I've replaced my dead USDM engine with a JDB engine. Since the swap, the car has constanly been giving me misfires on all 4 cyclinders and always had a rough idle (however, only when warm). The car shakes a bit only when idling and hot. The shaking is sometimes more stronger then at other time but it only happens when the engine is hot. On the highway it runs fine, though I'm getting very bad mileage.

I've changed the:

TB, distributor,
all 4 injectors,
both O2 sensors.

I've Cleaned the EGR and Cleaned intake valves from carbon buildup,

I've checked timing belt 3 times.


I do have a problem with the dash (the lights go away for weeks and then suddenly come back again). Also, the odometer stopped at 350,000 (before I changed the engine). Speedometer and other gauges work fine.

Wondering if this is a VSS (vihicle speed sensor) problem that' causing the misfire on all 4 cylinders. The misfire does not show up right away. The check engine light comes on only after driving on the highway and flashes every often only when driving above 120 km/h.

I'm completely clueless. I've shown this to 3 different mechanics and everytime they ask me to change something I did, but the misfire and rough idle persists. No other codes show up.

Any help would be much appreciated.

Thanks

 

you basically changed/cleaned all the stuff that i was gonna tell you too...
i dont think the speed sensor got anything to do with the misfire/bad idle...
are you throwing any codes? (check engine)

 

The only code I get is for multiple misfires. No other code. I know that I've done all the stuff that most mechanics would suggest and now I need an expert to help me diagnose this mystery. I'm now thinking about the Knock sensor, Crank Sensor and maybe the alternator (since my car stalls when Idle sometimes though very rarely. Most of the time it just seems like it will stall but it's the idle just jumps back up again (causing the shaking in the engine).

Someone suggested that my ECU is not compatible with the JDM engine (but I've used all the USDM sensors). Plus the 3 sensors on the TB have been changed with the TB.

 

change the electrical half of your ignition switch

 

Before replacing anything else you need to check and adjust the valves. Or have a good mechanic do it. And not one that just replaces the valve cover gasket then says they adjusted them. If the motor has over 150k its time adjust them and see what happens. I know you cleaned the EGR but just make for sure it is not sticking open just a little.

 

do a compression check....
your motor will run gay if you dont have the right pressure/compression...



http://www.dummies.com/how-to/conten...mpression.html

good luck....

 

Compress check done; it's 180 on all four. EGR not sticking, Complete distributor was changed.

Someone in another forum pointed out that TDC sensor. Apparently, the position changed from Crank to the Distributer or vice Verse. Could it be that the mechanic left a sensor dangling around since he didn't have a place to put it?

 

You do not have a crank sensor. You must do the crank sensor bypass at the ecu. Sometimes this doesnt work though, and you still get the codes onthe highway. Same thing with my jdm swap without the jdm ecu. You need a new pump with crank sensor installed.

 

Check your cat. If you have a clogged catalytic converter it will cause miss fires and idle issue when the car is warmed up. easiest way unbolt it and check to see if it is clogged. Check exhaust flow at the muffler and rev the engine to see if the exhaust flow is normal or if it feel restricted.

 

I can't find the wiring in the engine bay for the CKF sensor. Can someone with Honda Oddyssey please take some pictures of the wire that goes to the CKF sensor? I've already purchase an oil pump and CKF sensor but I can't find the place to plug it in.

 

This

 

Well, I do get a code P1491 - Valve lift insufficient (EGR valve problem). But i don't think that's going to cause misfires on all 4 cylinders. I've already cleaned the EGR valve so why is the ecu throwing this CEL? I also checked to see if it's working properly.

 

Have you adjusted the valves yet?

 

dude man. you need to check out why it is throwing an egr code. It can be sticking intermittently. and yes a egr valve open at the wrong time or too much can cause missfires.

 

The distributor you but on it could be bad !!!!! Was it a brand new one or recondtioned or used ? What about your plug wires u try changing them as well ?