LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

SES code for MAF, because of intake elbow? *Shoebox i need your help*

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Old Nov 28, 2004 | 09:32 PM
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SES code for MAF, because of intake elbow? *Shoebox i need your help*

I got my car scanned and it came up with 3 SES codes, 1) CODE 48- Mass Air Flow Failure, 2)Code 83-Torque converter and module, 3) Code 16- Low Resolution Pulse Failure.

I have an idea why the CODE 16 came up, probably because my car has Accel 30 pounders in it, if that is the case should i get them tooken out and replaced with stock injectors or is it better to retune the computer for it? Im not looking to upgrade the whole fuel system, and its a daily driver.
The guy that scanned my car said he thinks the MAF code is because i have a larger intake elbow, and he said if i bought a granatelli it would correct the problem because of the granatelli's larger diameter. Is this true, or not? Either way i replaced the MAF sensor like 5 months ago, when it crapped out. Code 83 i have no clue about though.
Any help would be great fully appreciated, since i have no clue.
Old Nov 28, 2004 | 10:52 PM
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Re: SES code for MAF, because of intake elbow? *Shoebox i need your help*

48 Mass Air Flow (MAF) sensor circuit
Check the pink wire for 12v with the key ON and make sure the black wire has a ground on it. Stick with the stock MAF.

83 TCC PWM Solenoid Circuit Fault (automatic transmission)
Indicates a transmission solenoid problem. Check for power at the proper pins at the transmission connector. Schematics are on my website.

16 Distributor ignition system (low resolution pulse)
This would be a stored code if your engine was running. It won't run without the low resolution pulse from the opti. Could be your opti is on the way out.

None of these have anything to do with injectors as far as I can see.

Don't make double posts. Delete the other one. You really limit the help you might get by calling someone out. If you have a post that you would like someone to look at, send them an email with a link to the post.

Last edited by shoebox; Nov 28, 2004 at 10:55 PM.
Old Nov 28, 2004 | 11:32 PM
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Re: SES code for MAF, because of intake elbow? *Shoebox i need your help*

Thanks, i tried to delete this one, i did not like the calling out thing either, but i could not figure out how to delete it. Thanks ill try your info, but i just replaced my opti, and i had the code b4 i replaced the opti. Is it an old code or no?
Old Nov 28, 2004 | 11:35 PM
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Re: SES code for MAF, because of intake elbow? *Shoebox i need your help*

And would these codes hinder power, or performance?
Old Nov 28, 2004 | 11:59 PM
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Re: SES code for MAF, because of intake elbow? *Shoebox i need your help*

Did you "clear" the old DTC 16 after you replaced the Opti? If not, its going to stay stored in the PCM for a while, until you have completed a pre-determined number of drive cycles without the problem coming back. With key off, pull the "PCM BAT" fuse on the end of the dash panel for 30 seconds.

Find a new mechanic. If you are really running 30# injectors without the correct tune, get it tuned. Injector size has nothing to do with DTC 16, or any of the others, but running oversize injectors without the proper PCM tune has got to have it running insanely rich, probably rich enough to start washing down the cylinder walls and causing severe damage.
Old Nov 29, 2004 | 08:24 AM
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Re: SES code for MAF, because of intake elbow? *Shoebox i need your help*

Originally Posted by 9T4Z28
Thanks, i tried to delete this one, i did not like the calling out thing either, but i could not figure out how to delete it. Thanks ill try your info, but i just replaced my opti, and i had the code b4 i replaced the opti. Is it an old code or no?
Deleting is as simple as clicking edit on your post. The first thing that comes up is the delete confirmation.

I see that your other post (same as this one) has gotten at least one response as well. It makes it real confusing for people to try and help.

You should have also included pertinent info in your original post (like opti has been recently replaced). It can only make it easier for people to help.
Old Dec 2, 2004 | 02:34 PM
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Re: SES code for MAF, because of intake elbow? *Shoebox i need your help*

Thank you Shoebox and Injuneer, i appreciate your patience and your insight very much!
Old Dec 2, 2004 | 02:50 PM
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Re: SES code for MAF, because of intake elbow? *Shoebox i need your help*

As injuneer stated, YOU WILL wash down your cylinder walls. Unless you have lowered your fuel pressure with a regulator, but I don't see how you can tell exactly how much fuel they'd be pushing... Just curious why did you want new fuel injectors?
Old Dec 2, 2004 | 09:54 PM
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Re: SES code for MAF, because of intake elbow? *Shoebox i need your help*

The injectors were in the car when i bought it, im presuming he used the higher injectors becuase there was a NOS setup on the car. I want them out. But would tuning recorect this problem or is getting stock ones the only way to go?
Old Dec 3, 2004 | 01:03 PM
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Re: SES code for MAF, because of intake elbow? *Shoebox i need your help*

None of the codes have anything to do with running rich. If the engine isn't running rich, it's likely that is was properly tuned for the 30# injectors. Unlikely he would have added the 30's because of nitrous... a wet kit doesn't need added flow through the injectors, and the most popular dry kit uses higher fuel pressure to increase the flow through the stock injectors.

In any case, swapping in stock injectors is not going to cure MAF, tranny and the low res pulse from the Opti.

Just curious... have you at least tried Shoebox's suggestion and checked for +12V at the MAF sensor?

Having 2 threads going concurrently on the same problem is really getting confusing. Maybe you could PM or e-mail Brent and ask him to "merge" the threads.
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