Fuel consumption
Starting Member
Joined: Jan 2022
Posts: 125
From: Canada
Maybe change the PCV valve, and clean the EGR valve and the MAF sensor. These made a noticeable difference for me, and are quick, cheap and easy.
I also noticed improved fuel mileage after replacing the fan clutch assembly.
I also noticed improved fuel mileage after replacing the fan clutch assembly.
Last edited by Stovey; Jul 2, 2022 at 03:03 PM.
New Member
Joined: Dec 2024
Posts: 12
I would perform a fuel pressure leak down test to check for a vacuum leak or other condition that would cause a rich fuel condition. Below is a link to instructions on this site from Captain Hook that has detailed instructions on running the test. If you don't have the tool to perform the test your local parts store will usually let you rent one for free. I'm in the process of troubleshooting the exact same problem on my 2000 ZR2 with no CEL's and engine runs great. Hope this helps.
Fuel Pressure Leak Down Test
Fuel Pressure Leak Down Test
BF Guru
Joined: Dec 2016
Posts: 5,588
From: Moscow, ID
Knock sensors are little microphones that screw into the block. These are monitored for preignition so that the timing can be adjusted by the ECU and prevent damage. They also can adjust the timing so that it can be advanced as much as possible without causing damage to maximize performance.
New Member
Joined: Dec 2024
Posts: 12
Yeah they can also mis adjust your air fuel mix making your fuel economy tank
Knock sensors are little microphones that screw into the block. These are monitored for preignition so that the timing can be adjusted by the ECU and prevent damage. They also can adjust the timing so that it can be advanced as much as possible without causing damage to maximize performance.
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Joined: Oct 2014
Posts: 4,334
From: North Central Indiana
Moderator
Joined: Nov 2007
Posts: 2,185
From: Zurich
What is the mileage driven on each trip?
The lenght (or the shorteness) of the ride, especially in winter time can considerably lower your mpg.
Short trips <8 miles can increase fuel consumption considerably due to the enrichment at cold engine.
What are the average meteo conditions in the period you observed the low mpg?
Cold below freezing?
The 4.3 V6's are terrible on short haul trips in cold weather.
The lenght (or the shorteness) of the ride, especially in winter time can considerably lower your mpg.
Short trips <8 miles can increase fuel consumption considerably due to the enrichment at cold engine.
What are the average meteo conditions in the period you observed the low mpg?
Cold below freezing?
The 4.3 V6's are terrible on short haul trips in cold weather.
Starting Member
Joined: Jan 2022
Posts: 125
From: Canada
Thank-you Error_401, this explains everything.
My engine seems to get about 14 mpg in summer, but in winter it drops significantly. Without my notes, I would say 11 mpg or worse!
This is all city miles and all short trips, about 5 miles. The temperature is below freezing all winter, and averages -20 C or -5 F.
My engine seems to get about 14 mpg in summer, but in winter it drops significantly. Without my notes, I would say 11 mpg or worse!
This is all city miles and all short trips, about 5 miles. The temperature is below freezing all winter, and averages -20 C or -5 F.
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