Getting worse and worse!!!

[KILLA]

I have spent a good amount of time in the "why is my car running rough thread" and i have come to the conclusion that this deserves its own thread.

So far ive changed the CMP, CKP, checked fuel pressure and cleaned MAF. Since cleaning my MAF filaments ive had ALOT of bad starts, a couple stalls, and alot of white smoke. I am really getting concerned here, im scared that something terrible is going to happen.

cams are welded.

Im sitting at work right now. Im going to go check all of my fluids while awaiting responses so ill be back in a few. PLEASE HELP!

 

[1993MTXSHO]

white smoke or is it tintd blue, could have blown a ring... although i dought it.

 

[KILLA]

It looks completely white. A diesel mechanic at work told me it looked like coolant was burning, indicating a blown head gasket. so thats what im leaning toward. White smoke is also a result of it running rich i read, but my O2 sensors havent set a code. Actually, it hasn't tripped a LIGHT. but wouldnt a problem like this set a SES light b/c of all the smoke and all.

 

[Mr Anonymous]

I'm still unclear as to how your fuel pressure test was performed (see: http://www.shoforum.com/showpost.php?p=627807&postcount=24). If it was performed properly (FPR vac. line disconnected) then your fuel pressure is too low. If it wasn't done properly, you'll want to do it again to rule fuel pressure in/out as a potential source of your issue.

 

[Red Devil]

Make sure the pressure test was done right.
Pressure test the coolant system if you think you are burning coolant. (If it is blowing white smoke only until it warms up to op. temp, it's likely condensation in the systems.)
Can you datalog the vehicle?
Is it going into closed loop?

 

[nik97]

Have you checked for unwanted EGR flow yet? Pull and plug the vacuum line to the EGR valve for a while. White smoke is usually found with water in combustion. A rich burn will usually produce black smoke. I would perform a cylinder leakdown test. There's also a test that uses a special dye to check for combustion gasses present in the coolant...

 

[KILLA]

Mr. Anonymous- i have not redone the test as you idicated, but will shortly. It seemed to me...... nevermind. Your right, i need to be sure.

Red Devil- Its seems to be doing exactly that. Initial startup produces alot of smoke, but becomes less and less visible as i drive it. Its still there, but it is barely noticable after its driven a mile or two. I feel stupid that i havent had the WDS hooked up to it yet. When i do at lunch today, im going to ask about that data logging and closed loop thing. Ill also print a copy of this thread and the last as an aid.

Nik97- Excellent ideas. Your comment about the water in combustion made me think. I recently filled up my tank with some gas that a diesel tech pump out of a F-350. NOT diesel, but trace amounts of it im sure. The thing is, 3 other people used the same gas and havent had any problems. could my high compression SHO engine be responding different?

I Just want to take a second to thank EVERYONE on this forum. It is by far the best resource i could ask for. With this kind of help i know ill get i figured out soon enough.

With that said I am going to do everything in my power to get her up and running before or during the weekend. Im going to go talk the techs some more and see what they have to say.
----the tech ask me if there a coolant passage under the LIM gasket. Since i reused them during the weld it could be causing my problem.

 

[KILLA]

PROBLEM SOLVED!!!

It was the gas there must have been gallons of diesel in the gas he pumped out of that truck. I should have known better

 

[NebraskaSHO]

Quick question how did diesel get in your tank?

 

[Red Devil]

... I recently filled up my tank with some gas that a diesel tech pump out of a F-350. NOT diesel, but trace amounts of it im sure. The thing is, 3 other people used the same gas and havent had any problems. could my high compression SHO engine be responding different?
....

Seems it really was diesel in that diesel.

 

[nik97]

Hahaha! That's funny. Oh well, at least you're not chasing your tail anymore trying to find a problem.
At the dealership where I work, there are big fuel caddys that we use to store contaminated fuel from diesels as well. Most of the time someone will fill thier entire tank with unleaded, save for that one or two gallons of diesel still left in the tank, then bring thier Super Duty in barely running. =Money for me

 

[screamin3800]

Glad you figured it out,but if you're ever in question about a blown piston ring, or head gasket - do a compression test. I know thats easier said than done on these cars but if you have a cylinder or head that has way less compression than the other, you know you have a headgasket shot or if its isolated to one cylinder - you know that piston ring is gone.

 

[KILLA]

Once again, thanks everyone!:wave: Even though i didnt need to fix anything, i learned alot.

 

[SonicRiot]

Mmm. Deisel in the tank. Change your fuel filter and your oil... now. Your car may continue to run poorly for a few tankfulls, depending on how much deisel was put through the fuel system.

A can of BG in the tank of gasoline may help spped the 'cleansing.'