Another hesitation S2000
06-05-2016, 05:12 PM
#1
Another hesitation S2000
MY01 45k on the clock. Car runs great till fully warmed up. Say 20 minutes of driving it I start to feel a loss of power throughout the rpm band. While i'm accelerating from a stop there's jerky loss of power sensation. It's not falling flat on it's face but it's not right. I understand that our engines are sensitive to heat. It is not heat soak, nor driver error. I've swapped MAPs, cleaned IAC, adjusted valves, checked TPS with voltmeter, removed throttle body and cleaned MAP port and air channel which was hardly dirty at all. Changed spark plugs, one was loose but was working. Problem persists. I do get a fuel smell every now and then after I shut off the car. I have no CELs and I am leaning towards the upstream o2 sensor. When the car is cool seems to run absolutely amazing. Any ideas would be appreciated.
06-06-2016, 10:36 AM
#3
I don't see many vacuum lines. Also a leak would have to be after the map sensor to affect engine performance I'm assuming. Can you give me some ideas on where to look for a vacuum leak?
06-06-2016, 05:03 PM
#5
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yes After.
chck intake gasket, throttle body gasket, exhaust manifold gasket, map sensor O ring, tps gasket, temp sensor(01-05), iac rubber seal, secondary air pump valve, and > fuel injector o rings( cuz u said u smell gas?) (ur hose maybe punctured but i doubt it unless u did something)
chck intake gasket, throttle body gasket, exhaust manifold gasket, map sensor O ring, tps gasket, temp sensor(01-05), iac rubber seal, secondary air pump valve, and > fuel injector o rings( cuz u said u smell gas?) (ur hose maybe punctured but i doubt it unless u did something)
06-06-2016, 06:55 PM
#6
06-06-2016, 07:13 PM
#7
... so is that a no? (it is possible to remove the screws without a pentacle bit). The iacv tends to stick at the full open and/or close positions and the only way to free it is from spinning the valve. It may not be the cause of your issue but it would be the first thing that I would attend to.
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06-06-2016, 08:26 PM
#10
MY01 45k on the clock. Car runs great till fully warmed up. Say 20 minutes of driving it I start to feel a loss of power throughout the rpm band. While i'm accelerating from a stop there's jerky loss of power sensation. It's not falling flat on it's face but it's not right.
I understand that our engines are sensitive to heat. It is not heat soak, nor driver error. I've swapped MAPs, cleaned IAC, adjusted valves, checked TPS with voltmeter, removed throttle body and cleaned MAP port and air channel which was hardly dirty at all. Changed spark plugs, one was loose but was working. Problem persists. I do get a fuel smell every now and then after I shut off the car. I have no CELs and I am leaning towards the upstream o2 sensor. When the car is cool seems to run absolutely amazing. Any ideas would be appreciated.
I understand that our engines are sensitive to heat. It is not heat soak, nor driver error. I've swapped MAPs, cleaned IAC, adjusted valves, checked TPS with voltmeter, removed throttle body and cleaned MAP port and air channel which was hardly dirty at all. Changed spark plugs, one was loose but was working. Problem persists. I do get a fuel smell every now and then after I shut off the car. I have no CELs and I am leaning towards the upstream o2 sensor. When the car is cool seems to run absolutely amazing. Any ideas would be appreciated.