Hi,
Im currently trying to get to the bottom of an issue with High long term fuel trims (+20% give or take) which is showing my car running extremely Lean, struggling with this as the A/F ratio looks ok and o2 looks ok...
I have searched around with Carb spray, washing up liquid for any obvious vacuum leaks but finding it difficult to spot. Dont have access to a smoke test as yet
Symptoms are:
At idle (pictured)
8-10 Hg fluttering between the 2
At 1500 rpm
Drops to 3 Hg, increases to 17Hg drops to 5 Hg then settles back to 8-10 Hg
At 2500 Rpm
Drops to 3 Hg, increases to 18 Hg, drops to 5 Hg then back to 8-10 when idling
3000 rpm is the same
Its at a garage for further diagnostics tomorrow but i want to arm with as much information to shorten lead time before its rectified as much as possible
Any advice or experience would be welcome
Thanks in advance
Im currently trying to get to the bottom of an issue with High long term fuel trims (+20% give or take) which is showing my car running extremely Lean, struggling with this as the A/F ratio looks ok and o2 looks ok...
I have searched around with Carb spray, washing up liquid for any obvious vacuum leaks but finding it difficult to spot. Dont have access to a smoke test as yet
Symptoms are:
- Rough idle
- High LTFT on idle of 25%
- When revved at 1500, 2500 the trims go back to normal
- STFT are fine
- No fault codes
- Oil level is fine
- Air filter is fine
- Spark plugs look good
- MAF is fine
- o2 sensor reading is bang on
- Air fuel mix is nearly bang on
- Feels stuttery to drive on low revs through the gears, open throttle seems normal
At idle (pictured)
8-10 Hg fluttering between the 2
At 1500 rpm
Drops to 3 Hg, increases to 17Hg drops to 5 Hg then settles back to 8-10 Hg
At 2500 Rpm
Drops to 3 Hg, increases to 18 Hg, drops to 5 Hg then back to 8-10 when idling
3000 rpm is the same
Its at a garage for further diagnostics tomorrow but i want to arm with as much information to shorten lead time before its rectified as much as possible
Any advice or experience would be welcome
Thanks in advance