96' silverado throws code p1351 - Page 3 - Hot Rod Forum : Hotrodders Bulletin Board
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  #31 (permalink)  
Old 07-16-2011, 04:28 PM
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http://www.flickr.com/photos/65295335@N03/5944563554/

Is this new fuel pressure regulator correct?

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  #32 (permalink)  
Old 07-16-2011, 05:17 PM
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I am going ahead and installing the new injector assembly. I am having a hard time getting each injector to lock into place once I push it into the hole.
Some are snapping into place and are not easily pulled back out. Others arent snapping in. Is it ok to leave them as they are, or will they push back out under operation?
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Old 07-16-2011, 05:43 PM
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OK,looks like you are swapping to the upgraded spider assembly. It has the regulator included.

You may have to clean out the carbon from holes to get them to snap in.

You can buy just an upper plenum gasket set, it will include the fuel line orings and the upper plenum gasket. I would get that for cheap insurance, you don't want any vacuum or fuel leaks.


Good luck!
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  #34 (permalink)  
Old 07-17-2011, 01:04 AM
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I got it all done in a few hours. The actual hardest part was getting those new injectors to lock into the ports. I really would liked to have had a dental pick to clean that carbon out.

Anyways, I cleared the codes, and fired it up. No codes, no fuel leaks, and she was running good. I reused the upper intake gasket/seal since I didnt have another one.
So I took it for a test drive. Tried to get on it as I went around my circle drive, and NEARLY DID A DONUT! Its got power and it responds without even thinking about it. I guess I was used to some pretty bad performance before.

After the drive, I shut it off, and restarted 3 times. Acted like a normal chevy should. No codes still.

I took a bunch of pics of the process. I will try to post them in a post about this swap unless there already is on somewhere.
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  #35 (permalink)  
Old 07-18-2011, 11:27 AM
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I was also curious about how this swap changed the injection method from SFI to MPFI? The instruction sheet for the new injectors said that, referred to this as a conversion. I was just wondering what exactly defines the difference between the two.
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  #36 (permalink)  
Old 07-18-2011, 08:47 PM
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heres a trouble shooting tree for P1351 . It did'nt come out 100 % but it is readable
Attached Thumbnails
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Name:	P1351.jpg
Views:	410
Size:	382.3 KB
ID:	56950  
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  #37 (permalink)  
Old 07-27-2011, 11:16 AM
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Ok. Maybe the final update. I didnt not 'change' anything on the truck over the course of trying to figure out this rough idle, hard start, and p1351. I simply waited for more codes to pop up. Eventually I was getting an occasional 'mifire on #5' code. Then I got 'bank 1 and bank 2 rish' codes. So then I decided on the fuel system.

So thanks to CJ1080, I put in the Delphi injector conversion http://www.amazon.com/Delphi-FJ10565...b_auto_title_3
....and now about 2 weeks later still, problem solved. No rough idle, no codes, and starts like a normal chev, hot or cold.

Thanks everyone!
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  #38 (permalink)  
Old 07-27-2011, 12:37 PM
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Great.....glad I could help someone else like I've been helped many a time before on here! This is truly an awesome place to hang out! Hopefully it stays like this always!!
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Old 08-01-2011, 11:45 AM
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Glad you got it figured out. I wonder if your issue was the FPR or the poppets?

All of this info is contained in this link that I posted.
Repost
http://members.shaw.ca/betterthanyou...g%20Poppet.htm
This is the install procedure for the MPFI upgraded injectors that replaces the stock CSFI poppets, as well as the procedure the dealership will use to try and unstick stock poppets

Both have an Injector Flow rate of 23.1 lb/hr at 58psi(4BAR) of fuel pressure.

Stock CSFI poppets top
Upgraded MPFI Multec 2 replacement bottom


Fuel pressure regulator is at the 12 o'clock position of both spider assemblies.
When replacing the upper intake plenum, its a good idea to lube the seals to help them slide and not roll when reinstalling.

peace
Hog

Last edited by Hogg; 08-01-2011 at 11:51 AM.
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  #40 (permalink)  
Old 10-16-2011, 12:18 PM
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Well, she did it again.
I drove 1mi to the store. No engine light is on. Was in the store bout 5min. Went to start the truck and it tried to fire, coughed for a second and died. No amount of pedal dancin could keep her alive (like worked in the past). So i tried 2 more time, and same thing. It tries to fire, and falls flat.

So I plugged in the code reader. p1351 -Ignition Diagnostic Monitor Input Circuit-

No other codes.
So I cleared that code. And she fired right up like nothing happened. No engine light.

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