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I have a 97 pontiac grand prix gtp 3800 supercharged series i knew my altenator was going out but my car died last week and now wont start back up it has a brand new battery in it had the starter tested and it is just fine had a million different suggestions as to what it was but dont have the money for trial and error

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  • Cars & Trucks Master
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The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.

Posted on Nov 05, 2012

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Posted on Jan 02, 2017

TheComforter
  • 18 Answers

SOURCE: 97 nissan sentra put new alternator and battery car wont start

are you sure the alternator is good? because it could be tricky ...The only other thing is the wire running back to battery pack to charge battery maybe disconnected

Posted on Jun 16, 2009

KCGTODAD
  • 169 Answers

SOURCE: my car starts but after a while dies waht can be

Hello! You're symptoms sound very much like a common problem associated with the fuel pump resistor. The GTP engine has a two speed fuel pump. There are two relays that control the fuel pump via the PCM module. The fuel pump relay and fuel pump hi-speed relay. Tied into the hi-speed relay is a fuel pump resistor that may go bad.

Symptoms vary but primarily the engine will start but die in a matter of seconds due to insufficient fuel pressure.

Here is a picture of the relay - which is located in the fuse box in the engine compartment:

e3ccead.jpg
What you can do to both diagnose this and either narrow it down to this or disqualify it as the culprit is remove relay #15, and bend out the tab labeled "85", and then reinstall the relay. If this does solve your problem, then you need to replace the Fuel Pump Resistor. Doing this will bypass the resistor, and place the fuel pump in "high" speed mode at all times. Once you have replaced the resistor, you need to bend the tab back to its normal position and replace the relay.
NOTE: while this may be a helpful diagnosis tool, and provide a temporary fix - doing this procedure for a prolonged period of time can lead to fuel pump failure. Use this at your own risk.


Hope this helps and good luck!

Posted on Sep 25, 2009

SOURCE: just R&R a motor in

To fix the high idle, replace the top oxygen sensor. I would drop the transmission pan and change the transmission filter. You can then check the old fluid for contamination and metal filings. Metal filings will clog the transmission filter and lead to low pressure that would cause delayed shifts

Posted on Jun 27, 2010

  • 383 Answers

SOURCE: I HAVE A PONTIAC GRAND

does it have spark ?
does it have fuel pressure?
does it have injector pulse?
check to see if you have fuel pressure if you have fuel pressure check spark if you ave spark check for injector pulse

Posted on Mar 05, 2011

  • 328 Answers

SOURCE: 2004 Pontiac grand prix gtp won't start- fully

it is the alternator brushes cheap and tanks little time to be replace and the brush who is clicking

Posted on May 27, 2011

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Known GTP problem.

You most likely have a bad fuel pump resistor, which controls 2 speeds of the fuel pump.

To check to see if this is the problem, there is a trick you can do and its very easy to do. Go to the attached link, and bend the tab my finger is pointing at and then plug it back in. If your car starts and runs fine, well we just solved the problem.

Link ->> http://www.boredandstupid.com/relay.jpg

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