Gentlemen,
I have my finger on the trigger of the parts cannon.
My truck has random miss-fires on cylinders 1,3 and 4. I have felt it drop cylinders at idle for years now, but the miss-fire counts would clear before setting a code. Otherwise the truck ran good and gave me 19MPG over the highway, and 17.5 MPG around town.
Last year I replaced the spark plugs and wires as routine maintenance, with no impact on the issue. I measured the compression and found significant (about 20%) pressure variation, as can be expected on an old, tired engine. However, the low pressure cylinders did not correlate to the cylinders having miss-fire counts.
As summer here in the northern hemisphere approaches, the warm weather is exacerbating the issue. Yesterday while idling in traffic the engine recorded sufficient miss-fires to trigger the P0300 random miss-fire code. It stumbled through light acceleration and the CEL started blinking until the engine cleared and then the CEL went on to steady. My poor old horse!
I want to replace the injectors. They are stock units with over 370k on the clock. I invite you to pepper me with alternative potential sources of causation, but my main question is where I can get my best bang for the buck on replacement injectors. There are a gazillion options out there. Some are so cheap it's ridiculous! New ones from the dealer are obscene! How about some proven alternatives that won't break the bank?
RockAuto offers some new Standard Product injectors for $70usd. I'm wondering if that is a good option???
Thanks in advance for your opinions,
Rick
I have my finger on the trigger of the parts cannon.
My truck has random miss-fires on cylinders 1,3 and 4. I have felt it drop cylinders at idle for years now, but the miss-fire counts would clear before setting a code. Otherwise the truck ran good and gave me 19MPG over the highway, and 17.5 MPG around town.
Last year I replaced the spark plugs and wires as routine maintenance, with no impact on the issue. I measured the compression and found significant (about 20%) pressure variation, as can be expected on an old, tired engine. However, the low pressure cylinders did not correlate to the cylinders having miss-fire counts.
As summer here in the northern hemisphere approaches, the warm weather is exacerbating the issue. Yesterday while idling in traffic the engine recorded sufficient miss-fires to trigger the P0300 random miss-fire code. It stumbled through light acceleration and the CEL started blinking until the engine cleared and then the CEL went on to steady. My poor old horse!
I want to replace the injectors. They are stock units with over 370k on the clock. I invite you to pepper me with alternative potential sources of causation, but my main question is where I can get my best bang for the buck on replacement injectors. There are a gazillion options out there. Some are so cheap it's ridiculous! New ones from the dealer are obscene! How about some proven alternatives that won't break the bank?
RockAuto offers some new Standard Product injectors for $70usd. I'm wondering if that is a good option???
Thanks in advance for your opinions,
Rick