Misfire Trouble Shooting
#1
Misfire Trouble Shooting
Has anyone had this happen before?
My 2004 Ford Ranger Edge V6 3.0L is experiencing intermittent misfire and high fuel consumption. I replaced the coil, spark plugs, and cables. I don’t have a check engine light on, and it’s not giving off any codes from the computer. I don’t know what I’m missing to track down this issue.
My 2004 Ford Ranger Edge V6 3.0L is experiencing intermittent misfire and high fuel consumption. I replaced the coil, spark plugs, and cables. I don’t have a check engine light on, and it’s not giving off any codes from the computer. I don’t know what I’m missing to track down this issue.
#2
RF Veteran
iTrader: (1)
Welcome to the forum
Misfires lower MPG because they cause the computer to run the engine Richer, plus engine has less power overall
Compression test should be next
Cold engine
Remove all 6 spark plugs, look at each tip to see if it tells you anything about that cylinder
Test each cylinder, write down results, all should be within 5-8psi of each other
10% is the rule of thumb
Don't use the highest number or the lowest
Add up the 4 "middle" numbers and divide by 4, that give you the average
Say average is 160psi, if another cylinder is 10% less 144psi or lower then its bad
There is a TSB for 2004-2006 Ford Ranger 3.0l engines
They could have recessed exhaust valve seats
TSB seen here: https://www.therangerstation.com/for...n-tsb-05-26-3/
Misfires lower MPG because they cause the computer to run the engine Richer, plus engine has less power overall
Compression test should be next
Cold engine
Remove all 6 spark plugs, look at each tip to see if it tells you anything about that cylinder
Test each cylinder, write down results, all should be within 5-8psi of each other
10% is the rule of thumb
Don't use the highest number or the lowest
Add up the 4 "middle" numbers and divide by 4, that give you the average
Say average is 160psi, if another cylinder is 10% less 144psi or lower then its bad
There is a TSB for 2004-2006 Ford Ranger 3.0l engines
They could have recessed exhaust valve seats
TSB seen here: https://www.therangerstation.com/for...n-tsb-05-26-3/
Thread
Thread Starter
Forum
Replies
Last Post