OK heres the story. I have a 98 Eclipse RS and whenever i drive far for like more than 30 minutes it starts hesitating and leaves a cloud of grayish blackish smoke. The accelaration also decreases real bad. I checked the plugs and they didnt seem like they had oil on them. They had some kinda white deposits on them but thats about it. The compression read 183-178-183-183. So the compression seems fine what could be causing it to do this?Thanks for you help in advance.

 

it to me sounds like ur rings could b just starting to go bad and not letting any oil through yet but the white build up on the plugs is carbon and actually that might just be u have to mutch carbon build up on ur plug for it to spark. ur compression rate shows it is only in one cylynder im guessing number 2. just some things to think about!!!!!

 

i think i might be wrong on this but arent turbo dsm's compressions usually that high?

im thinking the samething as tommy tho. rings...

 

i thought if the rings where bad that the compression would be low. I think thats right aroung what it should put out. Im not in town so im going to change the plugs when i get back and see whats up. If anybody else has any imput let me know. Also the car isnt turbo.

 

you might have a sticking injector, its probaly dumping fuel.

 

anybody else have a similiar problem?

 

Does anybody think it could be the valve guides? I think thats what they are called.

 

i put some bardahl stop smoke and that appears to have helped it out some.

 

On the contrary it sounds like you are leaning out real bad. After driving for 30 minutes? If it's really that long I Can't think of what will cause that, but if it's really less than that, then it might have something to do with when the car switches to open loop, so maybe something in the EGR is metering correctly? Just a guess.

If you are leaning out so bad as to cause white spots on the plugs and hesitation, you are going to cause serious damage to the engine soon! So be careful.

 

Start with fuel filter and plugs. Quick, easy, and cheap, and should be replaced as a maintenance thing anyway. Sounds like it has been running lean for a while (possibly clogged fuel filter), and that would mean higher exhaust temps, and debris being burned from the converter (black smoke). Compression numbers look fairly good (stock turbo numbers are usually around 160, and I think the N/A is only abount a point higher).