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Engine performance problem?
Posted 23 February 2005 - 11:32 PM
My question is can this lifter noise be cause of problem.
Codes I have had. MAF (replaced w/rebuilt unit). IAC (cleaned but have no idle problem except when 10 degrees or colder). Vapor purge solenoid (tested and swapped).
Replaced new: O2 sensor, temp sensor, knock sensor, plugs, wires, air/fuel filters.
Swapped: sensors - crank, cam, ignitor, tps, purge solenoid, ecu, coil.
Cleaned and/or tested: tps, fuel pump, injector cleaners, Sea foam into combustion chamber and oil. Cat looked at 3 times, once examining back end, 2 said it was ok 3rd said I needed a new one but I clearly got the impression they needed the work.
Cleaning injectors and combustion chambers seems to have made most improvement.
Seems like I have left a number of things out but I think that covers most of it.
I've done a lot of work on this car and it still seems strong but for this vexing problem. Would like to keep it for another 50K. Appreciate any help.
Posted 24 February 2005 - 02:06 PM
Signals from the O2 sensor are ignored until the engine coolant reaches normal operating temperature. This is because the catalyst needs to be hot to work properly.
SO, I would suspect that something is up with your O2 sensor or circuit. If the new sensor can be trusted, then I think it is likely that you have a GROUND problem. The O2 sensor uses the exhaust piping as ground connection. If it's old and rusty....you need to fit a "three wire" O2 sensor or replace the exhaust. Probably cheapest to get a three wire sensor - the third is the ground.
Posted 24 February 2005 - 04:46 PM
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