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I have a 1997 GMC K1500 with the 5.0 and 215000 miles, the truck is in near perfect shape I've had it since new, never any major issues or problems till now..... It doesn't want to start, I have to pump the gas pedal, and one it is started this misses and won't idle until I give it gas for about 30 seconds. The check engine light comes on and off and at times on startup it flashes before becoming a solid light. It is rough and sluggish at take off from a stop but does gain power once moving. I have changed plugs, wires, air filter even exhaust, still having the issue. I pulled the most reward plug today on the drivers side and it was wet obviously flooded???????

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The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.

Posted on Oct 24, 2012


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Posted on Jan 02, 2017

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SOURCE: 2000 Nissan Sentra rough idle

a rough idle/high idle is indicative of a malfunctioning TPS(throttle position sensor) this is located on the throttle body ,is attached with (2) screws/bolts to the throttle body housing right off the butterfly shaft. it has either 2 wire or 4 wire plug. the replacement part can be purchased at locale auto parts store. I would also agree that a full service and tuneup be done. this will help with performance and will increase the fuel efficiency. please rate this...thanks

Posted on Sep 25, 2008

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SOURCE: One cylinder not firing

White smoke means blown head gasket.Have it checked.

Posted on Jan 23, 2009

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SOURCE: Rough idle after initial startup.

Really the sky is the limit here. See when you first start vehicle the computer is in open loop which means it is not monitoring the O2 sensors and fuel control is set to a calibrated setting. After the Heaters heat up the O2 sensors it then goes into closed loop and starts monitoring the O2 sensors to control air/fuel. So anything in the fuel and air mix could be causing your problem like false air volume reporting from the MAF sensor,a vacuum leak,unmeasured air getting into the engine behind the MAF sensor from a leaking hose,,a faulty pcv system,lazy O2 sensors, etc.
I would first recommend cleaning the MAF sensor and resetting the keep alive memory.Get a T20 torx bit and remove the MAF and get some electrical cleaner and spray the MAF bulbs clean then let it air dry or blow it dry with light shop air. Then disconnect battery for about 30 minutes to reset the strategies and see if this cures your problem. It will take probably 50 miles of driving for the strategies to reset.

Posted on Apr 15, 2009

  • 532 Answers

SOURCE: My 1996 Ford F150 4.9l 5spd. rough idle, poor drivability, stall

try replacing the throttle position sensor

Posted on Oct 24, 2009

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SOURCE: I have a 2005 chevy avalanche 1500 5.3L 327, i

The carbon on the spark plugs and black smoke coming out the tailpipe means you are running rich. (Too much fuel) this can becaused by anything from a bad Mass Airflow Sensor to a stuck injector to a leaking Fuel Pressure Regulator to a bad Upstream Oxygen sensor.

First, you need to check fault codes to see what the computer says the problem is. I would not be pouring injector cleaner in your vehicle unless you are absolutely certain the the cleaner you are using is going to be compatible with your fuel system. I've seen a lot of fuel system damage as a result of that.

In 2005 Chevrolet Avalanch had two different 5.3L engines one was flex fuel and the other was not.
The 8th digit in your VIN will tell you which engine you have. if it is a "T" it is standard gasoline and if it is "Z" it is a flex fuel engine.

There are several Technical Service Bulletins (TSB's) issued by GM for the fuel systems on BOTH of these engines. Depending on your engine type and the codes retrieved from the Engine Control Module, these TSB's may or may not apply to your problem.

Posted on Dec 02, 2010

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