Question about 2005 Chevrolet Silverado

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Chevy V8, 5.3L, 4wd, engine missing between 48 and

05 Chevy V8, 5.3L, 4wd, engine missing between 48 and 60 regardless of load. Just started it. Engine starts and idles fine. Runs ok at low speeds. No check engine light. Poor gas mileage. 14 in town and 17 on road, was about 17 in town and 20 on road. 85000 on engine, mostly road miles.

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Based on what you say here i suspect maybe theres an open in the tps. you can test it with an ohmeter if you have one. some scanners will even show what its doing.

Posted on Feb 24, 2018

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Posted on Jan 02, 2017

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Anonymous

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SOURCE: gas mileage decreased

cmon 114k miles is nothing on a toyota even if u abuse it dude

Posted on Jun 09, 2009

Bernie Goncalves

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SOURCE: 2004 Toyota Camry 4 cyl automatic. What mileage 85000

80 thousand miles is the best, any more you are risking damage to your engine.

Posted on Jan 26, 2010

Testimonial: "Fast answer. Thanks"

Anonymous

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SOURCE: Poor gas mileage 2000 S10 4.3L 4WD

I disagree with changing the MAF sensor. I had the same problem for about 4 years until today on my 2000 s10 4.3 4wd 125K. It runs like new, and all i did was paid 6 bucks for a can of mass air flow sensor cleaner from auto zone. Try this!! it was awesome the results

Posted on Jun 24, 2010

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I have a 2009 Chevy Silverado 1500 2wd pickup. The check engine light along with the service stabilitrak and traction control lights also came on. It runs rough at idle or low speed. Where do I start?


Have it check for DTC'S - diagnostic trouble codes . If the check engine light starts flashing , park it . The flashing check engine light is telling you there is a catalytic converter damaging miss fire happening . An they can be damaged very easy .

May 17, 2017 | Cars & Trucks

1 Answer

Engine misses/hesitates on low speeds. Runs fine


is the check engine light on? have you ever serviced the injectors? if not try that first because there are many things that give the symptoms you spoke of. but this is the cheapest.
vbninja E.A.P

Jul 23, 2010 | 2005 Cadillac CTS

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1998 dodge ram pickup 318 eng. engine idle rough on warm-up engine idle rough after warm-up shutting off engine and starting back up engine also runs sluggish in over drive at a low idle. I have...


If the engine seems to run fine over 1450 RPM maybe there is a vacuum hose leaking or EGR valve is slightly stuck open. Any help from the OBD II trouble codes? Or is there simply no MIL and no stored information in the OBD II computer read at the local parts store through the connector by the drivers knee?

Dec 04, 2009 | 1998 Dodge Ram 1500 4WD

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My 2006 tdi idling speed is constant but sometimes


when you turn on the a/c the ecm increases engine fuel to compensate for extra load could possibly be a vacuum leak

Oct 15, 2009 | 2005 Volkswagen Jetta

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When engine is cold it starts right up but then has a miss !


is your check engine light on? check your O2 sensors

Jun 02, 2009 | 1998 Jeep Grand Cherokee

1 Answer

Idle is too low, car dies, engine runs fine


An IAC (idle air control) motor is designed to adjust the engine idle RPM speed by opening and closing an air bypass passage inside the throttle body. The car computer or ECM (electronic control module) receives information from various sensors and will output signals to adjust the IAC motor in or out to adjust engine idle speed by controlling engine idle air.
An IAC motor is highly susceptible to carbon and coking build up; if an IAC goes too long without cleaning it can cause stalling and poor idle quality. Some cars are designed with a large vacuum transfer hose that connects the intake manifold to the IAC (idle air control) motor. If a broken or dilapidated these vacuum lines can cause the engine to lose vacuum which will allow the engine to run rough and die. 
Inspect all engine and accessory vacuum lines to look for missing, torn or dilapidated lines and replace as needed. To check the IAC motor remove the unit, with the wires connected turn the key to the "on" position without starting the engine, the IAC should move in or out. 
If the IAC motor does nothing it has probably failed, replace it with a new unit and recheck system. Note: while the IAC motor is removed clean (use aerosol carburetor cleaner) the passages the IAC uses to control idle air speed.

Good luck and hope this helps

May 08, 2009 | Honda CR-V Cars & Trucks

1 Answer

4.3 Liter V-6 Idles rough when in gear, runs fine on highway.


Can you check fuel trims at idle and under load?
If fuel trim is high at low speed and load, look for a vacuum leak.
If fuel trim is high at high speed and loads, look for fuel volumn problem or restriction.
If fuel trim is high at all speeds and loads look for pcm input fault, maybe a maf sensor problem?
If fuel trim is negative low speed and load, look for fuel pressure regulator or injector leak. If fuel trim is negative at all speeds and loads check ect and iac.

If you have the spider fuel system, that system is noted for problems. key on engine off, 60--66 psi fuel pressure.

Mar 06, 2017 | 1999 Chevrolet Silverado 1500

1 Answer

Engine idling varies depending on light or aircon is on/off


dude its normal for first start or cold start that the idle is ok but it must high than normal... its normal because the engine is warming up it self... when it gets warm, the idle speed will return normal idle... your engine is 1200cc, it has not much HP for a great load... and i know its a carburatored engine and its an old engine, your head lyt and a/c fan and aux fan and all the electrical system on your car, uses the HP of you engine and its a lot of load to the alternator driven by the engine to generate an electricity they need and thats why the engine rpm speed lowering down to dead and its shake. thats why when you use your lyts or all electrical, you engine is weakening... the best remede is adjusting you idle speed... its located behind the carburator.. its a small black knob.. just make a twist each eighter way and you'll find out if your idle rpm speed ts incresing or decresing.. just increase it and try opening your lyts and other electrical, if its still shaking then adjust it a little more

Aug 26, 2008 | 1994 Honda Civic

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