transmission?

[E]

My Honda Pilot feels like it is almost stalling at a steady speed of around 25 MPR and 50 MPR. The dealership could not find anything. It stopped for awhile now the same problem has returned. Also, my check engine light came on along with the VTM4 light. I pulled over turned the engine off, restarted it, and now the check engine light is only on. does anyone have any idea why my Pilot is pulling back and lunging forward?

[PatrickC1026]

This is the first time that I've heard this kind of problem. You should take it to the dealer when you see the CEL (Check Engine Light). The dealer can read the CEL code and should be able to do a diagnostic test.

I know it's going take a lot of your time, but just take your Pilot and the dealer until they completely fix the car. BTW, how old is your Pilot? In California, we have a lemon law that the dealer has to refund if they cannot fix a new car. It has to be a number of times for the same problem, so you should save all the paperwork.

I'm going to move this thread to Clinical Rounds since it belongs there.

[N_Jay]

My Honda Pilot feels like it is almost stalling at a steady speed of around 25 MPR and 50 MPR. The dealership could not find anything. It stopped for awhile now the same problem has returned. Also, my check engine light came on along with the VTM4 light. I pulled over turned the engine off, restarted it, and now the check engine light is only on. does anyone have any idea why my Pilot is pulling back and lunging forward?

Sounds very much lik ethe bad EGR valve problem that a good number of us have had.
Have the dealer check specifically for this problem.

[Trail Warrior]

E,

The failure of your engine to run smoothly when under a no-load condition, i.e., cruising at a steady speed on a zero grade highway, can probably be attributed to an overly-lean fuel mixture ratio. The lean burn VTec motors are, perhaps, always on the edge of being too lean and the surging symptoms can be initiated or aggrevated by changes in temperature and/or altitude. The sure test is to drive at a steady speed while either pulling/carrying a heavy load or by setting the cruise control on a moderate uphill grade. If it's a lean-burn problem the symptoms will disappear. Curing the lean-burn probably requires a reprogramming of the injector mixture settings. A lean burning engine produces low emissions and increases mileage, but, if too lean can create the surging you have described, and sometimes excessive engine heat.

I hope I'm correct!

Warrior

[PatrickC1026]

^^^ Isn't air-to-fuel ratio set up in ECU?