Cured horrible knock
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Post Fiend
Joined: Jan 2000
Posts: 5,860
Likes: 4
From: Metro Detroit (Redford)
Cured horrible knock
1992 Aerostar 3.0 with auto tranny and 108,000 miles. Pinging under acceleration was so bad I had to run 93 octane. Last Saturday when the engine was very hot I pulled the intake duct, revved it, and poured water into the intake. No more knock. I promptly filled up with 18 gallons of 87 octaine and tried my best to get it to knock. No knock. Now, 50 miles later, still no knock. I think it is cured.
First I tried a squirter bottle and ran 14 oz water in that way but it was taking too long, so I unscrewed the top and poured the last 8 oz through in the course of 1 or 2 minutes. No noticible smoke, but there was a burnt firecracker smell around the van (carbon?).
First I tried a squirter bottle and ran 14 oz water in that way but it was taking too long, so I unscrewed the top and poured the last 8 oz through in the course of 1 or 2 minutes. No noticible smoke, but there was a burnt firecracker smell around the van (carbon?).
Posting Guru
Joined: Jul 2004
Posts: 2,416
Likes: 1
From: Mitchell, SD
The dumping of water "down the carb" is a very old practice of de-carboning the combustion chamber walls and intake valves.
The 3.0 is known for carbon buildup over time. But instead of using water (which can lead to rust, don't want that happening in the engine.) I take a can of Berrymans B-14 and us an intake vaccuum hose suck it in while someone pushes down on the accelerator to about half throttle. LOTS of smoke and coughing, but No rust and will remove every spec of carbon.
The 3.0 is known for carbon buildup over time. But instead of using water (which can lead to rust, don't want that happening in the engine.) I take a can of Berrymans B-14 and us an intake vaccuum hose suck it in while someone pushes down on the accelerator to about half throttle. LOTS of smoke and coughing, but No rust and will remove every spec of carbon.
Post Fiend
Joined: Apr 2005
Posts: 5,720
Likes: 5
From: Washington state
All that carbon and water had to go somewhere, water does not burn at least not yet until we turn it into hydrogen.
I would definitely run a can of motor flush in the old oil, bring up to temp, drain, change filter and give that old girl some quality 5-30, maybe one of the new high mileage oils that have extra detergent additives to clean out the carbon that has built up in the engine.
My '96 Aero awd just loves her Mobil 1 synthetic 5-30, no more lifter noise on startup and she purrs at 80 on the freeway.
I would definitely run a can of motor flush in the old oil, bring up to temp, drain, change filter and give that old girl some quality 5-30, maybe one of the new high mileage oils that have extra detergent additives to clean out the carbon that has built up in the engine.
My '96 Aero awd just loves her Mobil 1 synthetic 5-30, no more lifter noise on startup and she purrs at 80 on the freeway.
Thread Starter
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Post Fiend
Joined: Jan 2000
Posts: 5,860
Likes: 4
From: Metro Detroit (Redford)
I don't know. The oil seems fine at this point. Why would the water not blow out through the exhaust pipe?
The vacuum tube in a can of Berrymans or Seafoam sounds good too, especially if you do it while cruising 70 mph.
The vacuum tube in a can of Berrymans or Seafoam sounds good too, especially if you do it while cruising 70 mph.
