Failing emissions! 1995 S500 Coupe - Page 2 - PeachParts Mercedes-Benz Forum

Trojadc · #16 06-11-2007, 08:40 AM

Point well taken.....yadayadayada!
Regards - and thank you

Trojadc · #17 06-13-2007, 09:01 AM

Sigh of relief!.. Just had the benz retested and it passed with flying colors. The NOx which when last tested blew a 2.69 with a legal limit of 2.50, now passed with a 1.33!!! All I did was pour a container of GTP in the tank, ran it hard for the entire tank full, then refilled and had her tested. Thanks for all your imput...yadayadayada!!

Arthur Dalton · #18 06-13-2007, 12:25 PM

Very good..
These engine actually prefer to be worked..it is a good practise to use a lower gear range for a few miles once in a while to keep these parts clean and the engine breathing well. Specally if you do much around town/ low rpm use.
Some call it the "Italian Tune-up"

emerydc8 · #19 06-13-2007, 10:37 PM

What is GTP and where can you buy it?

deanyel · #20 06-13-2007, 10:54 PM

Guaranteed to Pass, just about any auto parts store.

emerydc8 · #21 06-14-2007, 03:49 AM

Thanks. Has anyone else had any experience using this product? Sounds like it had some significant beneficial effects for trojadc.

Trojadc · #22 06-14-2007, 09:06 AM

It was my first time ever trying it. A friend of mine recommended it. He had a daughter about ten years ago with a car that was older, but with low miles. He tried it(after it had failed for emissions in Massachusetts) and it worked as well. So I guess it has been around for a while. I bought it at an Autozone store here in the Northeast. I asked the 'older' gent that worked there if it really worked. While he said he does know that much about it, he did say it is a big seller, and no one ever comes back to complain. For what it is worth.
Regards
Andy

Arthur Dalton · #23 06-14-2007, 09:18 AM

GTP is a fuel system cleaner additive. Will clear out dirty injectors and lines , but cat and 02 sensor clearing is best done with a good rpm run UNDER LOAD to heat the exhaust to max temp.. A fuel additive does not/will not do that..
All the large, premium quality petro companies formulas use enough detergent additives for modern day FI systems.. Chevron's Techron is a good one..just try to always gas up at high volume stations...
If one has a dirty fuel system , a good cleaning will certainly help fouling injectors, but in your case, I would bet the run did more to pass your test than the fuel additive did..
Regardless ..at least you got it done w/o having to deal with a big $$$ solution.

BENZ-LGB · #24 06-14-2007, 10:43 AM

Quote:

Originally Posted by emerydc8

Thanks. Has anyone else had any experience using this product? Sounds like it had some significant beneficial effects for trojadc.

It worked in a 1991 420SEL that I used to own. Last time I tested it, just before I sold it, the car had just a tad over 250k miles and it did not pass.

I then poured a can of GTP, drove the car hard and made sure that the engine was nice and hot when I took it in for the test.

It then passed with flying colors.

BTW, my 1989 300TE, with 210k miles on the clock was recently smogged.

It passed with flying colors (no tricks, no GTP, just a well-tuned engine!)

Arthur Dalton · #25 06-14-2007, 10:51 AM

<>

So , do you attribute the pass to the Hard run and hot engine/exhaust or to the gas additive cleaner???

BENZ-LGB · #26 06-14-2007, 03:52 PM

Quote:

Originally Posted by Arthur Dalton

<>

So , do you attribute the pass to the Hard run and hot engine/exhaust or to the gas additive cleaner???

Hard to say, because I had been getting some pinging in that engine prior to using GTP.

I think that driving it hard, to get the cat fully warmed, prior to the test probably was a major contributor.

To be totally scientifc about it I should have...oh heck I am just glad it passed. If burning a votive candle prior to the test made the car pass, then more power to candles.

Arthur Dalton · #27 06-14-2007, 06:13 PM

<>

I hear ya...just another one of those things we all sweat, no matter how new /nice your car is....it's always a relieved feeling when the guy says it "PASSED"...

BENZ-LGB · #28 06-14-2007, 06:32 PM

Quote:

Originally Posted by Arthur Dalton

<>

I hear ya...just another one of those things we all sweat, no matter how new /nice your car is....it's always a relieved feeling when the guy says it "PASSED"...

Yep!

Trojadc · #29 06-15-2007, 08:44 AM

Or in my case, in Massachusetts I stood right by the computer and printer, during the entire test... and waited to hear the sound of the printer and the ink it was putting down.. If you don't hear a lot of ink being applied to the sticker, then you know you are sunk.. in the middle of the sticker will be a large square empty spot where the apply the separate "R" for reject. If it passes, the printer will be busy inking down the number 6 corresponding to the month it was tested and passed. I got to hear that happy printer inking up my sticker for the first time in three attempts!.. Yes they were kind enough to allow we to be right in the "delivery room" and not leave me to wonder in the waiting room on the outcome!