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I have a 2002 Honda Civic so with 1.7 engine. Original engine burnt oil so I got another d series engine to swap into. Finished the swap and I have a problem of not being able to go past 4k rpm(rev limit) while in gear (5 speed manual). Low oil pressure light is on but when I try to pull codes the only code I get is PO141 which says is O2 heater circuit along with a 65-40 code??? Any ideas on where to start I am completely lost.

while the engine out I did do the head gasket along with check to make sure the engine was in time. Any help is greatly appreciated!!

🙏🏽

 
Rep Power: 366

what car model?
what was the original engine code?
What is the "new" engine code?

The oil pressure activates the VTEC, if low it could put the ECU in limp mode. Or it could just be the oil pressure wring not connwcted

D17A have VTEC and are low JDM engines brought from Japan
D17A1 are all USDM engines except EX/HX and don't have VTEC
D17A2 are EX USDM models and have VTEC
D17A6 are HX USDM models and have VTEC

If ECU is for VTEC and can't find signals from VTEC, it's gonna go into limp mode. or the oil press sender is not working

 
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model is civic si. As far as i remember the original engine didn’t throw any codes nor a check engine light, the new engine is only throwing the PO141 and the 65-40 but doesn’t run right.

 
Rep Power: 366

in US, so suppose it's a hatch car? Not sedan/coupe?

Wait, 1.7 cannot be a Si. Have the car been imported from Canada?

 
Rep Power: 366

your dash is the same as mine, so what engine did you put in there? Check engine code

https://www.civicforums.com/forums/1...ation-d17.html

 
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Hello!
Car may have come from Canada I am not sure as I am not the original owner. Checked both the original engine and the new engine both are D17A2 both also have vtec i assume then, also did a quick vin look up and it says its a 03 ex coupe with a 1.7 D17A2 in it. On the back of my trunk it says si so that's what I went off. With this information should I start looking at oil pickup???
Thanks again for your help!!!

 
Rep Power: 366

OK, so it is a VTEC engine to a VTEC engine. ECU should not be the issue.
PS: always start with the cheaper or easier options if you can't pinpoint the issue

• check oil levels - low pressure could trigger the ECU to limp mode
• Check the oil pressure sender connections and if the wiring was not damaged during the swap (I know, it's in a painful place to check between the engine/firewall)
• heck, could even be the sensor itself. But not expensive, so...
• VTEC low oil pressure should trigger a limp mode, but do check above, just in case.

The o2 is not supposed to trigger the limp mode, but if above fails...
Get a new OEM o2 - Denso or NTK Honda hates aftermarket sensors, mind you

- 2002 uses the narrow band, so should be not expensive (primary sensor - the secondary is just to check cat healthy)

 
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i know oil levels are good as I just did an oil change used the oil it calls for the on the cap. So I will double check the connections to make sure they are secured. Thanks for the help and will reply back if that doesn’t work 👍🏽

 
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I know oil levels are good as I did an oil change before running the engine after the swap . I will double check the connections to make sure they are all connected and will reply back if I still need help. thanks for help!

 
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I haven't checked connections yet but lets say they are good. Any idea on where i should look next??

 
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You need to verify the oil pressure switch and wiring. Unless you'd like to get an oil pressure tester and actually measure the oil pressure.

 
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heys guys I just tested oil pressure and oil pressure seemed hood, 65psi and about 90psi when throttled up. To me that checks out. Where should I look next??? Thanks in advance

 
Rep Power: 366

as already mentioned, solve the engine code.... post #7.