miles per tank????
#21
RE: miles per tank????
ORIGINAL: CrazyWhiteBoi
Ive got the 3.4 and I fill up about every 200 miles. I did go about 300 miles before, but I figured that was pushing it.
Ive got the 3.4 and I fill up about every 200 miles. I did go about 300 miles before, but I figured that was pushing it.
I get about 23 mpg on a 98 5-speed with 100k on the 3.8L motor.
#22
RE: miles per tank????
my 3.4 only gets about 18 mpg in the city and 22 or so highway. what can i do to increase this. i already have new plugs and wires, air filter, o2 sensors, and cat. any other suggestions?
#23
RE: miles per tank????
96 auto, Drive 104 miles round trip to work. 90% freeway. 65 to 70 on the cc.Fill up after 3 trips, 26 to 28 for the last year. Seafoamed 2 weeks ago and last tank was 29.6. 160k on the clock. Best ever on a trip to Fontana 2 years ago, cruise set at 80 on I5, 33.6mpg.Gonna get headers, new high flow cat and Magnaflo CB see if I can get 30.
O2 sensors replaced last year. Maybe its just a fluke or it was built on Wednesday?
O2 sensors replaced last year. Maybe its just a fluke or it was built on Wednesday?
#24
RE: miles per tank????
Ok, tried a tank of mid grade on the way home and averaged another 27.9 mpg tankful, wife drove a bit and but while I was driving, CC was set @ 75 mph with the air on.
Only mods to the car is an Amsoil multi-layer foam air filter, Flowmaster cat back exhaust and a home made restrictor plate for the EGR valve.
Only mods to the car is an Amsoil multi-layer foam air filter, Flowmaster cat back exhaust and a home made restrictor plate for the EGR valve.
#30
RE: miles per tank????
As we all know, the EGR valve reduces NOx emissions by introducing some exhaust gas into the air/fuel mix. On the '01 Emission system, the EGR also acts as a throttle positioner during deceleration reducing HC and CO emissions.
As I understand, the EGR valve needs to be caliberated if it's been replaced. I could be wrong, but that's what I heard. After replacing my EGR valve I was experiencing a lean surge at 45mph indicating the valve was opening too far. I used my scanner to determine how far the valve was open when the surge accured. I wasn't about to pay Chevy to recalibrate the emission system. So the purpose of the restrictor plate.
I used a gasket for the EGR valve as a template and made the plate from 3/16 stainless steel. I drilled the hole for the exhaust at1/4" and the intake side hole at 5/16". Consideribly smaller then the 12mm or so mainfold opening. The plate goes between the manifold and valve with a gasket on each side. No, I didn't take a pic of it.
I tried blocking off the valve totally, but every time I decelerated the computer would throw a code (forgot the number) 'EGR Valve Not Opening'. Now, no code on decel and no surge at steady light throttle. And as we know, too lean is just as bad for mileage as too rich.
As I understand, the EGR valve needs to be caliberated if it's been replaced. I could be wrong, but that's what I heard. After replacing my EGR valve I was experiencing a lean surge at 45mph indicating the valve was opening too far. I used my scanner to determine how far the valve was open when the surge accured. I wasn't about to pay Chevy to recalibrate the emission system. So the purpose of the restrictor plate.
I used a gasket for the EGR valve as a template and made the plate from 3/16 stainless steel. I drilled the hole for the exhaust at1/4" and the intake side hole at 5/16". Consideribly smaller then the 12mm or so mainfold opening. The plate goes between the manifold and valve with a gasket on each side. No, I didn't take a pic of it.
I tried blocking off the valve totally, but every time I decelerated the computer would throw a code (forgot the number) 'EGR Valve Not Opening'. Now, no code on decel and no surge at steady light throttle. And as we know, too lean is just as bad for mileage as too rich.