Question about 2004 Chevrolet TrailBlazer

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Had oil changed ,injectors cleaned and air filter replaced Now the speedometer reads 30 instead of 0 at idle

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Remove the pos.battery cable for 10 seconds to reset the computer ,try that to see if it works ,most time the computer will give a code so ,go to autozone for a free computer check, hope to help you, robert b.

Posted on Jul 17, 2009


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Posted on Jan 02, 2017


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2000 hyundai lantra sportswagon running rough, idling rough also, when accelerating splutters/spurges. Thinking maybe spark plugs or timing belt??

Needs a tune up. Adjust engine timing, replace plugs and plug wires, replace air filter, oil and oil filter, fuel filter and clean fuel injectors, adjust valves.

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I have a Isuzu Bighorn 4jx1 but is hard starting. When it crank the engine on but bit not pick up speed or it it starts like it was out of fuel. Can you advice on what to do? Hear from you the...

try slightly over filling oil level if engine starts and runs for a minute or two then dies the oil pick up in sump has fallen out (cracked mounting bracket) or sucking air instead of oil. you can remove small tin engine sump after draining to check oil pick ups, after confirming it runs ok for a little while once over filling oil level in engine.
another thing that goes is the rail oil pressure sensor which reads incorrectly and a tell tale sign this is broken is the injector loom connector is full of engine oil when disconnected this is near engine oil level dip stick(wiring loom comming out of rocker cover), the sensors reading can be checked with scan tool before starting with ignition on, (0-0.2MPA) it must read if its reading higher with ignition on only (motor not running) the sensor needs replacing, the engine ECU needs to see approx 200MPA when cranking to get injectors to start to work properly and higher when running at idle and beond (up to about 5MPA at higher revs) if this is not getting to this or readings are fluctuating badly indicating air in oil the injectors wont supply the correct amount of diesel. in which the engine oil comming from low pressure (pickup pump) to then high pressure oil pump to rail and injectors.

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1999 Expedition - when in idle the speedometer and RPM needles occasionally go wild... any advise_

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