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03-24-2007
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#11 | |
 
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: Fuel Injectors
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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03-24-2007
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#12 | |
 
Join Date: Dec 2003
Location: McHenry, Il.
Posts: 6,607
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Re: Fuel Injectors
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WELL-WELL LET ME WELCOME YOU TO THE WINDY CITY CC I KNOW IT WILL NOT BE THE SAME AS THE ROCKIES BUT YOU WILL ADAPT TO BEING A FLATLANDER AND WE STILL HAVE PLENTY OF SNOW AND COLD TO KEEP U FROM BEING TO HOMESICK!! LOL
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http://i119.photobucket.com/albums/o...9mcw/SIG-2.jpg http://i119.photobucket.com/albums/o128/wb9mcw/vcm.gif "The Budget should be balanced, the Treasury should be refilled, public debt should be reduced, the arrogance of officialdom should be tempered and controlled, and the assistance to foreign lands should be curtailed, lest Rome will become bankrupt. People must again learn to work instead of living on public assistance." - Cicero, 55 BC " We the people are the rightful masters of both Congress and the courts, not to overthrow the Constitution but to overthrow the men who pervert the Constitution." - Abraham Lincoln |
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03-24-2007
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#13 |
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Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: Fuel Injectors
Looks like I won't be far from you, Bryan... I bought a place in Grays Lake.
Hans
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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03-25-2007
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#14 |
Join Date: Sep 2006
Location: lone pine and mammoth lakes
Posts: 1,407
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Re: Fuel Injectors
if your engine light comes on at the top of the r range you could be having a secondary vaccume issue. i has your systoms and it was a leak to the manifold dif meter that sits under the ecm..it looks like a mapsensor
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03-25-2007
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#15 | |
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Join Date: Dec 2003
Location: McHenry, Il.
Posts: 6,607
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Re: Fuel Injectors
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Kool---I am puting a vette/radio guys party together for the last sunday in july rain date 1st sun of aug at the McHenry Dam. I'll be sure u get an invite! It was a blast last year but only the radio guys--this year we add the vettes! Afternoon cookout party type of thing! 
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http://i119.photobucket.com/albums/o...9mcw/SIG-2.jpg http://i119.photobucket.com/albums/o128/wb9mcw/vcm.gif "The Budget should be balanced, the Treasury should be refilled, public debt should be reduced, the arrogance of officialdom should be tempered and controlled, and the assistance to foreign lands should be curtailed, lest Rome will become bankrupt. People must again learn to work instead of living on public assistance." - Cicero, 55 BC " We the people are the rightful masters of both Congress and the courts, not to overthrow the Constitution but to overthrow the men who pervert the Constitution." - Abraham Lincoln |
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03-27-2007
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#16 |
Join Date: Oct 2004
Location: Woods Cross, UT
Posts: 389
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Re: Fuel Injectors
You could be losing your secondary fuel pump...basically you're running out of gas because the primary pump can't keep up wit the demand of all 16 injectors...works OK with 8...but 16 is to much of a load...that's why we have two fuel pumps. Make sure you remember to write down the code(s) you get when you get your SES light...so you can post them here...
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Uly Past OWNER 90 ZR-1 #0120 Red/Saddle UT Plate: EZR1DER |
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03-27-2007
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#17 | |
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Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: Fuel Injectors
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 Hans
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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03-28-2007
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#18 |
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Join Date: Jan 2005
Location: New Berlin WI
Posts: 247
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Re: Fuel Injectors
You guys posted some great thoughts on this issue.
I am going to do more testing before I say that the injectors are bad, that was just my first guess. The fuel pump is a good thought too. Where do I start to test that? How can I determine if it is good or bad? I know someone posted it before but what are the part numbers for it, or should I say for that truck pump and the years for that truck pump that works? Well my first step will be to get it running and take it out. I will see what is happening and see if it throws the light. I did notice sometimes, it did not feel like it had full power and it did not throw the light, but a few times it did. I was going to check the vaccuum lines but it appears that the hose is hooked up to the map sensor, but not sure if it is hooked up to the other side. I will check this stuff out and post my results back here. Thanks to all for the ideas and help. |
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03-28-2007
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#19 |
Join Date: Dec 2004
Location: Jacksonville, FL USA
Posts: 4,645
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Re: Fuel Injectors
If the SES light is a "hard" or stored code reading it will give you a starting point. The extra MAP under the ECM is used to verify vacuum to the secondary system and the ECM uses it to turn on the pump as a back up vac source during extended 2* operation, or low vacuum conditions like WOT.
Fuel, if the pumps are not up to it you could get a lean signal from the O2 sensors but I'm not sure if we are in closed loop during 2* operation if WOT is not achieved. 55 psi is the target figure in the KOEO test, and 48 to 55 with the motor at idle speed. Both pumps will run during the KOEO test, you have to pull either fuse to do the KOEO test on each pump. Test primary pump, then secondary pump after teasting both pumps in the KOEO test. You could discon the relays instead of the fuses as the 2*(?) fuse is up by the CDM box and a bit of a PIA to get to. I would change the F/F before doing the pump test. Tom
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1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member |
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03-28-2007
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#20 |
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Join Date: Jan 2005
Location: New Berlin WI
Posts: 247
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Re: Fuel Injectors
Crap, you know, last year I tested the fuel pumps, but I forgot the readings I got.
I thought they were in the good range, but I will test them again first. Unfortunatily, the car is not in a garage right now and its going to be raining all week. I will chevk into that when the weather clears up. Dont worry, I am hopefully going to buy a house this year and will get a garage for it. I hate leaving it outside. But being single, it is hard to find a house I can afford nearby. |
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