Question about 2006 Buick Grand National

6 Answers

I HAVE AN 86 T-TYPE, IT LOSES POWER AS SOON AS YOU BRING IN BOOST PRESURE,OTHERWISE IT WORKS FINE. I ALSO NOTICE BLACK SMOKE AT THE EXHAUST WHEN THE PROBLEM OCCURES. SEEMS I'M GETTING TO MUCH FUEL AND NOT ENOUGH AIR. I KNEW THE TURBO WAS GETTING TIRED SO I HAD IT REBUILT. ALSO CHANGED THE MASS AIR FLOW SENSOR, INSTALLED A K&N FILTER. MY NEXT STEP IS CHECKING THE CAT. CONVERTOR, AN AFTERMARKET WAS INSTALLED YEARS AGO. A CODE 42 (RICH OX SENSOR) AND 51 (FAULTY ECM) HAVE BEEN STORED. BUT A THINK THEY'VE BEEN TRIGGERED BY THE RICH CONDITION. I ALSO SWITCHED THE ECM WITH ANOTHER I HAVE SAME THING. IF I DRIVE THE CAR WITHOUT HARD ACCELLERATION NO CODES ARE STORED. ANY IMPUT WOULD BE APPRICIATED THANKS! MIKE.

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  • 5 more comments 
  • mightylift Sep 08, 2010

    THANKS MAN! I WILL START WITH THE EGR AND LET YOU KNOW HOW IT GOES.

  • mightylift Sep 09, 2010

    CODE 42 (RICH OX SENSOR) CODE 51 (FAULTY ECM, PROM OR CALPACK)

  • mightylift Sep 09, 2010

    I INSTALLED ANOTHER ECM WITH A DIFFERENT PROM, DID'NT HELP. SOMEONE ELSE SUDGESTED THE EGR VALVE. GONNA TRY AND CLEAN IT. SOMETIMES THE ECM WILL STORE CODES BECAUSE OF ABNORMAL EMMISIONS.

  • mightylift Sep 09, 2010

    MAYBE BUT THE ENGINE RUNS FINE AT ANYTHING UNDER HALF THROTLE, AS SOON AS THE BOOST COMES IN, THAT WHEN THE LOSS OF POWER STARTS.

  • mightylift Sep 09, 2010

    I DON'T THINK SO. THANKS FOR YOUR IMPUT THOUGH. ANYTHING ELSE YOU CAN THINK OF?

  • mightylift Sep 09, 2010

    THE VACUME TEST IS A GOOD IDEA, BUT AS NOTED IN MY POST THE TURBO IS NEW. THATS THE FIRST TING I REPLACED. I'M GETTING THE FEELING, EITHER ALL OF MY POST IS'NT THERE OR ITS NOT BEING READ. COULD YOU LET ME KNOW WHAT YOU SEE. THANKS FOR YOUR HELP! MIKE.

  • mightylift Sep 09, 2010

    I REMOVED THE EGR TODAY, INSPECTED IT AND THE INTAKE, BOTH LOOKED REALLY CLEAN, THE DIAPHRAM IN THE EGR IS WORKING FINE. I CLEANED EVERYTHING UP AND REINSTALLED THE EGR. I REALLY DON'T THINK THE EGR IS SUSPECT. MUST BE SOMETHING ELSE. THE TURBO IS NEW.

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6 Answers

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  • Buick Master
  • 14,036 Answers

A BAD OXYGEN SENSOR WILL CAUSE RICH FUEL MIXTURE IN WHICH WILL KEEP CAR IN OPEN LOOP.IF YOU TRADE ECM MAKE SURE ITS NEW AND SERIAL NUMBER MATCH IF YOU STILL GETTING CODE 51 THAT WILL CAUSE VECHICLE TO GO IN LIMP MODE.IT WILL RUN RICH AND NOT HAVE NO POWER.

Posted on Sep 10, 2010

  • Jonah Oneal Sep 20, 2010

    CODE 42 IS SET WHEN THE HEI MODULE GETTING NO VOLTAGE IN THE BYPASS LINE, THE HEI MODULE GROUNDS THE EST SIGNAL.THE ECM EXPECTS TO SENSE NO VOLTAGE ON THE EST LINE DURING THIS CONDITIONS. IF IT SENSES VOLTAGE IT SETS CODE 42 AND WILL NOT GO INTO THE EST MODE.YOU COULD HAVE BAD IGNITION MODULE.

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  • Master
  • 2,272 Answers

Try with another EGR valve.make sure you don't have any vacuum leaks. Also check all the boost hoses.Also check the boost pressure regulator,if there is loss of pressure then it can be the issue.Get the boost pressure checked at any local car garage,this will help. Thanks. Keep updated for any more query. You can rate this solution and show your appreciation

Posted on Sep 09, 2010

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  • Master
  • 560 Answers

Check your engine's vacuum ports , hoses , and valves . I would recommend hooking up a vacuum gauge . Use a T. connector to connect it to a good (larger diameter) manifold vacuum source . Then , take it for a drive and load it enough to activate the boost mode . Also , check the boost gate valve that opens the exhaust to power the turbo. I worked on one last year and spent two days on it for a customer and it turned out to be a faulty valve in the upstream to the turbo . It sounds as if you're just not getting enough pressure from the turbo . The black smoke means you're getting the extra fuel but you're not getting the extra air to burn it.

Posted on Sep 09, 2010

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  • Master
  • 2,926 Answers

Is it possible the cold start valve is leaking, causing extra fuel to constantly enter the intake system? Just a thought.

Posted on Sep 09, 2010

  • GetMeOttaHere Sep 09, 2010

    Does this vehicle have a cold start valve? I'm thinking it does from memory.

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  • Buick Master
  • 75,117 Answers

Do u have any electronic engine control fault codes, below is a diagram of what pins u jumper under the dash at the diagnostic connector in front of driver.

I HAVE AN 86 T-TYPE, - b43999a.jpg

Posted on Sep 09, 2010

  • 1 more comment 
  • yadayada
    yadayada Sep 09, 2010

    code 51 is the problem do the research on that.

  • yadayada
    yadayada Sep 09, 2010

    replace the PROM inside the computer and u will solve the problem

  • yadayada
    yadayada Sep 09, 2010

    the only codes that will store from rich or lean running are the O2 sensor codes, not anything else, what someone said other wise? been doing this 35 years, if the EGR was at fault it would not idle, to do a test just put a blocking gasket under the valve made from a coke can, it takes the EGR out of the circuit. another thing to consider is the turbo has a bad oil seal and the puff of smoke is oil being burned as the boost goes up.

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  • Buick Master
  • 17,970 Answers

When you have black smoke and loss of power, the first and cheapest thing to check is the EGR valve. Pull it and inspect it.

Keep in mind that, black smoke is always some type of overfuel condition. The two major things that will cause that would be Turbo or EGR.

In the case of the Turbo it could be sticking vains or a failed VGT or the VGT connector. Iin the case of EGR, remove valve and have a look in the intake. If you see black rocks its time to remove and clean the Intake and EGR valve.

Hope helps.

Posted on Sep 08, 2010

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