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The throttle body of my chevy has 40 psi fuel and the mechanic says that is the reason for the engine misfire is this true. He also says that the proper psi should be around 15 psi.

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The regulated fuel pressure is between 38 - 44 psi. Misfire can occur due to:
- Ignition system, (ignition coil, spark plugs, ignition timing, cam sensor, crankshaft position sensor)
- Fuel system.
- Vacuum leak.
- Worn out throttle body.
- Weak engine compression.

Posted on Dec 28, 2013


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Posted on Jan 02, 2017

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SOURCE: wont start

Make sure that you're getting spark. A very common thing on these engines are coils going bad. If you can verify spark, check to make sure you have an injector pulse. As you rotate the engine, look inside of the throttle body and make sure that you see fuel pulsing into the engine. You can still have good pressure but you don't have an injector pulse, the fuel still cant get into the engine. You can use a test light as well to test for an injector pulse. One wire going to the injector will have constant power and the other will blink when the engie is rolled over. Does it start if you spray starting fluid into the throttle body? If it does, it's a fuel delivery problem. Again be sure you have spark from coil to distributor and plugs. You can remove the ignition module and take it to NAPA and they have a module tester. Have them test the module several times not just once. This will eliminate the possibilites of an intermitted problem. Let me know how it does.

Posted on Aug 21, 2008

  • 80339 Answers

SOURCE: 1997 Eagle Talon TSI AWD oil pressure goes from zero to normal and back

Te 1st thing to do is replace the oil pressure guage sending unit, most times that is the problem, if press remains low use a mechanical test guage to verify what the oil pressure is, hook this tester up at the port the sending unit is screwed into.

Posted on Oct 29, 2008

  • 80339 Answers

SOURCE: 2002 audi a4 oil pressure light issue


Posted on Feb 14, 2009

  • 93 Answers

SOURCE: Chevy 454 back fire

Ignition timing is set by the computer as long as the distributor pickup point is within reason.

It could be running too lean. One of the TBI injectors may be sticking or not working (wiring or computer problem), or fuel pressure could be low.

Posted on May 21, 2009

  • 45 Answers

SOURCE: Where is the Fuel Pressure Regulator on a 1996

on the fuel injector line

Posted on Jun 30, 2009

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but here are the reasons, (not the 50 causes) all the below are tests.
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fuel pressure.
fuel regulation test.
shut test
injector leak down test.
and the injector balance test.
we do them all, or fail;.
all this is FSM.

do you want us to guess or test?
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