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Old 11-06-2011, 07:58 AM   #1
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Additive to clean injectors?

I have a Chevy Vortec 454 in a '98 National Dolphin and want to add injector cleaner to the gas. It holds 75 gal and I am wondering how much I should add to the tank to do any good. The tank is near full now and I have 4 bottles that I am planning to use.

The gas mileage is not as good as I think it could be. Will this help at all with a full tank?

John
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Old 11-06-2011, 08:03 AM   #2
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Originally Posted by zzjea View Post
I have a Chevy Vortec 454 in a '98 National Dolphin and want to add injector cleaner to the gas. It holds 75 gal and I am wondering how much I should add to the tank to do any good. The tank is near full now and I have 4 bottles that I am planning to use.

The gas mileage is not as good as I think it could be. Will this help at all with a full tank?

John
One 16oz can of Seafoam per 25gals,(3 total) will do the job in your MH. We use this stuff about twice a year in our vehicles. Works very good with diesels to. Can usually be bought at WM, Napa, etc. Sea Foam | How to Use Sea Foam Motor Treatment
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Old 11-06-2011, 08:44 AM   #3
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remove the doghouse cover and you can get to the TBI injectors really easy. You cant drive them clean. Best to have them flowed and cleaned. Runs about $21 per injector plus shipping... you have 2 of them.
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Old 11-06-2011, 10:56 AM   #4
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remove the doghouse cover and you can get to the TBI injectors really easy. You cant drive them clean. Best to have them flowed and cleaned. Runs about $21 per injector plus shipping... you have 2 of them.
What do you mean flowed and cleaned? Please explain and what do the injectors look like? Where do I get the stuff to do the cleaning?

Thanks.
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Old 11-06-2011, 03:43 PM   #5
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The injectors have to be removed and sent for cleaning, or replaced with new ones.

Seafoam is a preventive maintenance step, but if you really have that dirty of injectors, it's best to have them cleaned or just replaced.
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Old 11-06-2011, 04:06 PM   #6
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What do you mean flowed and cleaned? Please explain and what do the injectors look like? Where do I get the stuff to do the cleaning?

Thanks.


can send them here
www.injector.com

http://www.injector.com/injector_service.html

A mobile service tech can have them removed in under 30 mins if youre not handy.
Those injectors are expensive to replace hence the suggestion to have them flowed and cleaned (a printed bench mark of the injectors performance)
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Old 11-06-2011, 10:03 PM   #7
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Chevron Techron
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Old 11-07-2011, 10:48 AM   #8
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2? Aren't there one per cylinder? Please explain. Thanks.
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Old 11-08-2011, 06:07 PM   #9
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2? Aren't there one per cylinder? Please explain. Thanks.
I talked with the local GM parts dealer today and gave him my VIN. He said it is a '98 chevy 454 (7400) L29 MFI with 8 fuel injectors. Now I know. Will try using Techron to see if it does the job. Will probably use 3-4 bottles since my 75 gal tank is over 3/4 full at this time.
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Old 11-08-2011, 08:40 PM   #10
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2? Aren't there one per cylinder? Please explain. Thanks.
He was under the impression you had a TBI emgine in which there are only 2 injectors. No matter.. You can have your clean professionally also..

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I talked with the local GM parts dealer today and gave him my VIN. He said it is a '98 chevy 454 (7400) L29 MFI with 8 fuel injectors. Now I know. Will try using Techron to see if it does the job. Will probably use 3-4 bottles since my 75 gal tank is over 3/4 full at this time.
It might take more than one tank, but Techron is highly regarded. It is the only one approved by Audi/Porch/VW for example.. I try to stock up when Advanced Auto has them at 2 for 1.
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Old 11-08-2011, 09:26 PM   #11
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Chevron Techron
I had our chemist run some Techron through the gas chromatograph and it came up 98% naptha and 2% inert ingredients.

Still good stuf for injectors.

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Old 11-08-2011, 09:49 PM   #12
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One 16oz can of Seafoam per 25gals,(3 total) will do the job in your MH. We use this stuff about twice a year in our vehicles. Works very good with diesels to. Can usually be bought at WM, Napa, etc. Sea Foam | How to Use Sea Foam Motor Treatment
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Chevron Techron

I have used both in my 1995 Ford F-250 460 cid . Chevron Techron works good, also Seafoam works good. I haven't put any in my RV but in my truck I have used both and Seafoam seemed to work better In my opinion.


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Old 11-08-2011, 09:52 PM   #13
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One 16oz can of Seafoam per 25gals,(3 total) will do the job in your MH. We use this stuff about twice a year in our vehicles. Works very good with diesels to. Can usually be bought at WM, Napa, etc. Sea Foam | How to Use Sea Foam Motor Treatment
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Old 11-09-2011, 06:01 AM   #14
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2? Aren't there one per cylinder? Please explain. Thanks.
sorry I thought you had a TBI intake. You can do the same service on direct port injectors as well... the labor will be abit more expensive to remove them.

The pour in treatments may or maynot work. I suggested the injector cleaning service because you get a benchmark of the flow rate before and after service.
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