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Sluggish acceleration

DanpomeroyDanpomeroy Posts: 3
edited September 2 in Honda
I have a 98 Honda Passport. When it’s in drive and I take off from a stop, it’s very sluggish. 0-30 is about 30 seconds. When I put it in low and go through the gears manually, everything seems fine. I‘m trying to make sure I spend the right money to fix it but not sure where to start. Any help is greatly appreciated.

thank you.

Comments

  • I have a 98 Honda Passport. When it’s in drive and I take off from a stop, it’s very sluggish. 0-30 is about 30 seconds. When I put it in low and go through the gears manually, everything seems fine. I‘m trying to make sure I spend the right money to fix it but not sure where to start. Any help is greatly appreciated.

    thank you.

    Maybe I can be of some help.

    Back then the Honda Passport was a rebadged Isuzu Rodeo

    You'll probably find help on some of the Isuzu internet forums cause a lot of southwestern and california owners still have interest in keeping their Isuzu No-Salt trucks going. Honda owners sent them to junkyards*

    Let us know what you find out.
  • thecardoc3thecardoc3 Posts: 5,117
    With any diagnostic routine today, start by pulling codes from all of the modules on the car. It sounds like you are describing the transmission stuck in high gear which is all of the shift solenoids turned off. With a scan tool that supports data you should be able to see what gear is commanded and which solenoids should be turned on to command that gear. Then you have to measure and prove that the voltage command is actually taking place.
  • @Danpomeroy

    Any resolution to the problem drivetrain?
  • Sorry for the delay in posting. I just finished up changing the solenoids. (had to change the intake manifold gasket too) The issue is still there. Still the same symptoms. One new thing though. When it starts shifting weird, I turn it off and back on, issue gone for a while.
  • thecardoc3thecardoc3 Posts: 5,117
    Sorry to hear that didn't work out for you, but I'm not surprised. We have known for years that each and every failure must be tested correctly and on its own merits. That means for the person doing the work, he/she must first understand exactly what the computer is/was seeing that causes it to generate a code and then they have to figure out how to test the circuit/system the exact same way that the computer does. One of the biggest challenges we faced was we knew this and created and adopted routines that let us test the right way. But then still had to deal with the fallout from "experts" who kept trying to tell everyone that all you had to do was pull codes and change parts. They were wrong but we didn't have a voice to try and explain why. What was worse is if the guess of tossing parts happened to work, then we were called everything but honest and competent for that. Then of course also comes the times when the guess actually added an additional problem to the vehicle, that made this kind of work even more challenging.

    What you describe above about it going into failsafe, and then a key cycle restores operation is a classic description of an intermittent issue. Testing that a tech would need to perform would be to monitor the circuit that the computer is seeing fail. I would capture supply power, command side and the current flowing in the circuit simultaneously. Combine that with knowing what gear was commanded when the system faulted and then go back 250 ms (1/4 second) and see what happened. Then reset the testing as required if necessary. If you tell me what code(s) are setting I could explain this in more detail.
  • I had Autozone check for codes and they say there isn't any.

    Another thing I notied that I think is related is it's getting TERRIBLE gas mileage. I just took it on the freeway and it seemed to be doing good, nothing that alarmed me with the transmission. RPMs hovered around 2,200-2,500 at 70 mph. but I was getting about 12 mpg.
  • thecardoc3thecardoc3 Posts: 5,117
    The tools that they use for free code pulls are likely unable to support transmission diagnostics on this system. If this isn't shifting it would be in high gear, all solenoids off as stated previously. This likely requires someone to do all of the testing by hand.
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