Question about 1997 GMC Sonoma

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97 gmc sonoma 4.3 wont start changed the the injector and pressure regulator still wont start

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  • GMC Master
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Have you checked the fuel pressure at the injectors ?
Are the plugs getting spark ?

Posted on Jan 14, 2013

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Posted on Jan 02, 2017

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johnjohn2
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SOURCE: starts fine cold then starts

The computer runs the fuel mixture rich when cold and then leans out as it warms up into closed loop, a common problem is the regulator leaking, if you remove the upper part of the intake and then turn key on and watch for fuel leaks, another trick is to remove the throtlebody and use a light to see if fuel is puddling up on the top of the intake, make sure to dissconnect module connectors to avoid a false start or spark that will cause a fire, i would almost bet its the regulator, hope this helps,

Posted on Dec 07, 2010

  • 5 Answers

SOURCE: no fuel pressure on 94 gmc sonoma s10. replaced

Try changing the fuel lines, if they are cloged from debris that could be the cause.

Posted on Nov 07, 2009

  • 159 Answers

SOURCE: how do i chang the fuel pressure regulator .

Should be attached to the fuel rail. The fuel rail connects all of the fuel injectors. The regulator will have a vacuum line on it.

Posted on Dec 09, 2009

Testimonial: "thanks for the help and it fixed the problem."

ginko
  • 19396 Answers

SOURCE: MY 1999 SONOMA WONT START

Re:"truck try to start but,look like not caching all cylinders cause while crank, if i puhs acelerator to the floor then try to start i remove plugs they, are wet i clean then reinstall,"

If you are saying that the cylinders are flooding and there is misfire, check the coil packs. This get tested reading Ohms on primary and secondary coils, reading volts in. Ohms on primary coil terminal (B+) must be in range of 0.3-1Ohms, secondary resistance reads between 5K and 15K. There are different kind of coil packs for this engine. Their ratio is always about 90:1, to return 45K Volts. On this one impedances should be 0.2 ohm primary resistance; 6.7 KOhms secondary resistance.

Other way to test coil packs is swapping the two packs in this engine (not swapping spark cables, swapping the modules).

Also do a code scan. If there is misfire this is reported as P03xx OBDII code.
Reading codes you can also find out if there is any rich or lean code detected by the O2 sensor. If car is not starting at all there will be no mixture code reported from O2 sensors, as there is no ignition.

Regarding mixture, if ignition and distribution is OK, check the factors that determine mixture. Check MAP/MAF sensor and IAT sensor. Test starting with new air filter , test with no fuel cap and check the vacuum. If vacuum has a hole it will **** air in the mixture, mixture will be lean, you have pressure but the engine does not ignite even if there is spark.
To test vacuum use the fuel gauge in vacuum lines and spray carb cleaner on hoses, if there is a hole pressure will go up.

If still nothing check and eventually replace the AC delco EGR valve. Valve stuck open is a common failure, car will not start, engine will flood. In that case the mixture is rich.

PS:Please stop telling everybody "if you dont know dont answer" There are two kind of answers, the ones from people who does not have a clue and go for the few bucks, and the one from people that may help you. There is no way to filter them. Most of the answers are from experts but some idio t is also posting. Simply discard the bad ones and stick to the good ones.
You should stick with an expert and keep troubleshooting, not keep arguing.

I know you are discarding everything, and probably going for r., but who cares. I am out of here.

All the best, good luck with your GM engine.

G.

Posted on Sep 16, 2010

elkoolarrow
  • 156 Answers

SOURCE: my 1998 gmc sonoma wont start when cold. fuel

A VERY COMMON CAUSE OF THAT IS THE ENGINE COOLANT TEMPERATURE SENSOR, YOU WILL NEED TO VERIFY PROPER OPERATION WITH A LIVE DATA SCANNER, BEFORE U TURN IT ON IN MORNINGS OR COLD, COLD ENGINE LOOK FOR CTS READING IT MAY READ -40 DEGREES, IF SO THEN SENSOR IS MALFUNCTIONING, BUT WILL NOT SET A "SERVICE ENGINE SOON" LAMP WARNING. OTHER WAY TO CHECK IS TO DISCONNECT SENSOR, I AM ASSUMING THAT WEATHER IS ABOVE 20 DEGREES. LET ME KNOW IF THIS HELPS, CAN ASSIST YOU FURTHER WITH UPDATES

Posted on Mar 03, 2011

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1 Answer

Truck wont start


Make sure to bleed any air out of the fuel rail using the schrader valve on the fuel line. This should solve the problem if not the injectors may be clogged or faulty and should be replaced. It may also be the fuel pressure regulator. Hope this helps.

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You would check for spark at the plugs and the fuel pressure at the injectors. There should be a port on the fuel rail where you connect a fuel pressure gauge.
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1996 gmc sonoma fuel volume regulator


The fuel pressure regulator is located INSIDE the intake manifold. If you are going through the work of replacing it, i strongly suggest replacing the injectors. An updated injector setup is available as the originals were very problematic.

Feb 02, 2013 | 1996 GMC Sonoma

1 Answer

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install pressure gauge and watch when key is turned off to see if pressure drops to zero if so bad drain back valve in fuel pump replace it or deal with it or could be cheap aftermarket pump and has hard time building unnecessary pressure to open poppet valves between before fuel injectors

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1 Answer

Starts fine cold then starts and shuts off then starts very hard but will start . could this be fuel pressure regulator what what happens to make for lean air fuel mix during cold start in 80's had a cold...


The computer runs the fuel mixture rich when cold and then leans out as it warms up into closed loop, a common problem is the regulator leaking, if you remove the upper part of the intake and then turn key on and watch for fuel leaks, another trick is to remove the throtlebody and use a light to see if fuel is puddling up on the top of the intake, make sure to dissconnect module connectors to avoid a false start or spark that will cause a fire, i would almost bet its the regulator, hope this helps,

Dec 07, 2010 | 1997 GMC Sonoma

1 Answer

My 2001 GMC Sonoma is idling rough, starts hard but when accelerates sounds good. I have replaced the fuel pump, fuel filter, and now all the plugs and wires, but still rough?


Check for vacumn leaks ! Idle air compensator? clean throttle valve oppenings and air port opening,do you have check engine lite on,check EGR valve? Dirty fuel injectors ,bad pressure regulator?Check fuel pressure at fuel rail,at idle !

Sep 06, 2010 | 2001 GMC Sonoma Extended Cab

1 Answer

02 gmc sonoma 4.3 engine starts and runs great for 30 minutes and then stalls like its flooded, if it sets after stalling for 30 minutes and cools able to drive home before starting to stall again. After...


Smell of the oil,to see if the fuel injector(spider)is leaking into the crank case,if so,the intake will have to be removed to repair the problem,oh,and change the oil.

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1 Answer

How do i chang the fuel pressure regulator its not behind the fuel meter body is it under the intake? on a 2002 gmc sonoma ex cab.


Should be attached to the fuel rail. The fuel rail connects all of the fuel injectors. The regulator will have a vacuum line on it.

Dec 09, 2009 | 2002 GMC Sonoma Extended Cab

2 Answers

Truck won't stay running


Check the fuel pressure at the Shredder Valve, You should have 60PSI to 65PSI upon start and should drop about 5PSI when running. If your fuel pressure is good then it may be a bad injector system. The fuel injector spider system that the vortec has are know to go bad, from the fuel pressure regulator to the puppet fuel valves. Change the fuel filter first if it has not been changed yet and have the fuel pressure check. Good luck and keep me posed. Note: it's been know that spraying ether to start the vortec with the spider injector system has got the puppet valves to catch fire and melt the ends of the puppet valve leading to the replacement to the whole system. Good luck and keep me posted, be glad to help.

Jun 14, 2009 | 1996 GMC Sonoma

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