Question about Pontiac Trans Sport

3 Answers

I have a 1998 Pontiac Trans Sport. Within the past 30 days the van has had a tune-up, oil change and has been running the best it has since we purchased the vehicle over a year ago. The vehicle will start/turn over, but it runs extremely rough and for only 10-15 seconds per start. We are using the same gas as always and our driving habits/routines have not changed. I hope this is a simple timing issue that requires us to replace a sensor. Please help-thanks!

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  • Muncle95 Jul 28, 2008

    In addition to the problems in my original post, the Trans Sport has 178000 miles, the engine is clean, all fittings/hoses are tight and show no sign of leaking. The spark plugs, air filter, plug wires, oil filter, oil, and fuel filter have all been replaced within the past 30 days or so. Earlier today the van was running fine until the afternoon. When I started the vehicle the engine was "ticking"-I incorrectly assumed that the ticking was the engine either warming up, or the oil simply hadn't reached the valves. I pulled out of the driveway, drove the van for about 120 feet when the car shook momentarily then suddenly shut off. When I restarted the vehicle, the engine would turn over but would run EXTREMELY rough for only 10-15 seconds per start attempt.

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3 Answers

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  • Master
  • 6,966 Answers

Hi,

Your concern "cranks but will not start", most probable reason is there is no spark, no ignition. The "we smelled fuel" indicates that the engine is getting fuel but is not being burned. Areas to check would be the ignition system then which includes;

  • distributor;
  • distributor cap;
  • ignition module;
  • ignition coil;
  • ECU/ECM.
Initially, determine the presence of IGN B+12, thereafter, remove one of the plugs, reconnect the sparkplug wire and let the removed plug lay on any metal top of the engine, crank the engine, there should be spark.

Other areas that might have to be checked would be your alarm, security or immobilizer.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jul 28, 2008

  • Louie  Role
    Louie Role Jul 28, 2008

    Hi again,



    My apologies, the initial reply was meant for another concern.



    To your concern, initially pls have your injectors and/or the EGR valve check.



    If the "ticking" sound is mechanical (metal to metal) and follows a pattern or affected by the RPM, then pls have your valves checked.



    If the "ticking" sound is softer (dampened) and does not follow a pattern and is not affected by the RPM, then pls have your relays checked.



    Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

    Good luck and kind regards.

    Thank you for using FixYa.

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  • Master
  • 373 Answers

Hi...
Your problem loo like A Crankshaft or Camshaft sensor.
Your car use 2 crank sensors. on a 3.4 L. engine.
1 in the front cranshaft pulley. the other right side of the engine or BANK 1 on the engine block
or Missfiring at ramdom Cylinders.
The first step That I can recomend. Is: Check if the vehicle was not OVERHEATED. Because a overheated engine can give this problem. Noise and Rought idle.
But check for any Vacuum leak on the intake manifold. and throttle body. Inspect the the AIR FLOW meter.
The rubber hose going to the throttle body. the PCV. in the front Valve cover. and all the hoses.

But The best STEP is : get the car Scanned with DIAGNOSTIC COMPUTER. After that you will able to know exacttly what step you need to do to fix. Some Auto parts. they scann the vehicles with no charge for that.
Ok I hope this information help to start diagnostic your vehicle.

Posted on Jul 28, 2008

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  • Pontiac Master
  • 19,396 Answers

Try replacing sparks, che air filter and replace fuel filter. You can buy these at any car part shop.

Posted on Jul 28, 2008

  • Ginko
    Ginko Jul 28, 2008

    Try replacing sparks, if one of the sparks is gone, engine does not start on all cylinders, then stops.

    check air filter, if is very dirty the engine may die at start and replace fuel filter, if it is dirty the engine can turn down suddenly. You can buy these at any car part shop.
    If these maintenance does not fix it take it to a garage and check fuel and distribution, also test car ECU (computer).


  • Ginko
    Ginko Jul 28, 2008

    A FI or typical valve tick noise would change depending upon engine revs, You understand if the noise is coming from valves or camshaft from its frequency change.
    The distributor also can make a ticking noise that is variating with speed.
    If The car is suddenly not starting at all more than the camshaft it is probably the distribution.
    If the problem is with distributuion the car won't fire on all cylinders, sometimes you can fix this by replacing distributor cap.
    If the problem is camshaft, valves or injectors (yes, they can make ticking noise too), the best thing to do ig going to a garage and having the car computer (ECU) connected to a scanner for a checkup.
    This will return an error message to diagnose the problem more precisely.

    Check also if the ticking noise is coming from starter motor not engaging or not running, if this is the cause, then it will be an easy fix.


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