How to adjust injectors
Team Owner
Joined: Jul 2004
Posts: 28,432
Likes: 3,285
From: Hartford WI
Injectors should have characteristic curves that vary slightly from one brand to the next. I got my OEM Delphi units from a Corvette shop that replaces injectors regularly. They told me that in their experience, using other than OEM injectors can create idle and other issues. Not a big deal, but there nonetheless.
Ethanol fuels existed in the 1980s and onward. My OEM injectors from the factory lasted 26 years before at least one failed open and let too much fuel pass. Could even have been a clog or varnish build up for all I know. But 26 years is good enough for me. Maybe OEM injectors from the 1980s and 1990s fail from ethanol eating away the wire insulation, but I doubt it. If that were the case, millions of cars would have had failing injectors, and either a recall or class action suit would have ensued.
To each his own, but I like to go with OEM equipment when possible, since that is what the car was designed, prototyped, tested, tweaked and produced with. My two cents...
Ethanol fuels existed in the 1980s and onward. My OEM injectors from the factory lasted 26 years before at least one failed open and let too much fuel pass. Could even have been a clog or varnish build up for all I know. But 26 years is good enough for me. Maybe OEM injectors from the 1980s and 1990s fail from ethanol eating away the wire insulation, but I doubt it. If that were the case, millions of cars would have had failing injectors, and either a recall or class action suit would have ensued.
To each his own, but I like to go with OEM equipment when possible, since that is what the car was designed, prototyped, tested, tweaked and produced with. My two cents...
IDK but it was a known issue about the Multec injectors that cooled the coils with fuel. Later redesigns might have cured the issue but hard to say if there has been any flow difference. Google "Multec Injector Problems". IIRC, GM had Bosch and/or maybe Lucas before they switched? Not sure exactly when they did. http://www.johnstonauto.com/news/Tec...orCleaning.pdf mentions it. Not sure but it seems to be from the Almighty GM
You forgot one important thing. Built with the most short term cost effective parts that comply with CAFE and if you are happy with what they produce, so be it. Sorry but I can't buy into the FANTASY that GM crafted a car that was the best it could be, govt and profit be damned.
Last edited by aklim; Oct 2, 2016 at 12:18 PM.
Racer
Joined: Mar 2013
Posts: 462
Likes: 98
I have heard things like that. Usually, not always, usually they are from a place that doesn't understand what they are doing. They only know how to follow the book without understanding what they are trying to accomplish or the principles behind the operation. That or they are trying to palm off more expensive items to the clients. Most of the performance shops I have run into don't seem to have that issue that I know of. Is this some place of great repute or is it some shop that has done work on Corvettes? Who is this place exactly? What is it they do? Can they give us an estimate on what the difference is or are they just guessing?
IDK but it was a known issue about the Multec injectors that cooled the coils with fuel. Later redesigns might have cured the issue but hard to say.
You forgot one important thing. Built with the most short term cost effective parts that comply with CAFE and if you are happy with what they produce, so be it. Sorry but I can't buy into the FANTASY that GM crafted a car that was the best it could be, govt and profit be damned.
IDK but it was a known issue about the Multec injectors that cooled the coils with fuel. Later redesigns might have cured the issue but hard to say.
You forgot one important thing. Built with the most short term cost effective parts that comply with CAFE and if you are happy with what they produce, so be it. Sorry but I can't buy into the FANTASY that GM crafted a car that was the best it could be, govt and profit be damned.
I don't buy the often stated opinion, unsupported by any evidence or study, that OEM injectors from that era had some epidemic of ethanol induced failures. Had that happened, and ethanol fuels have been around since the early 1980s, either a massive recall or class action suit or both would have ensued. A few people having injector problems and then deciding it must be the ethanol in the fuel does not stack up factually. And let's recall gasoline on its own is a fine solvent.
If you want to experiment with aftermarket parts in your Corvette by all means go right ahead. But no need to get nasty with those of us who are happy with what the factor and GM engineers did, and simply want to keep that train rolling.
Team Owner
Joined: Jul 2004
Posts: 28,432
Likes: 3,285
From: Hartford WI
Wow, let's take a nice deep breath and ease back a little. I was only suggesting that GM designed and built the car with the OEM Delphi injectors. Many hours of prototyping and testing went into that before a production decision was made. The GM engineers had to balance CAFE, emissions, cost, and so on. What they came up with worked well for 26 years in my own limited experience. So, I wanted to simply put in what worked.
I don't buy the often stated opinion, unsupported by any evidence or study, that OEM injectors from that era had some epidemic of ethanol induced failures. Had that happened, and ethanol fuels have been around since the early 1980s, either a massive recall or class action suit or both would have ensued. A few people having injector problems and then deciding it must be the ethanol in the fuel does not stack up factually. And let's recall gasoline on its own is a fine solvent.
If you want to experiment with aftermarket parts in your Corvette by all means go right ahead. But no need to get nasty with those of us who are happy with what the factor and GM engineers did, and simply want to keep that train rolling.
I don't buy the often stated opinion, unsupported by any evidence or study, that OEM injectors from that era had some epidemic of ethanol induced failures. Had that happened, and ethanol fuels have been around since the early 1980s, either a massive recall or class action suit or both would have ensued. A few people having injector problems and then deciding it must be the ethanol in the fuel does not stack up factually. And let's recall gasoline on its own is a fine solvent.
If you want to experiment with aftermarket parts in your Corvette by all means go right ahead. But no need to get nasty with those of us who are happy with what the factor and GM engineers did, and simply want to keep that train rolling.
So why do you think GM issued TSB http://www.johnstonauto.com/news/Tec...orCleaning.pdf.
Acutally, I'm merely stating my point. Sorry you interpreted it as being nasty. As to experimentation, no thanks. I go with proven solutions unless there is some compelling reason for some radical new product. The other injectors have been "guinea pigged" by many others.
Last edited by aklim; Oct 2, 2016 at 12:30 PM.
Racer
Joined: Mar 2013
Posts: 462
Likes: 98
IIRC, Multecs were there AFTER at least either Bosch or Lucas.
So why do you think GM issued TSB http://www.johnstonauto.com/news/Tec...orCleaning.pdf
Acutally, I'm merely stating my point. Sorry you interpreted it as being nasty. As to experimentation, no thanks. I go with proven solutions unless there is some compelling reason for some radical new product. The other injectors have been "guinea pigged" by many others.
So why do you think GM issued TSB http://www.johnstonauto.com/news/Tec...orCleaning.pdf
Acutally, I'm merely stating my point. Sorry you interpreted it as being nasty. As to experimentation, no thanks. I go with proven solutions unless there is some compelling reason for some radical new product. The other injectors have been "guinea pigged" by many others.
Anyway, thanks for the information. I'm sure the OEM or not OEM discussion will go on forever...
Team Owner
Joined: Jul 2004
Posts: 28,432
Likes: 3,285
From: Hartford WI
OEM is better SOMETIMES. When compared to cheap junk, OEM is better. Unfortunately, to complicate issues, OEM is also by the cheapest vendor which means that it could be re-boxed cheap junk at a marked up price. Sometimes, it starts out good and then moves to some reduced standard crap. Point? Caveat Emptor. Ask yourself "What have you done for me LATELY?". Or as the investments ads state "Past performance is NO GUARANTEE of future results".
Signed
The skeptic
