3-Series (E21, E30)Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.
hi everybodyyy has anyone did this "hot soak" i saw it on this little forum the other day
I used a 20 ounce bottle of Chevron Techron for the procedure and man it was interesting.
I got the whole bottle in and then just as it sucked the last bit out the car stalled so the procedure was perfect. I let it sit for about 3 hours and then it actually started up on the first crank. It sounded like crap though and was extremely rough at first. TONS of white smelly smoke was poring out of the exhaust for about 15 minutes at idle and then it slowed down so I revved her up to about 2500 rpms and let the smoke keep poring out till it became a light amount. Then I put her in gear and pulled out onto the highway....
Man, the car was quick and extremely smooth as well as quiet. I would recommend this to anyone that has not yet done it and has over 100,000 miles on their car (i have 155,000) The car feels sooooo Much different that it's amazing. I think I now know what the car felt like to drive when it was damn near close to new.
Just for good measure I had my gas tank below a quarter and added 4 bottles of Lucas Fuel injector cleaner and upper cylinder lubricant into the gas before I took off driving. Then this morning on the way to work I filled her up with premium and I gotta say for the $10 I spent I could have not gotten a better performance gain.
Basically, you go to the store and buy a 20oz. bottle of Chevron Techron fuel system cleaner. Then you go drive you car until the engine is plenty hot.
Keep the car running and disconnect the hose that goes from the fuel pressure regulator to the exhaust manifold. (this hose is easy to locate. It is the only vaccuum line that is connected on the top of the intake manifold and runs a short distance to the FPR which is a small black piece located dead smack in the middle of the engine bay twords the front of the engine. The other side of the FPR has a fuel line attached to it via a clamp.)
This hose needs to be disconnected from the FPR and left connected to the intake manifold. When you disconnect it if you stick your finger on the tip of the hose you will feel your finger get slightly suctioned onto the hose.... This way you know you have done it right.
Now make sure you have an empty bottle of gatorade or something that is clear so you can see through it and is a 20oz. bottle. Pour the bottle of techron into that clear bottle and then stick the end of the hose into the bottle and let it start sucking out the cleaner into the manifold. The car will attempt to stall so it is best to have someone sitting in the drivers seat presing the gas to hold the rpms around 2-3k as to ensure it not stalling. Once the bottle is down to about 1/4 left tell that person to take their foot off the gas and you just keep the hose at the bottom of the bottle. Let all of the cleaner get sucked out and then the car should stall. If it doesnt stall make it stall immediately.
Let the car sit for at least one hour and then start it up again. It may take a few cranks and it will idle like **** at first, but you will see tons of white smoke coming out the tailpipe. Once that smoke dies down a bit take the car for about a 20 minute drive in all different gears and varying rpms to ensure you have removed all the smoke.
Member of got its raining(in Members Lounge) to 100, 237, 250, & 300 pages club...
Member of 3 Pedel club...
Member of ran away from cop using DRIFTING not speed(ok a little speed)...
Not that I wouldn't love to dump stuff into my intake manifold while the car is running and rev it hard so it won't stall, but I'd definitely want to know exactly what is being cleaned out of there, where all that stuff is going, and how it's getting there before even thinking of attempting this.
Cars stall to tell you that they're not getting what they need to function properly.
Prolonging that sort of thing doesn't sound attractive.
Here's the basic problem: The e30 has only 2 injector pulse cicuits. You have 6 cylinders. So the injector pulses cannot be timed to fire while every valve is opening. Therefore a fair amount of fuel gets sprays onto the backside of a hot valve and deposits build up. They also build up in combustion chambers over time. The hot soak is the best way to periodically address this problem.
ive always been pretty skeptical about this bottled performance stuff, especially due to the fact that it is dirt cheap. however im as open minded as anyone, so make sure u let us know how it went. if i was to do this the smoke thing is my biggest cause for caution at the moment. the process is obviously burning off something, but what exactly?
i havent actually come across these products yet so i havent had the chance to read the bottle.... and i know this is pretty unlikely, but is there any mention of a gurantee or financial coverage if this stuff was to completely shag your engine to pieces? of course this is assuming the correct procedure was undertaken.
One thing you should realize is that what we're discussing isn't a bottled-performace product like, say, Octane booster is. This is a cleaning agent, which is designed to dissolve and clear out the crap you've accumulated in your few hundred thousand miles. I looked at one of the bottles the other night when I was getting some power steering fluid, and while I didn't see any kind of guarantee that matches what you're asking about, keep in mind that the chemicals in question are (though perhaps not in one's intake manifold) intended to run through your internals and they're not doing anything they weren't meant to.
The most damage I can see coming out of this situation is either running your internals dry, since this stuff probably washed a lot of oil from your seals and whatnot. I don't think it can do much of anything directly.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.