cant figure out why it's missing
Hello all,
It's an 89 190e with the 2.6...Generally, when this has happened in the past it was just a fouled plug. Well, I fixed the prob with why the plugs were fouling in the first place, I quit burning oil. I don't foul plugs anymore but have new ones in there anyway. I have spark in all wires, New cap and rotor, just changed the fuel filter and it still runs rough and gutless as if it has a fouled plug. :confused: any ideas? |
Did you inspect the ignition coil?
On my 300E the contact point (copper "cup" where the wire makes contact), was corroded to nothing more than green powder. -Strangely enough it still started fine but had very rough idle. Freestyler |
Which plugs? What electrode gap?
Steve |
opossum
If it were my car at this point I would run two bottles of Techron Fuel Injector cleaner through it with less than a full tank of fuel. I would get hot and drive it hard, say in the hills. If that didn't clear it up I would bleed the fuel injector lines at the fuel distributor. A dangerous job >raw fuel on a running engine< but often on older cars seems to help. I did the above on the 190E which ran so poorly I was sure it had severe internal problems. When I bled the injector lines I was amazed at the amount of crud that came out. I did it several times. The 190E now runs very well, lots of power and almost a perfect idle. Keep us posted, Haasman |
thanks guys
steve- bosch coppers at .032.. same as I always have..h9dc I think
freestyler- I will go check the coil wire for crud. haasman_I will also go pick up another bottle of injector cleaner and see what happens...If that is it I have a testimony for using chevron gas because as of lately my wife has been using the stuff from costco because gas has been so expensive everywhere..I warned her.. |
update
I threw in a big bottle of techron (for 20 gal) on 3/4 tank which had previously had some octane boost / injector cleaner by stp. I drove around town pretty hard for 45 minutes... I already can tell a little difference so maybe it is just the injectors.
My new question is: Is it bad to drive around like this when you arent totally sure what the problem is? Like if you had a fouled plug and drove on it, all that gas is accumulating in your cylinder unburned..obviously that cant be that good for your cylinder walls and rings, right? thanks again all! |
just a bump
|
opossum,
Probably not but it depends on what is wrong. Do you have raw fuel leaking into a cylinder? Are there loud and unusual mechanical noises? Are you experiencing very low MPG? Unusual oil consumption? I think injector clogging is more prevelent than a lot of people realize. Most drivers in America take it easy, don't do sustained high engine speed driving. Fuel quality varies a lot and some people don't see the value in running the right octane. The 300E will run poorly and stumble when warm and eventually also with cold starts when I have done the injector cleaning in a long while. This car has 207k miles and has never had the injectors replaced .... How is it running now? Haasman |
still pretty rough at idle and sluggish. How would I telll if raw fuel was building up in a cylinder? It isn't excessively noisy..maybe a ticking valve noise at most. Too soon to tell if I'm using excessive oil or gas. However, a friend of mine looked at it and is convinced that all the plugs are firing. I just wish I had access to a spare set of plug wires (I'd hate to spend 125 bucks if I didn't have to) I'm hoping the injector cleaner will clear things up over the weekend. If not I'll probably just order some plug wires anyway.
thanks again, opossum |
As it turns out, all the plug wires are indeed ok. There is not alot of marked improvement in terms of an injector clearing up. Is there a chance the the timing advance is stuck? How do I check for that? Is it a vacuum line?
thanks again everyone |
Have you tried checking the duty cycle? Do a search in the archives..
|
I had an occasional miss on my 190E, and it was a bad wire, easy to spot in the dark, actually it was 2 bad wires :)
xp |
Hmm,
what the heck is a duty cycle? Does it have something to do with the mixture? I've only heard of duty cycle in reference to welders..LOL! I did a search but there was nothing informative for the "fixing your car for dummies" type guy. thanks again. xp190, How did you tell that your wires were bad in the dark? |
Well,
I figured it out, there is no compression in #6. Valve job time? I just did the valve seals 2000 miles ago..should have done the whole thing, eh? thanks all |
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