L
Lar99
Guest
'95 LT1 with 140k (stock)
I've narrowed down my bad fuel economy and found that the BLM numbers are getting high when on the interstate. Datamaster histogram shows at engine speeds above 2000 Rpms.
LTerm- about 138-142
STerm- 124-130
Around town and at idle the numbers are great.
The fuel filter has been changed and fuel pressure was checked driving at high engine speed. The air pump is off.
One theory I have is that a Cat is clogged forcing too much EGR gas into the intake causing it be too lean. Backpressure on one side was checked and found to be ok (less than 2 psi at 2000 Rpm).
Another guess is clogged injectors. Can anyone help?
I've narrowed down my bad fuel economy and found that the BLM numbers are getting high when on the interstate. Datamaster histogram shows at engine speeds above 2000 Rpms.
LTerm- about 138-142
STerm- 124-130
Around town and at idle the numbers are great.
The fuel filter has been changed and fuel pressure was checked driving at high engine speed. The air pump is off.
One theory I have is that a Cat is clogged forcing too much EGR gas into the intake causing it be too lean. Backpressure on one side was checked and found to be ok (less than 2 psi at 2000 Rpm).
Another guess is clogged injectors. Can anyone help?
