Volvo c70 2001. blown engine. Have now replaced engine/used old throttle body but car difficult to run and hard to start. surging badly will not idle/stalls
Old engine was a 2.4T, replacement engine 2.4T3. Has same sensors and have used throttle body off old engine. Its like accelerator not talking to throttle body through computer. Attach battery and throttle body hums.
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The power brake booster runs on engine vacuum to provide the power assist. Since it surges at idle and you mention that hard brake pedal application causes the surge as well, along with the knowledge that the engine was recently replaced, I'd be looking for a vacuum leak somewhere.
If you had the engine installed by a reputable shop, you should take it back to them assuming it started doing this just after the engine was installed. If they have a smoke machine for locating vacuum leaks, that should make the search even easier.
p0422 and 432 are for the catalytic converters,
the 2112 is for a stuck throttle start here first and do research on this first. ,
if its drive by wire, meaning it uses electricity to move the butterfly on the throttle body (and not a mechanical cable) then clean out the throttle body with a can of throttle body cleaner and have a buddy hit the gas while you visually confirm its opening and closing properly , it has a motor inside there and it could go bad but its rare, it could have junk inside there keeping it from closing all the way too and you might not be able to see it.
the catalytic converter codes are a bit simpler in my opinion. check the tail pipes while its running for sufficent back pressure,
low pressure coming out the pipes means you have a clogged cat
a sulfer smell or a old bad egg smell is a sign of a bad catalytic converter,.
last but not least get a wrench or similar object and tap the cats and listen for a sound indicating that the material inside has broken free. its hard to explain the sound you will hear but it will be more of a rattling sound.
Throttle position sensor is not the only sensor or component involved in Idle, or full speed driving. Remember that on a fuel injected engine AIR is everything. Unless the computer can't send the proper signals to the injectors, fuel ( aside from a bad fuel pump ) is not going to be an issue. Make sure that the other sensors on the throttle body are working fine. Take a look at the throttle body yourself. It's not a hard procedure. Just look at it and run the engine. Is running correctly at all temperatures? As far as the directional signal, you have to trouble shoot that one, but it may not be difficult to find the issue. Check for a loose bulb.
The long warm up suggests the thermostat has failed and is stuck open. The hard cold start is commonly caused by a faulty coolant temp sensor or the wiring connector on it. The idle surging can often be fixed by disassembling the throttle body and cleaning out the carbon build up. Be aware that the throttle body idle control box also has some internal gears that strip, also causing surge.