I have a low idle misfire issue. Either at low idle or low load I feel a slight miss every once in a while. Its not enough to cause a major loss in HP but I want to get it resolved before I replace the cats and 02 sensors (cats arent working at full efficiency I registered 127 ppm HC during my last smog) though this might be part of the issue.
here is a list of things I have done so far to resolve the misfire.
timing set properly and tested
fuel injectors cleaned (professionally)
seafoam in the crank case (helps free up lifters that might be stuck)
checked for codes, none present
new temp sensors (3)
coolant air and engine
fuel injector cleaner aditive for extra measure
inspected for maniforld leaks (carb cleaner around gaskets)
block sniffer, checking for exhaust in the radiator, none found (blue liquid)
inspected radiator at operating temp for signs of head gasket seepage (fizzing or bubbling)
inspected oil for signs of coolant leakage
now once under a good load the problem disappears, I've not reinspected the plugs but the last time I ha this issue the plugs looked fine (another 87 but in a non emissions state) and the right bank is a pain to get to so I've been putting it off.
This car is low mileage, 93,000 original has the 302 efi v8 engine and the only TSB that shows was for the sensor on the manifold which I checked and replaced. (Made a little diffrence in overall driveability but nothing for the misfire)
I was a mechanic (apprentice with 2 certs) so working my way around an engine is easy to do, I am willing to try some of the more unorthadox techniques as I am familiar with the safety and risk. But I need to track this down before I replace those cats, I dont want to frag them again and still not have a solution. Those arent fun to replace ^_^
have the same problem?
Monday, January 15th, 2007 AT 6:47 PM