Question about 2004 Chevrolet TrailBlazer

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Engine has hesitation/miss without a check engine light coming on upon acceleration

Engine has miss/hesitation at idle and at accelaration

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  • 332 Answers

There are many things that could cause that from bad gas to weak fuel pump or dirty inline filter or timing chain could be weak or dirty intake or bad catalitic converter or no converter or even a vaccum line off or cracked or even a bad EGR valve so you see theres alot of things that cause poor exceleration or idle. Hope this was some what helpfull.

Posted on Feb 01, 2013

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6ya6ya
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Posted on Jan 02, 2017

diths_kri
  • 67 Answers

SOURCE: 1986 chevrolet silverado truck engine hesitates when accelarating

Along with the vacuume leaks I would check the carb. The accelerator pump might be out of adjustment or something else in the carb. Currently I have the same problem with mine and I just adjusted it and for 1 day so far it's ran fine but I have a holley on mine. Carb may be dirty also.

Posted on Jan 07, 2009

  • 1 Answer

SOURCE: 2003 Silverado rough idle, idles good after "check engine" light

Check your o2 sensor voltage, those trucks are real bad for o2 sensors, and yes if one sensor is reading 0mv, the others will start to drop out, and the vehicle will run very, rough. You also may check fuel system pressure, should be almost 60p.s.i. If its alot lower, Id be looking into a fuel pump. If that vehicle is drive-by-wire (no throttle cable), the throttle bodies get very dirty and cause that concern also. Id start by having the vehicle scantested.

Posted on Feb 07, 2009

  • 1 Answer

SOURCE: 1989 Cavalier Z24 3.1 rough idle and hesitation

I had the same problem with my Z when i had it. But it worked when i just left the little hose off of the EGR valve.

Posted on Jun 13, 2009

  • 1146 Answers

SOURCE: Check engine light is on, not good acceloration

Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. The computer detects that the actual MAF sensor frequency signal is not within a predetermined range of the calculated MAF value for more than 4.0 seconds.
You will likely not notice any serious drivability problems, although there may be symptoms.
The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures:

  • Inspect for the following conditions:
    An incorrectly routed harness--Inspect the harness of the MAF sensor in order to verify that it is not routed too close to the following components:
    - The secondary ignition wires or coils
    - Any solenoids
    - Any relays
    - Any motors
  • A low minimum air rate through the sensor bore may cause this DTC to set at idle or during deceleration. Inspect for any vacuum leaks downstream of the MAF sensor.
  • A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor g/s display on the scan tool to increase rapidly. This increase should be from 6-12 g/s at idle to 230 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system.
  • When the engine is running the MAP sensor value is continually updated near WOT. A skewed MAP sensor will cause the calculated MAF value to be inaccurate. The value shown for the MAP sensor display varies with the altitude. With the ignition ON and the engine OFF, 103 kPa is the approximate value near sea level. This value will decrease by approximately 3 kPa for every 305 meters (1,000 feet) of altitude.
  • A high resistance on the ground circuit of the MAP sensor can cause this DTC to set.
  • Any loss of vacuum to the MAP sensor can cause this DTC to set.

Posted on Nov 17, 2009

  • 5 Answers

SOURCE: 1998 Chevrolet 5.7 Vortec Problems.

Most likely the intake gaskets are bad. they will sag in the middle over time and allow a vacuum leak between the head and intake. recommend replacing the gaskets with the steel instead of plastic ones.

Posted on Mar 01, 2010

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