1997 Honda Civic Hesitation

Do you have a check engine light and when was the last tune-up?

Okay-check and test the airflow sensor, MAP and TPS sensors to include the fuel pressure and comeback with some results

What you need to do is perform the tests I've recommended and come back with results so I can provide you the directions to follow to get to the source of the problem am not into the guessing business its not my style my way is diagnostics-If you're dis-satisfied request for refund-

I have almost 30 years experience with Honda vehicles but information from your first post is not sufficient to make any conclusion. Rasmataz was correct in asking for more information. We are here to help and always give it our best shot and our site says that if you are not satisfied, you can always ask for your money back. Sacarsm would not get you anywhere.

What is the idling speed at cold start and after warming up?
Do the spark plugs have any indication of running rich?
Are the correct spark plug ratings used?
Have the valve clearances been checked?
Do you have any overheating or coolant losses issues?

The reading for the TPS is higher than standard. It should start at 0.5 v and you have 0.59. Readjust the reading to 0.49 - 0.5 and retest.
Does TPS voltage increases smoothly when throttle is opened?

IAC would not cause hesitation. Its main purpose is for idle control.

Hesitation at the speed concerned are either due to O2 sensors, TPS or spark plug related components.

No mention was made about chcking the spark plug wires, get them ohmed and see if they are within specs.

Once again, TPS is out of adjustment at 0.59 volts.

Your first post stated hesitation between idle to 1200 rpm. Latesdt indicates power loss between 1100 to 1750. Both are 2 different things. The latter could be due to a fault with the EGR system.

Check and test the coolant temperature sensor and the oxygen sensors-these sensors controls the fuel looping

I've never heard of O2 sensors failing with out a code.

I've dealt with failed oxygen sensors without popping a code, it doesn't happen all the time been in this business too long to know better-here's my grocery list that will caused a severe hesistation. If you're unsatisfied request for refund as stated-

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard

O2 sensors can fail and not show on a scanner if the scanner is not compatible. It would not trigger the CEL too. I have encountered one such case personally and at least 2 other peraon I know of had the same problem. Tried retrieving for codes and got nothing, wasted 3 weeks trying to figure it out and finally a friend's scanner was able to show the O2 sensor was not working within range.

Your remarks are uncalled for and that shows your upbringing. I would not wish to continue either so I will request our admin to return your money. It is not worth keepng.

Have a nice day, if you are able to with your kind of attitude.

It seems that you're trying to teach us something that we have already know-why don't you teach us something that we don't about oxygen sensors. An oxygen sensor is nothing but a snitcher on the air/fuel ratio. If you wish I can educate you on how a wireless oxygen/HO2 sensor operates with the computer

We probably been dealing with Hondas before you were born and Mr. KHLow is our top dog in this department, come see me over at the Toy dept that's where I hang around at and hit me a few as you wish-

We try our best to help everyone we can, especially our donors. We will be refunding your donation since we were not able to help you this time. Once you get it figured out post your solution here so everyone going forward has more information regarding your problem.