Question about 1996 Chevrolet Tahoe
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Posted on Jan 02, 2017
It is not a fuel pump problem.
It a cold start valve problem. It didn't open. There are 2 things to check.
1- The cooling thermal sensor is not sending the proper signal to the ECU to turn on the cold start valve.
2- The bad solenoid inside the cold start valve causing it not operational.
Case 1 you can easily replace the thermal sensor.
Case 2 checking this requires professional skill to confirm if there is a signal at the valve during the start.
Posted on Aug 04, 2010
Ok PO 300 is A RANDOM MISFIRE meaning that mre than one (1) cylinder is misfiring and the computer cannot tell which ones. Ok having said that I used to own Ace Automotive in Lakewood Washington for 14 years i specialized in Diagnostics and Emissions. I Cured so many PO300 codes with the one thing that everyone overlooks. The fuel injectors, they are either shorted in which case you need to replace them, or in most cases dirty and mo amount of in the tank cleaners can do it. you need to have them professinally cleaned where the fuell pump is disabled and the truck is actually running on the chemical cleaner. We used to use BG products best stuff I ever seen brought many a car back to life I have used and seen the MOTOR VAC system a cannot say it compares to the BG system. Someone will need to determin if any injectors are shorted or dead and replace them and if thats the case just take em all out and have them ultrasonically cleaned they will give you a before flow report and an after cleaning report.
If this information is helpfl please give a good rating and by all means please visit my website and check out the BLOG AND FAQ read all the fuel injector problems .
Thanak you Randy
Posted on Aug 17, 2008
SOURCE: 2004 cavalier fuel problem?
Please call me its easier to explain on the phone, in the mean time try something easy hit the fuel pump on thebottom with a brick or rock then have someone listen to the fill neck of the tank for the two second "buzz" as soon as you turn on the ignition, has this vehicle been run way way low on fuel many times or the fuel filter neglected to been changed at the 15,000 miles interval?
call me or I can call you 253-691-6206
Posted on Aug 24, 2008
Check to see if the fuel pump is kicking in,
when you turn the key on without starting the van you should hear it kick on for about 2 seconds,
It could be...
A clogged fuel filter...
Blown fuse for the pump..or bad pump relay..
Bad fuel pump
Posted on Mar 07, 2009
Do you have the fuel tester hooked the in the overgrown air valve on the fuel rail in the back of the engine? Or do you have the fuel line unhooked in the back and hooked to the pressure pump? You want the fuel pressure to be in that 60 lb range so if you are hooked into the pressure valve on the fuel rail allowing fuel to go through, then I am betting it is the fuel pressure regulator. To get to that, you have to take the throttle body off and take the plastic plenum that covers the injector packs. On the back of the mount where your six pack of injectors are sits the pressure regulator. If it is faulty then it is dumping fuel instead of holding the pressure like it should.
Get a Chilton or Clymer manual and it shows you in pretty good detail how to fix it. I've done it to my 98 S10 with the same engine.
If you unhooked the fuel line so you are losing pressure from the line back to the pump then I would say your pump is letting fuel back to the tank when it shuts off. My money is on the first possibility though.
Posted on Mar 28, 2009
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