Experts I Need Your Help, Car Acting Crazy [HP Tuner Log File Inside]
02-07-2005, 12:33 AM
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Experts I Need Your Help, Car Acting Crazy [HP Tuner Log File Inside] I returned my car back to stock today because I will be buying a Z06 in the near future. Now I basically have the stock cam, stock intake, stock tune, stock pulley installed. Still left on the car I have Long tubes, true duals, no cats, no air, no egr and stall
I am getting a really lean condition (A/F 17+) at idle and the car stumbles (sometimes dies). When driving the car the A/F is dead on (for stock) at 14.6. The car idles fine for a few seconds at 14.6 and then drops down to 17 along with the rpms. Even if im slowing down the a/f still stays at 14.6, its only after the car idles for a few seconds that the problem exists. There are no SES or DTC codes reported by the PCM.
The log (see link below) was made after I reset the battery. If you look at 53 seconds into the log it jumps from 0 to 127 mph
with 0 map?
Any ides on this would be greatly appreciated.
HP Tuners Log File
I am getting a really lean condition (A/F 17+) at idle and the car stumbles (sometimes dies). When driving the car the A/F is dead on (for stock) at 14.6. The car idles fine for a few seconds at 14.6 and then drops down to 17 along with the rpms. Even if im slowing down the a/f still stays at 14.6, its only after the car idles for a few seconds that the problem exists. There are no SES or DTC codes reported by the PCM.
The log (see link below) was made after I reset the battery. If you look at 53 seconds into the log it jumps from 0 to 127 mph
with 0 map? Any ides on this would be greatly appreciated.
HP Tuners Log File
02-07-2005, 12:59 AM
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For some reason I was able to download this file here, but not
through hotmail. So anyway...
Huge trims there, like code-setting lean. Is the MAF hooked up?
I forget now what the setup details are but maybe there is some
problem with stock MAF, non-stock table? Did you reflash with the
stock .bin entirely? I can see Cell 19 creeping toward the proper
AFR but it seems to run out of trim range before it gets there.
Higher-flow cells seem to be able to learn in but they are doing it
still with maxed LTFTs and very large STFTs.
through hotmail. So anyway...
Huge trims there, like code-setting lean. Is the MAF hooked up?
I forget now what the setup details are but maybe there is some
problem with stock MAF, non-stock table? Did you reflash with the
stock .bin entirely? I can see Cell 19 creeping toward the proper
AFR but it seems to run out of trim range before it gets there.
Higher-flow cells seem to be able to learn in but they are doing it
still with maxed LTFTs and very large STFTs.
02-07-2005, 01:24 AM
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MAF is hooked up. The tune I used is a stock tune that I used a while back. It is 100% stock except the DTCs are suppressed for !AIR and !EGR codes. It baffles me that it only happens at idle and not when driving. I figured if it was a bad MAF then I would get codes thrown and the A/F would be off all the time? 
02-07-2005, 03:51 AM
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Log your O2 sensor oscillations at idle. If they are lazy you will see faltlining, indicating a lean condition. In this case, increase the O2 Error Base Airflow until oscillation occurs. Do you have a CAM? How big is it?
02-07-2005, 04:02 AM
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Returned to stock, stock cam stock intake stock everything basically....
Heres a link with a hp tuners log
http://www.justech.net/02-06-2005%20...ackToStock.hpl
Heres a link with a hp tuners log
http://www.justech.net/02-06-2005%20...ackToStock.hpl
02-07-2005, 08:19 AM
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02-07-2005, 10:48 AM
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Go out to start it this morning and my SES light is flashing at me. Hptuners tells me....
P0300 - Engine Misfire Detected (SES) (OLD) (History) (Current) (Immature)
P0300 - Engine Misfire Detected (SES) (OLD) (History) (Current) (Immature)
P0404 - Exhaust Gas Recirculation (EGR) Open Position Performance (OLD) (Current) (Immature)
P0507 - Idle Speed High (OLD) (Current) (Immature)
Continuous Tests:
Misfire - Incomplete
Fuel System - Complete
Comprehensive Component - Complete
Once Per Trip Tests:
Catalyst - Incomplete
Heated Catalyst - n/a
Evaporative System - Incomplete
Secondary Air System - Incomplete
A/C System Refrigerant - n/a
Oxygen Sensor - Complete
Oxygen Sensor Heater - Complete
EGR System - Incomplete
P0300 - Engine Misfire Detected (SES) (OLD) (History) (Current) (Immature)
P0300 - Engine Misfire Detected (SES) (OLD) (History) (Current) (Immature)
P0404 - Exhaust Gas Recirculation (EGR) Open Position Performance (OLD) (Current) (Immature)
P0507 - Idle Speed High (OLD) (Current) (Immature)
Continuous Tests:
Misfire - Incomplete
Fuel System - Complete
Comprehensive Component - Complete
Once Per Trip Tests:
Catalyst - Incomplete
Heated Catalyst - n/a
Evaporative System - Incomplete
Secondary Air System - Incomplete
A/C System Refrigerant - n/a
Oxygen Sensor - Complete
Oxygen Sensor Heater - Complete
EGR System - Incomplete
02-07-2005, 06:29 PM
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Look at your misfires-current in real time to be sure you
don't have a single-cylinder problem (like a plug wire come
unseated, etc.). This (dumping unburnt gas and air down
the pipe) could mess up mixture I expect. But I think leakage
is more likely.
With all the demodding is there a chance the EGR is just
left flapping at one end or the other? Lose the manifold
O-ring or like that? Definitely worth a carb cleaner or
propane test.
don't have a single-cylinder problem (like a plug wire come
unseated, etc.). This (dumping unburnt gas and air down
the pipe) could mess up mixture I expect. But I think leakage
is more likely.
With all the demodding is there a chance the EGR is just
left flapping at one end or the other? Lose the manifold
O-ring or like that? Definitely worth a carb cleaner or
propane test.
02-07-2005, 10:30 PM
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Well I took my HP Tuners and hooked it up to check for misfires. I am getting alot of misfires on cyl #1 and cyl#8. I then swapped wires 1 and 5. After swapping the plug wires it made no difference. So I can assume the wires are good. The plugs (NGK TR55) were changed about 100 miles ago. Tomarrow I plan on spraying brake fluid to check for intake leaks.
First Read
Read After Swapping Plug Wires 1 and 5
First Read
Read After Swapping Plug Wires 1 and 5
02-10-2005, 06:21 PM
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Turns out it was a intake leak like you guys said.
The gasket for cyl #1 was not in the grove at the corner and did not make a tight seal.
Thanks everyone for all the help.
The gasket for cyl #1 was not in the grove at the corner and did not make a tight seal.
Thanks everyone for all the help.
