For the pass week my service engine light has been on had it scanned and came back po171 and 174 banks 1 and 2 lean... I'm pretty sure it may be a vacume leak but not sure if.. has anyone else had this problem??
Check Engine light
- Thread starter SVT Phillip
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i would just punch the light out... my 2 cents.
Well I have thought about that lol it doesn't seem to run bad at all but I'm having my truck pullied and tuned next week didn't know if this was a major issue that I need to fix before moving forward on my mods..
had those two codes a while back and it ended up being a vacuum leak from one of the ports on the plenum that i caped off. there's a rubber hose on the back of your lower intake(lower intake to pcv) that's been know to deteriorate and cause a vaccum leak
Those codes mean a vacuum leak 99.9999999999999999999999% of the time.
Thanks for the input I was pretty sure it was a vacuum leak now just need to find it
You can try and find a vacuum leak a couple of ways...
You can grab a spray can of carb cleaner and slowly spray around the intake manifold and throttle body with the engine running. If the engine speed changes (because you are restoring the air-fuel ratio momentarily) you found the leak!!
Just make sure you go slowly and allow the engine speed to stabilize before moving to the next area.
You can also try pinching each vacuum hose closed until you find the one that changes the engine speed. It's best to begin at the throttle body and eliminate them one by one, then move to any remaining vacuum trees located on the manifold, firewall or fender well.
Good luck trying to find the leak. I have one on my daily driver, 01 F150 v6, that's driving me crazy. Hopefully I'll get a break here soon so I can fix it. It hesitates like a bitch lol.
You can grab a spray can of carb cleaner and slowly spray around the intake manifold and throttle body with the engine running. If the engine speed changes (because you are restoring the air-fuel ratio momentarily) you found the leak!!
Just make sure you go slowly and allow the engine speed to stabilize before moving to the next area. You can also try pinching each vacuum hose closed until you find the one that changes the engine speed. It's best to begin at the throttle body and eliminate them one by one, then move to any remaining vacuum trees located on the manifold, firewall or fender well.
Good luck trying to find the leak. I have one on my daily driver, 01 F150 v6, that's driving me crazy. Hopefully I'll get a break here soon so I can fix it. It hesitates like a bitch lol.
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Don't know if this helps but...
Flash Electrically Eraseable Programmable Read Only Memory
Description
Flash Electrically Eraseable Programmable Read Only Memory (EEPROM) is contained in an Integrated Circuit (IC) internal to the Powertrain Control Module (PCM) . The EEPROM contains the vehicle strategy including calibration information specific to the vehicle and is capable of being reprogrammed or reflashed repeatedly.
As part of the calibration there is an area referred to as the Vehicle Identification (VID) block. The VID block must be programmed when replacing the PCM as described under Programming the VID Block for a Replacement PCM. Failure to perform this procedure may generate fault codes: P1635, P1639, VID Block not programmed or is corrupt. The VID block in an existing PCM can also be tailored to accommodate various hardware/parameter changes made to the vehicle since production. Failure to perform this procedure properly may generate fault code: P1635, Tire/Axle Ratio out of Acceptable Range is one of the main causes for code: P1639. This is described under Making Changes to the VID Block and also under Making Changes to the PCM Calibration. The VID block contains many items used by the strategy for a variety of functions. Some of these items include the VIN number, octane adjust, fuel octane, fuel type, vehicle speed limit, tire size, axle ratio, the presence of speed control and four wheel drive electronic shift on the fly versus manual shift on the fly. Only items applicable to vehicle hardware and supported by the VID block will be displayed on the scan tool.
When changing items in the VID block, the strategy will place range limits on certain items such as tire and axle ratio. The VID block is also limited to the number of times to be reconfigured. When this limit is reached, the scan tool will display a message indicating the need to flash the PCM again to reset the VID block.
Each of the procedures described below use the Worldwide Diagnostic System (WDS) . Reprogramming can be performed by a local Ford dealer for any non Ford facility. There are other Enhanced Scan Tools that may have reprogramming capabilities available. Refer to the manufacturers users manual for details.
Programming the VID Block for a Replacement PCM
A new PCM will contain the latest strategy and calibration level for a particular vehicle. However, the VID block will be blank and will need programming. There are two procedures available. The first is an automatic data transfer from the old PCM to the new PCM and the second is manual data entry into the new PCM.
Automatic data transfer will be performed if the old PCM is capable of communicating. This is done by the use of a scan tool to retrieve data from the old PCM before removing it from the vehicle. The stored data can now be downloaded to the new PCM after it has been replaced.
Manual data entry must be performed if the old module is damaged and/or incapable of communicating. Remove and replace the old PCM. Using a compatible Scan Tool select and execute Module/Parameter reprogramming referring to the manufacturers users manual. Important, make certain that all parameters are included. Failure to properly program Tire Size in revolutions per mile, (rev/mile = 63,360 divided by the tire circumference in inches) Axle Ratio, 4x4/4x2, and/or Manual/Electronic shift on the fly (MSOF/ESOF) may result in codes: P1635, P1639. You may be instructed to contact the "AS BUILT" data center for the information needed to manually update the VID block with the scan tool. Contact the center ONLY if the old PCM cannot be used or the data is corrupt. For Ford L-M technician's, contact your National Hotline or the Professional Technician Society (PTS) web sight for "AS Built" data. Non Ford technicians, use the Fed World website at "fedworld.gov". Select Auto Service Information and search for "Calibrations" or "Vehicle Calibrations" then specify vehicle manufacturer, model name and model year as required.
Making Changes to the VID Block
A PCM which is programmed may require changes to be made to certain VID information to accomodate vehicle hardware. Refer to PCM/Module Reprogramming on the Scan Tool.
Making Changes to the PCM Calibration
At certain times, the entire EEPROM will need to be completely reprogrammed. This is due to changes made to the strategy or calibration after production or the need to reset the VID block because it has reached its limit. Refer to PCM/Module Reprogramming on the Scan Tool.
got the problem fixed last night it was the pcv hose the runs down to the lower intake the rubber elbow was really soft and had wore a hole in it causing my vacuum leak replaced the hose with parts i ordered from the dealer and fixed it in about 3 hours..i did have to remove the supercharger to reach it but wasnt bad i went ahead and cleaned the intercooler while i was there so knocked out two birds with one stone.. thanks for everyones input on the issue i was having im so glad to get ride of that check engine light
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