|
|
|
09-05-2019
|
#1 |
 
Join Date: Feb 2010
Location: Ochlocknee, GA
Posts: 435
|
code 55
I have been trouble shooting a code 55 for the last few weeks. First pulled the fuel pump assy and one of the pumps strainer had come off reinstall removed fuel filter had some dirt , so sent the injectors out for cleaning and flow testing. Came back two inj were dirty, flow was good. reinstall in car ran fine. a week later code 55 again.
Went to section 6E3-A-pg 78 Step 1. ing off remove primary (fp1)fuel pump fuse, ing on. secondary pump runs for 2 seconds. Step 4. attach fuel pressure gauge, showing about 48 lbs pressure. Next step replace O2 sensors . Clear code went for test ride code 55 again. So i need some guidance, one other thing my insta/mileage only shows 5 to 6 miles at any time. avg mileage is working ok. also car has secondary delete option. And i have access to a tech 1a if needed. Thanks John 1990 white/black #2546 one of a few auto eq. 4l8OE ZR-1's |
|
|
|
09-15-2019
|
#2 |
|
Join Date: Feb 2010
Location: Ochlocknee, GA
Posts: 435
|
Re: code 55
I have a question for those who have secondary delete option (1990). When
you use a tech 1 or 1A to look at your engine data list , rpm,coolant temp and other readings, what do you show for power switch while car is running and secondary system. If you do snapshot at WOT what readings do you see for power switch and secondary system. When i go WOT i have a light connected to secondary fuel pump to see if pump comes on, it comes on but it dose not go out until i turn off car. When looking at snapshot data i see O2 sensors readings of 27 left and right. the power switch shows full and secondary system is off. I get code 55. Normal driving is see fuel pressure of 48-50 lbs John 1990 auto 4l8OE eq. |
|
|
|
|
09-27-2019
|
#3 |
|
Join Date: Feb 2010
Location: Ochlocknee, GA
Posts: 435
|
Re: code 55
Update code 55 cleared.
I went through the fuel system and have determined that the primary pump was going bad.It worked fine until you asked for WOT then it would fail. What i also founded out is that the hose clamps were not tight enough to hold fuel as it was leaking when WOT was applied. So with the primary pump going bad and fuel leaking at WOT i would get code 55. So i replaced both fuel pumps and screens, fuel filter, installed carters "y" block, new hoses and correct size clamps for 5/16 hose and 3/8 hose. Checked static fuel pressure, key on,motor off 50 bs. removed FPR hose and blocked plenum vacuum fitting, started car fuel pressure showed 56 lbs. Reconnect everything and made a test run from about 40 mph in 3rd gear (auto 4l8OE). I run a fully automatic trans and gear changes are handled by the compushift (it was new in 2004) controller which is set to shift at 6500 rpm for each gear change. Low shift point as i run 1/8 mile drag race no use in running up to 7000 rpm for 1/8 mile. I hope this helps anyone with a fuel problem, just check everything, take nothing for granted. John 1990 white/black #2546 one of a few 4l8OE EQ ZR-1's |
|
|
|
|
09-27-2019
|
#4 | |
|
Join Date: Jun 2005
Location: CenCoast California
Posts: 899
|
Re: code 55
Quote:
__________________
Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878 |
|
|
|
|
|
09-28-2019
|
#5 |
 
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
|
Re: code 55
 Persistence pays off... too late now but I’d love to know what the amp draw on the failing pump was. H 
__________________
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. |
|
|
|
|
09-28-2019
|
#6 |
|
Join Date: Feb 2010
Location: Ochlocknee, GA
Posts: 435
|
Re: code 55
Hib,
I run 1/8 mile drag racing and for qualifying you make two runs, but they only show 1/8 mile times. So running it out serves no purpose. Now on open track days when i'am testing i'll run the full 1/4 mile and shift at 7000 rpm. Then i can check my 1/8 times also. Hey Hib Roger Vinci says to say hello, i worked with him for about 6 years after i retired from AT&T in 2004. Ccmano, If i remember i was reading about 3.8 amp draw on primary pump only. Plus my clamps on the main feed were leaking at the same time. Replaced the clamps when i replaced the pumps (2) and all is good. John 1990 white/black #2546 one of a few auto (4l8OE) eq. ZR-1's |
|
|
|
|
09-29-2019
|
#7 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
|
Re: code 55
where/how are you reading the pump current? I assume AMMETER in line, but?
__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
|
|
|
|
09-29-2019
|
#8 | |
 
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
|
Re: code 55
Quote:
Each pump should draw 4-5 amperes for a total of 8-10. However, it is recommended that you then pull one of the fuses for one of the pumps and read the draw again. That, and the help of a little arithmetic, you can know exactly what each individual pump current draw is.
__________________
Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
|
|
|
|
|
09-29-2019
|
#9 |
|
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
|
Re: code 55
Is that the single terminal in the loom?
__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
|
|
|
|
09-29-2019
|
#10 | |
|
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
|
Re: code 55
Quote:
H
__________________
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. |
|
|
|
|
 |
|
|
Hybrid Mode
