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I have heard many recommendations and even personally seen people use the seafoam spray with the little hose/hook and spray that into the throttle body while someone reved the car to 1500-2000 rpms until the can was empty. Basically removing the air intake from the TB and inserting the hose hook and then reattached the Air intake to the TB over the hose and having someone crank the car and revv it while another person sprays the contents of the bottle. After wards shutting off car and removing hose and i believe letting car sit for 15 minutes before driving it. Has anyone done this? Does it actually help? Is it harmful?
just for maintenance. I bought this car with around 140k miles and I recently changed oil & filter, serpentine belt/idler/tensioner, ac belt/idler/tensioner, intake manifold gaskets, oil sending unit, and battery. All things that were going to need to be changed in next year or less anyways. I noticed in lower gears it doesn't have the same quick get up as my 7 series or c4, but in upper gears it is marvelous and vastly superior. I also looked and found out that it has the 3.15 gear axle performance ratio and not the 2.73 stock one so I figured maybe it could benefit from some cleaning in the upper engine and air intake. I am going to clean the MAF and TB anyways and figured while I was in there if there is an added benefit as I read so much about, why not. Going to be taking it few hundred mile trip to beach this weekend and figured that and some techron in the fuel would be good way to clean it out over a drive.
I suggest carefully clean the MAF and TB as you are planning to anyway.
I've seen crud built up on injectors from age / lousy gas these days. Every year I throw a full can of seafoam in the last 1/4 of a tank of gas, then run it down as low as I dare. Do this on all 3 cars. Noticeable improvement in start/warm up smoothness, small throttle input smoothness.
I suggest carefully clean the MAF and TB as you are planning to anyway.
I've seen crud built up on injectors from age / lousy gas these days. Every year I throw a full can of seafoam in the last 1/4 of a tank of gas, then run it down as low as I dare. Do this on all 3 cars. Noticeable improvement in start/warm up smoothness, small throttle input smoothness.
good luck!
you put seafoam in gas? I thought of trying that as well instead of techron this time as well. The seafoam for the TB is specifically designed just for that. I just want to make it drive as best as possible as well as be as clean as possible. Want to get another 100k miles out of it at minimum
Did you pull the air bridge and visually inspect the throttle body? A simple paper towel is pretty effective.
Yes I did that. Didn't look terribly dirty from what I could tell. Already sprayed some MAF cleaner and a little TB cleaner u had left in there and cleaned out a little with a rag. It was for sure black on the rag but nothing excessively so. Basically just wondering if it is beneficial or not and if it can cause any damage running the seafoam this way. There are videos on YouTube and many articles showing it done etc as well. Just didn't know if anything specific to the c5 that I needed to know
I'm either going to run the seafoam through through vaccum or just add bgk44 to the tank to put a good cleaning on the fuel injection system. Basically I am looking to increase the efficiency and performance of the car, esp in lower gears. My assumption was that since it has performance gear axle ratio it was more likely the intake system and that cleaning this would offer most benefit. Plus I use techron usually twice between oil changed already. But I could be wrong and maybe bgk44 and the fuel system is where I will get the desired results.
I have heard many recommendations and even personally seen people use the seafoam spray with the little hose/hook and spray that into the throttle body while someone reved the car to 1500-2000 rpms until the can was empty. Basically removing the air intake from the TB and inserting the hose hook and then reattached the Air intake to the TB over the hose and having someone crank the car and revv it while another person sprays the contents of the bottle. After wards shutting off car and removing hose and i believe letting car sit for 15 minutes before driving it. Has anyone done this? Does it actually help? Is it harmful?
I did it a year ago, that was before I knew my valve seats had been wasted.
Did it do anything? Idk maybe if the seats were fine then I'm sure I would of felt something.
just for maintenance. I bought this car with around 140k miles and I recently changed oil & filter, serpentine belt/idler/tensioner, ac belt/idler/tensioner, intake manifold gaskets, oil sending unit, and battery. All things that were going to need to be changed in next year or less anyways. I noticed in lower gears it doesn't have the same quick get up as my 7 series or c4, but in upper gears it is marvelous and vastly superior. I also looked and found out that it has the 3.15 gear axle performance ratio and not the 2.73 stock one so I figured maybe it could benefit from some cleaning in the upper engine and air intake. I am going to clean the MAF and TB anyways and figured while I was in there if there is an added benefit as I read so much about, why not. Going to be taking it few hundred mile trip to beach this weekend and figured that and some techron in the fuel would be good way to clean it out over a drive.
I'd recommend using GM Top Engine Cleaner to clean the top of the pistons and valves of carbon deposits...you can get misfires if those valves are all carboned up...the carbon acts like a sponge for the injected fuel and you’ll get lean misfires...this is even a TSB !!...I did my ‘01 last year with 2 cans !!
I'd recommend using GM Top Engine Cleaner to clean the top of the pistons and valves of carbon deposits...you can get misfires if those valves are all carboned up...the carbon acts like a sponge for the injected fuel and you’ll get lean misfires...this is even a TSB !!...I did my ‘01 last year with 2 cans !!
hey c5diag,
wjwre do you use this? In the gas tank with fill ups? Is this similar to Techron?
Last edited by Tbone1105; Jun 18, 2020 at 04:12 PM.
so you are recommending I use this over seafoam? And spray it directly into pcv valve while engine is warm and at 1500-2000 rpms? I don't really have any of the issues in the link. No misfires or hard idle or start issues. I just want to do a mini tune up type effect and also clean up this high mileage engine.
so you are recommending I use this over seafoam? And spray it directly into pcv valve while engine is warm and at 1500-2000 rpms? I don't really have any of the issues in the link. No misfires or hard idle or start issues. I just want to do a mini tune up type effect and also clean up this high mileage engine.
hes recommending you don’t do anything. You’re overthinking this. Just go drive the car.
so you are recommending I use this over seafoam? And spray it directly into pcv valve while engine is warm and at 1500-2000 rpms? I don't really have any of the issues in the link. No misfires or hard idle or start issues. I just want to do a mini tune up type effect and also clean up this high mileage engine.
Seafoam isn’t going to “tune up” your engine...with a high mileage engine short of a complete overhaul there is not much you can do !!...your PCM does however change some of its parameter as the engine mileage increases and the engine wears !!
Seafoam isn’t going to “tune up” your engine...with a high mileage engine short of a complete overhaul there is not much you can do !!...your PCM does however change some of its parameter as the engine mileage increases and the engine wears !!
tune up was not meant in the literal sense. A little pick me up on the acceleration side though is not at all out the question as many people on here make it seem to be such a laughably impossible notion that it is not. My mechanic has done this before with my 95 z28 at around the 97k mark and it made a noticeable difference in the response. Same as with the Silverado I used to have at closer to 200k miles. At the time I drove them as my DD and any difference was noticeable. Just wondering if the same would be possible with my c5 as I tend to both adore and enjoy this car more than any before and do not want to do anything that couldn potentially have a negative impact. Plus my mechanic is no longer working due to health issues and is a little worse for wear so I do not want to bother him.
I really don’t know how Seafoam can cause the car to have more “pick up” ????????...what does it do ????...other than maybe have a tuner fiddle with PCM I don’t see a benefit...if you think it will help go for it !!...I don’t use any of those “copper bracelets” so that’s how I stand on this !!
tune up was not meant in the literal sense. A little pick me up on the acceleration side though is not at all out the question as many people on here make it seem to be such a laughably impossible notion that it is not. My mechanic has done this before with my 95 z28 at around the 97k mark and it made a noticeable difference in the response. Same as with the Silverado I used to have at closer to 200k miles. At the time I drove them as my DD and any difference was noticeable. Just wondering if the same would be possible with my c5 as I tend to both adore and enjoy this car more than any before and do not want to do anything that couldn potentially have a negative impact. Plus my mechanic is no longer working due to health issues and is a little worse for wear so I do not want to bother him.
By all means, use sea foam. Use two cans. Use 3 cans. Report back on your pick me up on acceleration. Looks like your mechanic was taking you for a ride.
Seafoam into throttle body?
