FraserW
Member
- Posts
- 42
2006 4.2 v8 s/c
So…driving last week I started getting lean bank 1 and 1. This week I’ve started getting rich back 1 and 2. Looking at the ltft it’s -20% ish gets back to zero when I rev it. If I take it a run it runs perfectly. When I sit on idle after it it’s a bit lumpy but get gradually worse until it stalls (unless I rev it).
MAF it’s idling between 5 and 6gs o2’s up and down stream are fluctuating when rev’d upstream going back to zero when held at 1000rpm etc and downstream sitting around 7v falling and rising when rev’d. I’m also getting a low fuel rail pressure code? Low fuel pressure but running rich so in my head someone is not holding back the pressure for the fuel rail but then why does it run perfectly off of idle.
Im still getting a cat efficiency bank 1 and 2.
It’s got me completely confused any suggestions for me to poke at?
So…driving last week I started getting lean bank 1 and 1. This week I’ve started getting rich back 1 and 2. Looking at the ltft it’s -20% ish gets back to zero when I rev it. If I take it a run it runs perfectly. When I sit on idle after it it’s a bit lumpy but get gradually worse until it stalls (unless I rev it).
MAF it’s idling between 5 and 6gs o2’s up and down stream are fluctuating when rev’d upstream going back to zero when held at 1000rpm etc and downstream sitting around 7v falling and rising when rev’d. I’m also getting a low fuel rail pressure code? Low fuel pressure but running rich so in my head someone is not holding back the pressure for the fuel rail but then why does it run perfectly off of idle.
Im still getting a cat efficiency bank 1 and 2.
It’s got me completely confused any suggestions for me to poke at?
. So my understanding of vacuum leaks would be the o2 sensor sensing a lean sate from the unmetered air throwing up a lean code. The ecu has been adding fuel to compensate hat lean mixture giving a +value .
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