Is Techron safe to use in a 90 or will it damage the fuel injectors?

 

thechron is safe and approved/recommended by most manufactures.
works very well also.
Bob

 

Except according to the manual, you are not supposed to use fuel injector cleaner with the stock fuel injectors I have. So is it safe or not to use or will it damage the injectors?

 

yes, pretty much any injector cleaner you get preadded into the fuel, is perfectly safe as it is very diluted.

 

I used it in my '91 for 10+ years before I built the new motor...

Not a problem...used it every 3 tanks of gas. Might have been overkill, but we did the same thing with our Audi Turbo and it had a recall for valve buildup. The mechanic scoped the cylinders and said it looked like a brand new engine.

The $hit works....great!

 

Works great, and will not kill your o-2 sensor.

 

I use it every few months and no problems.

 

 

Did some research on this just recently. Other than the GM over-the counter product, Techron is the only reccomended fuel additive for modern "self-cleaning' fuel injectors on all GM vehicles. I use it because it works....period.

 

Absolutely, it is the best. It is not a solvent or alcohol like other cleaners; it is more like a detergent. Therefore, there are no solvents to damage the injectors.

 

There are a lot of "yes" answers above and Techtron is very good stuff ......except in Corvettes 89 thru 91. This is due to the type of injectors used in these model years. I know some people will say.....BS! However, read this service bulletin from GM on this very topic:



Put this stuff in the gas tank of a 90 Vette and send me a note in a few months as I can recommend replacement injectors for you

 

Well, since my injectors went 10+ YEARS...I'd be waiting about 120 months for your injector recommendation

Techron...from Chevron's web site.

"Polybutene Amine (PBA) and Polyether Amine (PEA) are two chemical technologies originally developed and patented by Chevron to help clean harmful deposits from carburetors, injectors, valves, and ports. Although commonly found in most consumer fuel system treatments, PBA still leaves behind combustion chamber deposits, preventing an engine from being restored to its original performance.

Not only does Techron Concentrate Plus have enough PEA to help remove deposits from your fuel system in one tankful, but it also can clean and protect your fuel system sensors from sulfuric buildup - the root cause of faulty fuel gauge readings."

It's up to the individual...but I can't say that it was harmful to mine. I had 65k miles on the original injectors...and when I pulled the motor I have 1 that is showing minimal signs of the coil shorting...about 45 ohms different than the other 7.

 

I had seen the service bullitin before, that is why I asked the question. I saw a post that said that Techron wouldn't hurt the injectors on a 91. Well a 91 has the same injectors as mine. My car has 90,000 miles on it with the original injectors.

 

myscx: Let me tell you what I know of the 89 thru 91 Multec injector issue. I purchased my 89 Corvette in 2001 with just under 39000 miles on it. From day one, it ran like crap! It had a miss at idle and did not have the power to spin the tires like a Corvette should do. I threw a lot of parts at it....and it needed most of them! The idle improved, but it still had a miss. Then, I remembered Techtron injector cleaner as i had used it in other cars with very good results. The idle improved for a week or so.....and then it got worse...much worse! After a search on the forum, I sent a note to Rich Jensen at Cruzin Performance for help. Here is his response:

-----Original Message-----
From: Rich Jensen [mailto:rich@cruzinperformance.com]
Sent: Wednesday, October 08, 2003 10:24 PM
To: arlamb
Subject: Need Injector Help!!!


Hi Bob,

The problem you currently have is that from 1989 through 1991 on the L98 engines GM installed Multec injectors. These injectors have one of the highest failure rates of any injector ever installed. It's not a matter of "if" they are going to fail, it's simply a matter of "when" they will fail. That is why some of your injectors look differently than the others. Some of them have obviously already failed and were replaced. Because of their design they cannot be repaired so the only solution is to replace them.

You can try to find some of the same injectors to use as replacements however they will likely eventually fail also so a better alternative is to replace them with an aftermarket set of replacement injectors or find some of the earlier Rochester injectors that were used from 1986 though 1988 on the L98's. These were a Bosch design injector and they don't have the problems that the Multecs do.

I don't sell any injectors so I can't help with supplying replacements but if you do find a set of the earlier design injectors I can service those and they have a very good track record of long life and serviceability. The part numbers you would be looking for are: 1986 = 5235211, 1987 and 1988 = 5235302. These are the part numbers that are on the injectors themselves. They are not the part numbers that would be listed in a GM parts catalog.

Sorry to be the bearer of bad news but that's just the way the Multec injectors are.

Hope this helps. Let me know if you need more info or have additional questions.

Rich Jensen

Some more reading revealed that the 89 -91 Multec injectors are a different design from previous GM injectors in that the gasoline actually flows over the coils of wire (solenoid) in the injector in an attempt to make them run cooler. Back in the late 80s and early 90s the fuels were different from what they are today and the insulating material on the solenoid wire was not formulated to withstand todays gasoline with it's new additives. Over time, the wire insulating enamel breaks off and shorts to the adjacent wire coils. This reduces the efficiency of the injector and less fuel in injected into that cylinder. This process continues until the car will almost not run.

As with all manufacturing process, there is variation. This applies to the wire mills who make the injector coil wire. This is why some injectors seem to last longer than others You may be lucky and they never fail. This was not the case with my 89 Vette.

I hope this is helpful to you and sorry to be so long winded.

Bob

 

Thanks for the info, I appreciate it! I guess I have been just lucky my fuel injectors have held up. Any other recommendations on replacement injectors?

 

So its OK to use Techron in an 88 vette?

 

Based upon what little I know, I would say YES! I have a set of 88 Lucas injectors in my 89 and I use Chevron Techtron FI cleaner in it.

 

If you run Chevron or Texaco gas, you won't need to worry about it. Over a short period of time, they will clean themselves.

 

There are a lot of "yes" answers above and Techtron is very good stuff ......except in Corvettes 89 thru 91. This is due to the type of injectors used in these model years. I know some people will say.....BS! However, read this service bulletin from GM on this very topic:

SAM LAM knows this subject........I had used techron previously not excessively but nevertheless used it and was not aware of the warning. My '91 idled rough, surged while cruising and was rich too. SAM LAM advised a resistence test for the injectors and they were way out of spec. Replaced the injectors and WOW what a difference, like a new ride, crisp shifts, and lots more pull. They must have been bad for a long time....you got to ask yourself why would the GENERAL issue the TECH Bulletin for these particular injectors???

SAVE THE WAVE

 

I'm a little confused. Supposedly 89 thru 91, Vettes shouldn't use cleaners, but the service bulletin says 87-91 ?????

I have to say, I've been using Techron in my 87 for a lot of years and have 142K with the original injectors so I must not have the Multec, but then why does the Bulletin say 87-91 ????