Question about 1997 Jeep Grand Cherokee

3 Answers

My 1997 jeep grand cherokee keeps knocking off. it happends more when I press the brake. It will not start right away but usally will after some time. I have had the crank shaft and cam shaft sensor replaced as well as the computer (electronic box) under hood. It ran fine for a week and has started the same thing again. it will start sputtering while driving and then cut off when you press the brake. I am at my wits end..can you suggest anthing?

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  • beachwatts May 12, 2010

    I spoke with my mechanic who stated all the things he suggested have been tried and he stated that the problem is a definate electrical one and not fuel or transmssion.

  • beachwatts May 12, 2010

    nothing has shown up on the dash

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3 Answers

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  • Jeep Master
  • 17,970 Answers

Check the vacuum system, any hose leak and EGR, MAF/MAP sensors. When thet vehicle shutoff when you apply brakes, sound as vacuum leak.

Try it and tell us news.

Posted on May 12, 2010

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  • ZJ Limited
    ZJ Limited May 12, 2010

    Since they are power assisted brakes (vaccuum) sounds like that is
    bogging the engine to the point where it stalls. Could be low idle or
    Throttle position Sensor (TPS) remove the two screws and clean the shaft
    and point off with a old tooth brush and some throttle body cleaner.
    If this does not help have the throttle body cleaned.

  • beachwatts May 12, 2010

    i will have my mechanic try that..this is not a persistant problem..the vehicle wil do this today then maybe a week before it does it again..does that make sense?

  • ZJ Limited
    ZJ Limited May 12, 2010

    At the
    time of this failure, I suggest making a code scanning to determine what
    fault code you have there.


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  • Master
  • 1,341 Answers

If it is an electrical problem it should trigger a check engine light or maintenance light on the dashboard.Have you got one showing up?

Posted on May 12, 2010

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  • Jeep Master
  • 19,396 Answers

Hi.

The problem looks quite unusual. Try to understand if the engine is turning off because of an electrical problem cutting power to injector and distribution, or because of low idling, incorrect mixture settings or because of automatic transmission shifting into the wrong gear.

The first thing I can think of is a bad crank shaft sensor, but you said this had already been replaced.

If the problem is happening like a sudden electrical shut down, check ECU ground, check wiring that can be involved for occasional shorts (eg. ABS circuit and module, brake light circuit etc.).

If the engine is chocking , or shutting down because of an incorrect mixture, check MAF and AIT sensor. This sensors determine the fuel mixture. A rich mixture can cause engine flooding and turning off with misfire, an excessive lean mixture will cause a similar effect. This problems will usually result in a OBDII code stored in the ECU (at least misfires or mixture related codes reported by O2 sensors).

Test fuel pressure and vacuum system pressure. Vacuum leaks can cause the engine shutting down, and may have particular influence when idling.If problem happens only at idle, check IAC valve.
If problem is accompanied by erratic revving, also have a look at EGR valve.

The first thing to do would be scanning for codes. I guess that this had already been done by mechanics.
If there are no codes stores, start testing from MAF sensor.

A good thing to do would also having a mechanic present when the problem occurs. A professional listening to the engine can tell you why the engine is shutting down.

Also ensure that the problem is not caused by an auto transmission shifting into wrong gear. In that case testing will start from TPS sensor. Common cause for this kind of problem.

Regards.


Posted on May 12, 2010

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