Im SORRY 91 Lumina

[Sarahliz1981]

Sorry brake booster is one of the methods used. Yes, the hose. No, I didnt do it through the brake booster yet as I do in all my vehicles. I did it in the crankcase....which I had never done. Hence why I feel like crap about it. I have used seafoam for years and loved it. Brought my cherokee back after some issues also.

I DID change the oil twice after AND kept the fuel full in an attempt to dilute it. I am still thinking EGR Valve and as you guys said, O2 sensor or CC.

I am going to research how to clean the valve tomorrow as I have a friend that is doing his truck tomorrow also. Then I will go to the O2 sensor. I was just thinking maybe, just maybe the seafoam through the brake booster line would push that carbon and build up out of there. Now you guys have scared me.

[Bearwulf]

Fuel pressure Check: key on, engine off, min. pres. 40.5psi, max. pres.47.5psi; engine running, maximum pres. drop 10psi, with minimum running pres. of 37psi, as stated earlier by MAXWEDGE.

[Blue Bowtie]

Originally Posted by Sarahliz1981

...I feel like crap because he just got the car and Im the one who had him do the seafoam.
Any one have experience with this?
Ive used seafoam on my jeep, my honda, my brothers 3 cars, friends vehicles.... never had this problem.

There will be nothing productive resulting from feeling guilty. What has been done is done. Move forward, and repair the problem.

Any experience with this? Definitely.

[RANT]

I saw a running Pontiac 400 ruined with SeaFoam in the crankcase. Fortunately, the owner understood that the car was worth saving the engine (1968 Firebird) and the new rings and pistons "undid" the SeaFoam treatment. He now has a 409 RA (the damage from the broken rings was cleaned up at 0.040" overbore). I'll never understand why people would put alcohol and water in a crankcase.

No matter, to avoid feeling guilty about this ever again, learn from mistakes and never do it again. Surely, many people do this. Many people also free-rev or load a cold engine, and they never think twice about the potential damage they are causing. Many of those engine survive (for a while) so they feel no remorse in abusing an engine. People used to throw handfuls of walnut shells through a wide open carb on a Ford flathead to break up the carbon, instead of removing the heads and doing a proper job. Since many of them survived the abuse, they thought there was nothing wrong with the idea. Thousands of people use Prolong in their engines untill the class-action suit and FTC settlement forced it off the market. Some of those abused engines might even still be running. None of that means those were the "right" things to do. People just got away with it for a while, not unlike politicians not paying income taxes. Eventually, it will bite back.

[/RANT]

As for the problem at hand, diagnosis instead of guessing will identify the problem(s). A cylinder leakage test should reveal if there has been any mechanical damage. A cranking compression test is a second best method if a leakage tester is not available. If there is mechanical damage, no amount of spark plugs, coils, wires, ICMs, ECMs, or fuel pressure will matter.

Testing spark is another good step. Make sure the spark energy is adequate. If you are using anything but Delco, NGK, or Champion single side electrode spark plugs, remove them and recycle them. Install real spark plugs.

If you are using anything but silicone resistance wires, remove them and throw them away. Wasted spark systems do not tolerate "designer" spark plug wires for long.

[Sarahliz1981]

Thanks guys! Im starting on the list now.