_nickjoseph
I'm Awesome
1997 k1500 5.7l, misfires between 45-55 mph. No codes it’s done this even after a tune up and changing a bunch of parts
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
Is it possible that what you think is a missfire is something else? Like a bad u-joint or out of balance tire?1997 k1500 5.7l, misfires between 45-55 mph. No codes it’s done this even after a tune up and changing a bunch of parts
The exhaust makes a choppy sound during this speed and the power reduces, when I let off the gas it no longer acts upIs it possible that what you think is a missfire is something else? Like a bad u-joint or out of balance tire?
You changed the icm and it fixed it? Did You have issues like I’m having?LOL - on my TBI (and other posters too) the ICM went south and caused surging by sending false pulses to the ECM making it think that the engine was revving up to as high as 4800 RPM (on the data log's tach) when it was really ~2000 - 2400. The ECM then would lengthen the injectors' pulse width momentarily which caused the surging.
Sprayed water on mine and nothing happenedYep, that fixed my surging while cruising, a bad coil and dripping injectors (remember this is in a TBI) helped cause my stumble at idle. I found the bad coil by spraying water on it while idling (just the body of the coil, not the connections), it would stumble worse and try to die.
Brand new cap rotor and whole distributorPull the dizzy cap and look for corrosion.