it isn't misfiring anymore?

 

We have had it out for a 60 mile run or so and no misfire yet. All the original parts are there so I will be surprised if it doesn't return.

 

It looks like the oil was actually of the outside of the plug and it's covered the spark end when I have removed it. It is now looking like a leaky rocker cover but I don't know how long it is taking before it affects the spark plug. Will it get me to Le Mans and back?? That's anyones guess....:(

 

I am still a bit concerned that it's using a lot of fuel but I have been driving it hard trying to get it to play up again.

 

Does anyone have any pictures of new v's used 02 sensors. I think I will invest in some new ones this week or perhaps just do the lemon juice thing. If the 02 sensors are Fubar, do they show up as a fault code??

 

H.

Link to comment
Share on other sites

It is now looking like a leaky rocker cover but I don't know how long it is taking before it affects the spark plug.

 

 

if you haven't done so already it is worth nipping up all the 10mm(?) bolts on the cam covers go steady mind as they only need a light torquing......

Link to comment
Share on other sites

I had this on cylinders 5 and 6 a while back. I worried quite a lot when I looked it up online (the double-edged sword of the interpipe!), but it turned out to be just the cam cover seals. About £20 on parts and a bit of labour and all was well in the world again!

Link to comment
Share on other sites

forget labour! cheaper doing it yourself... isnt exactly rocket science is it. Take two covers off, clean up, put new seals on, covers back on and away the lads!

 

I'll have a look at this after the Le Mans trip. I am thinking of just fitting the new plug leads now as I am not convinced that the oil was the source of the problem.

 

There was only a couple of mm in the plug recess so I would be surprised if this was affecting the plugs..!!

 

H.

Link to comment
Share on other sites

Dont forget the rubber seals that go on the bolts, the seal is built into the washer and will also need changing, youll find the cam cover seals will have gone very brittle and hard so tightening them down will only be a short term fix if any at all.

 

Just done mine and took a couple of hrs with the hardest part being getting the cam covers free, youll need a rubber mallet and some gentle ;) encouragement if there stuck on like mine were.

Link to comment
Share on other sites

Dont forget the rubber seals that go on the bolts, the seal is built into the washer and will also need changing, youll find the cam cover seals will have gone very brittle and hard so tightening them down will only be a short term fix if any at all.

 

Just done mine and took a couple of hrs with the hardest part being getting the cam covers free, youll need a rubber mallet and some gentle ;) encouragement if there stuck on like mine were.

 

Thanks Dunk,

 

I'll leave this till I get back from Le Mans. The car is going to road tested every night this week (50 mile or so) in order to see if the problem returns. One night this week I'll fit the new leads and hope for the best. It's either the rocker cover or the old leads breaking down, as long as I keep an eye on it then we should be ok..!!

 

H.

Link to comment
Share on other sites

Thanks Dunk,

 

I'll leave this till I get back from Le Mans. The car is going to road tested every night this week (50 mile or so) in order to see if the problem returns. One night this week I'll fit the new leads and hope for the best. It's either the rocker cover or the old leads breaking down, as long as I keep an eye on it then we should be ok..!!

 

H.

 

Have a nice trip and fingers crossed you have a trouble free run to Le Mans and back :)

Dont forget to check your oil level before you go, mine didnt leak down to the plugs but to the back of the block and it was losing quite a bit.

Link to comment
Share on other sites

Have a nice trip and fingers crossed you have a trouble free run to Le Mans and back :)

Dont forget to check your oil level before you go, mine didnt leak down to the plugs but to the back of the block and it was losing quite a bit.

 

The oil seems fine. I'm going to strip it all down one night this week again and see if there is any oil in the plug recesses. Fingers crossed..!!

 

Could you possibly make a road test trip down here and have a Pancake? ;)

 

Next weekend may be a possibility. It's having a full run every night this week but I will give it a proper 200 miler at the weekend.

 

It's going to do 1200 miles during the Le Mans trip so I'm going to be worried all the time no matter what happens this week..!!:(

 

Could be worse I suppose..!!

 

H.

Link to comment
Share on other sites

It's going to do 1200 miles during the Le Mans trip so I'm going to be worried all the time no matter what happens this week..!!:(

 

Could be worse I suppose..!!

 

H.

 

My, aren't we the cheerie chappy these days :rlol:

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. You might also be interested in our Guidelines, Privacy Policy and Terms of Use.