1998 Pontiac Grand Prix car want stay running

Tiny
LARRY BARBER
  • MEMBER
  • 1998 PONTIAC GRAND PRIX
  • 105,132 MILES
When I crank my car it will only run for 4 to 6 seconds. If it does run longer when you press the accelerator it will die.I replaced fuel pump, fuel filter, fuel pressure regulator, cleaned injectors, cleaned the plenum an throttlebody replaced gaskets on both. Replaced the mass airflow sensor, the map sensor, idle air control valve, all three coils, sparkplugs&wires. So can you help me I'm desperate?
Do you
have the same problem?
Yes
No
Monday, September 2nd, 2013 AT 10:51 AM

8 Replies

Tiny
TY ANDERSON
  • EXPERT
Do you have an aftermarket alarm system installed? If not then check to see if a security light is coming on when the engine stalls? Are there any codes in the vehicle's computer?
The crankshaft sensors can cause different no start issues when they go bad. Talk to you soon, TY
Was this
answer
helpful?
Yes
No
Monday, September 2nd, 2013 AT 11:03 AM
Tiny
LARRY BARBER
  • MEMBER
Only sensors came up was idle air control an map sensor I have replaced them both
Was this
answer
helpful?
Yes
No
Monday, September 2nd, 2013 AT 11:13 AM
Tiny
LARRY BARBER
  • MEMBER
An no alarm system
Was this
answer
helpful?
Yes
No
Monday, September 2nd, 2013 AT 11:31 AM
Tiny
TY ANDERSON
  • EXPERT
For no start conditions you need to rule out some systems. I would check for spark. Get a spark tester from any automotive tool supplier and test or you could use a screw driver inserted into the spark plug boot and held close to the engine with someone trying to start the engine (**Take care to get electrocuted if using a screw driver). Crank the engine for about 15 sec and make sure your getting spark consistently through out those 15 sec.
If the ignition systems if proving out good
Next, check for fuel pressure with a fuel pressure gauge. 3.1l engine fuel pressure 41-47 psi 3.8l engine fuel pressure is 48-55psi. If this is good, next you'll test for engine timing and then compression. Hope this helps and good luck. If you have any questions let me know, Ty
Was this
answer
helpful?
Yes
No
Wednesday, September 4th, 2013 AT 9:14 PM
Tiny
LARRY BARBER
  • MEMBER
What's up ty I found my problem its thee evap system. What I want to know without replacing the evap canister an the the rubber lines an the purge valve is there away to bypass this system?Thanks ty
Was this
answer
helpful?
Yes
No
Saturday, September 7th, 2013 AT 8:23 PM
Tiny
TY ANDERSON
  • EXPERT
If you want to rule out an open purge valve (causing a large vacuum leak) just disconnect the pipe connected to the intake and plug the hole preventing any vacuum leaks. This purge line is the only thing that can cause a no start every thing else the "EVAP" system shouldn't cause a not start condition just increased emissions.
Tampering or bypassing emission components I believe is a federal offense. But for testing it should be ok just as long the emission components are brought back to original working order.
Hope this helps, TY
Was this
answer
helpful?
Yes
No
Monday, September 9th, 2013 AT 5:47 PM
Tiny
LARRY BARBER
  • MEMBER
Thank you ty an everyone at 2carpros.I will be telling all my friends an family about this site.
Was this
answer
helpful?
Yes
No
Tuesday, September 10th, 2013 AT 6:23 PM
Tiny
TY ANDERSON
  • EXPERT
Your welcome happy to help!
Was this
answer
helpful?
Yes
No
Thursday, September 12th, 2013 AT 7:48 PM

Please login or register to post a reply.

Related Engine Stall While Driving Content

Recommended Guides