Welcome to the Corvette Forums at the Corvette Action Center!

dumb engine cleaning question

Joined
Oct 30, 2001
Messages
2,273
Location
Glen Burnie, MD, USA
Corvette
1986 Bright Red Coupe
Today one of my mechanics told me to buy a couple bottles of GM "Top Engine Cleaner" to clean the deposits out of the engine. However, his instructions were to "find a good vacuum line, pour the stuff in, and let it soak."

Something seems a bit odd about that... can I just take off the MAF and bellows and pour it straight into the throttle body?

The directions on the can are for carbuerated models: take off the air cleaner, start the engine, pour most of the bottle in until the engine starts to choke, then quickly dump the rest in and let it stall. Then let it soak, put the air cleaner back on, and rev the heck out of it.

Any suggestions?
[RICHR]
 

vigman

Motor head!!!!
Joined
Feb 13, 2001
Messages
3,471
Location
Valencia, CA,USA
Corvette
88 Convert ( SOLD ) /1973 coupe 4 speed/1964 Vert!
Another way to go

Small hose & funnel
Open the throttle plates
(engine off & hot)
Shove hose 1/2 way down plenum

Pour stuff into funnel connected to hose.

Ta Da

Mike
 
Joined
Oct 30, 2001
Messages
2,273
Location
Glen Burnie, MD, USA
Corvette
1986 Bright Red Coupe
Thanks - that makes sense.

Weekend project... along with replacing an oddly noisy PCV valve (I realize that a rattle is normal when you shake one, but this sounds like a paint can shaking in my engine!)
[RICHR]
 

bradfordsvettes

Well-known member
Joined
Mar 28, 2001
Messages
549
Location
Boston, MA area
Corvette
jewel blue 61.cranberry 69 t-top.black rose 92
pcv

get a gm valve the after market one are notorious for rattling not calibrated correctly
 
Joined
Oct 30, 2001
Messages
2,273
Location
Glen Burnie, MD, USA
Corvette
1986 Bright Red Coupe
get a gm valve the after market one are notorious for rattling not calibrated correctly

And that's exactly what I did, at the same time I picked up the engine cleaner. Mechanic said the same thing you did. Good advice...
[RICHR]
 
Joined
Oct 30, 2001
Messages
2,273
Location
Glen Burnie, MD, USA
Corvette
1986 Bright Red Coupe
Welp, did the cleaning today. As it was snowing heavily, I did the whole thing in the garage - which now smells of engine cleaner, even though the door was open. Was never able to actually stall out the engine with the stuff, but poured two bottles in through the throttle plate while the car was running, then shut it off and let it sit for a while before restarting it and revving the heck out of it.

Got cleaner spit out the tailpipes. Is this normal???

Also took off the distributor cap and cleaned the contacts, plus the tip of the rotor, and removed the screens from the MAF.

Car at least idles better, but it'll be a good couple of days before I can drive it again and see if any real difference was made. Might also change the plugs out while I'm playing.

Thanks for the help, folks...

[RICHR]
 

vigman

Motor head!!!!
Joined
Feb 13, 2001
Messages
3,471
Location
Valencia, CA,USA
Corvette
88 Convert ( SOLD ) /1973 coupe 4 speed/1964 Vert!
Did ya

clean the IAC motor?

Will help the idle situation as well.

Mike
 
Joined
Oct 30, 2001
Messages
2,273
Location
Glen Burnie, MD, USA
Corvette
1986 Bright Red Coupe
Re: Did ya

vigman said:
clean the IAC motor?



No... didn't know it existed :( I'll check my Haynes.

And here I thought I'd be getting a LESS-complicated motor than my Subaru one. Guess there's something to be said for 100% computer control.

[RICHR]
 

Corvette Forums

Not a member of the Corvette Action Center?  Join now!  It's free!

Help support the Corvette Action Center!

Supporting Vendors

Dealers:

MacMulkin Chevrolet - The Second Largest Corvette Dealer in the Country!

Parts/Accessories:

Vetteskins

Advertise with the Corvette Action Center!

Double Your Chances!

Partners

Top Bottom