Question about Pontiac Grand Prix

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Only runs full throttle

Start the car and its full throttle. ive changed the tps and other sensors.. sprayed the motor for vac leak. nothing.. now im stuck and dont know where to go from here.. the car just wants to max out and run as fast as it will go.

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  • Pontiac Master
  • 5,252 Answers

Disconnect the MAF sensor and see if it changes rpm's. Pull off the big boot at the intake. Is the throttle valve wide open? If it is, the throttle body assembly needs cleaning-maybe it is stuck?
Have you scanned for trouble codes?

Posted on Jul 23, 2013

Testimonial: "the codes it threw were tps and 2 evac codes. im pretty sure its not stuck. "

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 321 Answers

SOURCE: buick lesabre nightmare

Need to get a scan tool and look at the data stream while it is running for alot more info.Also any trouble codes.Sounds like initially,the engine isn't getting any fuel.I would have a pressure gauge connected to the fuel rail on the engine,so i could monitor the fuel pressure while all this is going on.Items to look at on the data stream would be timing,what timing is the PCM commanding for the engine.Also,have you checked for continuos power feed to the coils during this no start condition,and fire at the plugs while cranking.You could possibly still have spark,but maybe it is extremely weak?I have seen bad ignition switches cause weird problems before too.Many things power up through the ignition switch,just a thought.Have also seen bad PCM's cause strange problems..38 volts is a little on the low side for GM.Usually see those at,at least .50 and up,and rise steadily while pressing the throttle,up to just under 5.0 volts.Potentiometer with 5 volt supply.Vacuum leak can be checked with engine running at a steady idle speed,spray brake cleaner all around the intake manifold and listen for engine speed change.

Posted on Jul 31, 2008

  • 255 Answers

SOURCE: buick lesabre no start

Hi you have replaced allmost everything ,(try fuel pump relay)

Posted on Aug 18, 2008

  • 2 Answers

SOURCE: my corolla 2000 1.8 dont respond well when i push the accelerator

its a dirty injector

Posted on Apr 15, 2009

  • 74 Answers

SOURCE: full throttle all the time

We actually have a TSB for the drive by wire systems that calls for both a TPS sensor/actuator replacement but it's required that you also do a PCM reflash at the same time. If you put in the new updated part without doing your reflash then you've found your problem.

Take it to the dealer and get the reflash done.

Posted on Nov 23, 2009

csmock132
  • 4669 Answers

SOURCE: 84 Fiero. trouble starting and runs rough and the surges/stalls

It sounds like a fuel pump. Check the fuel pressure. What size engine?

Posted on Aug 01, 2010

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Always start with the simple stuff.. look for vacuum leaks. look at accel cable attached to the throttle body.. is it stuck holding the throttle plate open? The big Vac hose from the intake manifold to the brake booster? . remove the big air hose from the airfilter to the throttle body check the throttle plate.. and clean the mass air.. special spray cleaner at auto parts store. Did this just happen or did you change something.. DID YOU INSTALL THE TPS WITH THE HOSE ON AND COULD NOT SEE THE THROTTLE PLATE POSITION?.

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That could be anything from-----simply spraying the throttle
plate with CRC Throttle Body Cleaner,to Coil misfires ,coming
back on your TPS Sensor and setting your codes,to a bad
APP Sensor (accelerator pedal position sensor) to worse
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Spray the throttle plate and let me know if you have other
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I hope you do not, still have 4 or 5 year old spark plugs
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Start doing this work yourself. You can not afford a thousand
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Something is probably leaning out the mixture when you open the throttle. It seems that any ignition issues have been ruled out.

So, check the following: fuel filter clogged, low fuel pump pressure, the fuel pressure regulator could be stuck at the idle setting, the EGR valve could be stuck open, faulty throttle position sensor (TPS) or circuit, faulty manifold absolute pressure (MAP) sensor, faulty or dirty manifold air flow (MAF) sensor, faulty intake air temperature (IAT) sensor, and an air leak into the intake duct or manifold between the MAF and the throttle body. I think if the intake manifold gasket had a leak, it would be misfiring at idle.

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the one thing i use is carburetor cleaner ,spray it at the vacuum lines and the throttle body plate as you do it you will see a change in idle if you spray the bad leak area.but if the leak is that loud it could be coming from the brake booster line or brake booster itself.hope this helps you.

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