SVO Injector install NIGHTMARE
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Drifting
Joined: Jul 2002
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From: Garden State
SVO Injector install NIGHTMARE
I went through the whole procedure the first time around and everyhting seemed to be OK. No leaks with just the key on and no leaks through 10 min of idle. Took the car for a spin. About 15 to 20 min of very light driving everything seemed to be OK. So I give it about half pedal and then the car starts to sputter. I get to a parking lot and the car goes dead and will not start anymore. So I am forced to put the stock injectors back in the parking lot. I did a quick just so I could get home. I was about 3 miles from my house. I got home but the car felt like it was running on 2 cylinders. So I figured I did the install wrong and proceeded to put the SVO's back in. After doing that about 3x still the car will not start. I checked for leaks, I made sure the injectors where in place, made sure all the electrical plugs were plugged in, and pretty much checked everything I did. What the hell could be wrong. Are the injectors bad? They looked good. Anyone with a slight idea. I am going crazy here. :confused: :mad
Race Director
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From: Palm City Florida
Re: SVO Injector install NIGHTMARE (edv2122)
First of all you must be a super mechanic to do this in the parking lot.. You actually brought tools along with you? :eek:
Ok, this may be painfully obvious but SVO's are not Plug and Play on a stock motor.. Your PCM went ballistic trying to pull back on all that extra fuel. I am guessing you exceeded the -25LTFT limit..
Did you set any codes?
You really need to use a MAFT or reprogram the PCM to handle that big of a change.
Ok, this may be painfully obvious but SVO's are not Plug and Play on a stock motor.. Your PCM went ballistic trying to pull back on all that extra fuel. I am guessing you exceeded the -25LTFT limit..
Did you set any codes?
You really need to use a MAFT or reprogram the PCM to handle that big of a change.
Le Mans Master
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Re: SVO Injector install NIGHTMARE (chuckster)
Im gonna agree with chuck here. I've done this install before, and without tuning via a MAFT or PCM program, they are too much for a stock motor.
You definatly need to check your DIC codes, and/or do an OBD-II diagnostic, to see where you trims are at.
Every engine reacts a little different to mods.
[Modified by kewlbrz, 12:09 AM 2/6/2003]
You definatly need to check your DIC codes, and/or do an OBD-II diagnostic, to see where you trims are at.
Every engine reacts a little different to mods.
[Modified by kewlbrz, 12:09 AM 2/6/2003]
Burning Brakes
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Re: SVO Injector install NIGHTMARE (edv2122)
Probably too much fuel assuming you went with 30-lb units. Ford and GM rate their injectors at different fuel psi. So really a SVO 30-lb injector on a GM motor is higher than the rating because GM fuel pumps have higher psi than Fords.Is the motor stock? You need to run A-Tap or some diagonistic program to find out what the injector pulse width is at WOT with the stock injectors. You should also check the fuel trims.
Le Mans Master
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Re: SVO Injector install NIGHTMARE (edv2122)
Pull your batt cable for about an hour, put your stock injectors back on, reload your stock tune, and all should be back to normal.
Your car does not need bigger injectors.
Your car does not need bigger injectors.
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Re: SVO Injector install NIGHTMARE (rbartick)
You do not need bigger injectors and to run them properly you would have to have the pcm tuned for the larger flow.. :seeya
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Re: SVO Injector install NIGHTMARE (CHRIS NJ C5)
:iagree:
I should add that I doubt you will be able to tune this with your standard Predator tune. You need to tune your closed loop metering and I do not think you can do that with an out of the box Predator. You would need a custom Predator tune or better yet a change to the Injector Flow Rate with LS1Edit. Best bet is to just run the stock injectors. Your duty cycle should not be too bad with the stockers and your current mods.
I should add that I doubt you will be able to tune this with your standard Predator tune. You need to tune your closed loop metering and I do not think you can do that with an out of the box Predator. You would need a custom Predator tune or better yet a change to the Injector Flow Rate with LS1Edit. Best bet is to just run the stock injectors. Your duty cycle should not be too bad with the stockers and your current mods.
Le Mans Master
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Re: SVO Injector install NIGHTMARE (rbartick)
Pull your batt cable for about an hour, put your stock injectors back on, reload your stock tune, and all should be back to normal.
Your car does not need bigger injectors.
Your car does not need bigger injectors.
However, I find the statement is somewhat misleading. It really depends on what your trying to do.
This mod was extremely popular before the days of LS1Edit. It allowed for manipulating fuel trims into the negative region in conjuction with a MAFT. Which made WOT tuning a lot better, and helped add some timing by changing perceived engine loads.
Many still use larger than necessary injectors even with LS1Edit for broader tuning options, when not necessarily needed for specific HP requirements.
GM has played with injector sizing throughout the history of the C5 for various tuning and performance reasons, but also followed it up with programming changes to compliment the change.
With that said, unless one knows what they are doing, I recommend against fooling with injectors.
But there is bennefit beyond a simple HP need.
[Modified by kewlbrz, 10:08 AM 2/6/2003]
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Le Mans Master
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Re: SVO Injector install NIGHTMARE (kewlbrz)
I based my statement on his particular car and his current state of mods. He is not tuning with a MAFT and he does not need to "trick" the PCM into adding timing with different perceived loads. If he really wants to add timing he can use his Predator. Injectors should be replaced because of duty cycle issues, not because you want to trick the PCM into doing something.
FWIW, adding WOT high-load/High-RPM timing to a stock 02-03 Z06 is going to result in a gain of about 0 HP and additional knock signals. Not sure about an LS1 since I've yet to test one of those.
FWIW, adding WOT high-load/High-RPM timing to a stock 02-03 Z06 is going to result in a gain of about 0 HP and additional knock signals. Not sure about an LS1 since I've yet to test one of those.
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Re: SVO Injector install NIGHTMARE (rbartick)
I based my statement on his particular car and his current state of mods. He is not tuning with a MAFT and he does not need to "trick" the PCM into adding timing with different perceived loads. If he really wants to add timing he can use his Predator. Injectors should be replaced because of duty cycle issues, not because you want to trick the PCM into doing something.
FWIW, adding WOT high-load/High-RPM timing to a stock 02-03 Z06 is going to result in a gain of about 0 HP and additional knock signals. Not sure about an LS1 since I've yet to test one of those.
FWIW, adding WOT high-load/High-RPM timing to a stock 02-03 Z06 is going to result in a gain of about 0 HP and additional knock signals. Not sure about an LS1 since I've yet to test one of those.
