Quiksurf
New Member
- Joined
- Jul 3, 2008
- Messages
- 68
- Reaction score
- 0
- Points
- 0
- Location
- Southern NJ
- Vehicle Year
- 1995
- Make / Model
- Ford
- Engine Size
- 3.0
- Transmission
- Manual
From a techinician that can actually fix a truck
first off no baro sensor on that vehicle it is a calculated value that relies heavily on maf but not soley. skewed baro readings can be caused by vacuum leaks, exhaust restriction, misfires etc. not likely maf issue, not likely pcm issue. if you have no codes stored, it might just be a sensation. attempt to nuetralize engine, trans, and exhaust. loosen (do not remove) engine and trans mounts and exhaust fasteners. veh drive and rev. leave in neutral, retorque fasteners, exhaust last. the dealers scan toolcan fow test fuel injectors on obd2 vehicles without removal. compares pressure drop to ms of on time of injector. mode 6 data ( the dealer should know how to read it) will show any history of misfire information. lean conditions can cause a rough idle, but an 02 sensor would trigger a check engine light before you would have a rough idle concern, static compression tests do not always reveal valve train issues. running compression tests are much more accurate when testing valve train issue.
as far a the lean issue, how lean long and short fuel trim values?? going into closed loop? are you hoping the idle surges when spraying god knows what at the intake. get a mechanic with a good scan tool and understanding of how to test for vacuum leaks with artificial enrichment monitor o2 readings not idle surge. if you still feel that there is a vacuum/ unmetered air leak have the dealership smoke test you intake and airbox.
AND MOST IMPORTANT............
ITS A F'N TRUCK. NOT A LEXUS.
first off no baro sensor on that vehicle it is a calculated value that relies heavily on maf but not soley. skewed baro readings can be caused by vacuum leaks, exhaust restriction, misfires etc. not likely maf issue, not likely pcm issue. if you have no codes stored, it might just be a sensation. attempt to nuetralize engine, trans, and exhaust. loosen (do not remove) engine and trans mounts and exhaust fasteners. veh drive and rev. leave in neutral, retorque fasteners, exhaust last. the dealers scan toolcan fow test fuel injectors on obd2 vehicles without removal. compares pressure drop to ms of on time of injector. mode 6 data ( the dealer should know how to read it) will show any history of misfire information. lean conditions can cause a rough idle, but an 02 sensor would trigger a check engine light before you would have a rough idle concern, static compression tests do not always reveal valve train issues. running compression tests are much more accurate when testing valve train issue.
as far a the lean issue, how lean long and short fuel trim values?? going into closed loop? are you hoping the idle surges when spraying god knows what at the intake. get a mechanic with a good scan tool and understanding of how to test for vacuum leaks with artificial enrichment monitor o2 readings not idle surge. if you still feel that there is a vacuum/ unmetered air leak have the dealership smoke test you intake and airbox.
AND MOST IMPORTANT............
ITS A F'N TRUCK. NOT A LEXUS.