Hi, Guest
10-27-2013, 04:37 AM
Greetings
I purchased an 04 ZX5 with the 2.0L Zetec for my daughter with 205K. We have been having a problem with a rough idle and just got the code for a lean condition on Bank 1.
What we have done -
- changed the fuel filter, spark plugs, changed the Bank 1 O2 sensor, ran cleaner through the fuel system, cleaned the TB and MAF, checked the EGR valve, PCV valve and have done a quick test for vacuum leaks in the hoses. Checked all ignition wires and plug wires. No issue off of idle so don't think dpfe problem.
My question is - could it be the IAC valve? I have cleaned it from the top of TB and sprayed from inside the intake manifold but have not been able to get to it to take it off. Engine runs fine as soon as off idle so makes me wonder if IAC is stuck open to allow too much air? CEL light did not come on when used for highway driving - only when more intown driving so more idling? When a friend added acetylene to intake at air filter it smoothed out the idle. Or is it more likely a vacuum leak somewhere that I am missing?
Any ideas appreciated.
I purchased an 04 ZX5 with the 2.0L Zetec for my daughter with 205K. We have been having a problem with a rough idle and just got the code for a lean condition on Bank 1.
What we have done -
- changed the fuel filter, spark plugs, changed the Bank 1 O2 sensor, ran cleaner through the fuel system, cleaned the TB and MAF, checked the EGR valve, PCV valve and have done a quick test for vacuum leaks in the hoses. Checked all ignition wires and plug wires. No issue off of idle so don't think dpfe problem.
My question is - could it be the IAC valve? I have cleaned it from the top of TB and sprayed from inside the intake manifold but have not been able to get to it to take it off. Engine runs fine as soon as off idle so makes me wonder if IAC is stuck open to allow too much air? CEL light did not come on when used for highway driving - only when more intown driving so more idling? When a friend added acetylene to intake at air filter it smoothed out the idle. Or is it more likely a vacuum leak somewhere that I am missing?
Any ideas appreciated.