Hey folks. I'm new on here and to the world of Honda. But here's my problem.

I recently bought a 01 accord type r, it developed a hesitation soon there after. It runs perfect when cold but when it gets up to temperature it develops this hesitation in low revs right through until it hits the vtec. Then it's fine. Doesn't matter if I'm in 1st moving off or 4th trying to accelerate. It still has this problem. If I put it in neutral and rev it it's fine also. It will rev right out. It also seems very down on power compared to my friends standard ep3. It also seem quicker when it's colder

I got it on a ramp and checked around and discovered that around the lambda sensor is very rotten and held together with exhaust sealant. I have a new sensor ordered and have it booked in this week to get the section from the flexi to the cat welded. Just wondering if this is more likely the cause as I've tried to research this problem and could be anything from misfire from the leads or a clogged cat from the answers I'm getting.

Thanks in advance for any help

 

Please tell me you're kidding. Right? lol

 

Ok then daft question

 

No it's not a daft question... not sure what's going on there!

Is this a legit 01 Euro R from Europe? Or is it a North American 01 with an engine swap?

Start with basics, When was the last time a tune up was carried out? Plugs, wires, cap and rotor type stuff.

If this hesitation is engine temp related you should check the engine coolant temperature sensor and the intake air temp sensor. Do you have access to an OBD scan tool? A lot of them have a live data stream function that you can watch to see if there are any discrepancies in sensor data.

That being said, You will really want to get that exhaust fixed before you start looking any further. Specially if it is on the primary O2 (lambda) sensor.

 

Sorry its a UK type r h22a7. They were all changed within the last few thousand miles. I should be able to get an obd from a friend. Also should have said that it isnt throwing up the ECL light? Which I thought an O2 sensor would have....

 

Keep in mind 75% of our members are mostly from the United States, where we weren't blessed with the Euro-R's like you fine people were. We wouldn't know what you were talking about unless you clarified like you did in your last post. Agreed, get your exhaust fixed. The sensors in your exhaust act just like the sensors in your intake do, air flows past them and they send the ECM signals to alter fuel mapping, idle, ignition advancing/retarding, etc. So if half of your adjustment sensors are getting botched signals due to a damaged exhaust your engine will not run to its maximum efficiency.

 

Yes sorry. Should have stated that I was from across the pond. Sweet then. I just thought a o2 would have threw up the ecl light? I picked up a new dizzy at a price I couldn't refuse. So ill put it in for safe measures also.

 

An O2 will only throw up a CEL if it fails or the fuel is rich or lean for an extended period of time. If there is just a little bit of air getting into the exhaust before, or around the O2. It will sense a lean mixture and richen the mixture up to equal out the AFRs. Even when it doesn't really need it. This can cause some driveability issues.

Another question, when were your valves clearances and timing belts last serviced?

 

That would be why its surprisingly hard on fuel then. Valve clearances were done about 5-7k ago. Timing belt was quite a while ago. It should be done in a few thousand miles. But im getting it done in the next week or 2 for peace of mind

 

No sealant will EVER hold up in the exhaust system where the temps will melt the sealant in a matter of minutes. In turn, this will also cause the oxygen sensor to fail as well as the sealant melts across the sensor.

Make sure you either get a Honda oxygen sensor or a Denso oxygen sensor, who happen to make Honda's oxygen sensors. Then get the correct exhaust manifold and exhaust pipe flange gaskets and seal up the exhaust system correctly. They will be crush type gaskets so be careful to tighten the exhaust flange bolts in a criss cross formation and in several stages so it doesn't leak. If you tighten any one bolt too much it could cause the gasket to wind up leaking which will cause oxygen to get in the system which will cause the oxygen sensor to continue enriching the fuel mixture will cause it to fail again.