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truck turns over will not run

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New User

May 8, 2012, 6:35 AM

Post #1 of 2 (1645 views)
truck turns over will not run Sign In

i got a 2000 sonoma 2.2 mfi w/manual trans. i was driving it and felt like it jumped out of gear but died.engine rotates with no problem sounds norm. sounded like it was getting no fuel.i replaced the filter and getting 43 psi when pumps kicks on (when it is humming) and after a few seconds it shuts off and drops to 38 psi ( humming stops) all with in haynes specs. pulled plugs out checked each plug for spark and it was there. it rotates with starter but wont run. thought it might be out of time but dont know how to check it has no balancer or distributer so i am lost. pulled a plug sprayed eather in air intake turned motor over and smelled eather put plug back in. ps it has a little over a half tank of gas

Hammer Time
Ultimate Carjunky / Moderator
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May 8, 2012, 7:20 AM

Post #2 of 2 (1616 views)
Re: truck turns over will not run Sign In

 All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.

Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.

2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.

3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

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