Stock fuel pressure? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

eodtech72 · 07-21-2011, 07:02 PM

Couldn't find this with search.... Can someone tell me the stock fuel pressure at idle on a 2010 L99?

Thanks

Streetsweepergto · 07-21-2011, 07:11 PM

4 bar
58psi

eodtech72 · 07-21-2011, 07:13 PM

Not sure what the 4 bar is? I'm getting 62 at the fuel rail at idle. Does that sound correct?

Streetsweepergto · 07-21-2011, 07:15 PM

4 bar = 58 psi.

id say thats about right with 62psi.

whats the problem?

eodtech72 · 07-21-2011, 07:22 PM

I'm working with Ted to figure out a code P0172 and P0175, bank 1&2 rich. Changed O2 sensors (dealer got them for me under warranty), replaced MAF sensor too. Sent Ted some logs today and he says it's a vacuum leak so I got a PVC cap and attached it with an intake coupler and put 15-20 psi in the top end and there are no leaks. It held the air pressure until I removed the hose.... Even removed a vac line to make sure the air came out and it did. I'm out of ideas...
Ted, if you see this got any more suggestions? Or anyone else....

Streetsweepergto · 07-21-2011, 07:24 PM

what modifications are you running?

and are your properly tuned?

i hope you are not paying to replace all these sensors that are easily diagnosable with a volt meter.

vaccum leak would cause a lean reading, not rich reading on the o2's.

that code would be triggered if the fuel trims were pulling fuel.

can you get a datalog of the vehicle at idle or part throttle?

eodtech72 · 07-21-2011, 07:27 PM

CAI Inc. intake, DT long tube headers (no cats), Magnaflow comp. catback and Janetty tune... I'm sure the tune is good since Ted has tuned numerous cars with these mods. Has to be something I'm missing?

Streetsweepergto · 07-21-2011, 07:32 PM

did those codes come up after the tune?

check spark plugs make sure they are torqued correctly and none are misfiring or look funny.

eodtech72 · 07-21-2011, 07:36 PM

No, they were showing up before the headers and tune and with stock tune.... Bought the car used and it had Non-stock plugs which I thought were the problem. They were colder plugs.... Now has stock ac delco's but still showing -25 LTFT's (75%).

Streetsweepergto · 07-21-2011, 07:41 PM

that pcm has only a 25 percent correction anyways.

it could be way richer then that.

B.Buster · 07-21-2011, 08:13 PM

Are you using a catch can?

bmorecam · 07-21-2011, 08:45 PM

I was having the same issue but I had a lean condition at almost +30 LTFT on idle but mine was causing due to vararam intake and my previous tune. After a new tune and its way better.

-25 for you mean that the ecu is trying to compensate for rich condition, completely opposite from what I was going through. What is causing for it to dump fuel like that? hmmmm...

eodtech72 · 07-21-2011, 09:00 PM

No catch can. And as for why it's dumping that much fuel, I wish I could find why. Just got in from the garage with the scan tool hooked up. It's starts out around -25 and then is going to about -10.5. Seems it's highest at startup. One question I have is on the scan tool there is an outside temp reading and it is reading -40 deg. Is there a engine sensor that should be reading that correctly?

B.Buster · 07-21-2011, 09:31 PM

That -40 degree senser could be your prob.

07-21-2011, 07:02 PM	#1
eodtech72 EOD Drives: 2015 ZL1 Join Date: Jan 2011 Location: VA Posts: 205	Stock fuel pressure? Couldn't find this with search.... Can someone tell me the stock fuel pressure at idle on a 2010 L99? Thanks

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07-21-2011, 07:11 PM	#2
Streetsweepergto Drives: CTSV Join Date: Feb 2011 Location: CT Posts: 80	4 bar 58psi

07-21-2011, 07:13 PM	#3
eodtech72 EOD Drives: 2015 ZL1 Join Date: Jan 2011 Location: VA Posts: 205	Not sure what the 4 bar is? I'm getting 62 at the fuel rail at idle. Does that sound correct?

07-21-2011, 07:15 PM	#4
Streetsweepergto Drives: CTSV Join Date: Feb 2011 Location: CT Posts: 80	4 bar = 58 psi. id say thats about right with 62psi. whats the problem?

07-21-2011, 07:22 PM	#5
eodtech72 EOD Drives: 2015 ZL1 Join Date: Jan 2011 Location: VA Posts: 205	I'm working with Ted to figure out a code P0172 and P0175, bank 1&2 rich. Changed O2 sensors (dealer got them for me under warranty), replaced MAF sensor too. Sent Ted some logs today and he says it's a vacuum leak so I got a PVC cap and attached it with an intake coupler and put 15-20 psi in the top end and there are no leaks. It held the air pressure until I removed the hose.... Even removed a vac line to make sure the air came out and it did. I'm out of ideas... Ted, if you see this got any more suggestions? Or anyone else....

07-21-2011, 07:24 PM	#6
Streetsweepergto Drives: CTSV Join Date: Feb 2011 Location: CT Posts: 80	what modifications are you running? and are your properly tuned? i hope you are not paying to replace all these sensors that are easily diagnosable with a volt meter. vaccum leak would cause a lean reading, not rich reading on the o2's. that code would be triggered if the fuel trims were pulling fuel. can you get a datalog of the vehicle at idle or part throttle?

07-21-2011, 07:27 PM	#7
eodtech72 EOD Drives: 2015 ZL1 Join Date: Jan 2011 Location: VA Posts: 205	CAI Inc. intake, DT long tube headers (no cats), Magnaflow comp. catback and Janetty tune... I'm sure the tune is good since Ted has tuned numerous cars with these mods. Has to be something I'm missing?

07-21-2011, 07:32 PM	#8
Streetsweepergto Drives: CTSV Join Date: Feb 2011 Location: CT Posts: 80	did those codes come up after the tune? check spark plugs make sure they are torqued correctly and none are misfiring or look funny.

07-21-2011, 07:36 PM	#9
eodtech72 EOD Drives: 2015 ZL1 Join Date: Jan 2011 Location: VA Posts: 205	No, they were showing up before the headers and tune and with stock tune.... Bought the car used and it had Non-stock plugs which I thought were the problem. They were colder plugs.... Now has stock ac delco's but still showing -25 LTFT's (75%).

07-21-2011, 07:41 PM	#10
Streetsweepergto Drives: CTSV Join Date: Feb 2011 Location: CT Posts: 80	that pcm has only a 25 percent correction anyways. it could be way richer then that.

07-21-2011, 08:13 PM	#11
B.Buster Drives: 2010 AquaBlue 2SS/RS Join Date: Sep 2009 Location: Long Island Posts: 342	Are you using a catch can?

07-21-2011, 08:45 PM	#12
bmorecam Account Suspended Drives: jealous vendors mad!! HAHA!! Join Date: Jan 2011 Location: CYBERGMONSTER@GMAIL.COM Posts: 3,658 View My Garage	I was having the same issue but I had a lean condition at almost +30 LTFT on idle but mine was causing due to vararam intake and my previous tune. After a new tune and its way better. -25 for you mean that the ecu is trying to compensate for rich condition, completely opposite from what I was going through. What is causing for it to dump fuel like that? hmmmm...

07-21-2011, 09:00 PM	#13
eodtech72 EOD Drives: 2015 ZL1 Join Date: Jan 2011 Location: VA Posts: 205	No catch can. And as for why it's dumping that much fuel, I wish I could find why. Just got in from the garage with the scan tool hooked up. It's starts out around -25 and then is going to about -10.5. Seems it's highest at startup. One question I have is on the scan tool there is an outside temp reading and it is reading -40 deg. Is there a engine sensor that should be reading that correctly?

07-21-2011, 09:31 PM	#14
B.Buster Drives: 2010 AquaBlue 2SS/RS Join Date: Sep 2009 Location: Long Island Posts: 342	That -40 degree senser could be your prob.